The density of a submarine cruising beneath the ocean surface has the same density as
A) a crab.
B) iron.
C) a floating submarine.
D) ocean water.
E) none of the above
Answer: D
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An apple falls from a tree and hits the ground 5 meters below with a speed of about
A) 5 m/s. B) 10 m/s. C) 15 m/s. D) 20 m/s. E) not enough information
Explain why Pluto is no longer considered a planet
What will be an ideal response?
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The acceleration of the ball in m/s2 is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)