The
of an object shows how fast the object is moving at a specific
Answers
Answer:
Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves. In physics, velocity is speed in a given direction. When we say a car travels at 60 km/h, we are specifying its speed.
Related Questions
A 1 kg water balloon falls downward and experiences a 4.9 N air resistance as it approaches the ground. What is the acceleration of the water balloon when it experiences this air resistance?
Answers
answer each problem with only one note
physics as a subject involves measurement and estimation,giving examples of everyday life situations, explain the meaning and what is done in each case
Answers
Answer:
57
Explanation:
A figure skater is spinning with her arms held straight out. Which has greater rotational speed, her shoulders or her fingertips? Why?
Answers
The figure skater spinning with her arms held straight out will have greater rotational speed at her fingertips compared to her shoulders.
Rotational speed of a figure skaterWhen the skater extends her arms straight out, the moment of inertia increases as the mass is distributed farther from the axis of rotation (her body).
According to the conservation of angular momentum, the product of moment of inertia and angular velocity remains constant unless an external torque acts on the system.
Since the moment of inertia increases when her arms are extended, the angular velocity must decrease to maintain the constant angular momentum.
As a result, the rotational speed is higher at her fingertips because they have a larger distance from the axis of rotation compared to her shoulders.
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Explain how scientific theories can influence the work that future
scientists may do.
Answers
Answer:
Scientific theories allow scientists to make predictions.
Which of the following statements is true about fluorescent lighting
Answers
The statement "The excitation of the mercury vapor glows the phosphorus coating inside the lamp of a fluorescent lighting." is true.
In a fluorescent lamp, the electric current excites the mercury inside the lamp which is in vapor form. This process generates the ultraviolet light wave of very short wavelength, which causes the glow of phosphorus coating inside the lamp. Thus a fluorescent lamp converts the very little electrical energy into useful and sufficient light energy.
--The given question is incomplete, the complete question is "Which of the following statement is true about fluorescent lighting? a) Phosphorus coating inside the lamp of a fluorescent lighting glows by the excitation of the mercury vapor. b) The efficiency of fluorescent lighting is much low."
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__ modified the concept by adding an internal combustion engine and marketing hybrids that were part electric and part gas powered
Answers
Hybrid
Hybrid modified the concept by adding an internal combustion engine and marketing hybrids that were part electric and part gas powered.
The driving wheels of hybrid vehicles receive power from their drivetrains. A hybrid car has numerous sources of propulsion.There are numerous hybrid configurations. A hybrid vehicle might, for instance, get its energy from burning gasoline while alternating between an electric motor and a combustion engine.Although they have primarily been employed for rail locomotives, electrical vehicles have a long history of integrating internal combustion and electrical transmission, like in a diesel-electric power-train. Because the electric drive transmission directly substitutes the mechanical gearbox rather than serving as an additional source of motive power, a diesel-electric powertrain does not meet the definition of a hybrid.Only the electric/ICE hybrid car type was readily accessible on the market as of 2017. One type used parallel operation to power both motors at the same time. Another ran in series, using one source to supply power solely and the other to supply electricity. Either source may act as the main driving force, with the other source serving to strengthen the main.To learn more about hybrid vehicles visit:
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10. Jared and Claire are climbing the stairs. Jared gets tired and stops halfway to the fourth floor. Claire makes it to the fourth floor without a problem. If Jared is twice as heavy as Claire, who has more gravitational potential energy? Explain your answer.
Answers
Answer:
They both have the same GPH
Explanation:
GPE = mgh
m = mass of Claire
2m = mass of Jared
h = height of Claire
h/2 = height of Jared
GPE-jared = (2m)(g)(h/2) = mgh
GPE-claire = mgh
They both have the same GPH
2. What is the period of 350 waves passing a point in 5 seconds?
Answers
Answer:
IF SHE BREATHS SHES A T.H.OT
Explanation:
Pls dont hate me its meme k ,_.
How long would a charge of 600c take to move round a circuit at a steady rate of 12c/s?
Answers
The charge would take 50 seconds to move round the circuit at a steady rate of 12c/s.
To calculate the time it takes for a charge to move round a circuit, you need to divide the total charge (600c) by the rate of movement (12c/s).
First, divide 600c by 12c/s:
600c / 12c/s = 50s
So, the charge would take 50 seconds to move round the circuit at a steady rate of 12c/s.
