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Two spherical point charges each carrying a charge of 40 mC is attached to the two ends of a spring of length 20 cm. If its spring constant is 120 Nm-1, what is the length of the spring when the charges are in equilibrium?
A gas in a cylinder is held at a constant pressure of 2.20×10^5 Pa and is cooled and compressed from 1.70m^3 to 1.40m^3. Find the amount of the heat that flowed into or out of the gas
A woman stands on a scale in a moving elevator. Her mass is 60.0 kg, and the combined mass of the elevator and scale is an additional 802 kg, What does the scale read (in N) during the acceleration
a current of 0.97a flows through a copper wire 0.50mm in diameter when it is connected to a potential difference of 15
The magnetic field B at the center of a circular coil of wire carrying a current I (as in fig. 20-9) is where N is the number of loops in the coild, determine the magnetic field strength at the center of the coil
What mass (in grams) of steam at 100°C must be mixed with 403 g of ice at its melting point, in a thermally insulated container, to create liquid water at 87°C? The specific heat of water is 4186 J/kg•K. The latent heat of fusion is 333 kJ/kg, and..
A Carnot heat engine has a thermal efficiency of 0.615, and the temperature of its hot reservoir is 775 K. If 2375 J of heat is rejected to the cold reservoir in one cycle, what is the work output of the engine during one cycle?
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 1.20 10-10 T. How much energy does this wave carry through the window
A 0.004-kg bullet is fired into a 0.200-kg block of wood at rest on a horizontal surface. what is the speed of the bullet before impact
A 7 g bullet has a speed of 270 m/s and embeds itself into a 600 g block. How far does the block slide after the collision before coming to rest
The position of a 30 g ball is measured to be 27.3 cm +/- .004 cm (that is: the position is 27.3 cm with an uncertainty of .004 cm) What is the uncertainty in the velocity of the ball
Two skaters, one with mass 65 kilogram and the other with mass 40 kilogram, stand on an ice rink holding a pole of length 10 meter and negligible mass. Evaluate how far does the 40 kilogram skater move
A 0.380 kg steel ball makes an elastichead-on collision with a second ball initially at rest. What is the mass of the second ball
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