Momentum: A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces. It rebounds with an upward velocity of 1.00 m/s. What is the change of the ball's momentum during the bounce?
A. 0.0280 kg ? m/s upwards
B. 0.0280 kg ? m/s downwards
C. 0.308 kg ? m/s upwards
D. 0.308 kg ? m/s downwards
E. 0.000 kg ? m/s
Answer: C
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A Styrofoam cooler has a surface area of 2,700 cm2 and a wall thickness of 3.0 cm. Styrofoam has a coefficient of thermal conductivity of 0.01 W/m C. A 2.0 kg block of ice is placed inside the cooler that has a temperature inside of 2.0
If the heat of fusion for ice is 333.7 kJ/kg and the temperature outside is 35.0
then how long will the ice last?
A. 74 hours B. 62 hours C. 55 hours D. 42 hours E. 24 hours
Some regions along the plane of the Milky Way appear dark because
A) there are no stars in these areas. B) stars in that region are hidden by interstellar gas. C) stars in that region are hidden by dark dust particles. D) many brown dwarfs in those areas absorb light which they turn into heat. E) many black holes absorb all light from those directions.
If you are driving at 30 miles per hour and increase your speed to 60 miles per hour, you quadruple your kinetic energy
Indicate whether the statement is true or false
A solenoid having N turns and carrying a current of 2.000 A has a length of 34.00 cm. If the magnitude of the magnetic field generated at the center of the solenoid is 9.000 mT, what is the value of N? (?0 = 4? × 10-7 T • m/
A) A) 860.0 B) 1591 C) 2318 D) 3183 E) 1218