Wind is realted to the movement of warm and cold air masses. which kind transfer does this represent?
a.) convection
b.) conduction
c.) radiation
d.) absorbption

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.