7. The coefficient of kinetic friction between block A and the table is 0.20. Also, mi = 25 kg. m2 = 15 kg. How far will block B drop in the first 3.0 sec after the system is released? m, How large a horizontal force in addifion of T must pull on Block A to give it an acceleration of 0.75 m/s? toward the left? Assume H = 0.20, mi = 25 kg, m2 = 15 kg.

7. The coefficient of kinetic friction between block A and the table is 0.20. Also, mi = 25 kg. m2 = 15 kg. How far will block B drop in the first 3.0 sec after the system is released? m, How large a horizontal force in addifion of T must pull on Block A to give it an acceleration of 0.75 m/s? toward the left? Assume H = 0.20, mi = 25 kg, m2 = 15 kg.

Name: 7. The coefficient of kinetic friction between block A and the table
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Description: 7. The coefficient of kinetic friction between block A and the table is 0.20. Also, mi = 25 kg.m2 = 15 kg. How far will block B drop in the first 3.0 sec after the system is released?m,How large a horizontal force in addifion of T must pull on Block

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 17P: (a) Find the tension in each cable supporting the 6.00 102-N cat burglar in Figure P4.35. (b)...

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(a) If the rocket sled shown in Figure 4.32 starts with only one rocket burning, what is the magnitude of its acceleration? Assume that the mass of the system is 2100 kg, the thrust T is 2.4104 N, and the force of friction opposing the motion is known to be 650 N. (b) Why is the acceleration not one-fourth of what it is with all rockets burning?
(a) What is the minimum force of friction required to hold the system of Figure P4.74 in equilibrium? (b) What coefficient of static friction between the 100.-N block and the table ensures equilibrium? (c) If the coefficient of kinetic friction between the 100.-N block and the table is 0.250, what hanging weight should replace the 50.0-N weight to allow the system to move at a constant speed once it is set in motion? Figure P4.74
(a) Find the tension in each cable supporting the 6.00 102-N cat burglar in Figure P4.35. (b) Suppose the horizontal cable were reattached higher up on the wall. Would the tension in the other cables increase, decrease, or stay the same? Why? Figure P4.35
(a) What force causes an automobile to move? (b) A propeller-driven airplane? (c) A rowboat?
Two forces are applied to a car in an effort to move it, as shown in Figure P4.12. (a) What is the resultant vector of these two forces? (b) If the car has a mass of 3 000 kg, what acceleration does it have? Ignore friction. Figure P4.12
What forces cause (a) an automobile, (b) a propeller-driven airplane, and (c) a rowboat to move?
. A person stands on a scale inside an elevator at rest (Figure 2.54). The scale reads 800 N. (a) What is the person's mass? (b) The elevator accelerates upward momentarily at the rate of 2 m/s2. What does the scale read then? (c) The elevator then moves with a steady speed of 5 m/s. What does the scale read now?
A crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P4.83. The coefficient of static friction is s, and P is directed at angle below the horizontal. (a) Show that the minimum value of P that will move the crate is given by P=sFgsec1stan (b) Find the condition on in terms of , for which motion of the crate is impossible for any value of P. Figure P4.83
Consider the 65.0-kg ice skater being pushed by two others shown in Figure 5.21. (a) Find the direction and magnitude of Ftot, the total force exerted on her by the others, given that the magnitudes F1and F2are 26.4 N and 18.6 N, respectively. (b) What is her initial acceleration if she is initially stationary and wearing steel-bladed skates that point in the direction of Ftot? (c) What is her acceleration assuming she is already moving in the direction of Ftot? (Remember that friction always acts in the direction opposite that of motion or attempted motion between surfaces in contact.)
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A person doing a chin-up weighs 700 N, exclusive of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 355 N on the torso. If the upward movement starts from rest, what is the persons velocity at that point?
. On aircraft carriers, catapults are used to accelerate jet aircraft to flight speeds in a short distance. One such catapult takes a 18.000-kg jet from 0 to 70 m/s in 2.5 s. (a) What is the acceleration of the jet (in m/s2 and g’s)? (b) How far dues the jet travel while it is accelerating? (C) How large is the force that the catapult must exert on the jet?