Explain why adding oil to the moving parts of a machine can increase its efficiency

Which of the following is not an example of osmosis? Multiple Choice Salting meat serves as a preservative. Vegetables placed in fresh water firm up. Sugar in coffee dissolves. Strawberries placed in sugar become syrupy.

The compressor in a certain Carnot refrigerator performs 580 J of work to remove 150 J of heat from the interior of the refrigerator. How much heat must the coils behind the refrigerator discharge into the kitchen?

The position of an object as a function of time is given by [x (t) = at^3 - bt^2 + ct - d] where (a = 3.6, b = 4.0, c = 60 m, and d = 7.0). (a) Find the instantaneous acceleration at t = 2.4 s. (b) Find the average acceleration over the first 2.4

When are beats generated in two interfering waves?

At what speed would a car have to move in order to travel 20 kilometers in two hours?

Which of the pollutants shown in Figure 4-2 are considered to contribute to the pollution problem known as acid precipitation?

A billiards ball B rests on a horizontal surface and is struck by another billiards ball A of the same mass m = 0.2 kg. Ball A is initially moving at 18 m/s and is deflected 28° from its original direction. Assume the collision is elastic.

A model rocket is fired vertically from the ground with a constant acceleration of 45.3 m/s2 for 1.46 s at which time its fuel is exhausted. What is the maximum height (in m) reached by the rocket?

A crude approximation for the x component of velocity in an incompressible laminar boundary layer is a linear variation from u = 0 at the surface (y = 0) to the freestream velocity, U, at the boundary-layer edge (y = δ).

Why did dad leave mom?