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torisob [31]
4 years ago
11

Reading Check Infer why the wheels of a car get hot when the car is driven.

Physics
1 answer:
marin [14]4 years ago
7 0

Answer:

Basically it's friction.

Explanation:

The tires of a car are rubber and hollow so there is a lot of pressurized air inside the tire.  As the car travels down the road and the tires rotate and make frictional contact with the ground, the air molecules inside are constantly in motion and making random collisions with the tire walls and each other.  This increase in molecular collisions increases the kinetic energy of the air which in turn increases the temperature of the air.  Also, the outer part of the tire is in constant contact with the road and the high friction coefficient between the two produces heat, especially at higher speeds.  This is why the tires warm up with driving use.  If you measure the air pressure in a tire when its "cold" prior to starting the car and then measure the air pressure again after driving at high speed for 20 minutes, you will notice that the air pressure increases by a few psi as a result of the heat.

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Un lector de DVD, la velocidad de giro es de 5400 rpm. determina el valor velocidad angular en rad/s,la frecuencia y el periodo
zubka84 [21]

Responder:

A) ω = 565.56 rad / seg

B) f = 90Hz

C) 0.011111s

Explicación:

Dado que:

Velocidad = 5400 rpm (revolución por minuto)

La velocidad angular (ω) = 2πf

Donde f = frecuencia

ω = 5400 rev / minuto

1 minuto = 60 segundos

2πrad = I revolución

Por lo tanto,

ω = 5400 * (rev / min) * (1 min / 60s) * (2πrad / 1 rev)

ω = (5400 * 2πrad) / 60 s

ω = 10800πrad / 60 s

ω = 180πrad / seg

ω = 565.56 rad / seg

SI)

Dado que :

ω = 2πf

donde f = frecuencia, ω = velocidad angular en rad / s

f = ω / 2π

f = 565.56 / 2π

f = 90.011669

f = 90 Hz

C) Periodo (T)

Recordar T = 1 / f

Por lo tanto,

T = 1/90

T = 0.0111111s

3 0
3 years ago
What does this picture mean?
ivann1987 [24]
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be aware of large trucks on the roadway
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5 0
3 years ago
Read 2 more answers
Which are properties of a liquid? Check all that apply.
Strike441 [17]

Answer:

the property of liquid are

1 they can flow from one place to another if surface is slanted

2 it cannot be compressed

6 0
3 years ago
Explain why steel is mor dense than water
natta225 [31]
Steel is more dense because it’s heavy while water is light
7 0
3 years ago
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This time particle A starts from rest and accelerates to the right at 65.5 cm/s
FrozenT [24]

Answer:

t = 4 s

Explanation:

As we know that the particle A starts from Rest with constant acceleration

So the distance moved by the particle in given time "t"

d = v_i t + \frac{1}{2}at^2

d = 0 + \frac{1}{2}(65.5)t^2

d_1 = 32.75 t^2 cm

Now we know that B moves with constant speed so in the same time B will move to another distance

d_2 = 44 \times t

now we know that B is already 349 cm down the track

so if A and B will meet after time "t"

then in that case

d_1 = 349 + d_2

32.75 t^2 = 349 + 44 t

on solving above kinematics equation we have

t = 4 s

4 0
3 years ago
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