College Physics 11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Raymond A. Serway, Chris Vuille
1 Units, Trigonometry. And Vectors 2 Motion In One Dimension 3 Motion In Two Dimensions 4 Newton's Laws Of Motion 5 Energy 6 Momentum, Impulse, And Collisions 7 Rotational Motion And Gravitation 8 Rotational Equilibrium And Dynamics 9 Fluids And Solids 10 Thermal Physics 11 Energy In Thermal Processes 12 The Laws Of Thermodynamics 13 Vibrations And Waves 14 Sound 15 Electric Forces And Fields 16 Electrical Energy And Capacitance 17 Current And Resistance 18 Direct-Current Circuits 19 Magnetism 20 Induced Voltages And Inductance 21 Alternating-Current Circuits And Electromagnetic Waves 22 Reflection And Refraction Of Light 23 Mirrors And Lenses 24 Wave Optics 25 Optical Instruments 26 Relativity 27 Quantum Physics 28 Atomic Physics 29 Nuclear Physics 30 Nuclear Energy And Elementary Particles Chapter5: Energy
5.1 Work 5.2 Kinetic Energy And T He Work- Energy Theorem 5.3 Gravitational Potential Energy 5.4 Gravity And Nonconservative Forces 5.5 Spring Potential Energy 5.6 Systems And Energy Conservation 5.7 Power 5.8 Work Done By A Varying Force Chapter Questions Section: Chapter Questions
Problem 1CQ: Consider a tug-of-war as in Figure CQ5.1, in which two teams pulling on a rope are evenly matched so... Problem 2CQ: Choose the best answer. A car traveling at constant speed has a net work of zero done on it. (a)... Problem 3CQ: (a) If the height of a playground slide is kept constant, will the length of the slide or whether it... Problem 4CQ: (a) Can the kinetic energy of a system be negative? (b) Can the gravitational potential energy of a... Problem 5CQ: Two toboggans (with riders) of the same mass are at rest on top of a steep hill. As they slide down... Problem 6CQ: A bowling ball is suspended from the ceiling of a lecture hall by a strong cord. The ball is drawn... Problem 7CQ: As a mass tied to the end of a string strings from its highest point down to its lowest point, it is... Problem 8CQ: Discuss whether any work is being done by each of the following agents and, if so, whether the work... Problem 9CQ: When a punter kicks a football, is he doing any work on the ball while the toe of his foot is in... Problem 10CQ: The driver of a car slams on her brakes to avoid colliding with a deer crossing the highway. What... Problem 11CQ: A weight is connected to a spring that is suspended vertically from the ceiling. If the weight is... Problem 12CQ: For each of the situations given, state whether frictional forces do positive, negative, or zero... Problem 13CQ: Suppose you are reshelving books in a library. As you lift a book from the floor and place it on the... Problem 14CQ: Two stones, one with twice the mass of the other, are thrown straight up and rise to the same height... Problem 15CQ: An Earth satellite is in a circular orbit at an altitude of 500 km. Explain why the work done by the... Problem 16CQ: Mark and David are loading identical cement blocks onto Davids pickup truck. Mark lifts his block... Problem 17CQ: If the speed of a particle is doubled, what happens to its kinetic energy? (a) It becomes four times... Problem 18CQ: A certain truck has twice the mass of a car. Both are moving at the same speed. If the kinetic... Problem 19CQ: If the net work done on a particle is zero, which of the following statements must be true? (a) The... Problem 20CQ: A car accelerates uniformly from rest. Ignoring air friction, when does the car require the greatest... Problem 1P: A weight lifter lifts a 350-N set of weights from ground level to a position over his head, a... Problem 2P: In 1990 Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using... Problem 3P: A cable exerts a constant upward tension of magnitude 1.25 104 N on a 1.00 103-kg elevator as it... Problem 4P: a shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25 below the... Problem 5P: Starting from rest, a 5.00-kg block slides 2.50 m down a rough 30.0 incline. The coefficient of... Problem 6P: A horizontal force of 150 N is used to push a 40.0-kg packing crate a distance of 6.00 m on a rough... Problem 7P: A tension force of 175 N inclined at 20.0 above the horizontal is used to pull a 40.0-kg packing... Problem 8P: A block of mass m = 2.50 kg is pushed a distance d = 2.20 m along a frictionless horizontal table by... Problem 9P: A mechanic pushes a 2.50 103-kg car from rest to a speed of v, doing 5.00 103 J of work in the... Problem 10P: A 7.00-kg bowling ball moves at 3.00 m/s. How fast