A car mass 1000kg is travelling along a straight horizontal road at a speed of 20m/s when it brakes sharply then skids. Friction brings the car to rest. If the friction force between the tires and road is 9000N. Calculate the distance travelled by car befor it comes to rest 211m a O 1.11m bO 25.5m 22.22m.
Answers
The distance travelled by car before it comes to rest is 22.22m.
When the car brakes sharply and starts to skid, the friction between the tires and road causes the car to come to rest. The friction force between the tires and road is given to be 9000N. The mass of the car is 1000kg and its initial speed is 20m/s. We need to calculate the distance travelled by the car before it comes to rest. Using the formula v² = u² + 2as where, v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance, we can calculate the distance travelled by the car before it comes to rest. Since the final velocity is 0 (the car comes to rest), we can write the equation as 20² = 0² + 2(9000/1000) s Simplifying this equation, we get s = 22.22m. Therefore, the distance travelled by the car before it comes to rest is 22.22m.
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Related Questions
Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells?
Burning fossil fuels contributes to climate change.
Burning fossil fuels takes place inside expensive fuel cells.
Fossil fuels aren’t widely available, but pure hydrogen is.
Fossil fuels are nonrenewable.
Answers
Answer:
Burning fossil fuels contributes to climate change.
Fossil fuels are nonrenewable.
Explanation:
Fossil fuels are fuels formed from the remains of dead organic matters that have long been buried under the ground while hydrogen fuel cells are formed from electrochemical reactions.
Fossil fuel burning creates pollution in the environment and some of the pollutants generated contribute to global warming and associated climate change. This is as opposed to fuel cells that generate power through electrochemical reactions and whose products can be converted for other uses.
Also, fossil fuel deposits are finite and non-renewable. Once their deposits become exhausted, there is no way to artificially regenerate them unlike fuel cells.
Answer:
i hope this helps
Explanation:
alcohol,monosodium glutamate (vetsin), water, fruit extract,sugar, coffe powder, salt, cow's milk, cocoa powder, liquid detergent. solute or both or solvent
Answers
Answer: solute: sugar, coffee powder, salt, cocoa powder, liquid detergent, monosodium glutamate (vetsin).
solvent: cow's milk, water, fruit extract
Explanation:
A solution is a mixture that is made up of two or more substances including solute and solvent.
The solute is one which can be dissolved in a liquid part that is solvent. The solute can be liquid or solid. Solutes are sugar, salt, coffee powder, cocoa powder, liquid detergent, monosodium glutamate.
The solvent is one which dissolves in it solute particles or molecules. Solvent are cow's milk, water, and fruit extract.
A cannon is fired horizontally from the edge of a small cliff. The height of the cliff is 104.0 m. The cannon ball is fired with a perfectly horizontal velocity of 24.6 m/s and it took 2.3s to reach the ground. How far will the cannon ball fly horizontally before it strikes the ground?
Answers
Answer:
h = 134.65 m
Explanation:
It is given that,
The height of the cliff is 104.0 m, h₀ = 104 m
Initial horizontal velocity of the ball, u = 24.6 m/s
It takes 2.3 s to reach the ground, t = 2.3 s
We need to find how far will the cannon ball fly horizontally before it strikes the ground. let it is h. Using second equation of motion as follows :
\(h=h_0+ut+\dfrac{1}{2}at^2\)
Here, a = -g
So,
\(h=h_0+ut-\dfrac{1}{2}gt^2\\\\h=104+24.6(2.3)-\dfrac{1}{2}\times 9.8\times (2.3)^2\\\\h=134.65\ m\)
So, the cannonball will cover a distance of 134.65 m before it strikes the ground.
ფიზიკაში მჭირდება დახმარება ნაგლმა მასწავლებელმა მთელი თვე გააცდინა და როცა დაბრუნდა ეგრევე საკონტროლო ისეთი საკითხებით რომელიც არც კი განგვიხილია
Answers
Answer:
The photo is blocked cant see anything
Explanation:
A certain lever system is only 30% efficient. The following changes are considered:
change 1: Use a stiffer lever to reduce energy lost bending the lever.
change 2: Make a longer lever that will require less force.
