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A resistor with resistance 510 ? is in a series with a capacitor of capacitance 6.5 × 10-6F. What capacitance must be placed in parallel with the original capacitance to change the capacitive time constant of the combination to three times its original value?
projectile is launched with an initial speed of 40.0 m/s at an angle of 20.0° above the horizontal. What is the projectile's velocity at the highest point of its trajectory
A sphere of radius r starts from rest and rolls without slipping along a curved surface, Find the final speed v of the sphere's center of mass
How many revolutions does wheel make throughout the time
Two point charges of equal magnitude are 7.3cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 40N/C . Find the magnitude of the charges.
A spacecraft approaching the earth launches an exploration vehicle. After the launch, What is the speed of the exploration vehicle relative to the spaceship
A turntable is a uniform disc of mass 1.2 kg and radius1.3 *10^-1 m . The turntable is spinning at a constant rate of f0 = 0.5 Hz. What is the magnitude of the frictional torque
A vulture circles around its prey and moves in a horizontal circle of radius 45 m with a speed of 15 m/s. at what angle should the vulture be banked so that it does not tend to slip sideways
Four vectors A,B,C ,D and are shown (not to scale). Vector A has magnitude 23.0 and acts at an angle of 14.7 degrees with respect to the positive x axis. find the magnitude and direction of the resultant vector R
A typical laboratory centrifuge rotates at 4000 rpm. Test tubes have to be placed into a centrifuge very carefully because of the very large accelerations. What is the acceleration at the end of a test tube that is 10 cm from the axis of rotation
A new record for running the stairs of the Empire State Building was set on February 3, 2003. If the height gain of each step was 0.20 m , and the mass of the runner was 72 kg, what was his average power output during the climb
In each cycle of its operation, a refrigerator removes 8 J of heat from the inside of the refrigerator and releases 22 J of heat into the room. How much work per cycle is necessary to operate this refrigerator.
What is size of the gravitational force on the moon
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