College Physics
7th Edition
ISBN: 9780321601834
Author: Jerry D. Wilson, Anthony J. Buffa, Bo Lou
Publisher: Addison-Wesley
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Chapter 5, Problem 11E
(a)
To determine
The work done by weight of the balloon.
(b)
To determine
The magnitude of work done by buoyant force acting upward.
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A block of mass m₁
=
10.0 kg is connected to a block of mass m₂
34.0 kg by a massless string that passes over a light, frictionless pulley. The 34.0-kg block is connected to a spring that has negligible mass and a force constant of k = 200 N/m as shown in the figure below. The spring is
unstretched when the system is as shown in the figure, and the incline is frictionless. The 10.0-kg block is pulled a distance h = 22.0 cm down the incline of angle = 40.0° and released from rest. Find the speed of each block when the spring is again unstretched.
Vm1
×
1.32
Vm2
= 1.32
×
m/s
m/s
A block of mass m₁ = 10.0 kg is connected to a block of mass m₂ = 34.0 kg by a massless string that passes over a light, frictionless pulley. The 34.0-kg block is connected to a spring that has negligible mass and a force constant of k = 200 N/m as shown in the figure below. The spring is
unstretched when the system is as shown in the figure, and the incline is frictionless. The 10.0-kg block is pulled a distance h = 22.0 cm down the incline of angle 0 = 40.0° and released from rest. Find the speed of each block when the spring is again unstretched.
m/s
Vm1
Vm2
m/s
mi
m2
k
i
Truck suspensions often have "helper springs" that engage at high loads. One such arrangement is a leaf spring with a helper coil spring mounted on the axle, as in the figure below. The helper spring engages when the main leaf spring is compressed by distance yo, and then helps to
support any additional load. Consider a leaf spring constant of 5.45 × 105 N/m, helper spring constant of 3.60 × 105 N/m, and y = 0.500 m.
Truck body
Dyo
Axle
(a) What is the compression of the leaf spring for a load of 4.90 × 105 N?
m
(b) How much work is done compressing the springs?
]
Chapter 5 Solutions
College Physics
Ch. 5 - Prob. 1MCQCh. 5 - Prob. 2MCQCh. 5 - Prob. 3MCQCh. 5 - Work done in free fall (a) is only positive, (b)...Ch. 5 - Which one of the following has units of work: (a)...Ch. 5 - Prob. 6MCQCh. 5 - Which of the following is a scalar quantity: (a)...Ch. 5 - Prob. 8MCQCh. 5 - Prob. 9MCQCh. 5 - Prob. 10MCQ
Ch. 5 - A change in gravitational potential energy (a) is...Ch. 5 - The change in gravitational potential energy can...Ch. 5 - Prob. 13MCQCh. 5 - Prob. 14MCQCh. 5 - Prob. 15MCQCh. 5 - Prob. 16MCQCh. 5 - Prob. 17MCQCh. 5 - If the two springs in Exercise 17 are compressed...Ch. 5 - Prob. 19MCQCh. 5 - Prob. 20MCQCh. 5 - Which of the following is not a unit of power: (a)...Ch. 5 - Consider a 2.0-hp motor and a 1.0-hp motor....Ch. 5 - Prob. 1CQCh. 5 - Prob. 2CQCh. 5 - Prob. 3CQCh. 5 - Prob. 4CQCh. 5 - Prob. 5CQCh. 5 - Prob. 6CQCh. 5 - Prob. 7CQCh. 5 - Prob. 8CQCh. 5 - Prob. 9CQCh. 5 - Prob. 10CQCh. 5 - Prob. 11CQCh. 5 - Prob. 12CQCh. 5 - Prob. 13CQCh. 5 - Prob. 14CQCh. 5 - For a classroom demonstration, a bowling ball...Ch. 5 - Prob. 16CQCh. 5 - Prob. 17CQCh. 5 - If the two springs in Exercise 17 are compressed...Ch. 5 - (a) Does efficiency describe how fast work is...Ch. 5 - Two students who weigh the same start at the same...Ch. 5 - Prob. 1ECh. 5 - Prob. 2ECh. 5 - Prob. 3ECh. 5 - Prob. 4ECh. 5 - Prob. 5ECh. 5 - A father pulls his young daughter on a sled with a...Ch. 5 - A father pushes horizontally on his daughter’s...Ch. 5 - Prob. 8ECh. 5 - Prob. 9ECh. 