4.4. A 10 kg box sits motionless on a ramp that forms a 20° angle with the ground. (a) What must be the size of the friction force along the ramp acting on the box? (b) What is the magnitude of the force pushing up on the box perpendicular to the ram

Classical Dynamics of Particles and Systems
5th Edition
ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter2: Newtonian Mechanics-single Particle
Section: Chapter Questions
Problem 2.51P: Let us make the (unrealistic) assumption that a boat of mass m gliding with initial velocity v0 in...
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I need help on these questions? G= 10 m/s^2= 10 N/kg

4.4. A 10 kg box sits motionless on a ramp that forms a 20° angle with the ground.
(a) What must be the size of the friction force along the ramp acting on the box?
(b) What is the magnitude of the force pushing up on the box perpendicular to the ramp?
4.5. A 0.50 kg basketball bounces upward from the floor (vertically) at a speed of 7.2 m/s. Let's
assume that no one touches the ball as it bounces upward, reaches some maximum height,
and falls back down to the floor (to bounce again).
(a) How much time passes before the ball hits the floor again?
(b) What is the maximum height above the floor the ball reaches?
Transcribed Image Text:4.4. A 10 kg box sits motionless on a ramp that forms a 20° angle with the ground. (a) What must be the size of the friction force along the ramp acting on the box? (b) What is the magnitude of the force pushing up on the box perpendicular to the ramp? 4.5. A 0.50 kg basketball bounces upward from the floor (vertically) at a speed of 7.2 m/s. Let's assume that no one touches the ball as it bounces upward, reaches some maximum height, and falls back down to the floor (to bounce again). (a) How much time passes before the ball hits the floor again? (b) What is the maximum height above the floor the ball reaches?
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