Which two planets are known as ice giants?
A. Earth and Mars
B. Jupiter and Saturn
C. Uranus and Neptune
D. Pluto and Charon
Answer: C
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Slanting Surfaces Without Friction: Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct?
A. It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier. B. It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier. C. It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter. D. It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter. E. The two objects reach the bottom of the ramp at exactly the same time.
What principle was Copernicus unable to provide evidence against?
a. uniform circular motion b. heliocentric universe c. geocentric universe d. retrograde motion e. Ptolemy's epicycles
Elastic Collisions: A block of mass m = 4.4 kg, moving on frictionless surface with a speed vi = 9.2 m/s makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure. The second block is originally at rest. Just after the collision, the 4.4-kg block recoils with a speed of vf = 2.5 m/s. What is the mass M of the second block?
A. 7.7 kg B. 12 kg C. 5.6 kg D. 21 kg E. 4.4 kg
What makes the Crab pulsar somewhat unusual among pulsars in general?
A) It is the most intense source of X-rays in the sky. B) It is the fastest pulsar known. C) It is the oldest pulsar observed. D) Its period is not regular like other pulsars. E) It is rather bright at visible wavelengths.