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A battery is connected in series with a R = 0.31 ? resistor and an inductor, as shown in the figure below. The switch is closed at t = 0. The time constant of the circuit is ? = 0.20 s, and the maximum current in the circuit is I = 7.9 A. Find the following. (a) the emf of the battery V (b) the inductance of the circuit mH (c) the current in the circuit after one time constant has elapsed A (d) the voltage across the resistor and the voltage across the inductor after one time constant has elapsed resistor V inductor V
An Atwood's machine consists of blocks of masses m1 = 11.0 kg and m2 = 21.0 kg attached by a cord running over a pulley as in the figure below. The pulley is a solid cylinder with mass M = 8.60 kg and radius r = 0.200 m. The block of mass m2 is allow..
A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. What is the maximum speed of the pendulum
29.0g of copper pellets are removed from a 300?Coven and immediately dropped into 110mL of water at 23.0?C in an insulated cup. What will the new water temperature be
A 56.0kg cheerleader uses an oil-filled hydraulic lift to hold four 110kg football players at a height of 1.30m. find the diameter of the football players' piston
What is the reading of spring scale
Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 5.04 10-6 kg. Determine the charge magnitude
A simple pendulum has a period of 2.5 s. (a) What is its period if its length is made four times larger? (b) What is its period if the mass of the suspended bob is made two times larger?
A wire of length 0.72 m and cross-sectional area 2.7 cm2 is stretched elastically by an amount 1 cm. Calculate the work done in stretching the wire
At our distance from the Sun, the intensity of solar radiation is 1370 W/m2. The temperature of the Earth is affected by the greenhouse effect of the atmosphere.
Objective questions based on work, energy, power.
A street light is supported by two wires and each makes a different angle from each other. Find the tension in each wire if the street light has a mass of 60.0 kg
A 310kg wooden raft floats on a lake. When a 75kg man stands on the raft, it sinks 3.20cm deeper into the water. When he steps off, the raft vibrates for a while.
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