1 Physics And Measurement 2 Motion In One Dimension 3 Vectors 4 Motion In Two Dimensions 5 The Laws Of Motion 6 Circular Motion And Other Applications Of Newton’s Laws 7 Energy Of A System 8 Conservation Of Energy 9 Linear Momentum And Collisions 10 Rotation Of A Rigid Object About A Fixed Axis 11 Angular Momentum 12 Static Equilibrium And Elasticity 13 Universal Gravitation 14 Fluid Mechanics 15 Oscillatory Motion 16 Wave Motion 17 Sound Waves 18 Superposition And Standing Waves 19 Temperature 20 The First Law Of Thermodynamics 21 The Kinetic Theory Of Gases 22 Heat Engines, Entropy, And The Second Law Of Thermodynamics 23 Electric Fields 24 Gauss’s Law 25 Electric Potential 26 Capacitance And Dielectrics 27 Current And Resistance 28 Direct-current Circuits 29 Magnetic Fields 30 Sources Of The Magnetic Field 31 Faraday’s Law 32 Inductance 33 Alternating Current Circuits 34 Electromagnetic Waves 35 The Nature Of Light And The Principles Of Ray Optics 36 Image Formation 37 Wave Optics 38 Diffraction Patterns And Polarization 39 Relativity Chapter7: Energy Of A System
Chapter Questions Section: Chapter Questions
Problem 7.1QQ Problem 7.2QQ: Figure 7.4 shows four situations in which a force is applied to an object. In all four cases, the... Problem 7.3QQ: Which of the following statements is true about the relationship between the dot product of two... Problem 7.4QQ: A dart is inserted into a spring-loaded dart gun by pushing the spring in by a distance x. For the... Problem 7.5QQ: A dart is inserted into a spring-loaded dart gun by pushing the spring in by a distance x. For the... Problem 7.6QQ: Choose the correct answer. The gravitational potential energy of a system (a) is always positive (b)... Problem 7.7QQ: A ball is connected to a light spring suspended vertically as shown in Figure 7.18. When pulled... Problem 7.8QQ: What does the slope of a graph of U(x) versus x represent? (a) the magnitude of the force on the... Problem 7.1OQ: Alex and John are loading identical cabinets onto a truck. Alex lifts his cabinet straight up from... Problem 7.2OQ: If the net work done by external forces on a particle is zero, which of the following statements... Problem 7.3OQ: A worker pushes a wheelbarrow with a horizontal force of 50 N on level ground over a distance of 5.0... Problem 7.4OQ: A cart is set rolling across a level table, at the same speed on every trial. If it runs into a... Problem 7.5OQ Problem 7.6OQ: Is the work required to be done by an external force on an object on a frictionless, horizontal... Problem 7.7OQ: A bloc k, of mass m is dropped from the fourth Moor of an office building and hits the sidewalk... Problem 7.8OQ: An a simple pendulum swings back and forth, the forces acting on the suspended object are (a) the... Problem 7.9OQ: Bullet 2 has twice the mass of bullet 1. Both are fired so that they have the same speed. If the... Problem 7.10OQ: Figure OQ7.10 shows a light extended spring exerting a force Fs to the left on a block. (i) Does the... Problem 7.11OQ: If the speed of a particle is doubled, what happens to its kinetic energy? (a) It becomes four times... Problem 7.12OQ Problem 7.13OQ Problem 7.14OQ: A certain spring that obeys Hookes law is stretched by an external agent. The work done in... Problem 7.15OQ: A cart is set rolling across a level table, al the same speed on every trial. If it runs into a... Problem 7.16OQ: An ice cube has been given a push and slides without friction on a level table. Which is correct?... Problem 7.1CQ: Can a normal force do work? If not, why not? If so, give an example. Problem 7.2CQ: Object 1 pushes on object 2 as the objects move together, like a bulldozer pushing a stone. Assume... Problem 7.3CQ: A student has the idea that the total work done on an object is equal to its final kinetic energy.... Problem 7.4CQ: (a) For what values of the angle between two vectors is their scalar product positive? (b) For what... Problem 7.5CQ Problem 7.6CQ: Discuss the work done by a pitcher throwing a