The slope of a velocity vs. time graph is the acceleration
Indicate whether the statement is true or false
T
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Describe how we know that the expansion rate of the Universe is currently accelerating
What will be an ideal response?
An aluminum tube (E 5 72 GPa) AB of circular cross section has a pinned support at the base and is pin-connected at the top to a horizontal beam supporting a load Q 5 600 kN. The outside diameter of the tube is 200 mm and the desired factor of safety with respect to Euler buckling is 3.0. The required thickness t of the tube is most nearly:
(A) 8 mm
(B) 10 mm
(C) 12 mm
(D) 14 mm
Which of the following is an "exchange particle" for the electroweak force?
A) the photon B) the Z particle C) Both of the above. D) the W+ and W- E) All of the above.
You lift a 1 kg object [weight on Earth = 10 N] by 1 m. By about how much does the object's mass increase?
A) 10-12 kg B) 0.01 kg C) 10-16 kg D) 10-14 kg E) Its mass doesn't change at all.