For a rope obeying Hooke's law show that the elastic potential energy stored in the rope is given by

E=1/2kx^2

where k is the elastic spring constant and x is the extension.

What is the speed of a 2.5-kilogram mass after ot has fallen freely from rest through a distance of 12 meters? a) 4.8 m/s b) 15 m/s c) 30. m/s d) 43 m/s

Are we actually touching nothing but electrons in reality or can we actually feel things without the electron barier?

An object at rest increases its velocity to 10m/s in 3 seconds. What is its acceleration

What are the different types of forces and how do they act on objects

How does Einstein's famous equation, E = mc2, relate to the production of the Sun's energy? Be sure to include what each factor in the equation represents with respect to what happens inside the Sun.

A fountain of water and steam that erupts from the ground

A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. how much work is done (in ft-lb) in pulling half the rope to the top of the building?

Does adding a neutron to an atom's nucleus makes it an ion?

What is the difference between a fault-block and upwarped mountains?

Which of the following is not one of the reasons to properly warm up before exercising? A. Develop overall flexibility. B. Increase blood flow to the muscles and raise body temperature. C. Prevent injuries such as strains sprains and muscle cramps.