1. A 10 kg box is pulled by a force of 40.0 N using a rope at a 15.0 degree angle above the horizontal. The coefficient of kinetic friction between the box and the floor is 0.250. draw a free body diagram and caluclate the following:

a. the normal force acting on the box

b. The net horizontal force acting on the box

c. the acceleration experienced by the box

answers: a.) 87.6 b.) 16.7 c . 1.67

 

2. A projecile is launched at 22.5 m/s, 37.0 degrees above horizontal from a 90.0 m high cliff. Calculate the following:

a. the x and y components of the initial projectile velocity

b. the maximum height of the projectile above the cliff

c. the elapsed time between launch and landing

d. the horizontal distance traveled by the projectile

answers: a: Vx0: 18.0m/s Vy0: 13.5 m/s

b. 9.35 m

c. 5.88 s

d. 106 m

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