The lowest temperature recorded in a particular city during the past year was -13.41* C. What was the temperature on the Kelvin scale?

Answer:

-12.38 N

Explanation:

This question requires you to first find the acceleration then apply Newton's 2nd law of motion to find the force.

To find deceleration use the formula;

v²= u²+2ad ---where

v= final speed = 0 m/s

u= initial speed = 3.0 m/s

a= acceleration { in this case , deceleration} = ?

d= distance from the point where its passenger rolled off= 4.0 m

therefore ;

\(a=\frac{v^2-u^2}{2d}\)

\(a=\frac{0^2-3^2}{2*4} =\frac{-9}{8} m/s^2\)

Mass of the sled is calculated from its weight force.

Weight force = mg

mass of sled = weight force / g  where g= 10 m/s²

mass of sled = 110/10 = 11kg

The magnitude of horizontal net force will be : F= ma  where ;

m= mass of sled = 11 kg

a= deceleration = -9/8 m/s²

F = 11 * -9/8 = -12.38 N

Force is acting on the opposite direction of the initial motion of the sled.

The magnitude of the horizontal net force acting on the sled is 12.375 N.

Given data:

The initial speed of sled is, u = 3.0 m/s.

The final speed of sled is, v = 0 m/s.

The distance covered before stopping is, s = 4.0 m.

The weight of sled is, W = 110 N.

Using the Newton's second law, the net horizontal force acting on the sled is given as,

F = ma

here,

m is the mass of sled.

a is the acceleration of sled.

Mass is calculated from the weight as,

W = mg

110 = m (10)

m = 11 kg.

Now, using the second kinematic equation of motion to obtain the acceleration of sled as,

\(v^{2}=u^{2}+2(-a)s\\\\0^{2}=3^{2}+2(-a)4\\\\8a=9\\\\a=1.125 \;\rm m/s^{2}\)

Then the magnitude of net horizontal force is,

\(F = ma\\\\F = 11 \times 1.125\\\\F = 12.375\;\rm N\)

Thus, we can conclude that the magnitude of the horizontal net force is 12.375 N.

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Answer:

When the rock has fallen 12.0 m;

The kinetic energy of the rock is approximately 3,531.6 J

The potential energy of the rock is approximately 6,768.9 J

Explanation:

The question relates to the characteristic constant total mechanical energy of a body

The mass of the rock that falls, m = 30.0 kg

The height of the cliff from which the rock falls, h₁ = 35.0 m

The required information = The kinetic and potential energy when the rock has falling 12.0 m

The kinetic energy is given by the formula, K.E. = 1/2×m×v²

The potential energy is given by the formula, P.E. = m·g·h

Where;

g = The acceleration due to gravity ≈ 9.81 m/s²

The velocity of the rock after falling through a given height, h is given by the formula, v² = 2·g·Δh

The total mechanical energy of the rock, M.E. = K.E. + P.E. = Constant

At the height of the cliff before falling, Δh =0, therefore v₁ = 0, therefore, K.E. = 1/2×m×v₁² = 0 J

The potential energy at the cliff before the rock begins to fall, P.E. is goven as follows;

P.E. = 30.0 kg × 35.0 m × 9.81 m/s² = 10,300.5 J

At the top of the cliff, M.E. = K.E. + P.E. = 0 J+ 10,300.5 J = 10,300.5 J

∴ M.E. = 10,300.5 J

When the rock has fallen, 12.0 m, Δh = 12.0 m, the speed of the rock, v₂, is given as follows;

v₂² = 2 × 9.81 m/s² × 12.0 m = 235.44 m²/s²

v₂ = √(235.44 m²/s²) ≈ 15.344 m/s

∴ When the rock has fallen 12.0 m, K.E., is given as follows;

K.E. = 1/2×m×v₂²

K.E. = 1/2 × 30.0 kg × 235.44 m²/s² = 3,531.6 J

When the rock has fallen 12.0 m the kinetic energy, K.E. = 3,531.6 J

When the rock has fallen 12.0 m, M.E. = P.E. + K.E.