baseball. What is the approximate distance through... Problem 7.7CQ Problem 7.8CQ: If only one external force acts on a particle, does it necessarily change the particles (a) kinetic... Problem 7.9CQ Problem 7.10CQ Problem 7.11CQ: A certain uniform spring has spring constant k. Now the spring is cut in half. What is the... Problem 7.12CQ Problem 7.13CQ: Does the kinetic energy of an object depend on the frame of reference in which its motion is... Problem 7.14CQ: Cite two examples in which a force is exerted on an object without doing any work on the object. Problem 7.1P: A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 25.0 below... Problem 7.2P: A raindrop of mass 3.35 10-5 kg falls vertically at constant speed under the influence of gravity... Problem 7.3P: In 1990, Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using... Problem 7.4P: The record number of boat lifts, including the boat and its ten crew members, was achieved by Sami... Problem 7.5P: A block of mass m = 2.50 kg is pushed a distance d = 2.20 m along a frictionless, horizontal table... Problem 7.6P: Spiderman, whose mass is 80.0 kg, is dangling on the free end of a 12.0-m-long rope, the other end... Problem 7.7P Problem 7.8P: Vector A has a magnitude of 5.00 units, and vector B has a magnitude of 9.00 units. The two vectors... Problem 7.9P Problem 7.10P: Find the scalar product of the vectors in Figure P7.7. Figure P7.7 Problem 7.11P: A force F = (6i 2j) N acts on a panicle that under-goes a displacement r = (3i + j) m. Find (a) the... Problem 7.12P: Using the definition of the scalar product, find the angles between (a) A=3i2j and B=4i4j, (b)... Problem 7.13P: Lei B = 5.00 m at 60.0. Let the vector C have the same magnitude as A and a direction angle greater... Problem 7.14P: The force acting on a panicle varies as shown in Figure la P7.14. Find the work done by the force on... Problem 7.15P: A particle is subject to a force Fx that varies with position as shown in Figure P7.9. Find the work... Problem 7.16P: In a control system, an accelerometer consists of a 4.70-g object sliding on a calibrated horizontal... Problem 7.17P: When a 4.00-kg object is hung vertically on a certain light spring that obeys Hookes law, the spring... Problem 7.18P: Hookes law describes a certain light spring of unstretched length 35.0 cm. When one end is attached... Problem 7.19P: An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero to... Problem 7.20P: A light spring with spring constant 1 200 N/m is hung from an elevated support. From its lower end... Problem 7.21P: A light spring with spring constant k1 is hung from an elevated support. From its lower end a second... Problem 7.22P: Express the units of the force constant of a spring in SI fundamental units. Problem 7.23P: A cafeteria tray dispenser supports a stack of trays on a shelf that hangs from four identical... Problem 7.24P: A light spring with force constant 3.85 N/m is compressed by 8.00 cm as it is held between a... Problem 7.25P: A small particle of mass m is pulled to the top of a friction less half-cylinder (of radius R) by a... Problem 7.26P: The force acting on a particle is Fx = (8x 16), where F is in newtons and x is in meters. (a) Make... Problem 7.27P: When different loads hang on a spring, the spring stretches to different lengths as shown in the... Problem 7.28P: A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the... Problem 7.29P: A force F = (4xi + 3yj), where F is in newtons and x and y are in meters, acts on an object as the... Problem 7.30P: Review. The graph in Figure P7.20 specifies a functional relationship between the two variables u... Problem 7.31P: A 3.00-kg object has a velocity (6.00i - 2.00j) m/s. a) What is its kinetic energy at this moment?... Problem 7.32P Problem 7.33P: A 0.600-kg particle has a speed of 2.00 m/s at point and kinetic energy of 7.50 J at point . What... Problem 7.34P: A 4.00-kg particle is subject to a net force that varies with position as shown in Figure P7.9. The... Problem 