Q: A garage door is mounted on an overhead rail (Fig.
A garage door is mounted on an overhead rail (Fig. P11.79). The wheels at A and B have rusted so that they do not roll, but rather slide along the track. The coefficient of kinetic friction is 0.52. T...
See AnswerQ: Ancient pyramid builders are balancing a uniform rectangular slab of stone tipped
Ancient pyramid builders are balancing a uniform rectangular slab of stone tipped at an angle u above the horizontal using a rope (Fig. P11.80). The rope is held by five workers who share the force eq...
See AnswerQ: A 12.0-kg mass, fastened to the end
A 12.0-kg mass, fastened to the end of an aluminum wire with an un stretched length of 0.70 m, is whirled in a vertical circle with a constant angular speed of 120 rev/min. The cross-sectional area of...
See AnswerQ: A wire of length l0 and cross-sectional area A supports
A wire of length l0 and cross-sectional area A supports a hanging weight W. (a) Show that if the wire obeys Eq. (11.7), it behaves like a spring of force constant AY/l0, where Y is Young’s modulus for...
See AnswerQ: A 1.05-m-long rod of negligible weight
A 1.05-m-long rod of negligible weight is supported at its ends by wires A and B of equal length (Fig. P11.83). The cross-sectional area of A is 2.00 mm2 and that of B is 4.00 mm2. Youngâ&...
See AnswerQ: An amusement park ride consists of airplane-shaped cars attached to
An amusement park ride consists of airplane-shaped cars attached to steel rods (Fig. P11.84). Each rod has a length of 15.0 m and a cross-sectional area of 8.00 cm2. (a) How much is each rod stretched...
See AnswerQ: The compressive strength of our bones is important in everyday life.
The compressive strength of our bones is important in everyday life. Young’s modulus for bone is about 1.4 × 1010 Pa. Bone can take only about a 1.0% change in its length before fracturing. (a) What i...
See AnswerQ: You are to use a long, thin wire to build a
You are to use a long, thin wire to build a pendulum in a science museum. The wire has an un stretched length of 22.0 m and a circular cross section of diameter 0.860 mm; it is made of an alloy that h...
See AnswerQ: You need to measure the mass M of a 4.00
You need to measure the mass M of a 4.00-mlong bar. The bar has a square cross section but has some holes drilled along its length, so you suspect that its center of gravity isnât in...
See AnswerQ: You are a construction engineer working on the interior design of a
You are a construction engineer working on the interior design of a retail store in a mall. A 2.00-m-long uniform bar of mass 8.50 kg is to be attached at one end to a wall, by means of a hinge that a...
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