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3 years ago

6

The coefficient of friction is a number that represents the resistance to sliding between two __ in contact wit

h one another.

2 answers:

pickupchik [31]3 years ago

7 0

APEX

unitless,

surfaces

Varvara68 [4.7K]3 years ago

5 0

Answer:

unitless--surfaces APEX

Explanation:

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A man pushes a shopping cart across a level floor. What force resists the effort force? A) gravity B) friction C) the normal for

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Answer:

B) Friction

Explanation:

Friction is a force that acts when an object is sliding along a surface. Microscopically, this force is due to the fact that the two surfaces are not perfectly smooth, but they have "imperfections" that cause a force that opposes the motion of the object.

For an object sliding on a flat surface, the force of friction has magnitude:

$F_f = \mu_k mg$

where

$\mu_k$ is the coefficient of kinetic friction

m is the mass of the object

g is the acceleration of gravity

The direction of the force of friction is always opposite to the direction of motion of the object.

In reality, friction also acts if the object is at rest and it is pushed by a force; in this case, we talk about static friction, and its magnitude is

$F_f = \mu_s mg$

where $\mu_s$ is called coefficient of static friction, and it is generally larger than the coefficient of kinetic friction.

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3 years ago

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A monochromatic red laser beam emitting 1 mW at a wavelength of 638 nm is incident on a silicon solar cell. Find the following:

tia_tia [17]

Answer:

Explanation:

First we calculate the energy of the photon

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Next we find the total energy per second

total energy= $1*10^{-3}W *\frac{1JS^{-1} }{1W} = 1*10^{-3} JS^{-1}$

Next we calculate the number the photon per second

= total energy ÷ energy of 1 photon

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3 years ago