A typical automobile consumes about 70 kW of power from the gas tank. How many 100-watt light bulbs could this light up, if the energy were used to light electric bulbs rather than to run the car?
A) 7 bulbs
B) 700 bulbs
C) 7000 bulbs
D) 70 bulbs
E) This question cannot be answered without knowing the amount of time the car is being driven at this power.
B
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Elastic Collisions: A block of mass m = 3.6 kg, moving on a frictionless surface with a speed vi = 9.3 m/s, makes a sudden perfectly elastic collision with a stationary block of mass M, as shown in the figure. Just after the collision, the 3.6-kg block recoils with a speed of vf = 2.7 m/s. What is the speed V of the other block?
A. 6.6 m/s B. 8.0 m/s C. 9.3 m/s D. 10.7 m/s E. 12.0 m/s
In brittle materials, the easiest way to increase the _________strength is to decrease the size of cracks and pores.
Fill in the blank(s) with the appropriate word(s).
A train moves down the track toward an observer. The sound from the train, as heard by the observer, is ___ the sound heard by a passenger on the train:
a) the same as b) a different timbre than c) higher in pitch than d) lower in pitch than
Motional Emf: As shown in the figure, a metal bar is in contact with a pair of metal parallel rails. A steady uniform magnetic field B, perpendicular to the plane of the rails and pointing outward from the page, is present. The bar is in downward motion with velocity of magnitude ?. The direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.