If the coefficient of kinetic friction between a 22- kg crate and the floor is 0.30, what horizontal force is required to mive the crate at a steady soeed across the floor? what horizontal force is required if it is zero?

Horizontal force to move the crate at a steady speed across the floor is 64.746 N

There is no horizontal force when coefficient of friction is zero.

Given :

Mass = 22 kg

Coefficient of friction = 0.30

a = 0, because crate moving at a steady speed.

Solution :

Horizontal force to move the crate at a steady speed across the floor is,

F = ma                   (According to Newton's second law)

         (since acceleration is zero)

Now, when coefficient of friction is zero than friction force is also zero. Therefore horizontal force is,

F = 0

So, there is no horizontal force when coefficient of friction is zero.

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when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

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