Two small objects, with masses m and M, are originally a distance r apart, and the gravitational force on each one has magnitude F. The second object has its mass changed to 2M, and the distance is changed to r/4
What is the magnitude of the new gravitational force? A) F/32
B) F/16
C) 16F
D) 32F
E) 2F
D
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Why must telescopes observing at long infrared (that is, far-infrared) wavelengths be cooled to low temperatures?
What will be an ideal response?
The critical temperature to initiate the proton-proton cycle in the cores of stars is
A) 3,000 K. B) 5,800 K. C) 2,300,000 K. D) 10 million K. E) 100 million K.
An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2 To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom
If the depth of the crater is 120 m, how long does it take for the rock to fall? A) 3.04 s B) 12.2 s C) 29.3 s D) 32.1 s E) 37.5 s
A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2. What is the horizontal component of its velocity when it is at the highest point of its trajectory?
A) 0 m/s B) 10 m/s C) 75.0 m/s D) 130 m/s E) 150 m/s