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A capacitor is discharged through a 20 \Omega resistor. The dischargecurrent decreases to 23\% of its initial valuein 1.9 ms. What is the value of the capacitor?
A certain heat engine does 8.5 kJ of work and dissipates 8.50 kJ of waste heat in a cyclical process. What was the heat input to this engine
a window washer is standing on a scaffold supported by a vertical rope at each end. the scaffold weighs 200 n and is
Neutron stars consist only of neutrons and have unbelievably high densities. Find the density of such a star
A proton is moving in a circular orbit in a uniform magnetic field perpendicular to the orbit plane. calculate the magnetic force on the proton
Calculate the number of coulombs of positive charge in 285 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)
Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health, What is the resistivity of the leaf tissue
A wire (mass = 50 g, length = 40 cm) is suspended horizontally bytwo vertical wires which conduct a current I = 8.0 A, What is the tension in eitherwire
A compact disc (CD) contains music on a spiral track. Music is put onto a CD with the assumption that, during playback, Find the constant tangential speed at which music is detected
a an ionization chamber is used with an electrometer capable of measuring 50microa. calculate the rate at which
A cart of mass m1 = 0.500 kg moves with a velocity of 0.900 m/s to the right on a frictionless track. It collides with another cart of mass m2 = 0.500 kg at rest. Car m1 stops and m2 moves in the direction that m1 was traveling. What is the magnitude..
birds resting on a high-voltage power lines are a common sight. a certain copper power line carries a current of 52.7 a
The magnitude of the tidal force exerted on an object of mass m and length a is approximately 4GmMa/r3. find the tidal force exerted on your body by the black hole
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