Which change would make the lever more efficient?
Change 1 would make the lever more efficient because less energy would be lost.
Change 2 would make the lever more efficient because this would make it easier to lift.
Change 1 would make the lever more efficient because this would make it easier to lift.
Change 2 would make the lever more efficient because less energy would be lost.
Answers
Answer: Change 2 would make the lever more efficient because this would make it easier to lift.
Explanation:
The considered change is: Make a longer lever that will require less force because it would make the lever more efficient because this would make it easier to lift.
What is lever?A beam is pivoted at a fixed fulcrum, to form a simple machine known as a lever. A body that can rotate about a point on itself is called a lever.
The lever is classified into three types based on where the fulcrum, weight, and effort are located. Additionally, leverage is a systemic mechanical advantage.
One of the six simple devices that Renaissance scientists identified. Leverage is the ability to increase an input force into a bigger output force through the use of a lever. The mechanical advantage of the lever is determined by the ratio of output force to input force.
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an 86 kg construction worker sits down 2.5 m from the end os a 1450 kg steel beam to eat his lunch Part A What is the tension in the cable? Express your answer to three significant figures and include the appropriate units.
Answers
The tension in the cable is 1450 N. The appropriate units for tension are newtons (N).
we need to use the principle of torque equilibrium. The torque due to the weight of the steel beam must be balanced by the torque due to the tension in the cable.
The torque due to the weight of the steel beam can be calculated as follows:
torque = weight x distance from the pivot point
torque = 1450 kg x 2.5 m
torque = 3625 N*m
The torque due to the tension in the cable can be calculated as follows:
torque = tension x distance from the pivot point
torque = tension x 2.5 m
Since the system is in equilibrium, these two torques must be equal:
3625 N*m = tension x 2.5 m
Solving for tension, we get:
tension = 3625 N*m / 2.5 m
tension = 1450 N
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A Bugatti Chiron travels 116 m/s for 10 seconds. How far did it travel? A. 116 m B. 11.6m C. 0.086m D. 1.160m
Answers
Answer:
V= 1,160 mExplanation:
formula:V= V* T
remplazamos:V= 116m /s * 10s
V= 1,160 m
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Answer the following angular speed questions. (Enter your answers using exact values.) (a) A wheel of radius 22 ft. is rotating 13 RPM counterclockwise. Considering a point on the rim of the rotating wheel, what is the angular speed in rad/sec and the linear speed w in ft/sec? w = ___ rad/sec v = ___ ft/sec (b) A wheel of radius 6 in, is rotating 30°/sec. What is the linear speed v, the angular speed in RPM and the angular speed in rad/sec? v = ___ in/sec w = ___ rpm
w = ___ rad/sec
(c) You are standing on the equator of the earth (radius 3960 miles). What is your linear and angular speed? v = ___ mph w = ___rad/hr (d) An auto tire has radius 12 inches. If you are driving 75 mph, what is the angular speed in rad/sec and the angular speed in RPM? w = ___ rad/sec w = ___ rpm
Answers
(a) The radius of the wheel = 22 ft
The wheel is rotating 13 RPM counterclockwise
Angular speed = angular velocity = ω = 2πf = 2 × π × 13 = 26π rad/min (since 1 rev = 2π radians)
Since 1 min = 60 sec, ω = (26π)/60 rad/sec = 13π/30 rad/sec
The linear speed v of a point on the rim of the wheel is given by v = r × ω = 22 × 13π/30 = 22.82 ft/s
Therefore, w = 13π/30 rad/sec and v = 22.82 ft/sec
(b) The radius of the wheel = 6 inThe wheel is rotating at 30°/sec
The angular speed = ω = 30°/sec × (π/180°) = π/6 rad/sec
The linear speed v of a point on the rim of the wheel is given by v = r × ω = 6 × π/6 = π in/sec
The angular speed in RPM can be calculated as follows:
In 1 min, the angle rotated = 360°No. of seconds in 1 min = 60∴
The angle rotated in 1 sec = 360°/60 = 6° or (π/30) radThe angular speed in rad/sec and the angular speed in RPM is given by w = π/6 rad/sec and w = (30/π) × π/6 = 5 RPM
(c) The radius of the Earth = 3960 milesThe circumference of the Earth = 2 × π × radius = 2 × π × 3960 ≈ 24,902 miles (approx.)
