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Assuming a planet of mass m moves around the Sun (with mass Ms) in a circular orbit of radius R,(a) find its rotation period(b) explain how the period changes if the mass of the planet is doubled
A uniform disc of mass m and radius R is rigidly mounted coaxially with a lightweight disc of radius r = R/2, to a horizontal shaft, on which combination is free to rotate frictionless. Light strings are wound in opposite directions about the cyli..
A drag racer, starting from rest, speeds up for 402 m with an acceleration of +21.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.75 m/s2. How fast is the racer moving 2.90 102 m after the parachute opens?
Consider an alternating current of the form i(t) sin(2pit), where t is the time elapsed measured in seconds. (a) at what times is the magnitude of the current largest? (b) if this current were applied to a resistor, at what times would the magnitude ..
Assume that the interior of the earth can be treated as an incompressible fluid in equilibrium. {HINT: Let ? denote the density; take ? to be a constant; ? = M/V.}
A irregular piece of metal has a dry mass of 5.7 kg. Once it is submerged it has an apparent mass of 2.4 kg. What is the density of the piece of metal
A horizontal force of 150 N is used to push a 42.5 kg packing crate a distance of 6.90 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. the work done by the 150 N force
During a 75-ms interval, a change in the current in a primary coil occurs. This change leads to the appearance of a 6.3-mA current in a nearby secondary coil. What is the change in the primary current
A 0.70-kg mass attached to a vertical spring of force constant 140N/m oscillates with a maximum speed of 0.40m/s, Find the maximum magnitude of the acceleration
A clothes dryer runs on 4400 W. If the dryer draws 20 A of current, what is the resistance of the dryer
At 12 volt battery is connected in parallel with a 100,200,and 500 resistors. How much current flows through each resistors
a motor applies a constant tension of 2.5 kN to a cable passing over a pulley, find the work done by gravitaional force action on the crate
Ironman is chasing a bad guy who is running at 7.2 m/s. When he is 143m behind the bad guy, How long does it take Ironman to catch the fellow
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