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Interstellar space has a magnetic field on the order of 0.1 nT. Matter in this space is mainly Hydrogen atoms (about 1 per cubic centimeter) moving with speeds of about 1 km/s. Compare the energy in the magnetic field to the Kinetic Energy of the atoms.
A proton with an initial speed of 800000 is brought to rest by an electric field. What was the potential difference that stopped the proton
A lighted candle is placed 36 cm in front of a diverging lens. The light passes through the diverging lens and on to a converging lens of focal length 10 cm that is 5 cm from the diverging lens. Find the focal length of the diverging lens
A black wood stove with surface area 4.6 m^2 is made from cast iron 4.0 mm thick. What is the rate of heat loss by radiation from the stove
To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. What fraction of the specimen's apparent volume is solid
Steel train rails are laid in 12.2m -long segments placed end to end. The rails are laid on a winter day when their temperature is -2.00 oC. what is the stress in them on a summer day when their temperature is 33.0 oC
q1. a power supply passing throughout a resistor is supposed to deliver 22-v dc at a max current of 150ma. the
A spring with constant k=30N/m is used to shoot a block (mass 1kg) across a frictional horizontal surface. what is the force of friction acting on the block
A heat pipe is a device developed by NASA for efficiently transmitting thermal energy while in space. A heat pipe is to be constructed using a rigid pipe with a volume of 0.0002·m3, What is the specific and total internal energy of the water
if a 50 ohm toaster is connected in parallel to two 120 W bulbs and 120 V is applied across the light bulbs/toaster combination what is the current flowing through the toaster
A massless cylinder 49 cm long rests on a horizontal frictionless table. The cylinder is divided into two equal sections by a membrane, How far will the cylinder move if the membrane is removed
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern. A defibrillator passes 18 A of current through the torso of a person in 2.1 ms, How much charge moves during this time
A ballplayer standing at homeplate hits a baseball that is caught by another player at the same height above the ground from which it was hit. How high will the ball rise
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