When a baseball player hits a ball with a force of 1000 N, the ball exerts a force on the bat of
A) less than 1000 N.
B) more than 1000 N.
C) 1000 N.
Answer: C
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Which of the following statements about novae is true?
A) A star system that undergoes a nova may have another nova sometime in the future. B) A nova involves fusion taking place on the surface of a neutron star. C) A nova is the most powerful type of explosion ever seen in the universe. D) When a star system undergoes a nova, it brightens as much as a star system undergoing a supernova. E) A nova can occur on a single, isolated star.
How did Hubble use the cosmological redshift to determine distance?
What will be an ideal response?
You obtain a 100. W lightbulb and a 50. W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. Which statement is correct?
A) Both bulbs glow at the same increased brightness. B) The 100-W bulb glows brighter than the 50-W bulb. C) Both bulbs glow at the same reduced brightness. D) The 50-W bulb glows more brightly than the 100-W bulb.
A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
What will be an ideal response?