A ball drops some distance and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball gain?
A) more than 30 J
B) exactly 30 J
C) less than 30 J
D) Cannot be determined from the information given.
C
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An M star is hotter than an O star
a. True b. False Indicate whether the statement is true or false
An ambulance with its siren on is heading due east along a straight road at 60 mph. A car is also moving along the same road. In which case will the driver of the car perceive the frequency of the siren to be lowest?
a. The car is moving east at 65 mph and is behind the ambulance b. The car is moving west at 65 mph and is behind the ambulance. c. The car is moving east at 65 mph and is in front of the ambulance. d. The car is moving west at 65 mph and is in front of the ambulance.
During the June solstice, the Sun rises in the southeast horizon in Earth's Northern Hemisphere.
Answer the following statement true (T) or false (F)
Evacuated Magdeburg hemispheres are each
A) sucked together. B) pushed together by the atmosphere. C) held together by tension.