Uncertainty Principle Using Momentum and Position: Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 10,000 (that is, within 0.01%). What is the minimum uncertainty in the position of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
1.2 mm
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Iron is passivated by the addition of _________in stainless steel.
Fill in the blank(s) with the appropriate word(s).
From a theoretical standpoint, what is a pulsar?
A) a star that alternately expands and contracts in size B) a rapidly rotating neutron star C) a neutron star or black hole that happens to be in a binary system D) a binary system that happens to be aligned so that one star periodically eclipses the other E) a star that is burning iron in its core
A spaceship, moving away from the Earth at a speed of 0.9c, shines a green laser backwards at Earth. An observer on Earth would see the light arriving at a speed of
A. c but at a smaller frequency. B. more than c but less than 1.9c. C. 1.9c and with a shorter wavelength. D. c but at a shorter wavelength. E. 0.1c and with an inverted frequency.
A cereal box has the dimensions of 0.14 m × 0.22 m × 0.070 m. If there are 3.28 feet per meter, then what is the volume of the box in cubic feet?
a. 7.6E–2 cubic feet b. 2.3E–2 cubic feet c. 2.7E–1 cubic feet d. 3.9E–3 cubic feet e. 1.3E–2 cubic feet