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Design a personal exercise machine that uses the otherwise dissipated human exercise energy in some productive way. For example, the exercise energy could be converted into mechanical, chemical, or electrical energy, which could then be used in some domestic device (for example, to power a computer, TV set, or kitchen appliance).
Another solution would be to design a system that would feed the exercise energy directly into the local electrical power grid for credit against the user's electrical bill (like wind power devices today).
If 100 million people exercised for 15 min every day of the year at a power level of 100. W each, how many barrels of crude oil (at 5.80 × 106 Btu per barrel) and how many tons of coal (at 26.0 × 106 Btu per ton) could be saved annually?
If an electric wire is allowed to produce a magnetic field no larger than that of the Earth (0.50 x 10-4 T) at a distance of 15 centimeter from the wire, obtain the maximum current the wire can carry
A weight lifter struggles but manages to keep a heavy barbell above his head. Occasionally he slips and the barbell starts to fall downward, but he always recovers. Compare the force exerted by the weight lifter on the barbell to that exerted by t..
A person lifts a 4.7 kg cement block avertical distance of 1.02 m and thencarries the block horizontally a distance of 9.10 m. How much work is done by gravity in the process
A house sits in a valley and is 30 m lower than the water tower that serves it. What is the speed of water when it sprays out of a shower in the house?
A glass lens (nglass = 1.52) has a 136 nm thick anti-reflective film (nfilm = 1.33) on one side. What is the largest wavelength of the light that is totally removed by the film
In two attempts, a javelin is thrown at angles of 35° and 60° respectively, to the horizontal from the same height and at the same speed in each case. How many times farther
an aluminum rod is 18.5 cm long at 20 C and has a mass of 350g. if 15000 J of energy is added to the rod by heat, what is the change in lenghth of the rod
atom X moves to the right at .99c and atom Y moves to the left at .99c according to an observer
A proton accelerates from rest in a uniform electric field of 680 N/C. At some later time, its speed is 1.42 106 m/s. How long does it take the proton to reach this speed
In tae-kwon-do, a hand is slammed down onto a target at a speed of13m/s and comes to a stop during the4.4ms collision. find the magnitude of the impulse on the hand from the target
A slingshot consists of a rubber strap attached to a y-shaped frame, with a small pouch at the center of the strap to hold a rock or other small projectile. FIND the potential energy of the system prior to release
Water has a density of 1000 kg/m3. 1 atm = 1.013 x 105 N/m2. Water at a gauge pressure of 4.4 atm enters a building at ground level. what is the gauge pressure in the pipe on the top floor
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