When aluminum foil is formed into a loose ball, it can float on water. But when the ball of foil is pounded flat with a hammer, the foil sinks. why?

How much energy in joules does it take to raise the temperature of 1.5kg of aluminum from 20 degrees Celsius to 40 degrees Celsius

Competitive pressures stemming from the threat of entry are stronger when

A package dropped from an airplane reaches a velocity of 117.72 m/s in how many seconds? (Show all work)

What is now considered to be the mechanism for the production of the double lobes of radio emission that appear on either side of many galaxies?

2. How does the electrical force relate to the charge of an object? a. It is inversely proportional to the square of the charge. b. It is directly proportional to the square of the charge. C. It is inversely proportional to the charge. d.

Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury. Name three uses for mercury.

Ten seconds after starting from rest, a car is moving at 40 m/s. what is the car's acceleration in meters per second per second?

A student builds a simple circuit and a magnet under one of the circuit wires. When the switch is closed charges flow int the circuit and the wire moves

Cite an example in which a force is exerted on an object without doing work on the object

Which equation best expresses the first law of thermodynamics, assuming Q is heat, U is internal energy, and W is work? A.ΔW = ΔQ + ΔU B.ΔW = ΔU - ΔQ C.ΔQ = ΔU+W D.ΔU=Q - W