One rotation of the Earth is completed in 24 hours or 24 × 60 × 60 = 86,400 secLinear speed v of a point on the equator of the Earth is given byv = circumference of the Earth/time taken for 1 rotation= 24,902/86,400 ≈ 0.2887 miles/sec
Therefore, v = 0.2887 × 60 × 60 = 1040 miles/hourAngular speed = ω = 2πf = 2π/Twhere T = time taken for 1 rotation of the Earth= 24 hours = 24 × 60 × 60 = 86,400 sec∴ ω = 2π/86,400 rad/sec
Angular speed in RPM can be calculated as follows:In 1 min, the angle rotated = 360°No. of seconds in 1 min = 60∴
The angle rotated in 1 sec = 360°/60 = 6° or (π/30) radThe angle rotated in 24 hours = 360°No. of seconds in 24 hours = 24 × 60 × 60 = 86,400∴
The angle rotated in 1 sec = 360°/86,400 = 1/240° or π/43,200 radThe angular speed in RPM is given by w = (360°/43,200) × 60 = 0.1666 RPM (approx.)
(d) The radius of the tire = 12 inchesThe speed of the car = 75 mphLet the car travel for 1 hour in which the tire makes x revolutions∴
The distance travelled by the car in 1 hour = 75 miles = circumference of the tire × x= 2π × 12 × x inches= 24πx inchesTherefore, 24πx = 75 × 5280 × 12 inches or x = 19600 revolutions∴
The tire makes 19600 revolutions in 1 hour= 19600 × 2π radians= 39200π radians∴ Angular speed = ω = 39200π/3600 = 109.11 rad/sec= (109.11/2π) RPM= 17.36 RPM (approx.)
Therefore, the angular speed in rad/sec is 109.11 rad/sec and the angular speed in RPM is 17.36 RPM.
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What Determines the amount of TE of an object
Answers
Answer:
To find the volume of a rectangular object, measure the length, width and height. Multiply the length times the width and multiply the result by the height. The result is the volume. Give the result in cubic units, such as cubic centimeters.
Explanation:
Answer:
Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. The amount of kinetic energy depends on mass and speed.
Explanation:
What does the survey reveal about your participation in rereational activity
Answers
Answer:
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compared to a coastal location of the same elevation and latitude, an inland location is likely to have:
A)warmer summers and cooler winters
B) warmer summers and warmer winters
C) cooler summers and cooler winters
D) cooler summers and warmer winters
Answers
Answer:
Explanation:
Compared to a coastal location of the same elevation and latitude, an inland location is likely to have **cooler summers and warmer winters** . Coastal climates tend to have wetter winters and drier summers, whereas inland climates have more humid summers and drier winters . Coastal climates are typically limited to narrow strips along the edges of continents, whereas inland climates tend to occur over broad swaths of continental interiors .
I hope this helps answer your question!
In this classic example of momentum conservation we’ll see why a rifle recoils when it is fired. A marksman holds a 3.00 kg rifle loosely, so that we can ignore any horizontal external forces acting on the rifle–bullet system. He fires a bullet of mass 5.00 g horizontally with a speed vbullet=300m/s . What is the recoil speed vrifle of the rifle? What are the final kinetic energies of the bullet and the rifle?
Question:
The same rifle fires a bullet with mass 7.7 g at the same speed as before. For the same idealized model, find the ratio of the final kinetic energies of the bullet and rifle.
Answers
The ratio of final kinetic energies of the bullet to the rifle is: Kf/Kr = 346.5 J/0.375 J = 924.
The momentum of the rifle before firing the bullet is zero. The bullet is fired horizontally with a speed of 300 m/s. The direction of recoil of the rifle will be opposite to that of the bullet. Let the recoil velocity of the rifle be vr. Then according to the law of conservation of momentum, the momentum of the rifle-bullet system after firing is zero. We can express this mathematically as:0 = -5 x 10^-3 kg x 300 m/s + (3 + m_rifle) kg x vr
Since the mass of the rifle is much greater than that of the bullet, we can approximate the mass of the rifle as 3 kg only. Solving the above equation for vr we get, vr = (5 x 10^-3 kg x 300 m/s)/3 kg = -0.5 m/s.
