Questions from Modern Physics

Q: A 1130-kg car is held in place by a light

A 1130-kg car is held in place by a light cable on a very smooth (frictionless) ramp (Fig. E5.8). The cable makes an angle of 31.0° above the surface of the ramp, and the ramp itself rises...

Q: A man pushes on a piano with mass 180 kg; it

A man pushes on a piano with mass 180 kg; it slides at constant velocity down a ramp that is inclined at 19.0° above the horizontal floor. Neglect any friction acting on the piano. Calculate the magni...

Q: You push your physics book 1.50 m along a horizontal

You push your physics book 1.50 m along a horizontal tabletop with a horizontal push of 2.40 N while the opposing force of friction is 0.600 N. How much work does each of the following forces do on th...

Q: A 12.0-kg package in a mail-sorting

A 12.0-kg package in a mail-sorting room slides 2.00 m down a chute that is inclined at 53.0° below the horizontal. The coefficient of kinetic friction between the package and the chute’s surface is 0...

Q: A 128.0-N carton is pulled up a frictionless

A 128.0-N carton is pulled up a frictionless baggage ramp inclined at 30.0° above the horizontal by a rope exerting a 72.0-N pull parallel to the ramp’s surface. If the carton travels 5.20 m along the...

Q: A boxed 10.0-kg computer monitor is dragged by

A boxed 10.0-kg computer monitor is dragged by friction 5.50 m upward along a conveyor belt inclined at an angle of 36.9° above the horizontal. If the monitor’s speed is a constant 2.10 cm/s, how much...

Q: We usually ignore the kinetic energy of the moving coils of a

We usually ignore the kinetic energy of the moving coils of a spring, but let’s try to get a reasonable approximation to this. Consider a spring of mass M, equilibrium length L0, and force constant k....

Q: An airplane in flight is subject to an air resistance force proportional

An airplane in flight is subject to an air resistance force proportional to the square of its speed v. But there is an additional resistive force because the airplane has wings. Air flowing over the w...

Q: A 1.50-kg book is sliding along a rough

A 1.50-kg book is sliding along a rough horizontal surface. At point A it is moving at 3.21 m>s, and at point B it has slowed to 1.25 m/s. (a) How much work was done on the book between A and B? (b) I...

Q: You are holding a briefcase by the handle, with your arm

You are holding a briefcase by the handle, with your arm straight down by your side. Does the force your hand exerts do work on the briefcase when (a) you walk at a constant speed down a horizontal ha...