7.35P: A 2 100-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 5.00 m... Problem 7.36P: Review. In an electron microscope, there is an electron gun that contains two charged metallic... Problem 7.37P: Review. You can think of the workkinetic energy theorem as a second theory of motion, parallel to... Problem 7.38P: Review. A 7.80-g bullet moving at 575 m/s strikes the hand of a superhero, causing the hand to move... Problem 7.39P: Review. A 5.75-kg object passes through the origin at time t = 0 such that its x component of... Problem 7.40P: A 1 000-kg roller coaster car is initially at the top of a rise, at point . It then moves 135 ft, at... Problem 7.41P: 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 7.42P: A 400-N child is in a swing that is attached to a pair of ropes 2.00 in long. Find the gravitational... Problem 7.43P: A 4.00-kg particle moves from the origin to position , having coordinates x = 5.00 m and y = 5.00 m... Problem 7.44P: (a) Suppose a constant force acts on an object. The force does not vary with time or with the... Problem 7.45P: A force acting on a particle moving in the xy plane is given by F=(2yi+x2j), where F is in newtons... Problem 7.46P: An object moves in the xy plane 111 Figure P7.43 and experiences a friction force with constant... Problem 7.47P Problem 7.48P: Why is the following situation impossible? A librarian lifts a book from the ground to a high shelf,... Problem 7.49P: A potential energy function for a system in which a two-dimensional force acts is of the form U =... Problem 7.50P: A single conservative force acting on a particle within a system varies as F = ( Ax + Bx2)i where A... Problem 7.51P: A single conservative force acts on a 5.0-kg particle within a system due to its interaction with... Problem 7.52P: For the potential energy curve shown in Figure P7.38, (a) determine whether the force Fx is... Problem 7.53P: A right circular cone can theoretically be balanced on a horizontal surface in three different ways.... Problem 7.54AP: The potential energy function for a system of particles is given by U(x) = x3 + 2x2 + 3x, where x is... Problem 7.55AP Problem 7.56AP: A particle moves along the xaxis from x = 12.8 m to x = 23.7 m under the influence of a force... Problem 7.57AP: Two identical steel balls, each of diameter 25.4 nun and moving in opposite directions at 5 m/s, run... Problem 7.58AP: When an object is displaced by an amount x from stable equilibrium, a restoring force acts on it,... Problem 7.59AP: A 6 000-kg freight car rolls along rails with negligible friction. The car is brought to rest by a... Problem 7.60AP: Why is the following situation impossible? In a new casino, a supersized pinball machine is... Problem 7.61AP Problem 7.62AP: The spring constant of an automotive suspension spring increases with increasing load due to a... Problem 7.63AP: An inclined plane of angle = 20.0 has a spring of force constant k = 500 N/m fastened securely at... Problem 7.64AP: An inclined plane of angle has a spring of force constant k fastened securely at the bottom so that... Problem 7.65AP: (a) Take U = 5 for a system with a particle at position x = 0 and calculate the potential energy of... Problem 7.66CP: A particle of mass m = 1.18 kg is attached between two identical springs on a frictionless,... Problem 7.67CP: Review. A light spring has unstressed length 15.5 cm. It is described by Hookes law with spring... Problem 7.11P: A force F = (6i 2j) N acts on a panicle that under-goes a displacement r = (3i + j) m. Find (a) the...
Related questions
A block of mass 1 kg is pushed up a surface inclined to horizontal at an angle of 30o by a force of 10 N parallel to the inclined surface. The coefficient of friction between the block and the incline is 0.1. If the block is pushed up by 10 m along the incline, calculate
a) work done against gravity
b) work done against the force of friction
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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