1.) How will the rising of a hot air balloon in cold air be different then if it rises in warm air? a.)It will rise faster in cooler air

b.) It will rise more slowly in cooler air

c.) There will be no difference

d.) It will sink in cool air and rise in warm air

2.) The average kinetic energy of the molecules in a substance is correctly referred to as:
a.) heat
b.) density
c.) temperature
d.) solubility

3.) The average kinetic energy of the molecules in a substance refers to its:
a.) heat
b.) temperature
c.) momentum
d.) viscosity

a.)It will rise faster in cooler air

a.) heat

Explanation:

i

A hot air balloon rises faster if cold air were to surround it due to density differences between the air in the two medium.

ii. Heat

The average kinetic energy of the molecules in a substance is termed heat.

Heat is a form of thermal energy measured by the kinetic energy possessed by molecules in a substance.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.