If the Sun collapsed to a neutron star or black hole, Earth would
1) spiral into the Sun's core,
2) remain in its present orbit,
3) spiral away from the Sun,
4) itself undergo collapse,
for the variable that changes in Newton's gravitational equation is
5) distance.
6) the mass of the Sun.
7) the mass of Earth.
8) all of these.
9) none of these.
Answer: 2, 9
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A horse and rider travel in a region in which the vertical component of the Earth’s magnetic field is 0.035mT, while the horizontal component is 0.022mT. Attached to the horse’s bridle is a metal bit, a cylinder approximately 15cm long, in the horse’s mouth that is oriented horizontally. If the horse is galloping at 15m/s, what is the induced potential difference between the ends of the bit?
A. 79mV B. 93mV C. 50?V D. 93?V E. 50mV F. 79?V
The de Broglie wavelength of a 0.069 kg golf ball is 4.67 × 10^?34m. What is its speed? (h = 6.63 × 10^?34 J?s)
a. 10 m/s b. 21 m/s c. 3.1 m/s d. 90 m/s e. 4.5 m/s
The K-T impact is thought to have occurred at what site?
a. Iridium b. Chicxulub c. Gubbio d. Alvarez
Three satellites are launched into space connected together. Once in deep space, an explosive charge separates the three satellites and they move apart. The satellites each have different masses with m1 < m2 < m3 . Which of the following statements is always true?
a. The one with mass m1 receives the greatest impulse. b. The one with mass m3 receives the greatest impulse. c. The all must receive equal impulses. d. Although one or more of the above statements could be true in special cases, they are not always true.