A 14 500-N car on a hydraulic lift rests on a cylinder with a piston of radius 0.100 m. If a connecting cylinder with a piston of 0.050-m radius is driven by compressed air, what force must be applied to this smaller piston in order to lift the car?
a. 1.45E+4 N
b. 5.80E+1 N
c. 4.13E+3 N
d. 3.53E+3 N
e. 3.63E+3 N
a
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A ball is rolled horizontally off a table with an initial speed of 0.18 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.30 s. What is the height of the table? Note: g = 9.8 m/s2 and air resistance is negligible
a. 0.11 m c. 0.33 m b. 0.22 m d. 0.44 m
Where was the Sun in Ptolemy's model of the universe?
A) at the center B) slightly offset from the center C) between Earth and the Moon's orbit D) between the orbits of Venus and Mars E) at the outer edge, beyond Saturn's orbit
A 10-kg block on a rough horizontal surface is attached to a light spring (force constant = 1.4 kN/m). The block is pulled 8.0 cm to the right from its equilibrium position and released from rest. The frictional force between the block and surface has a magnitude of 30 N. What is the kinetic energy of the block as it passes through its equilibrium position?
a. 4.5 J b. 2.1 J c. 6.9 J d. 6.6 J e. 4.9 J
Distance covered per unit of time is called
a. speed. b. acceleration. c. velocity. d. displacement.