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Find how many grams of carbohydrate does a person of mass 74 kilogram need to metabolize to climb five flights of stairs (15 meter height increase)? Each gram of carbohydrate provides 17.6 kilojoules of energy. Suppose 10.0 percent efficiency - that is, 10.0 percent of the available chemical energy in the carbohydrate is converted to mechanical energy. Explain what happens to the other 90 percent of the energy?
A bungee jumper has a mass of 68 kg. If he jumps off a bridge that is 200. m high and uses a bungee cord that is 75 m long with a spring constant of 20. N/m
a horizontal force of 200n is applied to a 55-kg cart across a 10m level surface. if the cart accelerates at 2.0 ms2
a high-voltage copper transmission line with a diameter of 1.40 cm and a length of 300 km carries a steady current of
The person shown below is pushing on a refrigerator that sits on a level floor. Assume the floor is very slippery so that the only horizontal force on the refrigerator is due to the person. find the magnitude of the refrigerator's acceleration
A sinusoidal wave of frequency 350 Hz has a speed of 340 m/s. What is the phase difference between two displacements at a certain point at times 4.0 ms apart
The mass of a flywheel is 6.0 x10^4 kg. This particular flywheel has its mass concentrated at the rim of the wheel. what is the magnitude of its angular momentum
A 90-tonne (1 t = 1000kg ) spacecraft moving in the positive x-direction at 0.48 m/s docks with a 75-tonne craft moving in the negative x-direction at 0.80 m/s. Find the velocity of the joined spacecraft.
Initially at rest, a small copper sphere with a mass of 4. 10-6 kg and a charge of 9. 10-4 C is accelerated through a 6500-V potential difference before entering a magnetic field of magnitude 4 T, directed perpendicular to its velocity. What is the r..
Two 1.60 cm-diameter disks spaced 1.60 mm apart form a parallel-plate capacitor. The electric field between the disks is 5.00×10^5 V/m. How much charge is on each disk
Calculate the peak output voltage of a simple generator whose square armature windings are 5.50 cm on a side
pulsars are neutron stars that emit x rays and other radiation in such a way that we on earth receive pulses of
Water is flowing in a cylindrical pipe of varying circular cross-sectional area, and at all points the water completely fills the pipe. What is the radius of the pipe at this point
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