To explain further, the calculation is based on the fact that charge is a measure of the electric current flowing through a circuit, and it is measured in coulombs (c). The rate of movement or flow of charge is measured in coulombs per second (c/s).
By dividing the total charge by the rate of movement, we can determine the time it takes for the charge to complete one full round or cycle around the circuit. In this case, dividing 600c by 12c/s gives us a time of 50 seconds. This means that it would take 50 seconds for the charge of 600c to complete one full round at a steady rate of 12c/s.
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5. Look at the equations for maximum height, time of flight and
range. Check the dimensions of each of these, by putting them
into the equations.
Answers
The dimension of maximum height is M.
The dimension of time of flight is T.
The dimension of range of projectile is M.
What is the maximum height of a projectile?
The maximum height reached by a projectile is the highest vertical height attained by the projectile.
H = u² sin²θ / 2g
where;
u is the initial velocityθ is the angle of projectiong is acceleration due to gravityThe unit of maximum height is meters, so the dimension will be M.
The time of flight of a projectile is the total time spent in air by a projectile.
T = 2usinθ / g
The unit of time of flight is seconds, and the dimension will be T.
The range of a projectile is given as;
R = u² sin(2θ) / g
The unit of range of a projectile is meters and the dimension is M.
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What are the properties of different types of electromagnetic waves?
Answers
Answer:
1. All electromagnetic waves travelS at 3×10⁸m/s in vacuum
2.They are transverse in nature.
3.they can travel through vacuum.( doesn't require any materials for their transmission.
4.They under go phenomena of diffraction,reflection, refraction, interference and polarization.
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The graph represents the relationship between distance and time for an
object that is moving along a straight line. What is the speed of the object
at t = 5.0 seconds? *
Answers
Answer:
cant see image ..
A vehicle starts from rest and accelerates uniformly for 12 seconds to a
velocity of 10ms1. It then runs at a constant velocity and is finally came to rest
in 66m with constant . The total distance covered by the vehicle is
580m. Find the value of acceleration and the time taken.
Answers
The value of the acceleration is 0.76 m/s² and the total time taken by the vehicle is 39 seconds.
Acceleration of the vehicleThe acceleration of the vehicle before coming to rest is calculated as follows;
v² = u² + 2as
where;
v is the final velocityu is the initial velocitya is the accelerations is the distance traveled before stoppingthe car came to rest with constant velocity attained after 12 seconds.
the initial velocity of the car before 12 seconds is zero.
v² = 0 + 2as
a = v²/2s
a = (10²)/(2 x 66)
a = 0.76 m/s²
Time of motion of the vehicled = ut + ¹/₂at²
where;
d is the total distance traveledt is the time of motiona is accelerationu is initial velocity of the vehicle580 = 0 + ¹/₂(0.76)t²
580 = 0.38t²
t² = 580/0.38
t² = 1,526.3
t = √1,526.3
t = 39 seconds
Thus, the value of the acceleration is 0.76 m/s² and the total time taken by the vehicle is 39 seconds.
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Mateo moved the teacher's table with 50 N of force for 2 meters.. How
much work is done in pushing the table?
Answers
Statement:
Mateo moved the teacher's table with 50 N of force for 2 meters.
To find out:
The work done in pushing the table.
Solution:
Force (F) = 20 NDisplacement (s) = 2 mAngle between displacement and force (θ) = 0We know, work is said to be done when force acting on a body produces motion in the direction of force applied.And the formula for work done isF s Cos(θ)Therefore, the work done in pushing the table= 50 × 2 × Cos (0°) J= 100 × 1 J= 100 JAnswer:
The work done in pushing the table is 100 J.
Hope it helps.
If you have any query, feel free to ask.
If 2.2 lbs = 1.0 kg, and Megan Progress weighs 130 lbs, what is her weight in newtons?
(F= ma). where acceleration due to gravity is 9.8 m/s2
Answers
Answer:
Force = 2802.8 Newton
Explanation:
Given the following data;
Mass = 130 lbs
But, 2.2 lbs = 1.0 kg
130 lbs to kg = 130 * 2.2 = 286 kg
Acceleration due to gravity = 9.8m/s²
To find the force in Newton;
Force = mass * acceleration due to gravity
Force = 286 * 9.8
Force = 2802.8 Newton
4. Priyanshi Is Writing Some Statements But She is Confused To Know Whether The Statements
Are Correct Or Not? Which answer do you think is correct?
[A] We cannot see anything through an opaque object.
