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Chapter 9: Q. 38 (page 228)
How much energy is consumed by
(a) a kW hair dryer used for min and
(b) a W night light left on for h?
a). Energy consumed by hairdryer J
b). Energy consumed by night lightJ
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A pile driver lifts a weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of drives the pipe in . What is the average force exerted on the pipe?
A sprinter accelerates from rest. Is the work done on the sprinter positive, negative, or zero? Explain
A -cm-long spring is attached to the ceiling. When a kg mass is hung from it, the spring stretches to a length of cm.
a. What is the spring constant?
b. How long is the spring when a 3.0 kg mass is suspended from it?
A mother has four times the mass of her young son. Both are running with the same kinetic energy. What is the ratio vson /vmother of their speeds?
An kg crate is pulled m up a incline by a rope angled above the incline. The tension in the rope is N, and the crate鈥檚 coefficient of kinetic friction on the incline is .
a. How much work is done by tension, by gravity, and by the normal force?
b. What is the increase in thermal energy of the crate and incline?
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