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A human eyeball is about 2.1 long, and the pupil has a maximum diameter of about 7.5 . What is the "speed" of this lens? (f-stop)
A neutron at rest decays into a proton and an electron. How much Kinetic energy (in MeV) are shared by the electron and proton? Can a proton decay into a neutron and positron?
A planet with a radius of 6.68 ×107 m has a gravitational field of magnitude 34.2 m/s2 at the surface. What is the escape speed from the planet
After falling from rest from a height of 26 m, a 0.5 kg ball rebounds upward, reaching a height of 16 m. If the contact between ball and ground lasted 1.6 ms, Evaluate average force was exerted on the ball?
When the displacement of a mass on a spring is 0.689 of the amplitude of its oscillation, what fraction of the mass's energy is kinetic energy
A certain cable car in San Francisco can stop in 10s while travelling at maximum speed. On one occasion, driver sees a dog a distance d m in front of the car and slams on the brakes instantly.
An iron heating coil for a burner on an electric range runs off a 240V circuit and produces 100 Watts of heat. Given a length of 1.2 m for the coil, find the diameter of the coil
A singly charged positive ion has a mass of 2.53 10-26 kg. After being accelerated through a potential difference of 270 V, the ion enters a magnetic field of 0.590 T, Calculate the radius of the path of the ion in the field
An object hanging in air, as in Figure A below, caused the scale to balance at 0.420 kg. When the object was submerged in water, what is the density of the object
A girl throws a rock horizontally with a speed of 12.0 m/s from a bridge. It falls 2.28 seconds before reaching the water below. How high is the bridge from the water? How far horizontally does the rock travel before striking the water.
A small glass bead has been charged to + 25nC . A tiny ball bearing 3.0cm above the bead feels a 1.8×10?2Ndownward electric force. What is the charge on the ball bearing
A physics TA pushes a 20.0-kg equipment cart at a constant velocity a distance of 24.0 m down the hall. determine the work done by the force of gravity acting on the cart
A defibrillator consists of a 16.7-µF capacitor that is charged to 9.0 kV. how much charge passes through the body tissues
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