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A 50 kg bag of sand at 25 C falls 10 m onto the pavement and comes to an abrupt Stop. Neglect any transfer of heat between the sand and the surroundings and assume that the thermal capacity of the sand is so large that its temperature is unchanged.
a) What is the dissapative work done on the sand?
b) What is the change in internal energy in the sand?
c) What is the entropy change associated with this change in U at a constant T.
A grindstone of radius 4 m is initially spinning with an angular speed of 8 rad/s. The angular speed is then increased to 10 rad/s over the next 4 seconds. Imagine that the angular acceleration is constant.
Two capacitors have the same plate separation, but one has square plates and the other has circular plates, at is the dielectric constant kcircular of the material between the circular plate
An elastic cord is 65 cm long while a weight of 56 N hangs from it and is 82 cm long while a weight of 84 N hangs from it. What is the spring constant of this elastic cord.
What is the magnitude of the normal force that each brake pad applies to the rim . find the length of the meterstick as measured in frame S1 according to classical physics. Reply in units of m.
Explain how many penguins of mass 27 kg each can stand on the ice block before they get their feet wet?
What is kinetic energy of the shell
For silver electrode (hint: click just below the word "cesium"), what is the highest energy of an electron ejected by light of 250 nm.
Neglecting air resistance, how fast is it going when it hits the balloon? Illustrate what is the acceleration of the cannonball just before it hits the balloon?
A wind is blowing straight from north to south at an unknown speed. When you hold up a piece of thread you can see that the wind stretches it out so that it points from your hand to the south. What is the speed of the wind relative to the ground
An experiment measures the temperature of a 270 substance while steadily supplying heat to it. The results of the experiment show. What are (a) specific heat of the liquid phase and (b) the heat of vaporization.
How long does this pendulum take for one oscillation? Presume that all displacement angles are small.
Water can hold 36 grams (g) of salt in every 100 milliliters (mL). The ocean contains 3.6 g of salt in every 100 mL. As a solution, which is seawater.
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