An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. How much mechanical energy is required to increase the temperature of 200 g of water (enough for 1 cup of coffee) from 18°C to 94°C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg/°C)
a. 6.4E+4 J
b. 3.2E+4 J
c. 1.6E+4 J
d. 1.0E+3 J
e. 1.5E+1 J
a
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The Lorentz factor, ?,
A) is always greater than 1 for any speed greater than zero. B) lets the time-dilation equation be expressed t = ? t0. C) both of these D) none of these
Jupiter completes one revolution about its own axis every 9.92 hours. What is the radius of the orbit required for a satellite to revolve about Jupiter with the same period? Jupiter has a mass of 1.90 × 1027 kg and G = 6.67 × 10-11 N ? m2/kg2
A) 1.04 × 107 m B) 2.26 × 109 m C) 1.60 × 108 m D) 3.41 × 108 m E) 7.45 × 108 m
The resistance of a wire does not change when its temperature changes
Indicate whether the statement is true or false
The Alps are examples of which type of mountain?
a. Fold b. Volcanic c. Fault-block d. None of these