1. An 89 kg skater slides over a frictionless plane and across an xy coordinate system from the origin to a point with x

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1. An 89 kg skater slides over a frictionless plane and across
an xy coordinate system from the origin to a point with xy
coordinates ( 2.60 m , 4.31 m ) while a constant force acts on her.
The force has magnitude 67.5 N and is directed at a
counterclockwise angle of 104° from the positive direction of the x
axis. How much work is done by the force on the skater during the
displacement?
2.
A roller coaster has a horizontal, circular loop of radius 4.75
m. Cars enter the loop with a speed of 14.5 m/s. How long does it
take for a car to complete the circular loop?
3.05 s
2.06 s
0.488 s
0.327 s
0.655 s
3 If a wheel is turning at 7.0 rad/s, how long does it take
to complete one revolution? Type your answer here
4. A 60-N child sits on a light swing and is pulled back
and held with a horizontal force of 50 N. The magnitude of the
tension force of each of the two supporting ropes is
190 N.
78 N.
260 N.
39 N.
60 N.
5. A force of 500 N is applied outwardly to each end of a
5.0-m long rod with a radius of 34.0 cm and a Young's modulus of
125 x 108 N/m2. The elongation of the
rod is
0.55 μmμm
0.14 μmμm
0.0020 mm
0.0040 mm