Aball of mass m = 4.6 kg, at one end of a string of length l= 6.6 m, rotates in a vertical circle just fast enough to prevent the string from going slack at the top of the circle. assuming mechanical energy is conserved, calculate the speed of the ball at the bottom of the circle.

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.