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A photographer uses his camera, whose lens has a 50 mm focal length, to focus on an object 3.5m away. He then wants to take a picture of an object that is 30cm away.
How far must the lens move to focus on this second object? In What units?
A drop of water on a countertop reflects light from a flower held 2.4 cm directly above it. The flower's diameter is 1.8 cm, What is the focal length of the water drop
A certain airplane has a speed of 250.0 km/h and is diving at an angle of 30.0° below the horizontal when the pilot releases a radar decoy. The horizontal distance between the release point and the point where the decoy strikes the ground is 700 m..
An ambulance driver traveling at 33.0 m/s honks his horn as he sees a motorist ahead on the highway, Calculate the proper frequency of the ambulance's horn
The Doppler effect can be used to measure flow rates in blood. A sound wave is transmitted into a vein or an artery, What is the expected frequency shift
It is claimed that if a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, Find the minimum speed of a lead bullet
A block of mass m =2.00kg is released from rest at h=0.300 m from the surface of a table at the top of a theta=50.0 degree incline as shown below. How far from the table will the block hit the floor
Use the blackbody radiation law to estimate the wavelength of maximum intensity for the light from the sun's photoshere
two automobiles are equipped with the same single-frequency horn. when one is at rest, What is the frequency the horns emit
An ideal 0.15-H inductor and a capacitor are connected in series with an ideal 60-Hz generator. Find the capacitance and the rms current in the circuit
A closely wound, circular coil with radius 2.10cm has 830 turns. What must the current in the coil be if the magnetic field at the center of the coil is 5.00×10?2
A whale swims due east for a distance of 3.8 km, turns around and goes due west for 7.9 km, What is the total distance traveled by the whale
A 352-kg motorcycle is accelerating up along a ramp that is inclined 30.0º above the horizontal. Find the magnitude of the motorcycle's acceleration
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