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A horseshoe (mass= 0.50 kg), which has just been forged, is dropped into 2.7L of water in a 0.45kg iron pot initially at 22 C. If the final equilibrium temperature is 27 C, estimate the initial temperature of the hot horseshoe.
A 25 kg child sits in a swing supported by two chains, each 2.7 m long. If the tension in each chain at the lowest point is 147 N, Find the force of the seat on the child at the lowest point
A 250g steel ball and a 500g steel ball each hang from 3.0-m-long strings. At rest, the balls hang side by side, barely touching. To What angle does each ball rebound
A 8000-kg car is traveling at 1.7 m/s along a horizontal road when the brakes are applied. How much kinetic energy does the car lose
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 14.0 m/s. With what speed and angle does the stone land
Two polarizers are oriented at 54? to one another. Unpolarized light falls on them. What fraction of the light is intensity is transmitted
An early model of the atom, proposed by Rutherford after his discovery of the atomic nucleus, had a positive point charge, What is the electric field at the surface of the atom
A box of mass 5.4 kg is accelerated from rest by a force across a floor at a rate of 2.0 m/s2 for 9.0 s. Find the net work done on the box
A person pulls a toboggan for a distance of 34.8 m along the snow with a rope directed 32.2 degrees; above the snow. The tension in the rope is 91.5 N. How much work is done on the toboggan
Radioactive isotopes are often introduced into the body through the bloodstream. If the decay rate in the thyroid 24.0 d later is actually measured to be 17.0Bq , what percent of the tracer went to that gland
Consider a small raindrop and a large raindrop falling through the atmosphere. What are their accelerations when they reach terminal speed
A magnesium surface has a work function of 3.68 eV. Calculate the maximum kinetic energy of the ejected electrons
A sprinter accelerates from rest to a top speed with an acceleration whose magnitude is 3.53 m/s2. how far does he run during the acceleration phase
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