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a) A 65 kg woman climbs the Washington monument (170 m) in 20 minutes. How much work did she do? What is her power output due to the work? Report in both Watts and horsepower (hp).
b) If her efficiency is 18%, how much food energy did she need to climb the Washington monument? Report in both Joules and Calories (kcal). What is her metabolic rate during the ascent? Report in Watts.
c) How much heat was transferred to the environment to keep her temperature constant? Report in Joules.
d) Suppose she is wearing a thick fleece sweatshirt, and 80% of the heat is transferred right back to her. Her body would compensate by sweating. However, if she can't sweat, then her core temperature would be raised. How much would her temperature be raised assuming she can't sweat? (Overall, this illustrates why we get warm when we exercise. To do work we can only use about 20% of our food calories and the rest gets converted to heat. To compensate, we take off layers and/or sweat.
One component of a magnetic field has a magnitude of 0.028 T and points along to +x axis, while the other component has a magnitude of 0.078 T and points along the -y axis. find the magnitude of the net magnetic force that acts on the particle
In the Atwood machine shown below, m1 = 2.00 kg and m2 = 5.50 kg, How far will m1 descend below its initial level and Find the velocity of m1 after 1.80 s
The drawing shows four insulated wires overlapping one another,forming a square with 0.050-m sides. All four wires are much longerthan the sides of the square. The net magnetic field at the centerof the square is 73 μT directed into the drawing. C..
A 3.7 kg bucket of water is raised from a well by a rope. find the force exerted by the rope on the bucket of water
A crate of mass 10.0 kg is pulled up arough incline with an initial speed of 1.50 m/s. The pulling forceis 100 N parallel to the incline, which makes an angle of16.0° with the horizontal. The coefficient of kinetic friction is 0.400, and the crate..
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A student is running at her top speed of 5.2m/s to catch a bus, which is stopped at the bus stop. For what time does she have to run in that case
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a person (weight W = 598 N, L1 = 0.849 m, L2 = 0.398 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot
A uniformly charged plastic disk has a radius of 0.270 m. At what distance from the center along the central perpendicular axis is the magnitude of the electric field equal to one-half the magnitude of the field at the center of the surface of the di..
A parallel-plate capacitor is formed from two 1.0 cm × 1.0 cm electrodes spaced 2.7 mm apart. The electric field strength inside the capacitor is 1.0×106 N/C What is the charge (in nC) on negative electrode? What is the charge (in nC) on positive ele..
A canal boat (mass=25,000 kilograms) is being towed at a uniform velocity v=3.10 m/s, Determine the magnitude and direction of the towing force
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