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A 80 kg student consumes 2500 cal each day and stays the same weight. One day, he eats 3500 cal and, wanting to keep from gaining weight, decides to "work off" the excess by jumping up and down. With each jump, he accelerates to a speed of 2.8m/s before leaving the ground.
How many jumps must he make? Assume that the efficiency of the body in using energy is 25%?
A positively charged He+ atom has two protons in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
A physics student playing with an air hockey table (a frictionless surface) finds that if she gives the puck a velocity of 3.87m/s along the length ( 1.78m ) of the table at one end, What is the angle of inclination
A wave has the following properties: amplitude = 0.559 m, period = 0.801 s, wave speed = 13.9 m/s. What is the equation for the wave
If wavelength is 5890 , and slits width is 0.25 mm, find its angular separation between central maxima
A positive charge moves in a region where the magnetic field is uniform, has a magnitude of 60 uT and points in the positive x direction. what is the radius of the resulting path
A 70.0 kg stuntman is attached to a bungee cord. He is standing on a ledge that is 50 m high. How much gravitational potential energy does he have
Saturated water vapor at 2800C is isothermally condensed to a saturated liquid in a piston-cylinder system. Calculate the heat transfer
A hammer is hanging by a light rope from the ceiling of a bus. The ceiling of the bus is parallel to the roadway, What is the acceleration of the bus
a small piece of dust of mass m 2.0 microg travels through an electric air cleaner in which the electric field is 549
The new blade on my table saw has a radius of 15.0 cm. My table saw has a maximum speed of 3750 rpm. If it takes 2.50 seconds to get up to this final speed, what is the tangential velocity of the tip of the saw blade,
If a mass of 1 kg is accelerated 1 m/s2 by a force of 1 N, illustrate what would be the acceleration of 10 kg acted on by a force of 20 N?
Lawn spheres placed on a pedestals are convex mirrors. Onesphere has the diameter of 37 cm. What is the height of the bird's image
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