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One kilowatt an hour (kWh) is the amount of work or energy generated when one kilowatt power is supplied for a time of one hour. A kilowatt an hour is the unit of energy used by power companies when figuring your electric bill. Find the number of joules of energy in one kilowatt an hour.
An electron orbits a proton at a radius of 5.40 10-11 m. What is the magnitude of the magnetic field at the proton due to the orbital motion of the electron
A 9 kg mass slides to the right on a surface having a coefficient of friction 0.37 as shown in the figure. The mass has a speed of 5 m/s when contact is made with a spring (of con- stant 107 N/m)
A ball is launched at 4.43 m/s at an angle of 66 degrees above teh horizontal and the time of flight is 0.84 s, then what is the maximum height of the ball
a 5.0 micro c charge experiences a 0.45- n force in the positive direction. if this charge is replaced with a -2.7
A spring with an unstrained length of 0.071 m and a spring constant of 1.5 N/m hangs vertically downward from the ceiling. What is the magnitude of the external electric field
A record (mass 100g and radius 12cm) is rotating at a rate of 33rpm. What is the new rotational rate if angular momentum is conserved
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.30 x 10^11 m apart. What is the mass of the smaller star
Estimate the change in the Earth’s gravitational dipole moment, with respect to the Earth’s center, if the polar ice caps were to melt.
When a rifle is fired, the person firing the rifle absorbs the recoil. Consider an Olympic biathlete firing a competition rifle. What is the magnitude of the force felt by the athlete
two point charges lie along the y-axis. a charge of q1 -8.5 microc is at y 6.0 m and a charge of q2 -7.5 microc is
A 10.2 cm diameter loop of wire is initially oriented perpendicular to a 1.6T magnetic field. The loop is rotated so that its plane is parallel to the field direction in 0.21 seconds. What is the avg induced emf in the loop?
a small ball of mass m is attached to a very light string of length l that is tied to a peg at point p. what is the
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