An automobile engine operates with an overall efficiency of 12%. How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned?
a. 1.2
b. 8.8
c. 6.5
d. 4.7
e. 7.5
b
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A flat square coil of wire measures 9.5 cm on each side and contains 175 turns of very thin wire. It carries a current of 6.3 A in a uniform 0.84-T magnetic field
What angle less than 90° should the plane of this coil make with the magnetic field direction so that the magnitude of the magnetic torque on it is 6.5 N ? m?
_____ is the site of most of the star formation in the Milky Way Galaxy
A) The disk component B) The spherical component C) The central bulge D) A large halo
An air sample is contaminated with 15O, which has a half-life of 2.03 min. One possible way to minimize its hazard is to pass it through a long pipe to allow it to decay inside the pipe until it can be safely released into the atmosphere
If the oxygen moves at a speed of 1.1 m/s in the pipe, how long must the pipe be for the sample to have decayed to 3.0% of its original activity just as it leaves the pipe? A) 680 m B) 8.0 m C) 7.0 m D) 2.0 m
When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be:
A) longer than when they are at rest. B) the same length as when they are at rest. C) shorter than when they are at rest. D) narrower than when they are at rest. E) wider than when they are at rest.