Calculate the weight of 30 L of ethanol. Specific gravity is.810.Give answer in Pounds. How do I use specificgravity in equation togive me weight?
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Where does gravity act on the plank in the picture above. if thecenter of the plank (where it contacts the staircase) is our pivotpoint, how much torque does the weight of the plank have?
Must explain answer.
For the first partm, if you say L/2, then I assume you mean thatgravity it is as if gravity is pulling down at the point of contactbetween the plank and the staircase. if so, I assume you are alsogoing to say that the torque of gravity is zero for it has no leverarm. (This is wrong. So explain why.)
The period of an oscillating weight on a spring in an inertialframe of reference is 0.80s. What would be its speed if it were tomove by an observer who measures its period as 1.2 s? (c = 3.00 x10^8 m/s)I think I need to use t' = (gamma) (t) but and solve for gamma,then use gamma to find v/c, which then will give me velocity?