Questions from Modern Physics

Q: When a certain force is applied to an ideal spring, the

When a certain force is applied to an ideal spring, the spring stretches a distance x from its un stretched length and does work W. If instead twice the force is applied, what distance (in terms of x)...

Q: You are a Starfleet captain going boldly where no man has gone

You are a Starfleet captain going boldly where no man has gone before. You land on a distant planet and visit an engineering testing lab. In one experiment a short, light rope is attached to the top o...

Q: An adventurous archaeologist crosses between two rock cliffs by slowly going hand

An adventurous archaeologist crosses between two rock cliffs by slowly going hand over hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope (Fig. P5.60). The rope...

Q: Two ropes are connected to a steel cable that supports a hanging

Two ropes are connected to a steel cable that supports a hanging weight (Fig. P5.61). (a) Draw a free-body diagram showing all of the forces acting at the knot that connects the two ropes to the steel...

Q: In Fig. P5.62 a worker lifts a weight w

In Fig. P5.62 a worker lifts a weight w by pulling down on a rope with a force F S. The upper pulley is attached to the ceiling by a chain, and the lower pulley is attached to the weight by another ch...

Q: In a repair shop a truck engine that has mass 409 kg

In a repair shop a truck engine that has mass 409 kg is held in place by four light cables (Fig. P5.63). Cable A is horizontal, cables B and D are vertical, and cable C makes an angle of 37.1o with a...

Q: A horizontal wire holds a solid uniform ball of mass m in

A horizontal wire holds a solid uniform ball of mass m in place on a tilted ramp that rises 35.0° above the horizontal. The surface of this ramp is perfectly smooth, and the wire is directe...

Q: A solid uniform 45.0-kg ball of diameter 32

A solid uniform 45.0-kg ball of diameter 32.0 cm is supported against a vertical, frictionless wall by a thin 30.0-cm wire of negligible mass (Fig. P5.65). (a) Draw a free-body diagram for the ball, a...

Q: A box is sliding with a constant speed of 4.00

A box is sliding with a constant speed of 4.00 m/s in the +x-direction on a horizontal, frictionless surface. At x = 0 the box encounters a rough patch of the surface, and then the surface becomes eve...

Q: When you do a chin-up, you raise your chin

When you do a chin-up, you raise your chin just over a bar (the chinning bar), supporting yourself with only your arms. Typically, the body below the arms is raised by about 30 cm in a time of 1.0 s,...