M.E. = Constant = 10,300.5 J

K.E. = 3,531.6 J

∴ 10,300.5 J = P.E. + 3,531.6 J

P.E. = 10,300.5 J - 3,531.6 J = 6,768.9 J

∴ When the rock has fallen 12.0 m, the potential energy, P.E. = 6,768.9 J.

Explanation:

Calculate position vectors in a multidimensional displacement problem. Solve for the displacement in two or three dimensions. Calculate the velocity vector 

Answer:

True

Explanation:

Velocity is a vector quantity, which means that it carries both magnitude and direction. Hence when direction of a particle changes, although magnitude (speed) may remain same, it's velocity changes due to direction change. For ex. A particle is m... A particle is moving along x axis with speed 1m/s, it's velocity will be represented as 1i (i represents unit vector along x)

But if it now starts moving along y axis, it's velocity is 1j (j represents unit vector along y axis). Hence velocity changes with direction.

brainllest pls .

Convert minutes to seconds and redo his calculation.

The quick response. Atomic clocks are the most precise timekeeping devices we have for measuring the length of time between two events. Atoms in the clocks jump from one energy level to another as a result of the precise frequency at which these clocks emit electromagnetic radiation, such as microwaves.

Time is an illusion, says theoretical physicist Carlo Rovelli, because our simple perception of its flow doesn't match up with physical reality. In fact, much more, including Isaac Newton's depiction of a constantly ticking clock, is illusory, according to Rovelli's claim in The Order of Time.

In an hour, there are 60 minutes. Divide the amount of minutes by 60 to convert it to hours. For instance, 120/60=2 means that 2 hours are equal to 120 minutes.

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Answer:

thermal mass is the ability of a material to absorb, store and release heat... Materials such as concrete, bricks, and tiles absorb and store heat, And then they have Thermal mass.

Explanation:

Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Also remember to rate answers to help other students, While leaving thanks to answers that help you. Have a great day!

Explanation:

a) Velocity and acceleration of a car are parallel when the car is moving along a straight line in the same direction. For example, when a car is gaining speed as it moves forward in a straight line, both velocity and acceleration are directed in the same direction.

b) Velocity and acceleration of a car are anti-parallel when the car is moving along a straight line in the opposite direction. For example, when a car slows down while moving in a straight line, its acceleration is directed opposite to the direction of its velocity, or the other way around.

Answer:

a)

There is only one case where velocity and acceleration are parallel only when they are moving in the same direction.

b)

There are 3 cases where velocity and acceleration are antiparallel.

(i) When both are moving in different direction

   It means :

(ii) When the object is slowing down, where velocity and acceleration are in the opposite direction.

(iii) In case of motion reversal.

Explanation:

The magnitude of this vector is 9.43 and the direction angle of the vector is 58°.

The initial point and the terminal point of the vectors are (3 - 5) and (-2, 3) respectively.

The characteristics of the vector mainly includes the magnitude and the direction of the angle of the vector.

The magnitude of this vector will be given by,

M = √((-2-3)²+(3+5)²)

M = √(25+64)

M = √89

M = 9.43

The direction angle of this vector with the x-axis will be given by,

Tan A = (8/-5)

Tan A = -1.6

A = 58°.

The direction angle of this vector is 58 degree.

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Answer: D. The magnitude is StartRoot 89 EndRoot, and the direction angle is about 122°.

Explanation:

Pilots rely on accurate systems to navigate in conditions with reduced visibility. These systems play a crucial role in ensuring the safety and precision of flight operations.

Pilots largely rely on a variety of onboard equipment and instruments to advise them in scenarios like low visibility weather or nighttime flight. These systems include, among other things, devices like altimeters, gyroscopes, and autopilot systems. They help pilots retain situational awareness and accurately navigate by providing vital information regarding the position, altitude, speed, and direction of the aircraft. Furthermore, cutting-edge technology like GPS (Global Positioning System) that provide real-time positioning information further improve navigational capabilities.

