heat! so hard.
true or false
1.The entropy of a system can never decrease
2.All Carnot engines are reversible
3.It is impossible have a net transfer of heat from a cold reservoir to a warm reservoir
4.A refrigerator lowers the entropy of the volume inside
5.If the temperature...
F=mg=25x9.8
for question 1.) f=Fu ---> 165=25x9.8xu find u , u is the coefficient of static friction between the chair and the floor.
try to do 2 by yourself
Homework Statement
On January 15, 1919, a cylindrical tank of molasses ruptured, and poured out over the streets of Boston in a 9 m deep stream. Pedestrians and horses were killed, and buildings were knocked down.
Suppose the tank was 87.7 m high and 3.37 m diameter, and it was full of...
my professor gave us this problem on the homework assignment about Fluid.
Planet X is a sphere made entirely of the mythical metal exoferrum, which has density 2810 kg/m3. What is the period of orbit for a satellite in circular orbit just above the surface of Planet X? (That's right: I did...
Three point masses lie along a rigid, massless rod of length L = 5.61 m :
- Two particles, both of mass m = 2.1 kg, lie on opposite ends of the rod.
- Mass M = 7.29 kg is in the center of the rod.
Assume the rod lies along the x-axis, and rotates about the y-axis. about a point 1.28 m...
When empty, a 166 kg rowboat is symmetrical. A boy of mass 70.5 kg sits 2.1 m from the center of mass of the rowboat toward the front of the boat, and a girl of mass 68.8 kg sits 2.38 m from the center of mass of the rowboat toward the rear of the boat. Find x, distance from center mass of the...
A hockey puck of mass m sits on a frictionless, horizontal table tied to a string of length L. The puck starts at rest, and accelerates to some speed v moving in a horizontal circle of radius L. The net work done on the hockey puck,depend on what? L,m,or r??
i forgot the formula for the...
The magnitude of a certain one-dimensional force varies according to:
F = 6.68x^2 + 1.56
where x is the displacement from the origin in meters, and F is the force in Newtons. At t = 0, a 677 g mass is at the origin moving in the positive x-direction at speed 8.46 m/s when this force begins...