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1. A simple dc-motor is made up of a single coil rotor placed between two permanent magnets. The magnetic field between the magnets is 0.100 T. The cross-sectional area of the coil is 25 cm2. How many turns should the coil have so that the motor can supply a torque of 0.100 N-m?
A certain metal with atomic mass (2.1 x 10^-25)kg has an interatomic bond with length (2.3 x 10^-10)m and stiffness 42 N/m
How much work is needed to move a 120-kg refrigerator.
Find the speed an alpha particle requires to come within 2.6 ? 10-14 m of a uranium nucleus
What are the volume and linear charge densities.
A 500 \mu F capacitor is connected across a 1.25 H inductor. At a certain time, the charge on the capacitor is zero and the current is 0.347 A. What is the peak charge on the capacitor
An unstable elementary particle comes in two varieties, one with positive and one with negative electric charge, What is the difference (R+)-(R-) between the two rates, with its error
Is the momentum change identical? If not, the ball would have the larger momentum change throughout the collision with the wall?
An argon-ion laser produces a cylindrical beam of light whose average power is 0.662 W. How much energy is contained in a 1.88-m length of the beam
At time t = 0 s, a puck is sliding on a horizontal table with a velocity 3.60 m/s, 35.0° above the +x axis, What is the velocity of the puck at time t = 1.50 s
A girl whirls a stone attached to a string 1.0m long in a circle with uniform speed. calculate the force provided by the rope to maintain the circular motion of the stone if the mass of the stone is 30.0g
An archeologist on a dig finds a fragment of an ancient basket woven from grass. Later, What is the age of the basket
8g of helium at an initial temperature of 280Kinteracts thermally with 7.0g of oxygen at an initial temperature of 550K What is the final thermal energy of each gas
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