A disk, a hoop, and a solid sphere are released at the same time at the top of an inclined plane. They are all uniform and roll without slipping. In what order do they reach the bottom?
A) sphere, hoop, disk
B) hoop, disk, sphere
C) sphere, disk, hoop
D) hoop, sphere, disk
E) disk, hoop, sphere
C
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Pascal's Principle: In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm. What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston? Assume the pistons each have negligible weight.
A. 6.7 × 103 N B. 5.0 × 103 N C. 2.9 × 103 N D. 2.2 × 103 N
Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclined plane by a force F parallel to the plane. The coefficient of kinetic friction between each mass and the plane has the same value mk. At the highest point,
a. KA > KB. b. KA = KB. c. KA < KB. d. The work done by F on A is greater than the work done by F on B. e. The work done by F on A is less than the work done by F on B.
A spring-powered dart gun is un-stretched and has a spring constant 16.0 N/m. The spring is compressed by 8.0 cm and a 5.0 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is
A. 0.125 J. B. 0.090 J. C. 0.075 J. D. 0.051 J. E. 0.030 J.
What kind of object do we think lies in the center of the Milky Way Galaxy?
A) a black hole of about 4 million solar masses B) a gigantic x-ray binary system C) a dense cluster of young, hot stars D) an enormous collection of dark matter, explaining why we detect no light at all from the galactic center