A uniform solid 5.25-kg cylinder is released from rest and rolls without slipping down an inclined plane inclined at 18° to the horizontal. How fast is it moving after it has rolled 2.2 m down the plane?
A) 4.3 m/s B) 3.0 m/s C) 2.6 m/s D) 5.2 m/s E) 3.7 m/s
B
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Bluer stars are brighter than redder stars of the same size. Assume both are typical stars
a. True b. False Indicate whether the statement is true or false
I attach a 2.0-kg block to a spring that obeys Hooke's Law and supply 4.0 J of energy to stretch the spring. I release the block; it oscillates with period 0.30 s. The amplitude is:
a. 38 cm. c. 9.5 cm. b. 19 cm. d. 4.3 cm.
A solid uniform sphere is rolling without slipping along a horizontal surface with a speed of 5.5 m/s
when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the sphere after it has rolled 3.0 m up as measured along the surface of the ramp? A) 4.0 m/s B) 8.0 m/s C) 1.9 m/s D) 2.2 m/s E) 3.5 m/s
After a supernova explosion, the remains of the stellar core can be
A) either a neutron star or a black hole. B) a neutron star only. C) a black hole only. D) a white dwarf, neutron star, or black hole.