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Question: A uniform 300-N trapdoor in a ceiling is hingedat one side.
a) Find the net upward force needed to begin toopen it, if the upward force is applied at the center.
b) Find the total force exerted on the door bythe hinges, if the upward force is applied at the center.
c) Find the net upward force needed to begin toopen it, if the upward force is applied at the center of the edgeopposite the hinges.
d) Find the total force exerted on the door bythe hinges, if the upward force is applied at the center of theedge opposite the hinges.
At the same moment, one rock is thrown upward at 4.5 meter per second and another thrown downward at 3.4 meter per second. Determine the relative velocity of the first rock
A man strikes a nail with a 1kg hammer. The speed of the hammer just before it strikes the nail is 5m/s, What is the force exerted on the nail by the hammer
Suppose you have a concave spherical mirror with a focallength of 10 cm. What is the radius of curvature of the mirror
Two children, 30kg and 50kg sit on opposite ends of a 4m longuniform see-saw with mass 80kg. How far from the center ofmass of the see-saw, and closer to which child should the fulcrumbe placed in order to get an equilibrium?
A nearsighted patient's far point is .699m from her eyes. She is able to see distant objects in focus when wearing glasses with a refractive power of -1.51diopters. What is the distance among her eyes and the glasses?
Are wave speed and pulse speed the same? Explain... If I were to create standing waves with a 4m spring with anamplitude of 30cm, how would the period, wavelength and wave speedbe affected if I were to decrease the amplitude ?
A piece of a cloth is found to contain 15% of the C-14 present in a similar material today. How old is this cloth
A violinist places her finger so that the vibrating section of a 1.00g/m string has a length of 40.0 cm, then she draws her bow across it. What is the tension in the string
If he can throw the apple only with a speed of 10 m/s, find the minimum and maximum angles of projection for successful shot. Assume that the point of projection and the edge of the boat are in the same horizontal level.
Ag is often used for Fabry-Perot mirror coating material. Calculate the reflectivity, R (not r ), of the two mirrors that are needed to filter two wavelengths that are 1nm apart, 50 GHz apart, 1GHz apart. What is a typical realizable Reflectivity f..
Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground while he slows down.
How many binary evaluations are needed to be sure with odds of a billion to one that the correct entry has been retrieved?
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