Heat is transferred from a substance if it is exposed to something that has a lower temperature
Indicate whether the statement is true or false
T
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Parallel Wires: Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in the same direction,
A. one wire is lifted slightly while the other wire is forced downward against the table's surface. B. both wires are lifted slightly. C. the wires pull toward each other. D. the wires push away from each other.
General Questions: A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is
A. 1500 N. B. 24,000 N. C. 6000 N. D. 12,000 N. E. We need to know if the car is accelerating to answer this question.
The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially have the same activity (number of decays per second)
What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples? A) There are more strontium-90 than cobalt-60 nuclei. B) There are equal numbers of cobalt-60 and strontium-90 nuclei. C) There are more cobalt-60 than strontium-90 nuclei. D) It is not possible to compare numbers of nuclei without knowing the masses of the samples.
What is the value of n in the Balmer series for which the wavelength is 410.2 nm
A) 4 B) 5 C) 6 D) 7 E) 9