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A machine shop has 120 equally noisy machines that together producean intensity level of dB. If the intensity level must be reduced to86dB, How many machines must be turned off?
two charges are placed between the plates of a parallel plate capacitor. one charge is q1 and the other is q2 4.50
An object initially at rest moves a distance x when a force F is applied for time t. How far will the object move of a force of 2F is applied for the same time t
q1. a roller coaster 305 kg moves from a 5.00 m above the ground to b 23.0 m above the ground two non conservative
When ultraviolet light with a wavelength of 250 nm is incident on a particular metal surface, What is the threshold frequency for this particular metal
Consider a hypothetical universe in which the electron hasspin 3/2 rather than spin 1/2. Draw n enegy level diagram for the n=3 states of hydrogen,neglecting fine structure and hyperfine strucure. Label the states by the appropriate quantum nubers..
Two free charges(+)q and (+)4q are separated by a distance l meters. find the magnitude,sign and location of a third charge which makes the system in equilibrium
An airplane with a speed of 40 m/s isclimbing upward at an angle of 52°with respect to the horizontal. When the plane's altitude is840 m, the pilot releases a package. Calculate the distance along the ground,measured from a point directly beneath ..
When only a resistor is connected across the terminals of an ac generator (102 V) that has a fixed frequency, there is a current of 0.495 A in the resistor. calculate the impedance of the series combination
What is force necessary on one end of apparatus in order to lift the car? How much work is done lifting the car?
One of the limitations on the design of modern windmills for the generation of electricity is that the tip of the blades must not exceed the speed of sound in air, What is the acceleration of the blade tips
You throw a ball vertically upward from the edge of the roof of the Bisdorf building with a speed 15.0 m/s. Find a) the position and velocity of the ball 1.00 s after leaving your hand.
A block of mass m = 600 g is released from rest and slides down a frictionless track of height h = 59.9 cm. What is the value of the spring constant k
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