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A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 56.11 diopters, and the lens-to-retina distance is 1.791 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard is 6.44 cm high, what is the height of the image on her retina?
A single convex lens projects a focused image of an object onto a screen. If the lens is 15 cm from the object and and 36 cm from the screen, what is the focal length of the lens
What would be the equilibrium temperature when a 227 block of copper at 265 is placed in a 155 aluminium calorimeter cup containing 844 of water at 14.50.
As an object is heated to a very high temperature and becomes self-luminous, What causes the color shift
A child playing tee ball hits a stationary 65 g ball with a 200 g bat swinging initially at 4.0 m/s. What's the bat's post-impact speed
A saturated solution of strontium hydroxide is prepared in the excess solid Sr(OH)2 is allowed to settle. A 25.0mL aliquot of the saturated solution is withdrawn and transfer to an Erlenmeyer flask
Consider a generator with a 300 turn coil on its armature and a uniform magnetic field of 5.4 T. The diameter of the coil is 5.0 cm. how fast do we need to rotate the coil
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 128-kg laser sensor that measures the thickness of the ice, find the tension in the cable towing the sensor
What is the total charge of the plutonium nucleus? (The neutral plutonium atom has 94 electrons.), What is the magnitude of the force on an electron at a distance of 9.75 Angstrom from the plutonium nucleus
The average value of the squared speed does not equal the square of the average speed. Calculate the average value of the squared speed
A gas of diatomic molecules is in equilibrium at a temperature of 340 K. What is the mean angular momentum of the molecules
A person sees a heavy stone strike the concrete pavement. A, moment later two sounds are heard from the impact: How far away did the impact occur
The security alarm on a parked car goes off and produces a frequency of 1190 Hz. At what speed are you driving
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