Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because
A) it is too dangerous to send the Space Shuttle to service satellites during solar maximum.
B) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits.
C) of increased magnetic interference.
D) they are more likely to have their electronics "fried" by a solar flare during solar maximum.
B
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A 155 g sample of an unknown substance was heated from 25°C to 40°C. In the process, the substance absorbed 569 calories of energy. What is the specific heat of the substance?
Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom?
a. The block that went straight down. b. The block that went down the ramp. c. They both will have the same speed. d. Insufficient information to work the problem.
A motorcycle daredevil wants to ride up a 50.0 m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
a. 79 b. 318 c. 332 d. 355 e. 402
Your friend tells you that last night, they saw Mars high in the sky at midnight. You conclude that
A) Your friend must be mistaken: Mars can never be seen at midnight. B) Mars must be in retrograde. C) Mars must be at its closest distance from the Sun. D) Mars must be at its farthest distance from the Earth.