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Two capacitors are identical, except that one is empty and the other is filled with a dielectric (κ = 4.50). The empty capacitor is connected to a 12.0-V battery, What must be the potential difference across the plates of the capacitor filled with a dielectric so that it stores the same amount of electrical energy as the empty capacitor?
If you were on a spaceship traveling a 0.5c away from a star, at what speed would the starlight pass you
In a simple series circuit a battery is connected through an ammeter to an electriclamp. A voltmeter is connected parallel to the lamp. The ammeterreads 0.75 A and the voltmeter 50 V. What is the resistance of the lamp neglecting the current drawn..
a parachutist with a camera descends in free fall At a speed of 14m/s. What is the velocity of the camera just before it hits the ground
A resistor with R = 4.0 kohm is placed in series with a 240 V battery, an open switch, and an inductor having L = 36.0 mH. At some time after the switch has been closed, the current in the circuit is 15.0 mA. At this same instant in time, what is the..
A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 5.0. Calculate the intial kinetic energy of the system
What is the apparent weight of a cube of iron of volume 0.2 m3 when it is submerged in water? The density of iron is 7800 kg/m3
A wheel rotates with a constant angular velocity of 2.00 rad/s. Find the tangential speed of the point, and compute its radial acceleration from the relation
What least horsepower must a motor have to be able to drag a 280 box along a level floor at a speed of 1.05 if the coefficient of friction is 0.50.
A rock thrown horizontally from the top of a radio tower lands 22.0 m from the base of the tower. how high is the tower
Steam locomotives have an eff of 17% and operate with hot steam temp of 425C. A.) what is the cold temp B.) what is the max eff if the cold temp 150C
Kenny throws a basketball which has an initial speed v0. When the ball gets to its minimum speed sometime before striking the ground, What was the initial angle of the ball
A uniform rod of weight W is supported horizontally by two bricks at its ends. Calculate the Force on the other support immediately thereafter, it should be in terms of W
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