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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)?
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 7.30 m to a store. At what angle is the escalator inclined above the horizontal
Two blocks, each with weightw, are held in place on a frictionless incline in terms ofwand the angleaof the incline. Calculate the magnitude of the force that the incline exerts on each block in N
The leader of a bicycle race is traveling with a constant velocity of +11.8 m/s and is 9.20 m ahead of the second-place cyclist. How much time elapses before he catches the leader
One solenoid is centered inside another. The outer one has a length of 46.0cm and contains 6600 coils, Find the emf induced in the inner solenoid
A charge q= +5.80 x 10^-6 is located at the center of a regular tetrahedron (a four sided surface). find the electric flux through one face of the tetrahedron
A transverse wave on a string is described by the following wave function. y =0.085 sin((pie/12x) +(5piet)), What is the speed of propagation of this wave
A friend tells you that when he takes off his eyeglasses and holds them 18cm above a printed page, what is the focal length of your friend's glasses
Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health, determine the maximum emf that can be generated around the perimeter of a cell in this field
A hot saturated solution of a material to be crystallized is passed through a piece of fluted filter paper in a long-stemmed funnel. What could go wrong with this procedure
A horizontal wire of 0.52 m carrying a current of 8.2 A is placed in a uniform external magnetic field. Determine the magnitude of the external magnetic field
(a) Determine the magnitude and direction of the electric field at the location of charge q. (Use k_e for the Coulomb constant and q and a as necessary.) Magnitude Direction ° (counterclockwise from the horizontal) (b) What is the total electric f..
What is the minimum uncertainty in the speed of an electron that is known to be somewhere between 0.065nm and 0.30nm from a proton
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