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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.
A prism has a vertex angle of 60° and an index of refraction of 1.52. What is the minimum angle of incidence, measured away from the vertex
A displacement, s, of an object as a function of time, t, is given by , Find an expression for the acceleration of the object
A uniform 2.45- kg spinning disk with a radius of 0.323 m is brought to rest by a brake-pad pressed against the side 0.226 m from the rotation axis. What frictional force was applied by the brake pad
An adult exerts a horizontal force on a sewing that is suspended by a rope of length L, holding it at an angle x with the vertical. The child in the swing has a weight W and dimensions that are negligible compared to L.
A uniform disk with a mass of 770 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz, What is the new rotational speed of the disk
A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Find the translational speed at the top
A bat is emitting a sound of 39KHz frequency while flying toward a flat wall. The bat is moving at1/50 of the speed of sound which is 343m/s. What freq does the bat hear reflected off the wall
A person on earth notices a rocket approaching from the right at a speed of 0.74c and another rocket approaching from the left at 0.52c. What is the relative speed between the two rockets
Estimate the change in COP of your electric food freezer when it is removed from your kitchen to its new location in your basement, which is 8 C° cooler than your kitchen. (Assume that the temperature in the kitchen is 20°C and that the temperature o..
A 54-kg water skier is being pulled by a nylon (Young's modulus 3.7 x 109 N/m2) tow rope that is attached to a boat. What is the change in length of the rope when the skier has an acceleration whose magnitude is 0.59 m/s2
Suppose a car is traveling at +16.8 m/s, and the driver sees a traffic light turn red. After 0.569 s has elapsed, calculate the stopping distance of the car
If a star has a peak emission in the infrared par of the spectrum, is it hotter or cooler than the Sun? What color would the star be
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