Figure 7-21a shows four situations in which a horizontal force acts on the same block, which is initially at rest. The force magnitudes are F 2 = F 4 = 2 F 1 = 2 F 3 . The horizontal component v x of the block’s velocity is shown in Fig. 7-21 b for the four situations. (a) Which plot in Fig. 7-21 b best corresponds to which force in Fig. 7-21 a? (b) Whichplot in Fig. 7-21 c (for kinetic energy K versus time t ) best corresponds to which plot in Fig. 7-21 b? Figure 7-21 Question 8.
Figure 7-21a shows four situations in which a horizontal force acts on the same block, which is initially at rest. The force magnitudes are F 2 = F 4 = 2 F 1 = 2 F 3 . The horizontal component v x of the block’s velocity is shown in Fig. 7-21 b for the four situations. (a) Which plot in Fig. 7-21 b best corresponds to which force in Fig. 7-21 a? (b) Whichplot in Fig. 7-21 c (for kinetic energy K versus time t ) best corresponds to which plot in Fig. 7-21 b? Figure 7-21 Question 8.
Figure 7-21a shows four situations in which a horizontal force acts on the same block, which is initially at rest. The force magnitudes are F2 = F4 = 2F1 = 2F3. The horizontal component vx of the block’s velocity is shown in Fig. 7-21b for the four situations. (a) Which plot in Fig. 7-21b best corresponds to which force in Fig. 7-21a? (b) Whichplot in Fig. 7-21c (for kinetic energy K versus time t) best corresponds to which plot in Fig. 7-21b?
A small block of mass m = 3.00 kg starts from rest and slides down a rough 30.0° incline from a height of h=3.60m. The coefficient of kinetic friction between the block and the incline is μk = 0.20. At the bottom it strikes a big block of mass M = 12.0kg, which is at rest on a horizontal frictionless surface. The collision is elastic.
A baseball (m = 152 g) approaches a bat horizontally at a speed of 43.6 m/s (97.6 mi/h) and is hit straight back at a speed of 53.8 m/s (120 mi/h). If the ball is in contact with the bat for a time of 1.03 ms, what is the average force exerted on the ball by the bat? Neglect the weight of the bat, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.
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A pendulum of length L = 1.0 meter and bob of mass m = 1.0 kg is released from rest at an angle θ = 30 degrees. When the pendulum reaches the vertical position, the bob strikes a cube with mass M = 3.0 kg that is resting on a frictionless table of height h = 0.85 m.
d. Determine how far away from the bottom edge of the table, Δx, the cube will strike the floor
e. At the location where the cube would have struck the floor, there is now a small cart of mass M = 3.0 kg and negligible height. The cube lands on the cart, and sticks to the cart in a completely *inelastic* collision. Ignore friction. Calculate the horizontal velocity of the cart just after the cube lands on it.
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