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Magnets
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Terms in this set (8)
Magnet
exerts magnetic forces
Attract
is what happens when two opposite charges pull near each other
Repel
is what happens when two like charges push away from each other
Pole
the magnetic force within each magnetic, either north or south
Hypothesis
an educated guess that can be tested
Prediction
a statement made about the future
Compass
magnet that is free to move
Magnetism
the ability to attract things
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Verified questions
PHYSICS
To estimate the number of ants in a nest, 100 ants are removed and fed sugar made from radioactive carbon of a long half-life. The ants are returned to the nest. Several days later, of 200 ants taken from the nest, only 5 are radioactive. Roughly how many ants are in the nest? Explain your calculation technique.
PHYSICS
(a) Estimate the fuel efficiency, in miles per gallon, of a typical car. (b) The combustion of a gallon of gasoline releases 120 MJ of energy. If a typical car is driven at 40 mph and the engine is turning at 3000 revolutions per minute, then based on your estimate of fuel efficiency, how many joules of energy are released by combustion during each cycle of the engine? (c) A typical car engine runs with 20% efficiency. Based on this figure, how many watts of power does the car supply when moving at a steady 40 mph? (d) What is that figure in horsepower?
PHYSICS
The engines of most rockets produce a constant thrust (forward force). However , when a rocket is fired, its acceleration increases with time as the engine continues to operate . Is this situation a violation of Newton's second law? Explain.
PHYSICS
At $22 \mathrm{m} / \mathrm{s}$ magnitude of the resistive force that air exerts on the car is about $200 \mathrm{N}$. Which answer below is closest to the magnitude of the drag force when the car is traveling at $31 \mathrm{m} / \mathrm{s} ?$ (a)$100 \mathrm{N}$ (b)$140 \mathrm{N}$ (c)$280 \mathrm{N}$ (d)$400 \mathrm{N}$ (e)$520 \mathrm{N}$
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