Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships
An observer on Earth is able to measure the speed of only one of the ships as 0.9000c. From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?
0.794c
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A 1.1kg seagull takes off from a piling along the California coast and accelerates within 0.50s to a flight speed of 7.5m/s along a horizontal path. What average power was developed by the bird’s wings as it accelerated?
A. 62W B. 8.3W C. 33W D. 250W
The most accurate Greek attempt to explain planetary motion was the model of:
A) Aristotle. B) Pythagoras. C) Hipparchus. D) Ptolemy. E) Erastothenes.
Which statement best describes the solar neutrino problem?
A) Theoretical models predict that neutrinos should be produced in the Sun, but no neutrinos have ever been observed to be coming from the Sun. B) Solar neutrinos were detected but in fewer numbers than predicted by theoretical models. C) No one understands how it can be possible for neutrinos to be produced in the Sun. D) Our current understanding of fusion in the Sun suggests that all neutrinos should be destroyed before they arrive at Earth, yet neutrinos are being detected. E) The term solar neutrino problem refers to the fact that neutrinos are extremely difficult to detect.
At the ultimate tensile strength, the slope of the engineering stress-strain diagram is equal to _____________.
Fill in the blank(s) with the appropriate word(s).