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AP Physics 1: 1.1 Changes and Conservation Laws. What is the speed of the other piece of wood?
AP Physics 1: 1.3 Changes and Conservation Laws. How fast is the particle falling at the instant before it hits the ground?
If you bang your head against a moving wall while studying physics, and your head sticks to the wall and keeps moving, what is the combined velocit...
AP Physics 1: 1.1 Fields in Space 195 Views
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Description:
We've heard of some crazy dieting fads, but leaving the planet may take the cake. We don't suggest you do that, but we do suggest you answer this shmoopy AP Physics question!
Transcript
- 00:00
Thank you We sneak and here's your shmoop du jour
- 00:05
Brought to you by planet z knock We know what
- 00:08
you're thinking there's No planet z noche But maybe that's
- 00:11
just what they want us to think All right the
- 00:13
gravity on planet zi knock is half a strong as
Full Transcript
- 00:16
earth's gravity If a student weighs a hundred pounds on
- 00:19
earth how much would he weigh on planet zi knock
- 00:22
and here the potential answers right there Okay well if
- 00:27
we just went ahead and guessed b since that's half
- 00:30
of one hundred fifty pounds Well a good job that's
- 00:33
Correct But while we appreciate a good guesser let's take
- 00:36
a look at the mass so we can understand why
- 00:38
b is the right answer Well wait is the measure
- 00:41
of gravity's force on the mass of an object The
- 00:44
equation that expresses this relationship is wait equals mass times
- 00:50
gravity right there Weapons of mass gravity Okay well on
- 00:54
earth gravity equals nine point eight meters per second squared
- 00:58
let's Change meters toe feed and work with thirty two
- 01:01
feet per second squared And since we already know the
- 01:05
students wait one hundred fifteen pounds we can figure out
- 01:08
his mass with a little algebra if hundred fifty pounds
- 01:11
e equals m multiplied by thirty two then we couldn't
- 01:13
solve the equation by dividing both sides by thirty two
- 01:15
which would give us a mass of four point six
- 01:17
nine Now on xena the gravity is half a strong
- 01:21
so that means g now equals sixteen feet per second
- 01:25
squared In this case we multiply sixteen feet per second
- 01:28
squared by four point six nine slugs and we'd get
- 01:31
seventy five pounds So next time we need to drop
- 01:34
a few pounds without diet or exercise We'll just hop
- 01:36
on a spaceship take a left past neptune and in
- 01:38
a few hundred light years we'll get to z knock
- 01:41
And we just need to remember to bring a gift
- 01:42
for the sinak ian's They're pretty cool but we'll really 00:01:45.802 --> [endTime] kind of needy
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