Summary







































 
Aaron Rodgers is playing football in a vacuum where g = 10 m/s². He throws a pass with an initial speed of 15 m/s up and 20 m/s south (downfield). After how much time does the football reach its peak?
A. 1 s
B. 1.5 s
C. 2 s
D. 3 s
Answer



















 
What is the ball's velocity at its peak?
A. zero
B. 10 m/s down
C. 20 m/s south
D. 35 m/s up and south
Answer



















 
What is the acceleration of the ball at its peak?
A. zero
B. 10 m/s2 down
C. 10 m/s2 south
D. 10 m/s2 down & south
Answer



















 
What height does the ball reach above the field?
A. 7.5 m
B. 11.3 m
C. 15 m
D. 22.5 m
Answer



















 
How far downfield does the ball travel?
A. 20 m
B. 30 m
C. 60 m
D. 180 m
Answer



















sb5 4.12
With what speed should a tennis player strike a ball 3.00° above horizontal to clear the net 12.6 m away if the ball must rise 0.330 m?
A. 37.9 m/s
B. 48.6 m/s
C. 55.0 m/s
D. 72.2 m/s
Answer



















klm
A 60-kg person on a merry-go-round is traveling at a constant speed of 4.0 m/s around a 2.0-m-radius circle. What is the acceleration of the person?
person on merry-go-round A. Zero, because the speed is constant.
B. 8.0 m/s2 inward
C. 2.0 m/s2 inward
D. 8.0 m/s2 outward
Answer



















klm
A 60-kg person on a merry-go-round is traveling at a constant speed of 4.0 m/s around a 2.0-m-radius circle. What is the centripetal force on the person?
person on merry-go-round A. 480 N inward
B. 800 N inward
C. 600 N inward
D. 600 N outward
Answer



















PoP5 3.25
Determine the rotation rate required to give an astronaut a centripetal acceleration of 1.40g while in a training apparatus that undergoes circular motion with radius 10.0 m.
astronaut centrifuge at Brooks Air Force Base A. 5.67 rpm
B. 7.82 rpm
C. 0.295 rpm
D. 11.2 rpm
Answer



















PoP5 3.30c
A point on a rotating turntable 20.0 cm from the center accelerates from rest to a final speed of 0.700 m/s in 1.75 s. At t = 1.25 s, find the magnitude and direction of the total acceleration of the point.
A. 0.400 m/s² tangent to path
B. 1.77 m/s² at 45.0° inward from tangent to path
C. 1.31 m/s² at 72.3° inward from tangent to path
D. 1.65 m/s² toward center of turntable
Answer



















klm
Which has more inertia, a supertanker at rest or a motorboat going 15 m/s?
A. supertanker
B. motorboat
C. they're the same
Answer



















PoP5 4.cq2
What is the net force on a 1400-kg car traveling westward at a constant speed of 20 m/s?
A. 28.0 kN
B. 1.40 kN
C. 70 N
D. zero
Answer



















sb5 5.q10
A book resting on a table must have no forces acting on it.

A. TRUE
B. FALSE
Answer







































answer

B. 1.5 s




















answer

C. 20 m/s south

The vertical component of the velocity is zero but the horizontal component remains the same throughout the flight.



















answer

B. 10 m/s² down

The acceleration remains constant throughout the flight: always 10 m/s², always downward.



















answer

B. 11.3 m




















answer

C. 60 m




















answer

B. 48.6 m/s




















answer

B. 8.0 m/s2 inward
Picture (500x88, 1.9Kb)



















answer

A. 480 N inward
Picture (677x80, 2.3Kb)



















answer

D. 11.2 rpm
Picture (838x276, 6Kb)



















answer

C. 1.31 m/s² at 72.3° inward from tangent to path
solution equation



















answer

A. supertanker



















answer

D. zero



















answer

B. FALSE