You are able to purchase goods with paper money because it acts as a

A. unit of account.

B. store of value.

C. certificate of debt

D. medium of exchange

What effects can occur when heat energy is added to a system? Select all that apply. increase in temperature decrease in temperature change of state phase change

Katie traveled southwest a distance of 4000m on a bicycle in 5400s. What is her velocity? (speed = distance / time) .074m/s 1.35m/s SW 1.11m/s SW .74 m/s SW

Find the freqency of a wave with a period of 0.5 seconds

Identify the atom below. He, O, Ne, or Na

The table lists the value for two parameters, x and y, of an expirement. What is the estimated value of x for y = 0.049

A firefighter mounts the nozzle of his fire hose a distance 36.9 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. After quenching a hotspot at a height of 8.

A force is applied to a 13.0 kg wagon to pull it down the sidewalk at a constant speed. The coefficient of kinetic friction is 0.65. Considering the resulting frictional force, what is the magnitude of the applied force?

What field (s) does a moving electron have? A. electric and gravitational fields B. magnetic and gravitational fields C. gravitational, electric, and magnetic fields D. electric field only

Copper has a specific heat of 0.385 j. A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 Celsius to 200 degrees Celsius. What is the mass of the piece of copper?

I need to learn some interesting facts, any smart people out here?