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A professor office door is 0.91 meter wide, 2.0 meter high and 4.0 centimeter thick: has a mass 25 kilogram: and pivots on frictionless hinges. A "door closer" is attached to the door and the top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5.2 N•m. Find the least force that you need to apply to door to hold it open?
A uniform ladder 5.0 m long rests against a frictionless,vertical wall with its lower end 3.0 m from the wall. How far along the ladder can the man climb
Calculate the internal energy of one mole of helium gas at a temperature of 260K. Assume ideal gas behavior
A total current of 10 Amp flows into a parallel combination of a 8 ohm and a 11 ohm resistor. What current flows through the 8 ohm resistor?
Determine how much work must be done to stop a 49000 kilogram airplane landing at 250 km/h? Make sure you input the correct sign for work
Assume that electrical attractions, rather than gravity, were responsible for holding the Moon in orbit around the Earth.
At the bottom of its path, the ball strikes a 3.80 kg steel block initially at rest on a frictionless surface. The collision is elastic. Find out the speed of the ball just after the collision ?
A ball on the end of a string is whirled around in a horizontal circle of radius 0.300 m. The plane of the circle is 1.10 m above the ground. Find the radial acceleration of the ball during its circular motion
On a planet that has no atmosphere a rocket 15.4 meter tall is resting on its launch pad. The acceleration due to gravity on this planet is 5.45 m/s^2. Find how long does it take the ball to reach the launch pad
How much work would be required to move a 0.50 microCoulomb test charge from a point midway between them to a point 12 cm closer to ether of the charges?
You are given a pendulum composed of a 0.024 kg mass on the end of a 0.60 m long massless string. Find the gravitational potential energy of the mass
Spacing in most book are generally done in units of points andpicas: 12 points = 1 pica, and 6 picas = 1 inch. If a figure wasmisplaced in the page proofs by 1.30 cm, what was the misplacement in both picas and points?
A converging lens has 31.3 cm focal length, and is placed 20.9 cm behind a diverging lens. Parallel light strikes the diverging lens, What is the focal length of the diverging lens in cm
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