These systems must be extremely precise to guarantee that the aircraft follows the intended flight route and avoids potential hazards or collisions with other aircraft. Pilots must rely on these devices to maintain the necessary spacing from other aircraft and to carry out safe takeoffs, landings, and manoeuvres when there is little visibility, such as during fog or dense clouds.

In conclusion, when vision is poor, pilots heavily rely on precision systems to navigate safely and accurately. These technologies offer important information and direction, enabling pilots to maintain control and make wise choices in difficult circumstances.

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Answer:

d = s • t

3m/s • 45s and and the seconds will cancel out.

135 meters

Answer:

velocity=3m/s

time=45sec

displacement=?

Explanation:

we have

velocity=displacement/time

3m/s=displacement/45

displacement=3×45=135m

Mikel runs 135m far.

Answer:

d is correct

Explanation:

The kinetic energy of the car is four times greater at the bottom than it is at the top. At the base of the hill, the car's kinetic energy is 1800 joules.

The momentum an object has as a result of motion is known as kinetic energy. We must exert force on an object if we desire to accelerate it. To apply a force, we must exert effort. Once the work is finished, the objects will be moving because energy has now been transferred to it.

Describe that a travelling internal force and speed are major factors that impact the amount of kinetic energy it will possess. Partially particles can result in the loss of kinetic energy through frictional, sound, and heat.

k = 1 /2 mv²

K = 1 /2 (100 kg) (3 m/s)²

= 450 J

K = 1 /2 (100 kg) (6 m/s)²

k = 1800 J

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Answer:

Since it is given that car starts from rest so initial velocity  

u

=

0 m/s

. The position of car is given, so  

S

=

215 m

.

Explanation:

6346345

Answer:

215 m

Explanation:

The Carnot refrigerator operates on the principle of transferring heat from a cooler region to a hotter region with the help of external work. The amount of heat that the refrigerator can remove from its inside compartment can be determined using the equation:

QC = W*(TC/TH - 1)



Efficiency (η) = (Tc / (Th - Tc))

Where Tc is the cold temperature (inside the refrigerator) and Th is the hot temperature (kitchen temperature). In this case, Tc = 277 K and Th = 287 K.

First, calculate the efficiency:

η = 277 / (287 - 277) = 277 / 10 = 0.277

Next, we can use the formula for the heat removed from the inside compartment, which is given by:

Qc = W / η

Where Qc is the heat removed and W is the work done. In this case, W = 2250 J.

Finally, calculate the heat removed:

Qc = 2250 / 0.277 ≈ 8103 J

So, the refrigerator can remove approximately 8103 Joules of heat from its inside compartment using 2250 Joules of work.

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Answer:

43 mg is less than 5 g

Explanation:

5 g is equivelent to 5,000 mg, this is much larger than 43 mg

Answer:

A 220 N

Explanation:

it’s the only one not marked out on the photo. Hope this helps!

Explanation:

unable to understand ur question,,,sry!

If the body temperature was 10°C, the approximate time of death would be between 12 and 36 hours, depending on the surroundings and other variables.

However, it's crucial to note that the time of death can be influenced by several factors like the environment, clothing, and the person's physical state. The time of death can also be estimated by measuring the body temperature, also known as algor mortis.

After death, the body temperature decreases at a rate of roughly 1.5°C per hour, though this might change depending on the surroundings and other variables. It is impossible to pinpoint the exact time of death if the body temperature was 10°C, although it may indicate that death happened several hours earlier because the body temperature will continue to drop after death.

However, other techniques, like lividity, rigor mortis, and inspection of the stomach contents, are more accurate, hence it is not advised to utilize this method alone to establish the time of death. For a more precise estimation of the time of death, a forensic specialist should be consulted.

