Essential University Physics: Volume 1 (3rd Edition)
3rd Edition
ISBN: 9780321993724
Author: Richard Wolfson
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 73P
Two masses are joined by a massless string. A 30-N force applied vertically to the upper mass gives the system a constant upward acceleration of 3.2 m/s2. If the string tension is 18 N, what are the two masses?
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Two blocks each of mass m = 3.50 kg are fastened to the top of an elevator as in Figure P4.56.
(a) If the elevator has an upward acceleration a=1.60 m/s2 , find the tensions T1 and T2 in the upper and lower strings.
(b) If the strings can withstand a maximum tension of 85.0 N, what maximum acceleration can elevator have before the upper string breaks?
A box of mass m1 =10.0 kg rests on a smooth , horizontal floor next to a box m2=5.00 kg if you push on a box 1 with horizontal force of magnitude F = 20.0 N what is the acceleration of the boxes?what is the force of contact between the boxes?
What is the resulting acceleration when an unbalanced force of 100.0 N is
applied to a 5.00 kg object?
a. 0.05 m/s^2
c. 105 m/s^2
b. 20 m/s^2
d. 500 m/s^2
Chapter 4 Solutions
Essential University Physics: Volume 1 (3rd Edition)
Ch. 4.2 - A curved barrier lies on a horizontal tabletop, as...Ch. 4.2 - A nonzero net force acts on an object. Which of...Ch. 4.4 - A popular childrens book explains the...Ch. 4.5 - For each of the following situations, would the...Ch. 4.6 - The figure shows two blocks with two forces acting...Ch. 4.6 - (1) Would the answer to (a) in Example 4.5 change...Ch. 4 - Distinguish the Aristotelian and Galilean/New...Ch. 4 - A ball bounces off a wall with the same speed it...Ch. 4 - We often use the term inertia to describe human...Ch. 4 - Does a body necessarily move in the direction of...
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- The coefficient of static friction between the 3.00-kg crate and the 35.0 incline of Figure P4.31 is 0.300. What minimum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline? Figure P4.31arrow_forwardTwo blocks, each of mass m = 3.50 kg, are hung from the ceiling of an elevator as in Figure P4.33. (a) If the elevator moves with an upward acceleration a of magnitude 1.60 m/s2, find the tensions T1 and T2 in the upper and lower strings. (b) If the strings can withstand a maximum tension of 85.0 N, what maximum acceleration can the elevator have before a string breaks? Figure P4.33 Problems 33 and 34.arrow_forward(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 P4.74arrow_forward
- (a) What is the resultant force exerted by the two cables supporting the traffic light in Figure P4.75? (b) What is the weight of the light? Figure P4.75arrow_forwardTwo blocks of mass 3.50 kg and 8.00 kg are connected by a massless string that passes over a frictionless pulley (Fig. P4.47). The inclines are frictionless. Find (a) the magnitude of the acceleration of each block and (b) the tension in the string. Figure P4.47arrow_forwardA fisherman is fishing from a bridge and is using a "30.0-N test line." In other words, the line will sustain a maximum force of 30.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in (a) at constant speed and (b) with an acceleration whose magnitude is 2.16 m/s2?arrow_forward
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- A 82.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.92 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.44 m/s2?arrow_forwardA 75 kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 825 N. What is the acceleration of the elevator?arrow_forwardThe cable supporting a 2165 kg elevator has a maximum strength of 24070 N . What maximum upward acceleration can it give the elevator without breaking (in m/s2) ?arrow_forward
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