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William burns 5.2 g of peanuts beneath 1000 g of water, which increases in temperature from 27C to 43C. Assuming 30% efficiency, what is the food value of the peanut?
Answer in units of cal
Monochromatic light of wavelength 683 nm passes through a fast shutter that opens for 10^(-10) s. The light the emerges will no longer be monochromatic. What will be the spread of the wavelengths?
Object O1 is 13.7 cm to the left of a converging lens with a 11.9-cm focal length. What is the focal length of the second lens
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 20.0 m/s at an angle 49.0 degrees, What is the distance between the two girls
If the light from the spotlight strikes the mirror at an angle to the normal, what angle to the normal would you expect for the reflected rays.
a manufacturer of fasteners uses a four die nut former to produce blanks and the piercer punch began to break down
Two equally charged insulating balls each weigh 0.10 g and hang from a common point by identical threads 30 cm long. What is the magnitude of the charge on each ball
An engine absorbs 3,470 J of heat energy each cycle and expels 1,150 J. If it is a reversible heat engine and the hot reservoir is at 730 K, what is the temperature of the cold reservoir
Kieran takes off down a 50m high, 10° slope on his jet-powered skis. The skis have a thrust of 320 N. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible). Kieran's speed at the bottom is 40 m/s. What is the coefficient of k..
A 1800 kg car is moving westward with a speed of 26 m/s, and a 2900 kg truck is traveling east with a speed of 14 m/s. Find the velocity of the center of mass of the system
Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of 30.0â. what is his speed as he leaves the roof
The electric field everywhere on the surface of a charged sphere of radius 0.180 m has a magnitude of 500 N/C, What is the net charge on the sphere
How much charge passes through the hair dryer. Find the magnitude of the magnetic field at the center of the square.
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