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To work off a large pepperoni pizza you ate; you climb a 120 meter high hill.
(a) Suppose a reasonable value for mass, calculate your increase in gravitational potential energy.
(b) Find where does this energy come from?
(c) The human body is typically 20 percent efficient. Find how much energy was converted to thermal energy?
(d) Find how much chemical energy is expended by you during the climb?
Explain how to calculate the ratio of momentum and kinetic energy before and after a collision, What would these ratios be if momentum is conserved or if kinetic energy is conserved?
A 1530 kg car is traveling with a speed of 14.5 m/s. What is the magnitude of the horizontal net force
The tires of a car make 85 revolutionsas the car reduces its speed uniformly from 90 km/h to 60 km/h.The tires have a diameter of 0.80 m. What was the angular acceleration of the tires
A jeweler working with a heated 47 g gold ring should lower the ring's temperature to make it safe to handle. If the ring is initially at 99 degrees Celcius, what mass of water at 25 degrees Celcuis is needed to lower the ring's temperature to 38 ..
A diverging thin lens and a concave mirror have focal lengths of equal magnitude. Determine the properties of the final image of the system affter two refractions
It is then projected up the same plane with an initial speed 4.40 m/s. Explain how far up the incline will the block move before coming to rest?
An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.0 N. What is the volume of the object
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet, in years
Two gerbils run in place with a linear speed of 0.55 on an exercise wheel that is shaped like a hoop. Find the angular momentum of the system
A hoist motor supplied by a 240 V source requires 12 A to lift an 800 kg load at a rate of 9.00 m/min. Determine the power input to the motor
Starting from rest, a basketball rolls from the top to the bottom of a hill, reaching a translational speed of 5.2 m/s. Ignore frictional losses. What is the translational speed of the frozen juice can when it reaches the bottom
Light with a wavelength of 634 nm passes through a slit 7.68 µm wide and falls on a screen 1.85 m away. Find the linear distance on the screen from the central bright fringe to the second dark fringe on either side. cm
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