Halley's Comet returns about every ______________ years
a. 4
b. 12
c. 1000
d. 10,000
e. 76
e
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A car starts from rest and accelerates uniformly at 3.0 m/s2 toward the north. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2 toward the north
How long after the second car starts does it overtake the first car? A) 12 s B) 19 s C) 21 s D) 24 s
A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point. Assume no air. What was the angle of launch if g = 9.80 m/s2?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
Our sister planet does not show plate tectonics on its surface to the degree our Earth does. What are possible explanations?
What will be an ideal response?
How can Betelgeuse be only half the Sun's surface temperature, yet about 10,000 times more luminous than the hotter Sun?
What will be an ideal response?