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Chapter 4: Q5. (page 100)
What causes the boat in Fig. 4-41 to move forward?
(a) The force that the man exerts on the paddle
(b) The force that the paddle exerts on the water
(c) The force that the water exerts on the paddle
(d) The motion of the water itself
The correct option is (c).
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For the system of Fig. 4–32 (Example 4–20), how large a mass would box A have to have to prevent any motion from occurring? Assume.
FIGURE 4-32 Example 4–20.
A skateboarder, with an initial speed ofrolls virtually friction free down a straight incline of length 18 m in 3.3 s. At what angle is the incline oriented above the horizontal?
Question: (II) The block shown in Fig. 4–59 has massand lies on a fixed, smooth, frictionless plane tilted at an angle ofto the horizontal. (a) Determine the acceleration of the block as it slides down the plane. (b) If the block starts from rest at 12.0 m above the plane from its base, what will be the block's speed when it reaches the bottom of the incline?
Three blocks on a frictionless horizontal surface are in contact with each other, as shown in Fig. 4–54. A forceis applied to block A (mass mA). (a) Draw a free-body diagram for each block. Determine (b) the acceleration of the system (in terms of mA, mB, and mC), (c) the net force on each block, and (d) the force of contact that each block exerts on its neighbor. (e) If,and,give numerical answers for (b), (c), and (d). Explain how your answers make sense intuitively.
FIGURE 4-54 Problem 34
The two forcesand, as shown in Fig. 4–52 (a) and (b), (looking down) act on an 18.5 kg object on a frictionless tabletop. If,and, find the net force on the object and its acceleration for (a) and (b).
FIGURE 4-52 Problem 28.
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