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3 years ago

Why the brakes of a car gets hotter than the brakes of a bicycle?

Physics

1 answer:

anygoal [31]3 years ago

4 0

Answer:

Frictional force

Explanation:

The brakes of a car gets hotter than the brakes of a bicycle because more frictional force is expended in applying the brake on a car than a bicycle.

To brake a car, the concept of friction is usually adopted. Two surfaces that increases friction when they come in contact are used in braking.

Frictional force is a force that resists the motion of a body. This forces helps to have grasp of motion.

A car requires more resistance to motion to break it because it have more more mass and other component motions parameters.

A bicycle is lighter and will require little friction.

Some of the frictional force applied is converted to heat energy. The amount of this energy expended is proportional to the frictional force.

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A ___ is awarded to the opposing team when that team violently or dangerously charges a opponent. ( in soccer)

Helen [10]

Answer:

(C)Direct kick

Explanation:

In a game of soccer (foot-ball) there are lots of rules involved in the game and there is penalty for each of the rules violated. Some of the rules include penalty kick, free kick, throw in, goal kick etc.

Free kick is of two types; direct kick and indirect kick.

Direct kick is awarded when a player outside 18 yards box violently or dangerously charges a opponent.

Indirect kick can be awarded when a goalkeeper inside 18 yards box commits certain offenses.

Therefore, the correction option is (C)Direct kick

7 0

3 years ago

The velocity of a an object in linear motion changes from +25 meters per second to +15 meters per second in 2.0 seconds.

kodGreya [7K]

Answer:

$-5.0 m/s^2$

Explanation:

Missing question:

What is the object's acceleration?

Solution:

The acceleration of an object is given by

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time taken for the change in velocity

For the object in this problem,

u = +25 m/s

v = +15 m/s

t = 2.0 s

Substituting,

$a=\frac{15-25}{2}=-5.0 m/s^2$

And the acceleration is negative because its direction is opposite to that of the velocity.

5 0

3 years ago

A softball player swings a bat, accelerating it from rest to 2.6 rev/srev/s in a time of 0.20 ss . Approximate the bat as a 0.90

svetoff [14.1K]

Answer:

$\tau=22.13Nm$

Explanation:

information we have:

mass: $m=0.9kg$

lenght: $L=0.95m$

frequency: $f=2.6rev/s$

time: $t=0.2s$

and from the information we have we can calculate the angular velocity $\omega$ . which is defined as

$\omega=2\pi f$

$\omega=2\pi (2.6rev/s)\\\omega=16.336 rev/s$

----------------------------

Now, to calculate the torque

We use the formula

$\tau=I \alpha$

where $I$ is the moment of inertia and $\alpha$ is the angular acceleration

moment of inertia of a uniform rod about the end of it:

$I=\frac{1}{3}mL^2$

substituting known values:

$I=\frac{1}{3} (0.9kg)(0.95m)^2\\I=0.271kg/m^2$

for the torque we also need the acceleration $\alpha$ which is defined as:

$\alpha=\frac{\omega}{t}$

susbtituting known values:

$\alpha=\frac{16.336rev/s}{0.2s} \\\alpha=81.68rev/s^2$

and finally we substitute $I$ and $\alpha$ into the torque equation $\tau=I \alpha$ : $\tau=(0.271kg/m^2)(81.68rev(s^2)\\\tau=22.13Nm$

5 0

4 years ago

!!!!!!!!!!!!!!!PLEASE HELP!!!!!!!!!!!!!!!!!!!!

marshall27 [118]

Given:

An ideal gas expands at constant pressure:

P = 105 pascals
V1 = 1 m3
V2 = 4 m3

then, the gas is compressed to 1/3 of the pressure and volume 2.50 m3.

Work at constant pressure:

W = PΔV

W = 105 pascals * (4 m3 - 1 m3)
W = 315 Joules

Work at constant volume is zero.

6 0

4 years ago

Im pretty sure I know which one just makin sure

AleksandrR [38]

Answer:

shivering raises your body temperature

4 0

3 years ago