An Atwood machine consists of an object of mass of 3.5 kg connected by a light string to an object of mass of 6.0 kg over a frictionless pulley with a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm
If the system is released from rest, what is the speed of the objects after they have moved through 1.25 m if the string does not slip on the pulley? A) 2.0 m/s
B) 2.3 m/s
C) 4.0 m/s
D) 5.0 m/s
E) 6.0 m/s
B
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Electronegativity increases ______________ across a period and ______________ in a group
a. right to left; bottom to top b. left to right; top to bottom c. right to left; top to bottom d. left to right; bottom to top
The root mean square speed of a gas molecule is greater than the average speed, because the former gives a greater weight to
A. lighter molecules. B. heavier molecules. C. lower speeds. D. higher speeds. E. more probable speeds.
Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John stays in the air
A) 0.50 times as long as Harry. B) the same time as Harry. C) twice as long as Harry. D) three times as long as Harry. E) four times as long as Harry.
What is the wavelength of a photon having the same momentum as an electron that is traveling at 7.5 km/s?
(h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)