The Hubble Space Telescope obtains higher-resolution images than most ground-based telescopes because it is:
A. larger.
B. closer to the stars.
C. above Earth's atmosphere.
Answer: C. above Earth's atmosphere.
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Plane A is flying at 600 mph in the northeast direction relative to the Earth. Plane B is flying at 500 mph in the north direction relative to the Earth. What is the speed of Plane B as observed from Plane A?
a. 900 mph c. 357 mph b. 431 mph d. 100 mph
When an acrobat hangs motionless from a pair of rings
A. she has no measurable weight. B. her weight depends on the angles the ropes make with the ceiling. C. her weight is reduced by the upward force the rings exert on her. D. her weight is increased by the upward force the rings exert on her. E. she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her.
The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness. In which diagram(s) is(are) the block in equilibrium?
A. A B. B C. C D. D E. A and B
A 400-g piece of metal at 120°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?
A) 1470 J/(kg?K) B) 2830 J/(kg?K) C) 3420 J/(kg?K) D) 3780 J/(kg?K) E) 4280 J/(kg?K)