Which force field can both accelerate an electron and change its speed?
A) electric field.
B) magnetic field.
C) both of these
D) none of the above
Answer: A
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Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years
By measuring the amount of its decay product (argon-40 ) present in the rock, you conclude that there must have been 80 micrograms of potassium-40 when the rock solidified. How old is the rock? A) 3.75 billion years B) 2.5 billion years C) 5.0 billion years D) 1.25 billion years
Two long parallel wires carry currents of 10 A in opposite directions. They are separated by 40 cm
What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A) A) 3.3 µT B) 1.5 µT C) 6.7 µT D) 33 µT E) 67 µT
Climate models support the claim that human activity is causing the currently observed global warming because
A) the models can perfectly predict all aspects of today's climate. B) climate models that include contributions by human activity agree much better with actual data than models that consider only natural factors. C) the models are very sophisticated, with thousands of equations, and this gives scientists confidence that the models must be correct. D) the models predict that warming will continue in the future.
An important condition for the operation of the Falkirk Wheel is that
A) water in each caisson have the same depth. B) ships carried are more or less equal in weight. C) no water spill when a ship enters a caisson. D) all of the above E) none of the above