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Sulfur and carbon share several similarities in terms of their chemical behavior and ability to form different allotropes. Here are a few ways in which sulfur is similar to carbon:

Allotropy: Both sulfur and carbon exhibit allotropy, meaning they can exist in different forms or allotropes with distinct structures and properties. Carbon is known for its allotropes such as graphite, diamond, and fullerenes (like buckminsterfullerene or C60). Similarly, sulfurhas different allotropes, including rhombic sulfur (S8 rings), monoclinic sulfur, and plastic sulfur. Valence: Both sulfur and carbon can form multiple covalent bonds due to their valence electron configuration. Carbon has four valence electrons, allowing it to form stable bonds with other atoms, leading to the vast diversity of organic compounds. Sulfur, with six valence electrons, can also form multiple bonds and participate in various chemical reactions.

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Answer:

Terminal Velocity

Explanation:

Answer:

Shiny objects don't absorb heat as well as dull objects. Shiny objects reflect heat or they reflect more heat then absorb it. So the heat thats being hit on a shiny object is being reflected instead of being absorbed. Dull objects are better at aborbing heat. So that makes dull objects heat up faster than shiny objects, since shiny reflects more and dull doesn't as much.

Explanation:

I hope it helps! Have a great day!

pan~

Hi there!

To solve, we can use a summation of torques.

For the see-saw to balance, the sum of torques must equal 0, so:

∑τ = 0

Recall that:

τ = rFsinθ

r = distance from pivot (meters)

F = force (N)

In this case, the forces are the weight of the children. Also, we can leave the distance in centimeters for this type of problem, but others do require a conversion to meters.

Multiply each mass by 10 (g ≈ 10 m/s²) to get the weight:

Στ = 270(400) - x(300) = 0

270(400) = 300x

Solve for 'x', the distance in cm away from the fulcrum:

108000/300 = 360 cm

Question:

A block of mass 1kg is placed on an inclined plane at an angle of 30° to the horizontal. Calculate the frictional force, normal reaction, the coefficient of the static friction​

Answer:

Break the mg force into components in the plane of the inclined plank. Now force acting parallel is mgsin37°. Perpendicular force is mgcos37° which is equal to normal force.  

Now calculate max value of friction force which is 0.8*mg cos37°. Since its greater than pulling force mgsin37°, the body will be at rest and acceleration is zero.  

Force applied by surface is vector sum of normal force and friction force acting.

We can use the formula for the centripetal force experienced by a charged particle moving in a magnetic field and when the cosmic ray proton enters our solar system, it experiences an interplanetary magnetic field that is perpendicular to its velocity.

(a) To find the magnetic field in the region of space where the cosmic-ray proton is executing a circular orbit, we can use the formula for the centripetal force experienced by a charged particle moving in a magnetic field. The centripetal force is given by the equation:

F = qvB

Where:
F is the centripetal force,
q is the charge of the particle (in this case, the charge of a proton),
v is the velocity of the particle,
B is the magnetic field strength.

The centripetal force can also be expressed as:

F = mv²/r

Where:
m is the mass of the proton,
v is the velocity of the proton,
r is the radius of the circular orbit.

Equating the two expressions for the centripetal force, we have:

qvB = mv²/r

Rearranging the equation, we can solve for the magnetic field B:

B = mv/rq

Given the energy of the proton (13.0 MeV), we can use the relation between energy and velocity for a particle with rest mass m:

E = mc² = (γ - 1)mc²

Where:
E is the energy of the particle,
m is the rest mass of the particle,
c is the speed of light,
γ is the Lorentz factor.

The Lorentz factor can be expressed as:

γ = E/mc² + 1

Substituting the given energy and rest mass of the proton, we can calculate the Lorentz factor.

Now, we can substitute the values of m, v, and r into the equation for the magnetic field B and solve for B.

(b) When the cosmic ray proton enters our solar system, it experiences an interplanetary magnetic field that is perpendicular to its velocity. In this case, the proton will follow a helical path in the magnetic field.

To find the radius of the proton's circular orbit in this field, we can use the formula for the radius of a helical path in a magnetic field:

r = mv/|q|B

Where:
m is the mass of the proton,
v is the velocity of the proton,
|q| is the magnitude of the charge of the proton,
B is the magnitude of the magnetic field strength.

Substituting the given values of m, v, and B into the equation, we can calculate the radius of the proton's circular orbit in this field.

