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How much heat is needed to raise 20 grams of water from 5°C to 40°C?
An archeologist has discovered an old artifact. Its carbon-14 content is found to be 41.7 % of that in a fresh sample of wood. Find the age of the sample
When a mass is suspended from a spring, the equilibrium length isincreased by 50mm. The mass is then given a blow which starts it moving vertically at 200mms-2.
A cannonball is shot (from ground level) with an initial horizontal velocity of 34.0 m/s and an initial vertical velocity of 25.0 m/s. find the maximum height the cannonball goes above the ground
Two point charges are separated by a distance r and repel each other with a force F. what is the magnitude of the force of repulsion between them
Two point charges of +20.0 ?C and -8.00 ?C are separated by a distance of 20.0 cm. What is the intensity of electric field E midway between these two charges
a 1cm-tall object placed 20cm front of a concave mirror produces a virtual image that is twice the height of the object. what is the length of the mirror
In the movie Terminator, Arnold Schwarzenegger lifts someone up bythe neck and, with both arms fully extended and horizontal, holdsthe person off the ground.
A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 275 kg · m2, What is the new angular speed of the merry-go-round
Infrared light of wavelength 1.17 um illuminates a 0.34-mm-diameter hole. What is the angle of the first dark fringe in degrees
A fuse in an electric circuit is a wire that is designed to melt,and thereby open the circuit, if the current exceeds apredetermined value. Suppose that the material to be used in a fusemelts when the current density rises to 360 A/cm2.
q1. a block with a mass of 20 g is pulled at a constant speed across a horizontal tabletop with a spring scale. the
determine the average value of the translational kinetic energy of the molecules of an ideal gas at a 47.6degc and b
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