must a 2.45-g Ping-Pong ball move so that the two... Problem 11P: A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance event. (a) What is... Problem 12P: A worker pushing a 35.0-kg wooden crate at a constant speed for 12.0 m along a wood floor does 350 J... Problem 13P: A 70-kg base runner begins his slide into second base when he is moving at a speed of 4.0 m/s. The... Problem 14P: A 62.0-kg cheetah accelerates from rest to its top speed of 32.0 m/s. (a) How much net work is... Problem 15P: A 7.80-g bullet moving at 575 m/s penetrates a tree trunk to a depth of 5.50 cm. (a) Use work and... Problem 16P: A 0.60-kg particle has a speed of 2.0 m/s at point A and a kinetic energy of 7.5 J at point B. What... Problem 17P: A large cruise ship of mass 6.50 107 kg has a speed of 12.0 m/s at some instant. (a) What is the... Problem 18P: A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.850 m/s encounters a rough horizontal... Problem 19P: A 0.20-kg stone is held 1.3 m above the top edge of a water well and then dropped into it. The well... Problem 20P: When a 2.50-kg object is hung vertically on a certain light spring described by Hookes law, the... Problem 21P: A block of mass 3.00 kg is placed against a horizontal spring of constant k = 875 N/m and pushed so... Problem 22P: A 60.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.0 m/s.... Problem 23P: A 2.10 103-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls... Problem 24P: Two blocks are connected by a light string that passes over two frictionless pulleys as in Figure... Problem 25P: A daredevil on a motorcycle leaves the end of a ramp with a speed of 35.0 m/s as in Figure P5.25. If... Problem 26P: Truck suspensions often have helper springs dial engage at high loads. One such arrangement is a... Problem 27P: The chin-up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert... Problem 28P: A flea is able to jump about 0.5 m. It has been said that if a flea were as big as a human, it would... Problem 29P: A 50.0-kg projectile is fired at an angle of 30.0 above the horizontal with an initial speed of 1.20... Problem 30P: A projectile of mass m is fired horizontally with an initial speed of v0 from a height of h above a... Problem 31P: A horizontal spring attached to a wall has a force constant of 850 N/m. A block of mass 1.00 kg is... Problem 32P: A 50.-kg pole vaulter running at 10. m/s vaults over the bar. Her speed when she is above the bar is... Problem 33P: A child and a sled with a combined mass of 50.0 kg slide down a frictionless slope. If the sled... Problem 34P: A 35.0-cm long spring is hung vertically from a ceiling and stretches to 41.5 cm when a 7.50-kg... Problem 35P: A 0.250-kg block along a horizontal track has a speed of 1.50 m/s immediately before colliding with... Problem 36P: A block of mass m = 5.00 kg is released from rest from point and slides on the frictionless track... Problem 37P: Tarzan savings on a 30.0-m-long vine initially inclined at an angle of 37.0 with the vertical. What... Problem 38P: Two blocks are connected by a light string that passes over a frictionless pulley as in Figure... Problem 39P: The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in... Problem 40P: (a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force... Problem 41P: (a) A child slides down a water slide at an amusement park from an initial height h. The slide can... Problem 42P: An airplane of mass 1.50 104 kg is moving at 60.0 m/s. The pilot then increases the engines thrust... Problem 43P: The system shown in Figure P5.43 is used to lift an object of mass m = 76.0 kg. A constant downward... Problem 44P: A 25.0-kg child on a 2.00-m-long swing is released from rest when the ropes of the swing make an... Problem 45P: A 2.1 103-kg car starts from rest at the top of a 5.0-m-long driveway that is inclined at 20.0 with... Problem 46P: A child of mass m starts from rest and slides without friction from a height h along a curved... Problem 47P: A skier starts from rest at the top of a hill that is inclined 10.5 with respect to the horizontal.... Problem 48P: In a circus performance, a monkey is strapped to a sled and both are given an initial speed of 4.0... Problem 49P: An 80.0-kg skydiver jumps out of a balloon at an altitude of 1.00 103 m and opens the parachute at... Problem 50P: Q A skier of mass 70.0 kg is pulled up a slope by a motor-driven cable, (a) How much work is... Problem 51P: What average mechanical power must a 70.0-kg mountain climber generate to climb to the summit