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The unknown resistor Rx to make the circuit "balance" is 6.08kΩ.

To determine the value of the unknown resistor Rx, we need to analyze the circuit shown in the figure. The circuit is said to be "balanced" when the voltage across the resistor RD is zero. This occurs when the ratio of the resistances in the two arms of the Wheatstone bridge is equal.

In this case, the coarse setting reading is 5 and the fine setting reading is 67. The ratio of the resistances in the two arms can be calculated using the formula: Rx/RD = (coarse setting)/(fine setting).

By substituting the given values, we have Rx/RD = 5/67. To find the value of Rx, we rearrange the equation as Rx = (5/67) * RD. Given that RD is 9.95kΩ, we can calculate Rx as approximately 6.08kΩ.

The circuit shown in the figure is not balanced.

To determine if the circuit is balanced or not, we need to check if the ratio of the resistances in the two arms is equal to the ratio of the resistances in the other two arms of the Wheatstone bridge.

If the ratio of the resistances is equal, the circuit is balanced. However, if the ratio is not equal, the circuit is unbalanced.

In this case, since the readings of the coarse setting and fine setting are given, we can calculate the ratio of resistances in the two arms of the bridge. If this ratio is different from the ratio of resistances in the other two arms, then the circuit is unbalanced.

Unfortunately, the given information does not provide sufficient details to determine whether the circuit shown in the figure is balanced or not.

The formula to find the unknown resistor RA is (RB + RC) × RD.

To find the unknown resistor RA, we need to consider the relationship between the resistances in the Wheatstone bridge. The general formula for the Wheatstone bridge is (RB + RC) / (RA + RD) = (VB / VA), where RB, RC, RA, and RD are the resistances, and VB and VA are the voltages across the corresponding arms of the bridge.

By rearranging the formula, we can solve for RA: RA = ((RB + RC) / (VB / VA)) × RD.

Thus, the formula to find the unknown resistor RA is (RB + RC) × RD.

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The particles or energy in a transverse wave travel up and down, perpendicular to the direction of the wave travel.

Electromagnetic waves are type of wave that do not require material medium for their propagation.

This type of waves travels in vacuum or in open medium.

Examples of electromagnetic waves include the follows;

Electromagnetic waves are known as transverse waves due to their mode of propagation.

In transverse wave, the particles of the medium travels perpendicular to their mode of vibration.

Thus, the particles or energy in a transverse wave travel up and down, perpendicular to the direction of the wave travel.

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When you add more bulbs to a circuit, they all become dimmer.

This happens because the amount of current flowing through the circuit remains constant, but the resistance increases with each additional bulb. The more bulbs that are added, the greater the total resistance, which means less current can flow through each bulb. This results in each bulb receiving less power, causing them to become dimmer.

Adding more bulbs to a circuit creates more resistance, which leads to a decrease in current flow. As a result, each bulb in the circuit receives less power, causing them to become dimmer. The phenomenon is due to the basic laws of electricity, where adding more resistors in a circuit reduces the flow of current and causes a decrease in power.

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Explanation:

=2(0.6 * 5)³

=2( 3 )³

=2(27)

=54

If x = 0.6 and y = 5, the value of 2(xy)³ is 58.

Algebra is the study of variables and the rules for manipulating variables in formulas; it is the common thread that runs through almost all of mathematics.

Elementary algebra deals with manipulating variables as if they were numbers and is thus required in all mathematical applications. Abstract algebra is the name given to the study of algebraic structures such as groups, rings, and fields, which is mostly used in education. Linear algebra, which deals with linear equations and linear mappings, is used in modern geometry presentations and has numerous practical applications.

Given parameters:

x = 0.6

y = 5

We have to find

2(xy)³

= 2 × (0.6 × 5)³

= 2 × (3.0)³

= 2 × 27

= 58

Hence, If x = 0.6 and y = 5, the value of 2(x y)³ is 58.

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Explanation:

Hooke's law is a law of physics that states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance—that is, Fₛ = kx, where k is a constant factor characteristic of the spring, and x is small compared to the total possible deformation of the spring.