The first stages of SpaceX rockets are reusable. They are first returned to a "landing zone" near their launch site, or returned to a moving platform at sea. Returning the first stage at sea actually saves fuel, because by the first stage separates from the rest of the rocket while they are above the sea!
Here is the link to today's notes:
https://docs.google.com/document/d/14JGjXVBQhcR9ZSZ8h1WjHUFFBFYQz3rI9pD96Sf3WKg/edit?usp=sharing
Here are the Plicker questions of the day:
How much more energy do you have relative to yourself on the first floor? Assuming you are 50 kg in mass and the height difference is 3.0 meters.
A.1470 J
B.490 J
C.150 J
D.29 J
Grouse mountain is 1127 meters above sea level, and the Grouse grind's base is 274 meters above sea level. How much energy do you (50kg) gain in potential energy by hiking the Grouse Grind?
A.4.3*10^4 J
B.5.6*10^4 J
C.4.2*10^5 J
D.5.5*10^5 J
Mark Watney, the protagonist in the movie the Martian, was threw into the air by a broken antenna on Mars. Mars has a smaller gravity (3.7 m/s^2) than the Earth. If his total mass, including his suit, is 100 kg, and he was threw 20 meters into the air, how much potential energy did he gain?
A.2000 J
B.3700 J
C.7400 J
D.19600 J
It took you 1 hour to hike up Grouse Mountain. Supposed that you have gained 420000 J of potential energy during this time. What is your average power during the hike?
A.117 W
B.7000 W
C.8400 W
D.420000 W
See you on Wednesday!
Mr. T
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