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A photographer uses his camera, whose lens has a 40mm focal length, to focus on an object 5.0m away. He then wants to take a picture of an object that is 50cm away. How far must the lens move to focus on this second object?
A resonant circuit in a radio receiver is tuned to a certain station when the inductor has a value of 1.00 µH and the capacitor has a value of 1.90 pF. Find the frequency of the radio station
A motorist driving a 1200-kg car on level ground accelerates from 20.0 m/s to 30.0 m/s in a time of 5.7 s. determine the average mechanical power in watts the engine must supply during this time interval
Light traveling in air is incident on the surface of a block of plastic at an angle of 61.0degree to the normal and is bent so that it makes a 46.5 degree angle with the normal in the plastic. Find the speed of light in the plastic.
Suppose that you want to find the equation for a line that passes through the two points (0,3) and (4,9). What is the slope of this line
An electron in an oscilloscope is accelerated as a result of the potential difference between the cathode and anode. determine the voltage drop from cathode to anode
A cosmic-ray proton in interstellar space has an energy of 25.0 MeV, What is the magnetic field in that region of space
The end point of a spring vibrates with a period of 1.9 seconds when a mass m is attached to it. When this mass is increased by 9.630×101 kg, the period is found to be 4.1 seconds. Find the value of m.
a bullet of mass 50 g traveling at 400 m/s due north strikes a rock of mass 500 g at rest and ricochets off the rock going due east. How much energy was lost in the collision
After 6 L of solvent have passed through the column, the yellow band still has not traveled down the column appreciably. What should be done to make this experiment work better
A spacecraft approaching the earth launches an exploration vehicle. After the launch, an observer on earth sees the spacecraft approaching at a speed of 0.45c and the exploration vehicle approaching at a speed of 0.80c. What is the speed of the explo..
Two particles each have a mass of 7.1 x 10-4 kg. One has a charge of +6.7 x 10-6 C, and the other has a charge of -6.7 x 10-6 C. How fast is each particle moving when the separation between them is one-half its initial value
Steam enters a nozzle operating at steady state with p = 40 bar and T =400oC, and a velocity of 10 m/s. Determine the exit area of the nozzle
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