Which method of fueling your car is likely to be more energy efficient, and why: gasoline used in a standard car engine or electricity taken from a coal-fueled generating plant and stored in lightweight car batteries? Assume that the batteries
convert electricity to work at 100% efficiency, and that electricity is transported from the power plant to the car at 100% efficiency.
A) Gasoline used in a standard car engine, because a car engine's fuel burns hotter and more efficiently than does the coal in a coal-fired power plant.
B) Electricity from a coal-fired generating plant, because a car engine is a heat engine, and must follow the second law of thermodynamics, whereas a coal-fired generating plant is not.
C) Gasoline used in a standard car engine, because a car engine burns its fuel directly in the automobile rather than miles away at the power plant.
D) Electricity from a coal-fired generating plant, because such a plant runs at higher energy-efficiency than does a car engine.
E) It wouldn't make any difference, because both the car engine and the generating plant are heat engines and are thus subject to the second law of thermodynamics.
D
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A cable is 50.0 m long and has a diameter of 2.50 cm. A force of 10,000 N is applied to the end of the cable. If the maximum stretch allowed in the cable is 2.00 mm, then what is the minimum tensile modulus allowed?
a. 
b. 
c. 
d. 
e. 
A 1200-kg car whose springs have an effective force constant of 2.66 × 106 N/m is moving along the highway with its tires out of balance. The tires have a radius of 40.6 cm. At what speed will the driver experience large vibrations?
A) 19.1 m/s B) 22.2 m/s C) 18.9 m/s D) 17.4 m/s E) 25.0 m/s
_________________ are mainstays of local public health departments. Individuals like John Snow who focus on the outbreak of a disease in a community and try to control the spread of infectious diseases.
What will be an ideal response?
Two parallel straight wires carry currents in the same direction. The magnetic forces between the wires are such that
A) the wires feel a clockwise torque. B) they are pulled in the direction of the wires. C) the wires repel each other. D) the wires attract each other.