Radiation — Unit test Answers
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A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball? (Formula: )
A
0.1 kgB
0.2 kgC
0.4 kgD
0.5 kg22
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Which is required for convection to occur?
A
a solid substanceB
a heat sourceC
boiling waterD
air molecules23
Yami pours powdered cocoa mix into milk and stirs it. Then she microwaves the mixture for three minutes. When she takes the cup out, the handle is very warm. Steam rises from the cup, so she blows it before taking a sip. In which part of this scenario can convection be best observed?
A
stirring powdered cocoa mix into milkB
touching the warm handle of the cupC
rising steam from the cup of cocoaD
pouring the cocoa mix into the milk24
When Xavier places his hands near a light bulb, he notices that certain areas around the light bulb are warmer than others. Which best explains this?
A
The areas to the sides of the light bulb are warmest because of conduction.B
The areas to the sides of the light bulb are warmest because of convection.C
The area directly above the light bulb is warmest because of conduction.D
The area directly above the light bulb is warmest because of convection.25
What occurs when someone places an ice pack on an injured ankle?
A
Conduction causes the ice pack to lose thermal energy.B
Conduction causes the ankle to gain thermal energy.C
Cold from the ice pack is transferred to the ankle.D
Heat from the ankle is transferred to the ice pack.Did you find these answers helpful?
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