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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?
Show that the frequency of this radiation is 10 GHz. Show that the time required for a pulse of radar waves CO reach an airplane 5 km away and return is 3.3 X 10-5 s.
A man bungee jumps off a bridge. After the jump, he is bobbing up and down. It takes 5.71 seconds for him to make one complete cycle. Calculate his frequency of oscillation.
If air resistance can be neglected, how does the acceleration of the ball that has been tossed straight upward compare with its acceleration if it is simply dropped
You want to construct a physical pendulum with a period of 4.0 s at a location where g = 9.8m /s2. (a) What is the length of a simple pendulum having this period?
A coil has a DC resistance of 100 Ω and an impedance of 180 Ω at a frequency of 2 kHz. Neglect the wiring capacitance of the coil at this frequency. What is the inductance of the coil? Answer in units of mH.
Anelastic conducting material is stretched into a circular loop of15.0 cm radius. It is placed with itsplane perpendicular to a uniform 0.800T magnetic field. What emf is induced in the loop at that instant
A 50 gallon buoy is tied to the bottom of a still lake by a rope. 26% of its volume is below water. What is the buoyant force on the buoy
consider two point particles that have charge e are at rest and are separated by 3.70 x 10-15 m.a how much work was
A Roman centurion fires off a vat of burning pitch from hiscatapult at 18.2m/s, 37 degrees above the horizontal. how long was the vat in the air
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.20×10^6N , one at an angle 17.0 degrees west of north, What is the total work done by the two tugboats on the supertanker
in a rectangular coordinate system a positive point charge q 8.00 nc is placed at the point x 0.250 m y 0 and an
A bob of mass m is suspended from a string of length L, forming a pendulum. The period of this pendulum is3.5 s. If the pendulum bob is replacedwith one of mass 1/3m and the length of the pendulum is increasedto 2L, what is the period of oscillation?
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