What will be the kinetic friction coefficient in above incline problem? A) 0.58

Question

What will be the kinetic friction coefficient in above incline problem? A) 0.58 B) 0.23 C) 0.15 D) 1.0 E) None A planet of mass m is a distance d from Earth. Another planet of mass 2m is a distance 2d from Earth. Which force vector best represents the direction of the total gravitation force on Earth? A load of 50 N attached to a spring hanging vertically stretches the spring 20 cm. The spring is now placed horizontally on a table and stretched 15.0 cm. What required to stretch the spring this amount? A) 2500 N/m B) 375N C) 2500 N D) 3.25 N E) None of the above A heavy block is suspended from a vertical spring. The elastic potential energy is stored in the spring is 2 J. What is the spring constant if the elongation of the spring is 10 cm? A) 300 N/m B) 400 N/m C) 200 N/m D) 100 N/m E) None

Explanation / Answer

24)

for the shown arrangement

maximum frictional force = u * N

maximum frictional force = 0.20 * 1 * 10

maximum frictional force = 2 N

hence , the frictional force exerted is A) 2 N

25)

for the frictional force

frictional force = 3 * 9.8 * sin(30)

frictional force = 15 N

26)

coefficient of friction = 15/(3 * 10 * cos(30))

coefficient of friction = 0.58

27) as the gravitational forces is always towards the center of the earth

the correct option is e) is the correct option

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