Questions from College Physics

Q: A spring scale hangs from a cord that is attached to a

A spring scale hangs from a cord that is attached to a hook in the ceiling. A 10 kg object hangs from a second cord connected to the bottom of the scale. The weights of the cords and the scale are neg...

Q: Two springs are connected in series so that spring scale A hangs

Two springs are connected in series so that spring scale A hangs from a hook on the ceiling and a second spring scale, B, hangs from the hook at the bottom of scale A. Apples weighing 120 N hang from...

Q: Two boxes with different masses are tied together on a frictionless ramp

Two boxes with different masses are tied together on a frictionless ramp surface. What is the tension in each of the cords?

Q: A 200.0 N sign is suspended from a horizontal strut

A 200.0 N sign is suspended from a horizontal strut of negligible weight. The force exerted on the strut by the wall is horizontal. Draw an FBD to show the forces acting on the strut. Find the tension...

Q: The drawing shows a wire attached to two back teeth and stretched

The drawing shows a wire attached to two back teeth and stretched across a front tooth. The purpose of this arrangement is to apply a force F to the front tooth. (The figure has been simplified by dra...

Q: A crow perches on a clothesline midway between two poles. Each

A crow perches on a clothesline midway between two poles. Each end of the rope makes an angle of θ below the horizontal where it connects to the pole. If the weight of the crow is W, what...

Q: A 2.0 kg ball tied to a string fixed to

A 2.0 kg ball tied to a string fixed to the ceiling is pulled to one side by a force F. Just before the ball is released and allowed to swing back and forth, (a) how large is the force F that is holdi...

Q: A 45 N lithograph is supported by two wires. One wire

A 45 N lithograph is supported by two wires. One wire makes a 25° angle with the vertical and the other makes a 15° angle with the vertical. Find the tension in each wire.

Q: An ideal pulley is hung from the ceiling by a rope.

An ideal pulley is hung from the ceiling by a rope. A block of mass M is suspended by another rope that passes over the pulley and is attached to the wall. The rope fastened to the wall makes a right...

Q: A freight train consists of an engine and several identical cars on

A freight train consists of an engine and several identical cars on level ground. Determine whether each of these statements is correct or incorrect and explain why. (a) If the train is moving at con...