Chapter 4: Q21CQ (page 160)
If a leg is suspended by a traction setup as shown in Figure 4.30, what is the tension in the rope?
The tension in the rope is equal to the weight of the leg.
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How are inertia and mass related?
A rock is thrown straight up. What is the net external force acting on the rock when it is at the top of its trajectory?
Integrated Concepts
An elevator filled with passengers has a mass of 1700 kg.
(a) The elevator accelerates upward from rest at a rate of 1.20 m/s2 for 1.50 s. Calculate the tension in the cable supporting the elevator.
(b) The elevator continues upward at constant velocity for 8.50 s. What is the tension in the cable during this time?
(c) The elevator decelerates at a rate of 0.600 m/s2 for 3.00 s. What is the tension in the cable during deceleration?
(d) How high has the elevator moved above its original starting point, and what is its final velocity?
Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of 75.0 N, the second a force of 90.0 N, friction is 12.0 N, and the mass of the third child plus wagon is 23.0 kg.
(a) What is the system of interest if the acceleration of the child in the wagon is to be calculated?
(b) Draw a free-body diagram, including all forces acting on the system.
(c) Calculate the acceleration.
(d) What would the acceleration be if friction were 15.0 N?
(a) Find the magnitudes of the forces F1 and F2 that add to give the total force Ftot shown in Figure 4.35. This may be done either graphically or by using trigonometry.
(b) Show graphically that the same total force is obtained independent of the order of addition of F1and F2 .
(c) Find the direction and magnitude of some other pair of vectors that add to give Ftot . Draw these to scale on the same drawing used in part (b) or a similar picture.
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