 Q: A simple pendulum consists of a small object of mass 3.

A simple pendulum consists of a small object of mass 3.0 kg hanging at the end of a 2.0-m-long light string that is connected to a pivot point. (a) Calculate the magnitude of the torque (due to the fo...

Q: A dental bracket exerts a horizontal force of 80.0 N

A dental bracket exerts a horizontal force of 80.0 N on a tooth at point B in Figure P8.6. What is the torque on the root of the tooth about point A? Figure P8.6:

Q: The density of air is 1.3 kg/m3 at

The density of air is 1.3 kg/m3 at sea level. From your knowledge of air pressure at ground level, estimate the height of the atmosphere. As a simplifying assumption, take the atmosphere to be of unif...

Q: Two point masses are the same distance R from an axis of

Two point masses are the same distance R from an axis of rotation and have moments of inertia IA and IB. (a) If IB = 4IA, what is the ratio mB/mA of the two masses? (b) At what distance from the axis...

Q: Markings to indicate length are placed on a steel tape in a

Markings to indicate length are placed on a steel tape in a room that is at a temperature of 22°C. Measurements are then made with the same tape on a day when the temperature is 27°C. Are the measurem...

Q: A container filled with an ideal gas is connected to a reservoir

A container filled with an ideal gas is connected to a reservoir of the same gas so that the number of moles in the container can change. If the pressure and volume of the container are each doubled w...

Q: Calculate the net torque (magnitude and direction) on the beam

Calculate the net torque (magnitude and direction) on the beam in Figure P8.5 about (a) An axis through O perpendicular to the page and (b) An axis through C perpendicular to the page. Figure P8.5:

Q: A rubber balloon is blown up and the end tied. Is

A rubber balloon is blown up and the end tied. Is the pressure inside the balloon greater than, less than, or equal to the ambient atmospheric pressure? Explain.