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Suppose that a uniform magnetic field is everywhere perpendicular to this page. The field points directly upward toward you. A circular path is drawn on the page. Use Ampère's law to find net
Through what angle must the door rotate so that the magnetic flux that passes through it decreases from its maximum value to 1/6 of its maximum value? Give your answer in degrees, not radians.
A turntable must spin at 33.0 rpm (3.46 rad/s) to play an old-fashioned vinyl record. How much torque must the motor deliver if the turntable is to reach its final angular speed in 2.5 revolutions,
Ignoring relativistic corrections, what field magnitude is necessary to deflect the beam to the side of the screen?
The beam's length is 1.30 m and the sign's dimensions are 1.00 m horizontally 0.80 m vertically. What is the minimum angle that you can have between the beam and cable?
There is no slipping as the rope unwinds from the cylinder, and there is no slipping between the rope and the pulley. Find the maximum angular velocity of the cylinder, i.e. just as the spring contr
The charged rod is then withdrawn. Is the sphere then positively charged, negatively charged, or neutral?
A 10-cm-long thin glass rod uniformly charged to 9.00 and a 10-cm-long thin plastic rod uniformly charged to - 9.00are placed side by side, 4.40 apart. What are the electric field strengths to at di
A wire of arbitrary shape, which is confined to the x-y plane, carries a current I from point A to point B in the plane. Show that if a uniform magnetic field B perpendicular to the x-y plane is pre
A 3250 kg open railroad car coasts along with a constant speed of 10.6m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.40kg/min gnoring friction with the tracks
A well-insulated electric water heater delivers 3.10*106cal to its tank of water in 35.0 minutes. Find the resistance of its heating element, which is connected across a 120V potential difference.
Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. Why does the car's mass not matter?
As a 15000 kg jet plane lands on an aircraft carrier, its tail hook snags a cable to slow it down. The cable is attached to a spring with spring constant 60000 N/m. If the spring stretches 30 m to
(a) How much work is done to bring this wheel from rest to a speed of 118 rpm in a time interval of 26.0 s? (b) What is the applied torque on the flywheel (assumed constant)?
One section, having a mass of 4.60×105, is blown straight backward with a speed of 2.20×106. A second piece, with mass 7.80×105, continues forward at 1.30×106. What is the spee
The power consumption in watts is given by P=IV, where P is the power used, I is the current, and V the voltage. How much current, in Amps, will flow from the power supply?
Find the resultant gravitational force exerted by the other two objects on the object at the origin
(a) Find the rod's kinetic energy at its lowest position (in Joules) (b) Find how far above that position the center of mass rises. (in meters)
What is the instantaneous angular velocity of the disk at the end of the 8.0 s? (in radians/sec) (d) Assuming that the acceleration does not change, through what additional angle will the disk turn
A 10-turn square coil 0.50 m on a side lies in the xy-plane. A uniform magnetic field with magnitude 1.0 T in the negative z-direction changes steadily to 3.0 T in the positive z-direction, a proces
Use conservation of energy to find the spring constant of the piston if they fall 64m, 40m of which the piston is pushing up on the platform, with 50% losses to heat the air in the piston. There wil
A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. (Hin
A good baseball pitcher can throw a baseball toward home plate at 83 mi/h with a spin of 1625 rev/min. How many revolutions does the baseball make on its way to home plate? For simplicity, assume th
A person is to be fitted with bifocals. She can see clearly when the object is between 30 cm and 1.5 m from the eye. Assume that the glasses will be worn so that the lenses are 2.0 cm from her eyes.
(a) Find the rod's kinetic energy at its lowest position (b) Find how far above that position the center of mass rises.