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A professor's office door is 0.96m wide, 2.2mhigh, 4.0cm thick; has a mass of 26kg , and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5.8N?m .What is the moment of inertia of the door? If you let go of the open door, what is its angular acceleration immediately afterward?
Ball 1, with a mass of 140g and traveling at 11.0m/s , collides head on with ball 2, which has a mass of 310g, What are the final velocities of each ball if the collision is perfectly inelastic
one solenoid is centered inside another. the outer one has a length of 45.0 cm and contains 6800 coils, what is the EMF induced in the inner solenoid
A laser has a 200-W, 1.0 mm^2 cross-sectional area beam. find the amplitude of the electric and magnetic fields
The ball curves because it is spinning at an average angular velocity of 370 rev/min (assumed constant) on its way to the catcher's mitt. Illustrate what is the angular displacement of the baseball (in radians) as it travels from the pitcher to t..
What is the magnitude
A speedboat moving at 33.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of ?3.20 m/s2 by reducing the throttle. (a) How long does it take the boat to reach the buoy? (b)What is the velocit..
A bird flies 25.0 m in the direction 55° east of south to its nest. What are the northward and westward components of the resultant displacement of the bird
Two bars of identical mass are at 30 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J / (kg • C°).
Density-Gravity Problem: a) Planet Vulcan has twice the mass of Earth and the same radius. What are its volume, density and surface gravity compared to Earth?
A function generator with output V(t) = 12cos(500t)V is connected with a resistor R = b15?, What is the maximum current passing through the resistor
A converging lens with a focal length of 5.0cm is to the left of a second identical lens. When a feather is placed 13cm to the left of the first lens, What is the separation between the lenses
At t=0, a 734 g mass at rest on the end of a horizontal spring (k= 113N/m) is struck by a hammer, Determine the amplitude, maximum acceleration and total energy
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