5 - A crate is dragged 3.0 m along a rough floor with...Ch. 5 - A hot-air balloon ascends at a constant rate. (a)...Ch. 5 - Prob. 12ECh. 5 - An eraser with a mass of 100 g sits on a book at...Ch. 5 - Prob. 14ECh. 5 - Prob. 15ECh. 5 - Prob. 17ECh. 5 - Prob. 18ECh. 5 - Prob. 19ECh. 5 - Prob. 20ECh. 5 - A certain amount of work is required to stretch a...Ch. 5 - Compute the work done by the variable force in the...Ch. 5 - Prob. 23ECh. 5 - In gravity-free interstellar space, a spaceship...Ch. 5 - A particular spring has a force constant of 2.5 ×...Ch. 5 - Prob. 26ECh. 5 - In stretching a spring in an experiment, a student...Ch. 5 - Prob. 28ECh. 5 - Prob. 29ECh. 5 - A 1200-kg automobile travels at 90 km/h. (a) What...Ch. 5 - Prob. 31ECh. 5 - Prob. 32ECh. 5 - Prob. 33ECh. 5 - Prob. 34ECh. 5 - Prob. 35ECh. 5 - Prob. 36ECh. 5 - Compute the work done by the variable force in the...Ch. 5 - Prob. 38ECh. 5 - Prob. 39ECh. 5 - The floor of the basement of a house is 3.0 m...Ch. 5 - A 0.50-kg mass is placed on the end of a vertical...Ch. 5 - Prob. 42ECh. 5 - A student has six textbooks, each with a thickness...Ch. 5 - A 1.50-kg mass is placed on the end of a spring...Ch. 5 - Suppose the simple pendulum in Exercise 54 were...Ch. 5 - Prob. 46ECh. 5 - Prob. 47ECh. 5 - Prob. 48ECh. 5 - A 1.00-kg block (M) is on a flat frictionless...Ch. 5 - Prob. 50ECh. 5 - A 0.20-kg rubber ball is dropped from a height of...Ch. 5 - Prob. 52ECh. 5 - Prob. 53ECh. 5 - Prob. 54ECh. 5 - Suppose the simple pendulum in Exercise 54 were...Ch. 5 - A 1.5-kg box that is sliding on a frictionless...Ch. 5 - A 0.50-kg mass is suspended on a spring that...Ch. 5 - A vertical spring with a force constant of 300 N/m...Ch. 5 - A block with a mass m1 = 6.0 kg sitting on a...Ch. 5 - A hiker plans to swing on a rope across a ravine...Ch. 5 - Prob. 61ECh. 5 - Prob. 62ECh. 5 - Prob. 63ECh. 5 - Prob. 64ECh. 5 - Prob. 65ECh. 5 - A pump lifts 200 kg of water per hour a height of...Ch. 5 - Prob. 67ECh. 5 - Prob. 68ECh. 5 - Prob. 69ECh. 5 - How much power must you exert to horizontally drag...Ch. 5 - Prob. 71ECh. 5 - Prob. 72ECh. 5 - Prob. 73ECh. 5 - Prob. 74ECh. 5 - A 200-g ball is launched from a height of 20.0 m...Ch. 5 - Prob. 76ECh. 5 - Prob. 77ECh. 5 - Prob. 78ECh. 5 - IE A 0.455-kg soccer ball is kicked off level...
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- A skier of mass 75 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 50 m up a 30° slope (assumed frictionless) at a constant speed of 2.8 m/s? KJ (b) What power (expressed in hp) must a motor have to perform this task? hparrow_forwardA block of mass 1.4 kg is attached to a horizontal spring that has a force constant 900 N/m as shown in the figure below. The spring is compressed 2.0 cm and is then released from rest. a x = 0 x b (a) A constant friction force of 4.4 N retards the block's motion from the moment it is released. Using an energy approach, find the position x of the block at which its speed is a maximum. cm (b) Explore the effect of an increased friction force of 13.0 N. At what position of the block does its maximum speed occur in this situation? cmarrow_forwardA block of mass m = 3.00 kg situated on a rough incline at an angle of 0 = 37.0° is connected to a spring of negligible mass having a spring constant of 100 N/m (see the figure below). The pulley is frictionelss. The block is released from rest when the spring is unstretched. The block moves 11.0 cm down the incline before coming to rest. Find the coefficient of kinetic friction between block and incline. k=100 N/m Ө marrow_forward
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