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3 years ago

The force of friction occurs primarily because:

Physics

1 answer:

solniwko [45]3 years ago

3 0

Answer:

Explanation:

Friction is a force that opposes motion between any surfaces that are touching. Friction occurs because no surface is perfectly smooth Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

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A miner finds a small mineral fragment with a volume of 5.74 cm^3 and a mass of 28.7 g. What is the density of that mineral frag

statuscvo [17]

P=M÷V
p=28.7÷5.74
p=5

The density is 5.

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3 years ago

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A motorcycle rides on the vertical walls around the perimeter of a large circular room. The friction coefficient between the mot

igomit [66]

Answer:

option D

Explanation:

given,

coefficient of friction between wall and tire = µ

speed of motorcycle = s

friction force = f = μ N

where normal force will be equal to centripetal force

$N = \dfrac{mv^2}{r}$

for motorcycle to not to slip weight should equal to the centripetal force

now,

$m g =\mu \dfrac{mv^2}{r}$

$\mu =\dfrac{rg}{s^2}$

where "rg" is constant

$\mu\ \alpha \ \dfrac{1}{s^2}$

$\mu\ \alpha \ s^{-2}$

Hence, the correct answer is option D

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3 years ago

The reason a penny thrown straight up inside a bus will come back to your hand is that you, the bus, the air inside the bus, and

Mkey [24]

Answer:

its false

Explanation:

since the penny is thrown straight up its not going to move forwad with you and the bus since it has no forces pushing on it. If the bus wasn't moving it would land back on your hand

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3 years ago

A machine is applying a torque to rotationally accelerate a metal disk during a manufacturing process. An engineer is using a gr

Viefleur [7K]

Explanation:

Question 9 A machine is applying a torque to rotationally accelerate a metal disk during a manufacturing process. An engineer is using a graph of torque as a function of time to determine how much the disk's angular speed increases during the process The graph of torque as a function of time starts at an initial torque value and is a straight line with positive slope. What aspect of the graph and possibly other quantities must be used to calculate how much the disk's angular speed increases during the process? The slope of the graph multiplied by the disk's radius will equal the change in angular speed The area under the graph multiplied by the disk's radius will equal the change in angular speed. The slope of the graph divided by the disk's rotational inertia will equal the change in angular speed. The area under the graph divided by the disk's rotational inertia will equal the change in angular speed. The area under the graph multiplied by the disk's rotational inertia will equal the change in angular speed E

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3 years ago

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New attempt is in progress. Some of the new entries may impact the last attempt grading. Incorrect. The hammer throw is a track-

Morgarella [4.7K]

This question involves the concepts of centripetal force, range of projectile and projectile motion.

The magnitude of centripetal force is "2812.8 N".

First, we will find the velocity of the ball by using the formula of the range of the projectile.

$R = \frac{v^2Sin2\theta}{g}$