Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E=mc2?
A) A small amount of the hydrogen in of a nuclear bomb becomes energy as fusion converts the hydrogen to helium.
B) An object accelerated to a great speed has a lot of kinetic energy.
C) A mass raised to a great height has a lot of gravitational potential energy.
D) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
A
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Conversion of Units: Given that 1.00 in. = 2.54 cm, how many square centimeters are in 1.00 square inch?
A. 1.59 B. 2.54 C. 5.08 D. 6.45
Graphical Analysis: If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis, the object is
A. moving with constant non-zero speed. B. moving with constant non-zero acceleration. C. at rest. D. moving with increasing acceleration.
A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
Studying a spectrum from a star can tell us a lot. All of the following statements are true except one. Which statement is not true?
A) The total amount of light in the spectrum tells us the star's radius. B) The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelengths. C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. D) Shifts in the wavelengths of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us.