of a... Problem 52P: While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body... Problem 53P: The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0 ms. The... Problem 54P: When an automobile moves with constant speed down a highway, most of the power developed by the... Problem 55P: Under normal conditions the human heart converts about 13.0 J of chemical energy per second into... Problem 56P Problem 57P: A 1.50 103-kg car starts from rest and accelerates uniformly to 18.0 m/s in 12.0 s. Assume that,... Problem 58P: A 6.50 102-kg elevator starts from rest and moves upward for 3.00 s with constant acceleration... Problem 59P: The force acting on a particle varies as in Figure P5.59. Find the work done by the force as the... Problem 60P: An object of mass 3.00 kg is subject to a force Fx that varies with position as in Figure P5.60.... Problem 61P: The force acting on an object is given by Fx = (8x 16) N, where x is in meters, (a) Make a plot of... Problem 62AP: An outfielder throws a 0.150-kg baseball at a speed of 40.0 m/s and an initial angle of 30.0. What... Problem 63AP: A roller-coaster car of mass 1.50 103 kg is initially at the top of a rise at point . It then moves... Problem 64AP: A ball of mass m = 1.80 kg is released from rest at a height h = 65.0 cm above a light vertical... Problem 65AP: An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero to... Problem 66AP: A block of mass 12.0 kg slides from rest down a frictionless 35.0 incline and is stopped by a strong... Problem 67AP: (a) A 75-kg man steps out a window and falls (from rest) 1.0 m to a sidewalk. What is his speed just... Problem 68AP: A toy gun uses a spring to project a 5.3-g soft rubber sphere horizontally. The spring constant is... Problem 69AP: Two objects (m1 = 5.00 kg and m2 = 3.00 kg) are connected by a light string passing over a light,... Problem 70AP: A 3.50-kN piano is lilted by three workers at constant speed to an apartment 25.0 m above the street... Problem 71AP: A 2.00 102-g particle is released from rest at point A on the inside of a smooth hemispherical bowl... Problem 72AP: The particle described in Problem 71 (Fig. P5.71) is released from point A at rest. Its speed at B... Problem 73AP: In terms of saving energy, bicycling and walking are far more efficient means of transportation than... Problem 74AP: A 50.0-kg student evaluates a weight loss program by calculating the number of times she would need... Problem 75AP: A ski jumper starts from rest 50.0 m above the ground on a frictionless track and flies off the... Problem 76AP: A 5.0-kg block is pushed 3.0 m up a vertical wall with constant speed by a constant force of... Problem 77AP: A childs pogo slick (Fig. P5.77) stores energy in a spring (k = 2.50 104 N/m). At position (x1 =... Problem 78AP: A hummingbird hovers by exerting a downward force on the air equal, on average, to its weight. By... Problem 79AP: In the dangerous sport of bungee jumping, a daring student jumps from a hot air balloon with a... Problem 80AP: Apollo 14 astronaut Alan Shepard famously took two golf shots on the Moon where its been estimated... Problem 81AP: A truck travels uphill with constant velocity on a highway with a 7.0 slope. A 50.-kg package sits... Problem 82AP: As a 75.0-kg man steps onto a bathroom scale, the spring inside the scale compresses by 0.650 mm.... Problem 83AP Problem 84AP: A cat plays with a toy mouse suspended from a light string of length 1.25 m, rapidly batting the... Problem 85AP: Three objects with masses m1 = 5.00 kg, m2 = 10.0 kg, and m3 = 15.0 kg, respectively, are attached... Problem 86AP: Two blocks, A and B (with mass 50.0 kg and 1.00 102 kg, respectively), are connected by a string,... Problem 7P: A tension force of 175 N inclined at 20.0 above the horizontal is used to pull a 40.0-kg packing...
Related questions
the work she does on the flight bag? The work done by the force of friction on the flight bag? The coefficient of kinetic friction between the flight bag and the floor?
Transcribed Image Text: 14 A flight attendant pulls her 70.0 N flight bag a distance of 253 m along a level
airport floor at a constant velocity. The force she exerts is 40.0 N at an angle of
52.0° above the horizontal.Find the following:
a. the work she does on the flight bag
b. the work done by the force of friction on the flight bag
c. the coefficient of kinetic friction between the flight bag and the floor
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
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