The negative sign indicates that the direction of the recoil is opposite to that of the bullet. The initial kinetic energy of the bullet and the rifle are zero. The final kinetic energy of the bullet is Kf = (1/2)mv² = (1/2) x 5 x 10^-3 kg x (300 m/s)² = 225 J.
The final kinetic energy of the rifle is Kr = (1/2)mv² = (1/2) x 3 kg x (0.5 m/s)^2 = 0.375 J.
For a bullet of mass 7.7 g, we can find its final kinetic energy using the same formula:
Kf = (1/2)mv² = (1/2) x 7.7 x 10^-3 kg x (300 m/s)² = 346.5 J.
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Difference between dynamo and generator
Answers
Answer:
Dynamos and Generators convert mechanical rotation into electric power.
Dynamo - a device that makes direct current electric power using electromagnetism
Generator - used to describe an alternator that creates AC power using electromagnetism.
Explanation: so dynamo makes direct electric power using electromagnetism. A generator creates AC power using electromagnetism
If a rabbit accelerates from rest at 7.5 m/s2 for 3 seconds, how fast will it begoing? *
Answers
Given data:
* The initial velocity of the rabbit is u = 0 m/s.
* The acceleration of the rabbit is,
\(a=7.5ms^{-2}\)* The time taken is t = 3 s.
Solution:
By the kinematics equation, the final velocity of the rabbit is,
\(v-u=at\)Substituting the known values,
\(\begin{gathered} v-0=7.5\times3 \\ v=22.5\text{ m/s} \end{gathered}\)Thus, the velocity of the rabbit is 22.5 m/s.
why is it more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity?
Answers
It is more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity because of static friction.
Static friction refers to the resistance encountered when attempting to initiate the movement of two objects that are in contact with each other but not currently in motion relative to each other. When an object is at rest, the force of static friction acts in the opposite direction to any force applied to it.
In this case, the force applied to the carton is the force needed to start moving it from rest. The force of static friction is greater than the force applied to the carton, making it difficult to start moving the carton from rest.
Once the carton is moving with constant velocity, the force of static friction is no longer acting on it. The only force acting on the carton is the force that is applied to keep it moving at a constant velocity. This force is equal to the force of kinetic friction which is less than the force of static friction.
To summarize, the initial effort required to overcome the static friction between a heavy carton and its resting position is greater compared to the continuous force needed to maintain its constant velocity. The force of static friction is greater than the force applied to the carton, making it difficult to start moving the carton from rest.
Once the carton is moving with constant velocity, the force of static friction is no longer acting on it, and the only force acting on the carton is the force that is applied to keep it moving at a constant velocity.
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wheels from a toy cart are rolled from a concrete sidewalk onto the following surfaces: a, a paved driveway; b, a grass lawn; and c, close-cropped grass on a golf-course putting green. due to slowing, each set of wheels bends at the boundary and is deflected from its initial straight-line course. rank the surfaces according to the amount each set of wheels bends at the boundary, from greatest amount of bending to least. explain your answer.
Answers
The ranking of the surfaces according to the amount of bending experienced by the wheels at the boundary would be: surface a, surface b, and surface c, with surface a causing the greatest amount of bending and surface c causing the least.
The amount of bending experienced by the wheels at the boundary between different surfaces can be explained by the difference in the coefficients of friction between the surfaces.
When the wheels transition from the concrete sidewalk to the paved driveway (surface a), the coefficient of friction changes abruptly, causing a significant bending of the wheels at the boundary. This is because concrete has a higher coefficient of friction than pavement, which causes the wheels to slow down quickly as they move from the sidewalk to the driveway. The sudden change in speed and direction of motion causes the wheels to bend and deflect from their initial straight-line course.
When the wheels transition from the paved driveway to the grass lawn (surface b), the coefficient of friction decreases even more, causing the wheels to slow down even more slowly. This results in less bending of the wheels at the boundary between the surfaces.
