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In moving out of a dormitory at the end of the semester, a student does 1.6 x 10^4 J of work. In the process, his internal energy decreases.
An arrow, starting from rest, leaves the bow with a speed of 25.0 m/s. If the average force exreted on the arrow by the bow were doubled.
Calculate the velocity and the kinetic energy of the hammer/pile combination immediately after impact.
If the person exerted an effort force of 250 newtons to roll the barrel along the ramp, what is the efficiency of the ramp?
What is the work done by the gravitational force when the shot has risen to a height of 2.13 m above the ground.
Does the answer to part b depend on weather the ball is moving up or down at a height of 20m? Please explain.
Suppose we have two blocks composed of 6 harmonic oscillators each and have 3 quanta in each initially.
The goal is to give a guitar maker a list of the separation between successive frets on the neck of the guitar. In Figure, the frets
When an electron released from rest at point A arrives at point C, its kinetic energy is KA.When the electron is released from rest at point B.
The magnetic susceptibility per unit volume of a magnetic solid is given by x = A/(T-theta) where A and theta are constants independent of magnetic field.
A particle of mass m is moving on a frictionless horizontal table and is attached to a massless string, whose other end passes through a hole.
Calculate the work done on the tool by F if this displacement is along the straight line y=x that connects these two points.
Assume that the earth and the moon have circular orbits (which is almost true) and that the periods of their orbits are 365 days and 28.0 days, respectively.
What is the potential energy for the child just as she is released, compared with the potential energy at the bottom of the swing?
What would x be for the same h and y as in part A if you let a silver dollar roll down the track? You can ignore the work done by friction.
A helicopter is cruising at a speed of 25.0 m/s at an altitude of 185 m. What is the total mechanical energy of the helicopter?
An uncovered swimming pool loses 1 inch of water off of its 1000ft^2 surface each week due to evaporation
In the year 2050, very efficient heating systems involving heat pumps are commonly used. When people leave their heated office room
A 1 m^3 closed container contains air with vapor pressure 10hPa. a dish containing 8 g of liquid water is placed in the container.
How much more effective will a double layered heat shield (.1mm stainless steel outer shell (facing radiant heat source)
In a simulation, m1 is 1.0 kg and m2 is 1.1 kg. Mass m2 rests on the floor that exerts a normal force, FN, on m2.
Your local electric company supplies you with 1 kW of power for 1 hour for 8 cents. Assume that you could climb these stairs continuously for 1 hour.
Light from a laser hits the surface of cesium. With a minimum photon energy of 2.14eV being required to remove photons.
The inverse square law has very practical applications.
A 400-lb piano on frictionless casters is to be pushed up a 20 ft ramp to a loading platform 3 ft above the ground. How much force is needed?