A particle starts from the origin at t = 0 with a velocity of 
m/s and moves in the xy plane with a constant acceleration of 
m/s2. What is the speed of the particle at t = 2.0 s?
A. 52 m/s
B. 39 m/s
C. 46 m/s
D. 33 m/s
E. 43 m/s
Answer: D
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You drop a freely falling body at the equator and at the north pole. The acceleration of the freely falling body at the equator is _______________ the acceleration of the freely falling body at the north pole
Fill in the blank(s) with correct word
How do we know that the Universe's expansion is speeding up?
A.) We've measured it for a long time and seen that galaxies are moving faster with time. B.) We look at objects from different times in the past to see how expansion changes with time. C.) We can see the change in the expansion rate from year to year. D.) We can see the change in the expansion rate from month to month. E.) We can see the change in the expansion rate from week to week.
Triple pane window glass has been used in some building construction. Triple pane glass is a set of three glass panels, each separated by a sealed air gap. Estimate the R-Value for triple pane windows and compare this to the R-Value for single pane glass.
What will be an ideal response?
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole.
B) They always remain above your horizon.
C) They make relatively small circles, traveling clockwise around the north celestial pole.
D) Like all other stars, they rise in the east and set in the west.
E) You cannot see them from the Southern Hemisphere.