Finally, when the wheels transition from the grass lawn to the close-cropped grass on the golf course putting green (surface c), the coefficient of friction is even lower, causing the wheels to slow down gradually and smoothly. This results in the least amount of bending of the wheels at the boundary between the surfaces.
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If an equation is balanced,it demonstrates the law of conservation of mass
True or False
Answers
Answer: True
Explanation:
A property that can be measured or observed without matter
changing to an entirely different substance is called physical.
Answers
Answer:
A property that can be measured or observed without matter changing to an entirely different substance is called physical property .
Find the resultant of these two vectors: 200 units due east and 400 units 30.0° north of west.
Answers
The resultant of the two given vectors is 346.4 units.
What is the resultant of the three vectors?The resultant of the three vectors is the sum of all the three vectors acting together. The resultant vector is the single vector that will represent all the three vectors in terms of magnitude and direction.
The sum of the vectors in x-direction;
Vx = V cosθ
where;
θ is the angle of inclination of each vectorfor 200 units, θ = 0⁰ (above the horizontal)
for 400 units, θ = 60⁰ (above the horizontal)
Vx = 200 cos(0) - 400 cos(60)
Vx = 0
The sum of the vectors in y-direction;
Vy = 200 sin(0) + 400 sin(60)
Vy = 346.4 units
The resultant vector is calculated as;
V = √(Vx² + Vy²)
V = √(0² + 346.4²)
V = 346.4 units
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if you are in the earths umbra on the earth surface then
Answers
If you are in the Earth's umbra on the Earth's surface, then you are experiencing a total lunar eclipse.
What is the Earth's umbra? The shadow of the Earth is divided into two parts: the umbra and the penumbra.
The umbra is the dark, inner part of the shadow, where all light from the Sun is blocked. When an object passes into the umbra, it is no longer illuminated by sunlight. Lunar eclipses occur when the Earth passes between the Sun and the Moon, with the Moon passing into the Earth's shadow.
There are three types of lunar eclipses: penumbral, partial, and total. A total lunar eclipse occurs when the Moon passes completely into the Earth's umbra, the dark inner part of the Earth's shadow. During a total lunar eclipse, the Moon appears reddish in color due to sunlight being refracted by the Earth's atmosphere.
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what aspect of light did thomas young demonstrate in his now-famous light experiment?
Answers
Thomas Young demonstrated the phenomenon of interference in his famous light experiment, known as Young's double-slit experiment.
By passing a beam of light through a barrier with two closely spaced slits, Young observed a pattern of alternating bright and dark bands on a screen placed behind the barrier.
This pattern could only be explained if light was behaving as a wave, exhibiting interference between the two diffracted beams. The bright bands resulted from constructive interference, where the peaks of the waves aligned, while the dark bands were a result of destructive interference, where the peaks and troughs canceled each other out. This experiment provided strong evidence for the wave nature of light.
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Why is losing an important aspect of sport
Answers
Answer:
blc losing is part of life and u learn how do it again with losing and then you get up and comes to be a winner
Explanation:
How is fat diet different from a low calorie diet
Answers
Carbohydrates (found in fruits, vegetables, pasta, rice, grains, peas, beans, and other legumes)
Proteins (found in meat, poultry, dairy products, eggs, and beans)
Minerals (such as potassium, calcium, and iron)
Vitamins (such as vitamins A, D, E, and K)
Water
Of these six nutrients, carbohydrates, protein and fats provide calories. Each gram of carbohydrate and protein yield 4 calories/gram. Each gram of fat yields 9 calories.
A calorie is a measurement, just like a teaspoon or an inch. Calories are the amount of energy released when your body breaks down (digests and absorbs) food. The more calories a food has, the more energy it can provide to your body. When you eat more calories than you need, your body stores the extra calories as body fat. Even a fat-free food can have a lot of calories. Excess calories in any form can be stored as body fat.
12. What is the magnitude of the angular acceleration of the grindstone?
A) 0.50 rad/s2
B) 1.0 rad/s2
C) 4.5 rad/s2
D) 9.0 rad/s2
E) 18 rad/s2
Answers
9.0 rad/s2, which is the magnitude of the angular acceleration of the grindstone.
