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The unbalance of the rotor of a 400-lb motor is equivalent to a 3-oz Problems weight located 6 in. from the axis of rotation. In order to limit to 0.2 lb the amplitude of the fluctuating force exerted on the foundation when the motor is run at speeds of 100 rpm and above, a pad is to be placed between the motor and the foundation. Determine
(a) the maximum allowable spring constant k of the pad,
(b) the corresponding amplitude of the fluctuating force exerted on the foundation when the motor is run at 200 rpm.
A light bulb is rated at 60W, 120 V. how many electrons flow through the bulb per second and find the resistance of the bulb
Block A is dropped from a height of 2 m. An identical block B slides frictionlessly down a ramp of height 2 m inclined at 30°. Which block is travelling fastest at the bottom of the ramp
The spacing between the lines in the pure rotational spectrum of 11B-2H (numbers are superscripts) is 3.9214E-11 s^-1, Calculate the bond length of this molecule
The springs of a 1200 kg car compress 5.0 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations
a particle p with mass 9kg has position vector rr2.5m and velocity vv45.0 ms. it is acted on by force f f10.0 n. all
A billiard ball A moving at 5.00m/s hits another ball B, initially at rest, of the same mass. Find the velocity (magnitude and direction) of the second ball after the collision
What is the amount of the normal force on the charge on the surface in Newtons, when including both the weight of the object and the electric force on it?
In an amusement park "Rocket" ride, cars are suspended from 4.25 m long cables attached to rotating arms at a distance of 6.00 m from the axis of rotation. What would the angular speed be if the angle of the "Rocket" cars were changed to 60o from v..
Your forehead can withstand a force of about 6.0kN before fracturing while your cheekbone can only withstand about 1.3 kN. what is the magnitude of the balls deceleration
If 2 hertz waves on a rope travel at 6 meter per second, determine what is their wavelength
David Purley, a racing driver, survived deceleration from 173 km/hto 0 km/h over a distance of .660 m when his car crashed. find the average force acting on him during the crash
An LC circuit is built with a 50mH inductor and an 8.0pF capacitor, The capacitor voltage has its maximum value of 40V at t=0s, What is the inductor current at that time
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