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To focus a camera on objects at dissimilar distances, the converging lens is moved toward or away from the image sensor, so a sharp image always falls on the sensor. A camera with a telephoto lens (f=200.00mm) is to be focused on an object located first at a distance of 3.5 m and then at 50.0 m. Over what distance should the lenses be movable?
Some bacteria are propelled by biological motors that spin hair-like flagella. How long does it take the motor to make one revolution
As an electron moves through a region of space , its speed decreases from 8*10^6 m/s to 3*10^6 m/s. Through what potential difference did the electron move
A farmer named Ben attempts to remove an 80-kg rock from his field. He applies a force of 789 N for 10 seconds but could not move the rock. How much work has he done
A simple model of the Earth includes a dense spherical core of radius 4200 km and a less dense spherical shell of thickness 2180 km, determine the rotational kinetic energy of Earth
Suppose the projectile is traveling 85.0 m/s at its maximum height of y = 272 m. Explain how much work has been done on the projectile by air friction?
An electrical cable consists of 184 strands of fine wire, each having 3.47 µ? resistance. What is the resistance of the cable
A small single r=1mm is placed coaxially at the center of a long solenoid n=500 tunrs per cm. the solenoid carries a current i=7sin(wt) a) what is the magnetic field through the small coil? b) What is the flux though the small coil? c) What is the ra..
Martha travels 25 miles north on her bike. Then, she travels 25 miles due east. What is Martha's displacement
a lawn roller is pushed across a lawn by a force of 115newtonsalong the direction of the handle, which is22.5o above the horizontal. what distance is the roller pushed
Two canoes are tied together and traveling down a river with the current. Spotting a waterfall, the two canoeists cut the rope, What is the combined mass of this canoe and rider
How many kilograms of air do you exhale? Assume that the density of air is 1.3 kg/m3.
A heat engine that is 58.6% efficient does 235.4 kJ of work. How much thermal energy input was required to perform this work
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