The magnitude of the angular acceleration of the grindstone can be calculated using the formula:
angular acceleration = change in angular velocity / time
We are not given the change in angular velocity, but we are given information about the tangential acceleration and radius of the grindstone. We can use these values to find the angular acceleration.
The tangential acceleration of the grindstone can be calculated using the formula:
tangential acceleration = radius x angular acceleration
We are given that the tangential acceleration is 2.25 m/s2 and the radius is 0.25 m. Therefore, we can rearrange the formula to find the angular acceleration:
angular acceleration = tangential acceleration / radius
angular acceleration = 2.25 m/s2 / 0.25 m
angular acceleration = 9.0 rad/s2
Therefore, the answer is D) 9.0 rad/s2, which is the magnitude of the angular acceleration of the grindstone.
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Uppoe that a phone i dropped from a light pole 70. 0 meter high. How far will the phone have fallen after 3. 00 econd
Answers
The formula for horizontal distance is x = Vx * t, where t is the time. The formula for vertical distance from the ground is y = h + Vy * t - g * t2 / 2, where g is the acceleration of gravity.
What is the free fall equation?
Where g is the acceleration of gravity, vf is equal to g * t. On Earth, the value of g is 9.8 m/s/s. The velocity of the object after being dropped from rest for any given period of time can be calculated using the aforementioned equation.
How is height determined?
At the spot where the ruler, book, or other flat object meets your head, lightly mark the wall with a pencil. Measure the distance from the floor to the mark on the wall using a tape measure, preferably one made of metal that will stay straight.
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How to keep my family safe after a hurricane?
Answers
Answer:
Stay Safe After a Hurricane or Other Tropical Storm1. Stay out of floodwater.
2. Never use a wet electrical device.
3. If the power is out, use flashlights instead of candles.
4. Prevent carbon monoxide poisoning.
5. Be careful near damaged buildings.
6. Stay away from power lines.
7. Protect yourself from animals and pests.
8. Drink safe water. Eat safe food.
an inductor with l = 9.85 mh is connected across an ac source that has voltage amplitude 40.0 v. You may want to review (Pages 1023 -1028) For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of An inductor in an ac circuit Part A What is the phase angle ф for the source voltage relative to the current? Express your answer with the appropriate units.
Answers
The inductance (L) is 9.85 mH (millihenries), we need to convert it to henries by dividing it by 1000, resulting in 0.00985 H.
Why is the inductance value converted from millihenries to henries?In an AC circuit, the phase angle (ф) between the source voltage and the current in an inductor can be determined using the formula:
ф = arctan(ωL/R)
where ω is the angular frequency of the AC source, L is the inductance, and R is the resistance in the circuit.
Given that the inductance (L) is 9.85 mH (millihenries), we need to convert it to henries by dividing it by 1000, resulting in 0.00985 H.
The phase angle (ф) can be calculated once we know the angular frequency (ω) and the resistance (R) in the circuit. However, the problem statement does not provide the value of the resistance. Without the resistance value, it is not possible to determine the exact phase angle (ф).
To calculate the phase angle, you need to know the value of the resistance in the circuit and the angular frequency of the AC source. Please provide the value of the resistance so that I can assist you further in calculating the phase angle.
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You start from rest and accelerate at a rate of 4 m/s2. What is your displacement after 3 seconds?
Answers
Answer:
Displacement = velocity x time.
=4×3
=12m/s
The properties of being
a. clear and bright
b. useful and profitable
make a diamond a gemstone.
c. easy to obtain and beautiful
d. colorful and profitable
Answers
Answer:
D !!!
Explanation:
Answer:
D
Explanation:
Paul wants to jump his car over 45 barrels. Each barrel is 1m wide. If he takes off horizonally from a ramp that is 5.5 m higher than where he will land, how
fast does he need to drive to clear the barrels?
Paul needs to go
mis to clear the barrels ( Give answe to the hundreths place)
Answers
Answer:
h = -5.5 = 1/2 g t^2 distance he will fall in time t
t = (11 / 9.8)^1/2 using 9.80 m/s^2 for g
t = 1.06 sec
So Vx = 45 m / 1.06 s = 42.47 m/s