Which of the following can supply the energy for modern home heating systems?

electricity

biomass

solar

geothermal

If the actual mechanical advantage of a machine is 4.2, and the input force is 10.0 N, what is the output force? 2.3 N 42 N 0.42 N 10 N

Why does paper feel different after it has been wet and dried?

Which one of the following statements about proprioceptive neuromuscular facilitation (PNF) is most accurate? It involves a very small amount of resistance. It involves bouncing, repetitive movements.

Scientists and engineers are working to develop ways to replace corn with a different plant, such as switchgrass, in the production of ethanol. This is largely because using corn to produce ethanol could cause a problem for society.

Select the example that best describes a renewable resource. A. Coal is a source of fuel that is used to power large ships and trains. B. In some areas, heat from deep in the Earth can be used to heat water and homes. C.

R was thirsty and decided to mix up a pitcher of lemonade. She put lemon juice, water, and sugar into a pitcher and stirred it to create this wonderful new drink. How could Taylor decide if she just created a mixture or a compound?

Because the __ signal changes smoothly, like a sine wave, it can closely mimic a human voice. However, part of the signal can easily get lost to __.

What four things does the resistance of a wire depend on?

What is the smallest particle representing hydrogen peroxide? a) a hydrogen atom b) a molecule c) an oxygen atom d) diatomic oxygen

The sun radiates energy. Does the earth similarly radiate energy? If so, why can't we see the radiant energy from the earth? 1.