In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s. How long does it take for the train to be 180 m ahead of the car?
a. 2.0 s
b. 3.0 s
c. 6.0 s
d. 9.0 s
e. 18.0 s
c
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A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
a. ?14 J b. ?12 J c. ?10 J d. ?16 J e. ?25 J
A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 80,000 kg, the next one, 50,000 kg, and the last one, 70,000 kg. Neglect friction
What is the force between the 80,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 50,000 N D) 60,000 N E) 65,000 N
Lithium is a good material to use for a possible fusion reactor because it is so easy to handle chemically
What will be an ideal response?