Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3
a. 71
b. 52
c. 67
d. 191
e. 208
c
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A marshmallow in a vacuum becomes
A) larger. B) smaller. C) does not change.
When an object 1.15 cm tall is placed 12 cm from a lens, the lens produces an upright image of the object that is 5.75 cm tall. What is the focal length of the lens?
A) 24 cm B) 18 cm C) 60 cm D) 15 cm E) 9.0 cm
In the figure, a 5.00-kg block is moving at 5.00 m/s along a horizontal frictionless surface toward an ideal massless spring that is attached to a wall
After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when it has moved so that the spring is compressed to only one-half of the maximum distance? What will be an ideal response?
When discovered in the 1960's, a(n) ___________ was found to emit large amounts of energy, but through visual and radio telescopes appeared to be a single point of light much like a star
a. a planet like Venus b. E galaxy c. spiral galaxy d. double-lobed radio galaxy e. quasar