A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN, P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
(A) 0.9 mm
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If 40 kcal of heat is added to 2.0 kg of water, what is the resulting temperature change?
A) 80C° B) 60C° C) 40C° D) 20C° E) 0.05C°
We know that light is quantized because, in the double slit experiment with light,
A) when dim light is used, the light hits the screen at tiny separated impact points. B) when the experiment is done in strong light, no interference pattern shows up on the screen. C) an interference pattern shows up on the screen. D) when one slit is closed, the light hits the screen at tiny separated impact points. E) when one slit is closed, no interference pattern shows up on the screen.
The lakes on Titan have not been observed to have any waves. What does this suggest?
What will be an ideal response?
The photosphere is about 100 times the diameter of the Earth
Indicate whether the statement is true or false