A tired physics student drags their backpack along the ground behind them. They exert a force of 20 N at an angle of 55 degrees above the
horizontal. The backpack has a mass of 5 kg and is moving at a constant velocity.

What is the coefficient of sliding friction between the backpack
and the ground?

double the distance = divide strength by 4

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

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

snell's law

refractve index = sin incidence / sin refraction