1. A tightrope walker with mass 50 kg stands on a taught rope such that the rope makes a 10degree angle to the horizontal on each side of the walker. What is the tension in the rope?Optional Answers:1. 1440 N2. 144 N3. 250 N4. 500 N2. One end of a 1-m-long spring is attached to the ceiling. When a 20 kg mass is attached to theother end the spring is stretched to 2.5 m. What is the spring constant?Optional Answers:1. 200 N2. 80 N/m3. 13.3 N/m4. 133 N/m3. The mass is removed from the 1-m-long spring in the previous problem and replaced with a 50 kgmass. What is the new length of the spring?Optional Answers:1. 4.75 m2. 2.5 m3. 3.75 m4. 1 m4. Copper wire with diameter 1 cm and unstretched length 20 m is stretched by a 5000 N tensionforce. By how much is the wire stretched? The Young's modulus of copper is 128x10^9N/m^2Optional Answers:1. 1.0 cm2. 0.5 mm3. 20.01 m4. 2.5 mm

1. given mass of walker m=50kg angle θ=10

1. A tightrope walker with mass 50 kg stands on a taught rope such that the rope makes a 10 degree angle to the horizontal on each side of the walker. What is the tension in the rope? Optional Answers: 1. 1440 N 2. 144 N 3. 250 N 4. 500 N

1. A tightrope walker with mass 50 kg stands on a taught rope such that the rope makes a 10 degree angle to the horizontal on each side of the walker. What is the tension in the rope? Optional Answers: 1. 1440 N 2. 144 N 3. 250 N 4. 500 N

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter5: The Laws Of Motion

Section: Chapter Questions

Problem 5.44P: Two blocks, each of mass m, are hung from the ceiling of an elevator as in Figure P5.43. The...

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1. A large wrecking ball is held in place by two light steel cables as shown in the figure. If the mass m of the wrecking ball is 4200 kg, what are the tensions TB in the cable that makes an angle of 40° with the vertical and the tension TA in the horizontal cable? 2. If M = 1.5 kg, what are the tensions in string 1 and string 2?
(II) (a) What is the maximum tension possible in a1.00-mm-diameter nylon tennis racket string? (b) If youwant tighter strings, what do you do to prevent breakage:use thinner or thicker strings? Why? What causes stringsto break when they are hit by the ball?
A 0.400-kg pendulum bob passes through the lowest part of its path at a speed of 3.00 m/s. (a) What is the tension in the pendulum cable at this point if the pendulum is 80.0 cm long? (b) When the pendulum reaches its highest point, what angle does the cable make with the vertical? (c) What is the tension in the pendulum cable when the pendulum reaches its highest point?
(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 setup similar to the one shown in Figure P5.38 is often used in hospitals to support and apply a horizontal traction force to an injured leg. (a) Determine the force of tension in the rope supporting the leg. (b) What is the traction force exerted to the right on the leg?
Two identical strings making an angle of = 30.0 with respect to the vertical support a block of mass m = 15.0 kg (Fig. P4.32). What is the tension in each of the strings?
This problem returns to the tightrope walker studied in Example 4.6, who created a tension of 3.94103 N in a wire making an angle 5.0° below the horizontal with each supporting pole. Calculate how much this tension stretches the steel wire if it was originally 15 m long and 0.50 cm in diameter.
Measuring coefficients of friction A coin is placed near one edge of a book lying on a table, and that edge of the book is lifted until the coin just slips down the incline as shown in Figure P4.82. The angle of the incline, C, called the critical angle, is measured. (a) Draw a free-body diagram for the coin when it is on the verge of slipping and identify all forces acting on it. Your free-body diagram should include a force of static friction acting up the incline. (b) Is the magnitude of the friction force equal to sn for angles less than C? Explain. What can you definitely say about the magnitude of the friction force for any angle c? (c) Show that the coefficient of static friction is given by s = tan c. (d) Once the coin starts to slide down the incline, the angle can be adjusted to a new value c c such that the coin moves down the incline with constant speed. How does observation enable you to obtain the coefficient of kinetic friction? Figure P4.82
Suppose a 60.0-kg gymnast climbs a rope. (a) What is the tension in the rope if he climbs at a constant speed? (b) What is the tension in the rope if he accelerates upward at a rate of 1.50 m/s2?
Suppose you have a 120-kg wooden crate resting on a wood floor. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will the magnitude of its acceleration then be?
In the Atwood machine discussed in Example 5.9 and shown in Figure 5.14a, m1 = 2.00 kg and m2 = 7.00 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction, and the siring does not stretch. The lighter object is released with a sharp push that sets it into motion at i = 2.40 m/s downward. (a) How far will m1, descend below its initial level? (b) Find the velocity of m1 after 1.80 s.
The systems shown in Figure P4.58 are in equilibrium. If the spring scales are calibrated in newtons, what do they read? Ignore the masses of the pulleys and strings and assume the pulleys and the incline in Figure P4.58d are frictionless. Figure P4.58