A worker pushed a 30.0 kg block 6.50 m along a level floor at constant speed with a force directed 30.0° below the horizontal. If the coefficient of kinetic friction between block and floor was 0.190, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system?

The work done by worker's force is same as thermal energy 327.2 J

Explanation:

Given :

Mass of block Kg

Displacement m

Angle 30°

Coefficient of kinetic friction

(A)

The work done by the worker's

Here force is given by,

Where

    N

So work done by,

J

(B)

The thermal energy of the block floor system is,

Therefore, the work done by worker's force is same as thermal energy 327.2 J

this is poiselle's equation from fluid mechanic in physics. mech eng

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2