example of a system having both kinetic and potential energy would be: a. a book resting on a table b. a projectile at its highest point c. an object in free fall d. a stretched rubber band

Problem 2 #A A 79 kg olympic diver jumps from a 27 meter diving board A. lick to add speaker notes What is the initial potential energy of the diver? 79 x 9.8 x 27=20,903.4 B. What is its final kinetic energy before she hits the water? C. What is the velocity of the diver as she hits the water?

A. Ignoring air drag, what is the takeoff speed of such a flea? (in m/s) B. Calculate the kinetic energy of this flea at takeoff (in J) C. Calculate the kinetic energy per kilogram of mass (in J/kg) D. If a 73.0 kg, 1.80 m tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump? (in m) E. If a 73.0 kg, 1.80 m tall human could jump to the same height compared with his length as the flea jumps compared with its length, what takeoff speed would the man need? (in m/s) F. Most humans can jump no more than 60.0 cm from a crouched start. What is the kinetic energy per kilogram of mass at takeoff for such a 73.0 kg person? (in J/kg)

Using the principles of energy and conservation of energy, determine how the velocity of an object at the bottom of a ramp is related to its initial starting height. 1. If the ball is initially motionless at the top of a ramp of height h, write down expressions for the initial kinetic, potential, and total energy of the ball. 2. What expressions for the kinetic, potential, and total energy of the ball as it reaches the bottom of the ramp. 3. Using the principle of conservation of energy, what expression relates the final velocity of the ball to its initial height on the ramp.

You push your physics book 2.10 m along a horizontal tabletop with a horizontal push of 2.10 N while the opposing force of friction is 0.700 N. A. How much work does your 2.10 N push do on the book? B. How much work does the friction force do on the book? C. How much work does the normal force from the table do on the book?

150 kg object is at a height of 12 m. A.) How many joules of kinetic energy does it gain when it falls to the ground?  B.) Using concepts of energy, find the speed of the object in meters per second just before it hits the ground.