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Chapter 6: Q57P (page 144)
A puck of mass slides in a circle of radiuson a frictionless table while attached to a hanging cylinder of massby means of a cord that extends through a hole in the table (Fig. 6-43). What speed keeps the cylinder at rest?
The speed that keeps the cylinder at rest is .
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A worker pushes horizontally on a crate with a force of magnitude . The coefficient of static friction between the crate and the floor is . (a) What is the value of under the circumstances? (b) Does the crate move? (c) What is the frictional force on the crate from the floor? (d) Suppose, next, that a second worker pulls directly upward on the crate to help out. What is the least vertical pull that will allow the first worker鈥檚 push to move the crate? (e) If, instead, the second worker pulls horizontally to help out, what is the least pull that will get the crate moving?
Figure 6-32 shows three crates being pushed over a concrete floor by a horizontal force of magnitude . The masses of the crates are , , and .The coefficient of kinetic friction between the floor and each of the crates is . (a) What is the magnitude of the force on crate 3 from crate 2? (b) If the crates then slide onto a polished floor, where the coefficient of kinetic friction is less than , is magnitude more than, less than, or the same as it was when the coefficient was ?
A block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of . Figure 6-30 gives the block鈥檚 speed versus time as the block moves along an axis on the floor. The scale of the figure鈥檚 vertical axis is set by . What is the coefficient of kinetic friction between the block and the floor
Calculate the magnitude of the drag force on a missile 53 cmin diameter cruising at 250 m/sat low altitude, where the density of air is. Assume.
In Fig. 6-15, a horizontal force of 100Nis to be applied to a 10kg slab that is initially stationary on a frictionless floor, to accelerate the slab. A 10kg block lies on top of the slab; the coefficient of friction between the block and the slab is not known, and the block might slip. In fact, the contact between the block and the slab might even be frictionless. (a) Considering that possibility, what is the possible range of values for the magnitude of the slab鈥檚 accelerationlocalid="1657173176346" ? (Hint:You don鈥檛 need written calculations; just consider extreme values for m.) (b) What is the possible range for the magnitudelocalid="1657173167508" of the block鈥檚 acceleration?
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