The most accurate way to determine the surface temperature of a star is to study the pattern of emission lines from various atoms
a. True
b. False
Indicate whether the statement is true or false
False
You might also like to view...
Imagine you serve a tennis ball with an initial speed of 10 m/s in a direction 10° below the horizontal. What is its speed at the peak of its trajectory?
A. 10 m/s B. 9.8 m/s C. 1.7 m/s D. 0 m/s E. There is no “peak” to this tennis ball’s trajectory. F. Other (specify)
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
A. The gravitational potential energy of the system is greatest at A and B. B. The kinetic energy of mass m is greatest at point O. C. The greatest rate of change of momentum occurs at A and B. D. All of the above are correct. E. Only (a) and (b) above are correct.
Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones
a. True b. False Indicate whether the statement is true or false
A 400-W computer (including its monitor) is turned on for 8.0 hours per day. If electric energy costs 10¢ per kWh, how much does it cost to run the computer annually for a 365-day year?
A) $120 B) $1200 C) $15 D) $150