Answer:
Explanation:
Velocity vs speed and distance vs displacement is a pretty important. Distance and speed have no direction while displacement and velocity have a direction.
In other words, taking the first example, going 5m one way and then 14 the other would make the total distance 19m, while displacement would be -9m from where you started.
Anyway, velocity is displacement divided by time. For the first one I already got that the displacement is -9m, and the time is 11 minutes. It's worth noting that the answers are all in m/s, so we should convert the minutes to seconds. To do that multiply 11 minutes by (60 seconds/1 minute) so the minutes cancel out. so 11*60 is 660 seconds. Now, to find velocity we just divide. -9m/660s = -.0136 Which... doesn't seem to be one of the options...
For the second part it gives two point of views. If you were standing on the carrier, the spy would look like it was moving 4 m/s away from you, but the carrier itself is moving 12 m/s in the positive direction to an onlooker. If it's hard to figure out try thinking what it would look like if the spy was just standing still. it would look like they were moving -12 m/s if you were standing on the carrier. Then if the spy was moving at say 1 m/s it would look like they were moving -11 m/s if you were standing on the carrier.
Just keep that line of reasoning , where if it looks like the spy is moving -4 m/s from the carrier then the spy is moving 4 m/s slower than the carrier, so the spy is moving at 8 m/s
Pretty sure I got the first part right, so maybe a misprint from the question?
Answer:
table, book, water bottle, bed, vase, statue, etc.
Answer:
Explanation:
2.Big bang, 3.contraction of the solar nebula, 5.stellar ignition in our sun, 4.outgassing of earths secondary atmosphere, 1.appearance of the first ocean on earth ,7.evolution of photosynthesis, 6.build- up of oxygen in earths atmosphere.
Answer: a. 667N
b. 665N
c. 54.5N
Explanation:
a) on the surface of the earth
W = mg
W = 68 × 9.81
= 667N
b) at the top of Everest (8848 m above sea level).
W =mg × R²/(R + H)²
W = 667 × [6378²/(6378 + 8.848)²
W = 665N
c) has 2 1/2 times the radius of the earth
W = mg × R²/(R + H)²
W = 667 × R²/(R + 2.5R)²
W = 54.5N
