The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is 10 m/s2
Indicate whether the statement is true or false
F
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One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g/°C.)
a. 11 b. 15 c. 16 d. 13 e. 33
What happens when an interstellar cloud fragment shrinks?
A) It first becomes opaque. B) Density rises. C) Temperature rises. D) Pressure rises. E) All of the above.
Which has more energy per photon?
A) red light B) blue light C) both the same
A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. The bullet to hit the ground first is
A) the dropped one. B) the fired one. C) both hit at the same time