[B] Those materials which do not allow any light to pass through them are called opaque
materials.
[C] If we cannot see through an object at all, it is not allowing any light to pass through it and
Answers
Answer:
i think the answre is C but the option is not complete !
Answer:
we cannot see anything through an opaque object
Which of the following is an
absolute modifier?
A. tiny
B. thin
C. thick
D. infinite
Answers
Answer: D
Explanation:
Question: Point B is 25 km due east of point A. Starting from point A, a camel walks 20 km in
a direction 15° south of east and then walks 8.0 km due north. What is the resultant angle?
Answers
Resultant angle; θ = 25.59°
This question is dealing with bearings and distance.
We are told that from point A, the camel walks 20 km at 15° in the south of east direction.
Thus, d_s,e = 20 km
Resolving along the horizontal east direction gives; d_e = 20 cos 15
d_e = 19.32 km
Also, resolving along the vertical south direction gives; d_s = 20 sin 15
d_s = 5.18 km
Net vertical distance; d_vert = 8km - 5.18km = 2.72 km
Net horizontal distance; d_hor = 25km - 19.32 km = 5.68 km
Now, the resultant angle is given by;
tan θ = d_vert/d_hor
tan θ = 2.72/5.68
tan θ = 0.4789
θ = tan^(-1) 0.4789
θ = 25.59°
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A truck brakes from 15 m/s to 2 m/s in 15 seconds. What is its acceleration?
Answers
v=final velocity 20m/s
u=initial velocity 15m/s
a=acceleration
t=time 5sec
we plug those into our equation:
20m/s=15m/s+a(5s)
now we just rearrange to solve for acceleration.
(5m/s)/(5s)=a
a=1m/s^2
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Pablo lifts a bag of flour 0.8 m from the floor to a table. He lifted the bag using a force of 20 N. How much work did Pablo do on the bag of flour?
Answers
The amount of work done by Pablo is 16 J.
Work done problemThe work done by Pablo on the bag of flour is given by the formula:
work = force x distance x cos(theta)
where force is the magnitude of the force applied, distance is the distance moved by the object, and theta is the angle between the direction of the force and the direction of the displacement. In this case, the angle between the direction of the force and the direction of the displacement is 0 degrees (since Pablo lifted the bag straight up), so cos(theta) = 1. Substituting the given values, we get:
work = 20 N x 0.8 m x 1 = 16 J
Therefore, Pablo did 16 J of work on the bag of flour.
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I am rowing ofl a river between two cities that are 18 miles apart. When going downstream, I make the journey in 2/3 hour(s). When I return upstream, it takes me 18/13 hour(s). What is the current of the river? What is the speed I would row at in still water?
Answers
The current of the river is 7 mph, and the speed the rower would row at in still water is 20 mph.
How do we calculate?The speed downstream is : V + C).
distance between the cities = 18 miles,
time taken = 2/3 hour
(V + C) = 18 / (2/3) = 27 mph
The speed upstream is = V - C
distance between the cities = 18 miles
time taken upstream = 18/13 hour
(V - C) = 18 / (18/13)
= 13 mph
(V + C) = 27 (Equation 1)
(V - C) = 13 (Equation 2)
We add both equations:
2V = 40
V = 20 mph
(20 + C) = 27
C = 27 - 20
C = 7 mph
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A .5kg book sits on top of a student's desk which is 9m high. How
much gravitational potential energy does the book have as it sits on the desk?
Answers
Answer:
441J
Explanation:
Given parameters:
Mass of book = 5kg
Height = 9m
Unknown:
Gravitational potential energy = ?
Solution:
The gravitational potential energy of a body is the energy due to the position of the body.
It is given as:
Gravitational potential energy = mass x acceleration due to gravity x height
Gravitational potential energy = 5 x 9.8 x 9 = 441J
For the same setup of the faraday law experiment, if the frequency of the magnetic field is changed from 40hz to 120hz, how will the emf voltage change?.
Answers
The magnitude of electromotive force will change in factor 30.
We need to know about the electromotive force of induction to solve this problem. The emf induction appears when there is any change in magnetic flux. The magnitude of emf can be determined by
ε = B . A . N . ώ
where N is coil turns, ε is electromotive force, B is the magnitude of the magnetic field, A is surface area, and ώ is angular velocity.
