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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.
When a large bone such as the femur is broken, the two pieces are often pulled out of alignment by the complicated combination of tension, how much mass m must be attached to the bottom pulley
The distance to a star is approximately 4.50 x 1018 meter. If this star were to burn out today, in how many years would we see it disappear
Three moles of nitrogen gas,N2, at 31.0°C arecontained in a 19.5 L cylinder. Find the pressure the gas exerts on the cylinder walls
What is the electric field just inside the shell? What is the electric field just outside the shell? Where on the conductor does the -3.0μC end up?
Short pulses of laser light traveling in the x-direction with a diameter of 1 mm are incident on a perfect mirror. The pulses are 10^-13 seconds long and have a repetition rate of 10 Hz, each with an energy of 1 mJ.
The height of a helicopter above the ground is given by h = 3.35t3, where h is in meters and t is in seconds. How long after its release does the mailbag reach the ground
The expert did not answer part B of this problem. How do you find the speed of the wrench as it passes through equilibrium
A skier with a mass of 59 kg starts from rest and skis down an icy (frictionless) slope that has a length of 44 m at an angle of 32° with respect to the horizontal.
The force has magnitude 2.0 N and is directed at a counterclockwise angle of 100" from the positive direction of the x axis. How much work is done by the force on the coin during the displacement?
A pair of speakers separated by 0.700m are driven by the same oscillator at a frequency if 690Hz. an observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers.
a sailboat is traveling east at 5.9 . a sudden gust of wind gives the boat an acceleration 0.80 40 north of east.
A stone of mass M rests on a spring which is compressed a distanceof 1 cm by the stone. The stone is pushed down an additionaldistance of 3 cm and then released. What is the maximum height reached by the stone relative to the release point?
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