What would be the de Broglie wavelength for 1-g object moving at the earth's escape speed 25,000 mph (about 11 km/s)? (h = 6.626 × 10-34 J ? s)
What will be an ideal response?
6 × 10-35 m
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What is a black hole?
A. a binary star B. a product of our imagination C. massive collapsed stars with strong gravitational fields D. massive collapsed stars with strong electromagnetic fields
When ice melts, its temperature __________
Fill in the blank(s) with correct word
Which of the following diagrams shows the greatest magnitude net torque with a zero net force? All the rods, of length 2r, rotate about an axis that is perpendicular to the rod and fixed in the center of the rod. All the forces are of magnitude F or 2F and all distances from the axis are r or r/2
a.
b.
A 60.0-kg person rides in elevator while standing on a scale. The elevator is traveling downward but slowing down at a rate of 2.00 m/s2. The reading on the scale is closest to
A) 708 N. B) 469 N. C) 589 N. D) 120 N. E) 349 N.