The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in
A) winter.
B) spring.
C) summer.
D) none of the above
Answer: A
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From what height above the surface of the earth should an object be dropped to initially have an acceleration of 0.54g? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 2300 km B) 1700 km C) 5400 km D) 2900 km
If you want to stop a car without anti-lock brakes as quickly as possible on an icy road, you should
A. Jam on the brakes as hard as you can. B. Push on the brakes as hard as you can without locking the car’s wheels and thus making the car skid. C. Pump the brakes. D. Do something else (specify).
A 2.0-kg ball is moving with a constant speed of 5.0 m/s in a horizontal circle whose diameter is 1.0 m. What is the magnitude of the sum of the forces exerted on the ball?
A) 0 N B) 20 N C) 40 N D) 50 N E) 100 N
What conditions are necessary for an annular solar eclipse?
A) New Moon on equator at perigee B) Full Moon on ecliptic at perihelion C) New Moon on ecliptic at perigee D) New Moon on equator at apogee E) New Moon on ecliptic at apogee