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A person can generate about 300 W of power on a treadmill. If the treadmill is inclined at 2% and a70-kg man runs at 3 m/s for 45 min, consider the following.
(a) Calculate the percentage of the power output that goes into heating up his body. Calculate the percentage that keeps him moving on the treadmill. (b) How much water would that heat evaporate? Assume the water starts at body temperature, 37 oC.
In a film projection apparatus it is desired to produce pictures12 feet wide on a screen 50 feet from the lens; What must be the focal length of the projection lens used
A metal conduit will be used as a pathway for wiring through a concrete block. What is the volume of metal in the conduit in cubic centimeters
a horizontal wire is hung from the ceiling of a room by two mass less strings. the wire has a length of 0.20 m and a
An ac generator with a frequency of 1.34 kHz and an rms voltage of 24.2V is connected in series with a 2.00 kohm resistor and a 315 mH inductor. What is the power factor for this circuit? What is the average power consumed by this circuit?
An unknown substance has a mass of 0.125 kg and an initialtemperature of 95.0°C. calculate the specific heat of the unknown substance
The total kinetic energy in one mole of nitrogen is 4,000 J. what is the root mean-square velocity of an individual particle in the ideal gas
A cylindrcal waste basket with a .300 m radius and .150 m height is properly standing on the floor. Find the total flux of the electric field through the sides and bottom
Two parallel square metal plates (side length: 13 cm) are separated by a dielectric material with a dielectric constant 3.9 and a thickness of 2.4 mm. Find the capacitance of the parallel-plate capacitor
A hoop of mass 1.5 kilogram and radius 60 centimeter has a string wrapped around its circumference and lies flat on a horizontal frictionless table. Find how far does the center of the hoop travel in 3.0 second
The United States and South Korean soccer teams are playing in the first round of the World Cup. find its velocity at the time of interception
A girl is jumping on a trampoline and reaches a maximum height of 3.1 meters, h=3.1m. She has a mass of m = 53kg. what is the spring constant k in N/m of the trampoline
A water heater consisting of a metal coil that is connected across the terminals of a 18-V power supply is able to heat 255 mL of water from room temperature (20°C) to boiling point in 75 s.
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