A car of mass 1689 kg collides head-on with a parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic
If the velocity of the truck is 17 km/h (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car?
A) 19 km/h
B) 38 km/h
C) 29 km/h
D) 10 km/h
Answer: A
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Moment of Inertia: A triatomic molecule is oriented as follows along the x-axis: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. What is the moment of inertia of this molecule about the y-axis?
A. 2ma2 B. 3ma2 C. 12ma2 D. 14ma2
These are found on the side of the Moon that faces Earth, but not on the far side
A) Highlands B) Maria C) Craters D) Mountains E) Valleys
The difference between donor and acceptor atoms in a doped semiconductor is that
a. the donor energy level lies halfway between the valence band and the acceptor level. b. the donor energy level lies near the valence band and the acceptor energy level lies near the conduction band. c. donor energy levels cannot exist unless acceptor energy levels are present. d. the donor energy level lies near the conduction band and the acceptor energy level lies near the valence band. e. the acceptor energy level lies halfway between the conduction band and the donor energy level.
You have a covered pot on a stove and you turn the heat on. If you assume that the pot and lid combination leaks, what can be said about the pressure, the volume and the amount of air within the pot on the stove after the heat is turned on compared to before the heat is turned on? Ignore changes in the size of the pot associated with the thermal expansion of the pot itself
1.After the heat is turned on, the pressure within the pot is greater than it was before, the volume is the same, and the amount of air is less. 2.After the heat is turned on, the pressure within the pot is less than it was before, the volume is the same, and the amount of air is the same. 3.After the heat is turned on, the pressure within the pot is the same, the volume is the same, and the amount of air is less. 4.After the heat is turned on, the pressure within the pot is the same, the volume of air is less, and the amount of air is less.