The efficiency of a machine is always less than 100% because

Explain why your hair sticks to a plastic (polyethylene) comb.

What's the mass of methanol?

When energy is transferred to ocean water from the moving air above it, what happens to most of the energy. A. It pushes the water foward B. It cause the water to evaporate C. it moves through the water D. It reflects of the surface of the water

How many electrons would a neutral atom of nitrogen need to gain in order to have a full valence electron shell? A. 3 B. 5 C. 7 D. More information is needed to figure this out.

van der Waals bonding can be important to the modulus of which of the following? Select one: a. metals only b. some polymers c. ceramics only d. hydrogen bonded materials e. metals and polymers

How would a solution that is labeled 5.0 molar be similar to one labeled 5.0 molal?

Calculate the percentage by mass of nitrogen in ptcl2 (nh3) 2.

Below are the structures of three fatty acids, palmitic acid, stearic acid, and oleic acid. what combination of these fatty acids could you use to make a fat that is liquid at room temperature?

According to the quantum-mechanical model of the atom established by shrödinger, where may the electrons of an atom be found?

Renewable resources cannot be replaced in our lifetime