From the question above, the parameters given are
f1 = 40 Hz
f2 = 120 Hz
The electromotive force ratio will be
ε2 / ε1 = B . A . N . ώ2 / B . A . N . ώ1
ε2 / ε1 = ( 2 . π . f2 ) / ( 2 . π . f1 )
ε2 / ε1 = f2 / f1
ε2 / ε1 = 120 / 40
ε2 / ε1 = 30
ε2 = 30 ε1
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newton's second law in 1 dimension: a 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope. (a) what is the magnitude of the force exerted by the rope on the crate?
Answers
The magnitude of force exerted by the rope on the crate is 312 N.
From Newton's second law of motion, we know the expression of force as,
F = m * a
where, m is mass
a is acceleration
Given that, mass of the crate is 40 kg
Acceleration is 2 m/s²
The net force that the rope is applying to the card while it is sliding downward is given by,
F = m(g - a)
Substituting the values,
F = 40(9.8 - 2)
F = 312 N
Thus, the net force exerted by the rope on the crate is 312 N.
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A wooden block with mass 1.15 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 29.0° (point A). When the spring is released, it projects the block up the incline. At point B, a distance of 7.55 m up the incline from A, the block is moving up the incline at a speed of 6.25 Im/s and is no longer in contact with the spring. The coefficient of kinetic friction between the block and incline is 0.45. The mass of the spring is negligible.
Constants Part A Calculate the amount of potential energy that was initially stored in the spring. Take free fall acceleration to be 9.80 m/s^2.
Answers
To calculate the amount of potential energy initially stored in the spring, we need to consider the conservation of mechanical energy.
The mechanical energy of the block-spring system is conserved when no external forces other than gravity and friction are acting on it. At point A, the mechanical energy is stored entirely as potential energy in the compressed spring. The potential energy stored in the spring can be calculated using the formula: Potential Energy (PE) = (1/2)kx^2
where k is the spring constant and x is the displacement of the spring from its equilibrium position.
To find the spring constant, we need to know the force constant of the spring (k) or the spring's compression distance (x). Unfortunately, this information is not provided in the given question. If you have any additional information about the spring constant or the compression distance, please provide it so that I can assist you further.
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How does energy from an earthquake reach each surface? Describe the three types of seismic waves.
Answers
https://en.m.wikipedia.org › wiki
How can red giants be so bright when they are so cool
Answers
Answer:
The star's luminosity rises above its previous level. Because it is so cool, the surface will be red, and it will be much farther away from the center than it was during the earlier stages of star evolution. Despite its lower surface temperature, the red giant has a large surface area, which makes it very luminous.
a basketball player is getting ready to jump, pushing off the ground and accelerating upward.
A. Draw a motion diagram for her motion while she is still in contact with the floor. B. Draw a force identification diagram while she is still in contact with the floor C. Draw a free body diagram while she is still in contact with the floor. D. Draw a free body diagram for after she leaves the floor.
Answers
(A) show the progression of her motion over time, (B) show the forces acting on the player's body, (C) The force of the ground pushing against her feet, (D) These forces would include her weight (directed downward), and air resistance (directed upward).
A. A motion diagram for the basketball player's motion while she is still in contact with the floor would show her starting at a stationary position, then accelerating upward as she pushes off the ground. The diagram would show the progression of her motion over time, including her velocity and acceleration.
B. A force identification diagram while she is still in contact with the floor would show the forces acting on the player's body, including her weight (which would be directed downward), the force of the ground pushing against her feet (directed upward), and the force she exerts on the ground (directed downward).
C. A free body diagram while she is still in contact with the floor would show the basketball player as a single point or object, with arrows pointing in the direction of the forces acting on her body. These forces would include her weight (directed downward), the force of the ground pushing against her feet (directed upward), and the force she exerts on the ground (directed downward).
D. A free body diagram for after she leaves the floor would show the basketball player as a single point or object, with arrows pointing in the direction of the forces acting on her body. These forces would include her weight (directed downward), and air resistance (directed upward). Once she leaves the ground, she is no longer in contact with the floor, so the ground reaction force would no longer act on her.
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a ball is thrown upward, from the ground, with an initial velocity of 23 m/s. the approximate value of g is 10 m/s2. at what time does the ball reach the high point in its flight?
Answers
Answer:2 m/s , unward , 9 downward
Explanation:
Answer:
2 m/s , inward , 9 downward
Explanation:
I did the test
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If the initial energy of the system was 845.54 J and the final energy of the system is -104.99 J , how much work has been done?
Answers
Answer:
740.55
Explanation:
845.54 + -104.99
=740.55