Question

which two of the following statements are true about a person who has a mass of 130lb and who is standing on mars

A the person mass is the same as it was on earth

B the person weight would be more than it was on earth

C the person weight would be 49.4 lb

D the person weight would be 157.4lb

Answer 1

@Dude @valirium @thisgirlpretty @shadow

Answer 2

Mass is same no matter where you are

Answer 3

Mass just means 'what you are made up of.' So you will always consist of the same amount of atoms unless you use the bathroom or something.

Answer 4

Weight is mass times gravity, which is why you can weigh lighter on the Moon than on Earth.

Answer 5

3.711 m/s²

Apparently this is the gravity of Mars. This is less than Earth's gravity, which is 9.81 I m/ s² I believe. So that negates B because you would weigh less on Mars.

Answer 6

Do you know how to check for the last two?

Answer 7

9.81*

Answer 8

@Sazzie ?

Answer 9

Confused @Shadow

Answer 10

On what

Answer 11

On how to check the last two.

Answer 12

First off. "mass of 130lb" There is no such thing as mass being pounds. Is this what is says in your lesson?

Answer 13

Yes

Answer 14

We'll assume they meant weight. Do you see why?

Answer 15

Why it's 9.81? Or?

Answer 16

Pounds is what we use to measure our own weight, right?. Thus, pounds would involve gravity as we measure our mass times gravity. That is not mass -> 'mass is 130 pounds' lol

Answer 17

Ohhhh

Answer 18

So would it be A and B?

Answer 19

Why do you think it's B?

Answer 20

I meant C

Answer 21

Why do you think it's C?

Answer 22

Because of less gravity. Since space and the moon have 0 gravity

Answer 23

The moon has gravity. And if the gravity was zero, you wouldn't weigh anything.

Answer 24

\[130 \div 9.81 = 13.3\]
\[13.251783894 \times 3.711 = 49.2\]

Answer 25

Divide Earth's weight, 130, by 9.81 (Earth's gravity) to get the persons mass.

Then multiply that mass by Mar's gravity and you get 49.2, Mar's weight

Answer 26

They have 49.4 but close enough. Stuff is different based on how you round.

Answer 27

Ohhh so A and D?

Answer 28

Are you guessing

Answer 29

No I'm confused on how all this works. I haven't used this science stuff since 3rd grade.

Answer 30

You have to point to what confuses you

Answer 31

*Points to the math and trying to figure it out* I got lost quick. Don't blame me XD

Answer 32

So we want to find out the person's mass to use it to see what the person's weight is on Mars, as there are two possibilities.

C the person weight would be 49.4 lb

D the person weight would be 157.4lb

The formula for weight is mass times gravity. So we can find the mass of this person by dividing 130 (Earth weight) by 9.81 (Earth gravity) to get their mass.

Then we multiply that mass by Mar's gravity.

Answer 33

I got 13.2

Answer 34

Yeah it was 13.25 so I rounded to 13.3 for the first part. But I used 13.25... for the next calculation

Answer 35

Yay

Answer 36

Next you just multiply that mass, which is 13.25...kg by Mars' gravity.

Answer 37

Okay so 13.25 by 13.25?

Answer 38

13.25 is the person's mass.

Answer 39

Oh so 13.25 * 3.711? Which is 49.17075

Answer 40

ye

Answer 41

So it was A and C?

Answer 42

yes