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Chapter 9: Q. 2 (page 227)
Particle A has half the mass and eight times the kinetic energy of particle B. What is the speed ratio vA/vB?
Ratio of speed vA/vB= 4
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The cable of a crane is lifting a kg girder. The girder increases its speed from m/s to m/s in a distance of m.
a. How much work is done by gravity?
b. How much work is done by tension?
A 20 g particle is moving to the left at 30 m/s. A force on the particle causes it to move the the right at 30 m/s. How much work is done by the force?
How much energy is consumed by
(a) a kW hair dryer used for min and
(b) a W night light left on for h?
An elevator held by a single cable is ascending but slowing down. Is the work done by tension positive, negative, or zero? What about the work done by gravity? Explain.
A -cm-long vertical spring has one end fixed on the floor. Placing a kg physics textbook on the spring compresses it to a length of cm. What is the spring constant?
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