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1. The fig. shows cross section of a garage door which is a uniform rectangular panel 8 x 8 ft ans weighing 200 lb. The door carries two spring assemblies, one on each side of the door, like the one shown. Each spring has a stiffness of 50 lb/ft, and is unstretched when the door is in the open position shown. If the door is released from rest in this position, calculate the velocity of the edge at A as it strikes the garage floor.
2. The centre of the 200 lb wheel with centroidal radius of gyration of 4 in. has a velocity of 2 ft/sec down the incline in the position shown. Calculate the normal reaction N under the wheel as it rolls past position A. Assume that no slipping occures.
A swimming pool is 5m long, 4m wide and 3m deep. Compute the force exerted by the water against the bottom and either end. Do not include the force due to air pressure.
A certain lightbulb filament when hot has a resistance of 205 ?. The potential difference across the filament at a certain instant is standard household voltage, 120 V. What current is flowing through the bulb at that time
In the Bohr model, the electron is imagined to move in a circular orbit about a stationary proton. If the speed of the electron were7.9 multiplied by 105 m/s, what would be the corresponding orbital radius?
a string is wound tightly around a fixed pulley whose radius is 5.0 cm. as the string is pulled the pulley rotates
A player passes a basketball to another player who catches it at the same level from which it was thrown. What was the initial direction of the ball
Suppose the G-string of a guitar is 3.3 m long and has a linear density of 87.4 mg/m. What is the fundamental wavelength of the G-string for the guitar
If the frequency is variable and the length of the closed (at both ends) tube is fixed at 45 cm, sketch the plastic tube showing the position of the nodes and anti-nodes for the three lowest resonant.
A 200 kilogram roller coaster car travels over the top of a 40-m high hill (Hill A) traveling at 10 meter per second. Obtain the speed of the car at the top of the second hill
A stunt man drives a car at a speed of 20 m/s off a 24-m-high cliff. The road leading to the cliff is inclined upward at an angle of 20? How far from the base of the cliff does the car land
1. a car with an initial velocity of 4.0ms accelerates at a rate of 2.0 ms2 for 10.0s. how far does the car travel
suppose that visible light enters a Plexiglas cube containing water at a 20o angle of incidence, travels through the water and exits the cube.
a 18 cm tall object is placed in front of a concave mirror with a radius of 26 cm. the distance of the object to the mirror is 74 cm. Calculate the magnitude of the image height
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