A marble moving 1.48 m/s rolls off the top edge of a 125-cm high table in a room where there is no appreciable air resistance and the free-fall acceleration is 9.80 m/s2. Neglect effects of air
(a) How far from the base of the table will it strike the floor? (b) How long will it be in the air?
(a) 75.0 cm (b) 0.505 s
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What affects long-term climate change?
a. changes in the Sun’s brightness b. changes in Earth’s reflectivity c. change in the tilt of Earth’s axis d. changes in greenhouse gas abundance e. all of the above
A star whose mass is 5 times larger than the Sun's and whose luminosity is 100 times larger than the Sun's has a main sequence lifetime about
A. 5 times longer than the Sun's. B. 5 times shorter than the Sun's. C. 20 times shorter than the Sun's. D. 100 times shorter than the Sun's. E. 500 times longer than the Sun's.
John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object's mass is proportional to its density and to its volume. Which one, if either, is correct?
a. They are both wrong. b. John is correct, but Linda is wrong. c. John is wrong, but Linda is correct. d. They are both correct. e. They are free to redefine density as they wish.
A screening curve exhibiting utility prices is only useful as long as the fuel price assumptions going into the curve are reflective of actual cost
What will be an ideal response?