Suppose you have a 115-kg wooden crate resting on a wood floor. (For each answer, enter a number. u, = 0.3 and u, = 0.5) (a) What maximum force (in N) can you exert horizontally on the crate without moving it? (b) If you continue to exert this force (in m/s2) once the crate starts to slip, what will the magnitude of its acceleration (in m/s2) then be? m/s2

Suppose you have a 115-kg wooden crate resting on a wood floor. (For each answer, enter a number. u, = 0.3 and u, = 0.5) (a) What maximum force (in N) can you exert horizontally on the crate without moving it? (b) If you continue to exert this force (in m/s2) once the crate starts to slip, what will the magnitude of its acceleration (in m/s2) then be? m/s2

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 33P: Two blocks, each of mass m = 3.50 kg, are hung from the ceiling of an elevator as in Figure P4.33....

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Two blocks each of mass m are fastened to the top of an elevator as in Figure P4.56. The elevator has an upward acceleration a. The strings have negligible mass, (a) Find the tensions T1 and T2 in the upper and lower strings in terms of m, a, and g. (b) Compare the two tensions and determine which string would break first if a is made sufficiently large. (c) What are the tensions if the cable supporting the elevator breaks? Figure P4.56
The helicopter view in Fig. P3.15 shows two people pulling on a stubborn mule. The person on the right pulls with a force F1 of magnitude 120 X and direction of 1 = 60.0. The person on the left pulls with a force F2 of magnitude 80.0 N and direction of 2 = 75.0. Find (a) the single force that is equivalent to the two forces shown and (b) the force that a third person would have to exert on the mule to make the resultant force equal to zero. The forces are measured in units of newtons (symbolized N). Figure P3.15
Two 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.
Suppose you have a 104-kg wooden crate resting on a wood floor. (For each answer, enter a number. ?k = 0.3 and ?s = 0.5) What maximum force (in N) can you exert horizontally on the crate without moving it?_____ If you continue to exert this force (in m/s2) once the crate starts to slip, what will the magnitude of its acceleration (in m/s2) then be?_______
A box with a mass of (18.2 + A) kg is pulled across a floor using a horizontal force of (48.1 + B) N. If there is a friction force of (24.2 + C) N between the box and the floor, what is the acceleration of the box? Calculate the answer in m/s2 and rounded to three significant figures. A=8 B= 78 C=20
If a net horizontal force of 132 N is applied to a person with mass 60 kg who is resting on the edge of a swimming pool, what horizontal acceleration is produced? 2.2 m/s^2 No answer 22.2 m/s^2 29.20 m/s^2 7920 m/s^2
An elevator weighing 5.8 KN is ascending with an acceleration of 3m/s2. The operator is standing on a scale inside the elevator and during ascension the scale registers 910 N. What is the true weight of the operator in kg and the tension in the supporting cable?
Two weights, each weighing m, are hung over a pulley. If an additional weight of 100 g is attached to one of the weights, it is lowered by 564 cm in the first 2.00 s. What is the mass m? What was the force of the rope before adding the new weight? What is the force of the rope after adding the new weight? (The solutions are 124 g, 1.22 N, 1.57 N)
Two blocks each of mass m=3.21 kg are fastened to the top of an elevator as in the figure. (A) if the elevator has an upward acceleration a= 1.60 m/s^2 , find the tensions T1 and T2 in the upper and lower strings. T1 = N. T2= N (B) if the strings can withstand a maximum tension of 89.0 N what maximum acceleration can the elevator have before the upper strings breaks? M/s2 ?
Three blocks, with mass m1 = m2 = m3 = 2 kg, are suspended from the ceiling of an elevator as shown in the figure. If the elevator moves with an upward acceleration of magnitude 3 m/s2 (a) What is the tension in the string T3? (b) What is the tension in the string T2? (c) If all strings can withstand the maximum tension of 90 N, whatmaximum acceleration can the elevator have before a stringbreaks? (Hint: think about which string will break first).
A particle of mass 4.00 kg, moving on a horizontal table top, has an acceleration vector (in m/s2) given by a =9.10ı^ + 1.80ȷ^, where ı^ and ȷ^ are the unit vectors along the x and y axes, respectively. This particle is subjected to two horizontal forces, expressed in newtons by F⃗ 1=2.00ı^ + 3.00ȷ^ and F2. Calculate the force F2 in newtons. Give your answer to one decimal place
A block of mass m1 = 38.4 kg on a horizontal surface is connected to a mass m2 = 15.2 kg that hangs vertically as shown in the figure below. The two blocks are connected by a string of negligible mass passing over a frictionless pulley. Assume that the horizontal surface is smooth. a) What is the acceleration (in m/s2) of the hanging mass? (Enter the magnitude only.) b) Determine the tension (in N) in the cord. (Enter the magnitude only.)