Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground?
a. 28 m/s
b. 14 m/s
c. 20 m/s
d. 40 m/s
e. 780 m/s
a
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Which of these statements is true?
a. a battery produces ac and a generator produces dc b. a battery and a generator produce ac c. a battery and a generator produce dc d. a battery produces dc and a generator produces ac
Transverse seismic body waves are known by the letter ______________
a. B b. P c. S d. T
If you toss a coin straight upward in train that slows while the coin is in the air, the coin will land
A) as if you were at rest. B) in front of you. C) in back of you.
200 g of ice at 0°C is dropped into a calorimeter of negligible heat capacity containing 350 g of water at 20°C. What is the temperature of the system when it reaches equilibrium? The latent heat of fusion of water is 80 cal/g
A) 0°C B) 24°C C) -13°C D) 13°C E) -24°C