A football player leaps at 3.0 m/s toward a second football player, who is at the time of the collision moving at 0.5 m/s toward the first player. After the collision, the two players move together at 1.2 m/s. If the originally stationary player's mass is 175 kg, what is the other's mass?
A. 185 kg
B. 119 kg
C. 165 kg
D. 68 kg
C. 165 kg
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Can a rock be accelerated up to lightspeed?
A) No, because any material object's mass becomes infinite as the object approaches lightspeed. B) No, because the theory of relativity states that it is impossible for anything to move at lightspeed. C) No, because any material object's length decreases to zero as the object approaches lightspeed. D) Yes, as we can see from the example of light itself. E) Yes, by projecting the object at a sufficiently high speed from a reference frame that is already moving at a high speed.
Saturn's moon Titan is likely a captured Kuiper belt object
a. True b. False Indicate whether the statement is true or false
The first person to suggest that the Earth moved around the Sun was
A) Aristarchus B) Newton C) Copernicus D) Galileo
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is open,
a.
bulb 1 is glowing; bulb 2 is dark.
b.
bulb 2 is glowing; bulb 1 is dark.
c.
both bulbs glow equally brightly.
d.
both bulbs glow one half as brightly as they do with the switch closed.
e.
both bulbs are dark.