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A worker pushes a cylindrical drum of mass 140 kg and radius 40cm over a 20cm high curb. Calculate the minimum horizontal force he needs to apply if he pushes the drum 10 cm from the top.
a crowbar 2m long is used to lift a rock 800n. if the fulcrum is 0.25m from where the crowbar touches the rock, how much effort must be applied to move the rock
An atomic nucleus has a charge of +40e. An electron is 10-9 m from the nucleus. What is the force on the electron
The output stage of a high-fidelity amplifier has an internal impedance of 162 ohm. determine what must be the turns ratio of the output transformer for maximum power transfer
An circuit consists of a 50Ω resistor in series with a 60.0 Hz source. A voltmeteracross the resistor reads 34.0 V. What is the rms current in this circuit?
Consider a large 1.54 V carbon-zinc dry cell used in a physics lab to supply 2.15A to a circuit with an internal resistance of 0.12 ohms. How much electrical power does the cell produce
Three identical +1.00 μC charges are on the vertices of an equilateral triangle. Each side measures 0.500 meter. Find the total electrical potential energy for this arrangement of charges
After a hard rain, you walk out into the parking lot and notice an oil sheen on top of a puddle of water. What is the minimum thickness of the oil
A proton in the upper atmosphere moves at 8.6×105m/s , perpendicular to Earth's magnetic field, Find the curvature radius of the proton's trajectory
An elevator weighing 20,000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upwards at a rate of 3.00 m/s2
a member of an aircraft maintenance team crew wears protective earplugs that reduce the sound intensity by a factor of
A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an angle of 15.0 degrees with the forward direction of motion. how much work does the rope do on the skier
A resistor (R = 780 ohm), a capacitor (C =0.16 µF), and an inductor (L= 3.50 H) are connected in a series across a 60 Hz AC source for which ΔVmax = 150V. Determine the average power delivered to the circuit
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