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As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.05 ×103 m3 to 1.15 ×103 m3. How much work does the helium do on its environment (assuming the gas bag remains slack)? If the initial temperature of the helium is 270K, how many joules of solar energy are absorbed?
A 3.00-g copper penny at 25.0 C drops 50.0 m to the ground. (a) If 60 percent of the initial potential energy of the coin earth system goes increasing internal energy of the coin determine the coin's final temperature (b) does the result depends on m..
A 10 N book is placed on a table. a) What is the mass of the book? b) If 20 N of force is needed to keep the book moving at constant velocity, what is the books acceleration
An infinite plane of surface charge density +.2uC/m^2 is in the y-z plane at x=0, What is the magnitude of the electric field close to the surface
A 2.83-kg book slides 1.17 m along a level surface. The coefficient of kinetic friction between book and surface is0.41. Find the work done by friction
The 1800-turn coil in a dc motor has an area per turn of 1.1 multiply.gif 10-2 m2. compute the current in the coil
If a 120g mass was placed at the 25cm mark, and a 20 g mass at the 12 cm mark, where must a 500 g mass be placed to balance the system?
The block of mass M slides back along the horizontal surface with a coefficient of kinetic friction ?k and eventually comes to a rest. calculate the total trip time from bullet impact to now
A Carnot engine operating between a warmer unknown temperature and a reservoir of boiling helium at 1.76 K has an efficiency of 75%. What is the warmer temperature
What is closing equilibrium temperature of the tin-water
What are changes in the object's momentum and velocity. How much work is done if the similar tension is directed parallel to the snow.
An ideal gas is compressed at constant pressure to one-half its initial volume. a)If the pressure of the gas is 150kPa , and 770J of work is done on it, find the initial volume of the gas.
A bird stands on a dc electric transmission line carrying 2800 A. find the potential difference between the bird's feet
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