A 250-kg crate is placed on an adjustable inclined plane. If the crate slides down the incline with an acceleration of 0.25 m/s2 when the incline angle is 25°, then what should the incline angle be for the crate to slide down the plane at constant speed? Note: g = 9.8 m/s2
a. 12°
c. 24°
b. 21°
d. 29°
C
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A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 91 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)
a. 84 m/s c. 42 m/s b. 38 m/s d. 19 m/s
Suppose an astronomer proposed to build a major, world class telescope (to observe visible light) on your school campus. Would your campus make a good observing site? Why or why not?
What will be an ideal response?
Particles (mass of each = 0.40 kg) are placed at the 60-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the magnitude of the initial linear acceleration of the end of the body opposite the pivot?
a. 15 m/s2 b. 9.8 m/s2 c. 5.8 m/s2 d. 12 m/s2 e. 4.7 m/s2
An ac generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
a. 100 W b. 150 W c. 500 W d. 1000 W e. 2000 W