Why was the presence of a steam void so dangerous in the Three Mile Island accident? What could have happened?
What will be an ideal response?
The water surrounding the reactor was less than what was needed to carry away
the thermal energy safely in liquid form; therefore, the water boiled to steam, and the steam
was not able to carry thermal energy away as efficiently as the water it replaced. In the
presence of so much thermal energy, steam could dissociate into hydrogen and oxygen, ripe
for exploding were a spark to ignite the hydrogen.
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A 4 500-N weight is suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, T1 . Cable 2 applies a force upward and to the left at an angle of 37.0° to the negative x-axis and has a tension, T2 Find T2
a. 6.0E+3 N b. 2.7E+3 N c. 7.5E+3 N d. 5.6E+3 N e. 3.6E+3 N
The meter is defined in terms of the speed of ______________
Fill in the blank(s) with correct word
The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.
Energy Conservation With Conservative Forces: Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there is no air resistance, the maximum height of Joe's ball will be
A. four times that of Bill's ball. B. two times that of Bill's ball. C. equal to that of Bill's ball. D. eight times that of Bill's ball. E. roughly 1.4 times that of Bill's ball.