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?
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.
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
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.