PHYSICS TEST REVIEW ***PLEASE PROVIDE DETAILED SOLUTIONS FOR ALL QUESTIONS. MAKE
ID: 1551540 • Letter: P
Question
PHYSICS TEST REVIEW
***PLEASE PROVIDE DETAILED SOLUTIONS FOR ALL QUESTIONS. MAKE SURE YOUR ANSWERS MATCH THOSE GIVEN AT THE END OF EACH QUESTION.
5. Three solid, uniform, cylindrical flywheels, each of mass 65.0 kg and radius 1.47 m rotate independently around a common axis. Two of the flywheels rotate in one direction at the other rotates in the opposite direction at 3.42 rad/s . Calculate the magnitude of the net angular momentum of the system.
ANSWER = [298 kg m^(2)/s]
7. A satellite is in circular orbit at an altitude of 2300 km above the surface of a nonrotating asteroid with an orbital speed of 5.9 km/s. The minimum speed needed to escape from the surface of the asteroid is 14.6 km/s, and G = 6.67 × 10^(-11) N m^(2)/kg^(2). What is the mass of the asteroid?
ANSWER = [1.8 × 10^(24)kg]
9. A 10.0-kg uniform ladder that is 2.50 m long is placed against a smooth vertical wall and reaches to a height of 2.10 m, as shown in the figure. The base of the ladder rests on a rough horizontal floor whose coefficient of static friction with the ladder is 0.800. An 80.0-kg bucket of concrete is suspended from the top rung of the ladder, right next to the wall, as shown in the figure. What is the magnitude of the friction force that the floor exerts on the ladder?
ANSWER = [538 N]
NOTE: QUESTION 9 COMES WITH A DIAGRAM I COULD NOT PASTE HERE. TO FIND IT, COPY AND PASTE QUESTION ONTO SEARCH BAR ON CHEGG AND YOU WOULD FIND AN OPTION OF THE QUESTION WITH THE DIAGRAM.
14. A car of mass 1689 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic. If the velocity of the truck is 17 km/h (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car?
ANSWER = [19 km/h]
Explanation / Answer
5. I = m r^2 /2
= 65 x 1.47^2 /2
= 70.23 kg m^2
angular momentum = I w
net angular momentum = Iw + Iw - Iw
= I w
= (70.23) (3.42)
= 240.2 kg m^2 /s
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