Question

A rocket moves through outer space at 11,000 m/s. At this rate how much time would be required to travel the distance from Earth to the moon which is 380,000km?

Answer 1

Convert m/s into kilometers per hour.
11 000 m/s = 39 600 km/h

Then divide the distance
380 000 km / 39 600 km/h = 9.5960 hours

Answer 2

So all I had to do was convert the 11,000. I see my mistake now. Thank you so much. I have 23 questions to do but I can't seem to figure them out.

Answer 3

You could have also converted the kilometers into meters, but that gives a giant number.

Answer 4

Yeah I was gonna do that but the 380,000 was too big.

Answer 5

Do you know anyone who can help me with my questions?

Answer 6

I can continue to help, probably

Answer 7

So should I post them on the comments bar? I did most of them that I could do but then I got stuck. If you or anyone could help that would be great.

Answer 8

Sure, I don't think it matters much where you post it.

Answer 9

Ok thank you. Well this one is kind of tricky, for me at least. How many meters away is a cliff if an echo is heard one-half second after you yell "Hello"? Assume that sound traveled at 343 m/s on that day.

Answer 10

Do i convert the 343 m/s?

Answer 11

Nah, you don't need to m/s is the standard generally.

Answer 12

Basically the equation you will use is:
\[\Delta d = v \Delta t\]

The "tricky" part about this question is that you have to divide the distance you get by half. This is because the sound wave made two trips because it went to the cliff and back to you.

Answer 13

So you should get 257.25 m.

Answer 14

so the 343 m/s is the time.

Answer 15

No the distance I mean.

Answer 16

No, the distance cannot be in meters per second.

Using the equation I gave you, velocity (v) would be 343 m/s and time (t) would be 1.5 s

Answer 17

Oh ok cause it said one-half second.

Answer 18

This subject is not my calling lol

Answer 19

It is simply putting numbers into an equation. :P

Although, this question did try to trick you.

Answer 20

I make a triangle of Distance, Time, and Speed. So to get one you need to calculate the other two.

Answer 21

Exactly. Just make sure the units are the same. If you have km/h, then time has to be in hours. If you have m/s time has to be in seconds, etc.

Answer 22

A car has an average speed of 80.0 km/hr for one hour, then average speed of 90.0 km/hr for two hours during the three-hour trip? (a) How far did the car travel during the trip? (b) what was the average speed for the trip?

Answer 23

Just multiply the speed by the time and add them for a.
For b just find the average velocity like you find any average: (v1 + v2)/2

Answer 24

Ok let me try.

Answer 25

80 x 60 = 4800 and 90 x 120 = 10800. 10800+4800= 15,600 km ?

Answer 26

Ah, not quite. Your speed is in km/hr. So in order to get rid of the "hr" denominator, you need to multiply it by "hr". So it should be 80 km * 1 hour + 90 km * 2 hours.

Answer 27

So did i get the number right?

Answer 28

Thank you for all your help!

Answer 29

No, your number is incorrect it should be: 260 km