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In astronomy it is common to expose a photographic plate to a particular portion of the night sky for quite some time in order to gather plenty of light. Before leaving a plate exposed to the night sky, Matt decides to test his technique by exposing two photographic plates in his lab to light coming through several pinholes. The source of light is 1.8 m from one photographic plate and the exposure time is 0.9 h. For how long should Matt expose a second plate located 4.4 m from the source if the second plate is to have equal exposure (that is, the same energy collected)?
What is constant acceleration
Light from the sun allows a solar cell to move electrons from the positive to the negative terminal, What is the emf of this solar cell
A pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing.
A boy throws a 1.5 kg rock upward. To do so the boy applies a constant 38.5 N force upwards on the rock from point a to point b. after that the rock continues upward to its highest height at point c.
A small object is placed to the left of a convex lens and on the optical axis. What is the position of the image formed by the lens
A 60kg pole vaulter running at 13m/s vaults over the bar. Her speed when she is above the bar is 0.7m/s. Neglect air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
Suppose a 76 kg person hangs vertically from a nylon rope. What radius must the rope have if its fractional increase in length is to be the similar as that of the spider's thread.
The coil of a galvanometer has a resistance of 21.6 ?, and its meter deflects full scale when a current of 5.58 mA passes through it. What is the maximum current that this ammeter can read
A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball
6 kg of an ideal gas is in a volume of 1 m3 at 250°C. The gas undergoes a constant pressure change of state until the temperature is 500°C. Find the pressure at the initial state
A child and sled with a combined mass of 48 kg slide down a snow-covered (and frictionless) hill. Find the kinetic energy at the top of the hill
What happens when a proton moves parallel to a magnetic field and when a proton moves perpendicular to a magnetic field
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