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A grade school student plans to build a 34-power telescope as a science fair project. She starts with a magnifying glass with a focal length of 4.9cm as the eyepiece. What focal length is needed for her objective lens in meters?
A major motor company displays a die-cast model of its first automobile, made from 6.60 kg of iron. What mass of gold is needed to make the new model
Suppose a capacitor in a video camera has a capacitance of 26.0 ?F, how much potential energy is stored in the capacitor
A large boat with a weight of 70000 tons moves at constant speed due west. What is the net force on the boat.
An ideal gas initially at pressure 8.0 atm and temperature 300K expands adiabatically until its volume doubles. Find the final pressure and temperature
Two soccer players start from rest, 30 m apart. They run directly toward each other, both players accelerating. How much time passes before the players collide
A cannonball sits on top of a 10 meter cliff and is fired at a 10 degree angle with an initial velocity of 50 m/s. What is the maximum height of the cannonball relative to the ground? At maximum height what is the magnitude of the velocity? How lo..
At what angle to the surface must a diver submerged in a lake look toward surface to see the setting Sun just all along the horizon.
The focal length of the human eye is approximately 1.7 cm. What is the f-number for the human eye in bright light, when the pupil diameter is 3.0mm
Light of wavelength 420 nm is incident normally on a film of water 1.0 µm thick. The index of refraction of water is 1.33, What is the wavelength of the light in the water
At a certain point in a horizontal pipeline, the water's speed is 4.00{\rm m/s}, Find the gauge pressure at a second point in the line
A river steamboat travels 36 miles downstream in the same time that it travels 24 miles upstream. What is the currents speed
What is your displacement after running 2.8 {rm km} on Strawberry Fields, 1.4 {rm km} on Penny Lane, and 4.3 {rm km} on Abbey Road.
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