Questions from Modern Physics

Q: A surgeon is using material from a donated heart to repair a

A surgeon is using material from a donated heart to repair a patient’s damaged aorta and needs to know the elastic characteristics of this aortal material. Tests performed on a 16.0-cm strip of the do...

Q: To stretch a spring 3.00 cm from its unstretched length

To stretch a spring 3.00 cm from its unstretched length, 12.0 J of work must be done. (a) What is the force constant of this spring? (b) What magnitude force is needed to stretch the spring 3.00 cm fr...

Q: What is the magnitude of the average force that her neck exerts

What is the magnitude of the average force that her neck exerts on her head during the landing? (a) 0 N; (b) 60 N; (c) 120 N; (d) 180 N.

Q: While the dancer is in the air and holding a fixed pose

While the dancer is in the air and holding a fixed pose, what is the magnitude of the force her neck exerts on her head? (a) 0 N; (b) 60 N; (c) 120 N; (d) 180 N.

Q: The forces on a dancer can be measured directly when a dancer

The forces on a dancer can be measured directly when a dancer performs a jump on a force plate that measures the force between her feet and the ground. A graph of force versus time throughout a vertic...

Q: Based on the given data, how does the energy used in

Based on the given data, how does the energy used in biking 1 km compare with that used in walking 1 km? Biking takes (a) 1/3 of the energy of walking the same distance; (b) the same energy as walkin...

Q: A block rests on an inclined plane with enough friction to prevent

A block rests on an inclined plane with enough friction to prevent it from sliding down. To start the block moving, is it easier to push it up the plane or down the plane? Why?

Q: Consider a graph of instantaneous power versus time, with the vertical

Consider a graph of instantaneous power versus time, with the vertical P-axis starting at P = 0. What is the physical significance of the area under the P-versus-t curve between vertical lines at t1 a...

Q: Based on the given data, how does the energy used in

Based on the given data, how does the energy used in biking 1 km compare with that used in walking 1 km? Biking takes (a) 1 3 of the energy of walking the same distance; (b) the same energy as walking...

Q: How many times greater is the kinetic energy of the person when

How many times greater is the kinetic energy of the person when biking than when walking? Ignore the mass of the bike. (a) 1.7; (b) 3; (c) 6; (d) 9.