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A charged capacitor is connected to a resistor and a switch as in the figure below. The circuit has a time constant of 2.5 s. After the switch is closed, the charge on the capacitor is 90% of its initial charge.
a) Find the time it takes to reach this charge.
150ml of water at 20.0C is placed in the freezer compartment of a refrigerator with a coefficient of performance of 6.00. How much heat energy is exhausted into the room
A parallel plate capacitor of capacitance 4.9 µF has the space between the plates filled with a slab of glass with ? = 4.0. Find the charge on the plates after the glass is removed
A 2.50-kg Pendulum is attatched to a string 11.4m stringis pulled aside until it is.386m above its lowest position and released. The pendulum is designed to emit sound waves at a frequency of 440 Hz; However, as it swings toward and away from an o..
an object is moving with velocity 18.8 ms along a line making an angle of 218deg measured counterclockwise from the x
A 0.196-µF capacitor is connected to a 246-V rms ac source at 44.5 Hz. What is the rms current through the capacitor
A solenoid of radius 1.1 cm produces a magnetic field at its center is 0.28 T. What is the magnetic flux by the center of the solenoid.
two 2.0-cm-diameter insulating spheres have a 5.50cm space between them. one sphere is charged to 94.0nc the other to
A cart is propelled over an XY plane. Its initial velocity has components Vx= 8 m/s and Vy= 12 m/s when it goes past (0,0). The time is t=0. what is the displacement at this time
Jack and John are standing 6m apart from each other playing soccer. Jack kicks the ball to John and John kicks it back immediately. What is the speed of the ball when it's kicked back to Jack
A flywheel of mass 185 kg has an effective radius of 0.60 m (assume the mass is concentrated along a circumference located at the effective radius of the flywheel). (a) How much work is done to bring this wheel from rest to a speed of 120 rpm in a..
At time t=0 a grinding wheel has an angular velocity of 26.0 rad/s. It has a constant angular acceleration of 29.0 rad/s^2 until a circuit breaker trips at time t = 2.50 s. From then on, the wheel turns during an angle of 440 rad as it coasts to a..
A cat drops from a shelf 4.5ft above the floor and lands on all four feet. His legs bring him to a stop in a distance of 12cm. Calculate how long it takes him to stop
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