A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would reach the summit in ____ seconds
a. 1
b. 460
c. 500
d. 1 000
e. 35 000
b
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The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. field strength c. both A and B b. current strength d. None of the above are valid.
When water freezes, it expands about nine percent. What would be the pressure increase inside your automobile engine block if the water in there froze? The bulk modulus of ice is 2.0 × 10^9 N/m2, and 1 atm= 1.01 × 10^5 N/m2
a. 18 atm b. 360 atm c. 1100 atm d. 1600 atm e. 600 atm
Which of the following choices is an appropriate unit for measuring entropy changes?
a. J • K c. J/s b. N • K d. J/K
Equilibrium: A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N object is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center. A second object, with a weight of 15 N, is placed on the supported end. What magnitude forces do the sawhorses exert on the board?
What will be an ideal response?