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An RC circuit contains a resistor of value R = 430 ? and a capacitor with C = 0.05 F. After fully charging the circuit with voltage V1, how long would it take to discharge the capacitor to 15% of V1?
A rock of mass 33 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 242 N. What is the magnitude of the acceleration of rock.
Three resistors, with values of 3.0, 6.0 and 12.0 ?, respectively, What is the overall resistance of this combination
A certain freely falling object requires 1.56 s to travel the last 37.0 m before it hits the ground. From what height above the ground did it fall.
The temperature of the surface of a certain star is 7500K. Most hydrogen atoms at the surface of star are in the electronic ground state. What is the approximate fraction of hydrogen atoms that are in the first excited state (and therefore could e..
What is the Professors initial velocity. He is pushed a distance 3.00 m along the incline by a group of students who together exert a constant horizontal force of 595 N. The professor's speed at the bottom of ramp is 1.70 m/s.
A lens with an index of refraction of 1.60 is to be coated with a material (n = 1.39) that will make the lens nonreflecting for yellow-orange light (? = 515 nm) normally incident on the lens
a little girl and her father are both playing on a merry go round in the park. what is the average angular velocity of the father
a car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is traveling due west at 20 m/s. What is the direction of the car's average acceleration over this period?
What is the charge q. suppose the speed of sound in air to be 343 m/s.
The excess internal energy of metabolism is exhausted through a variety of channels, such as through radiation and evaporation of perspiration. Calculate the rate at which you lose energy by exhaling humid air
A spherical Van de Graaff ball of radius 0.15 m is charged to 500,000 Volts. It is spinning at 60 rpm; calculate the magnitude of its magnetic moment
An oscillating block-spring system has a mechanical energy of 1.00 J, an amplitude of 9.9 cm, and a maximum speed of 1.13 m/s. Find the spring constant
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