Question

Help checking my science homework?

Answer 1

1. Which of the following is a reason why a person might want to wear snowshoes if walking a distance in deep snow? (1 point)
snowshoes spread the person’s weight out
snowshoes reduce the amount of pressure on a given spot
snowshoes keep the person from sinking in the snow
all of these ***
2. The measure of the average kinetic energy of the particles of a substance is the ____. (1 point)
temperature
heat
thermal energy
kinetic energy***
3. Archemedes’ Principle helps to explain the relationship between ____. (1 point)
kinetic energy and density
temperature and density
pressure and density***
buoyancy and density
4. Which of the following is equal to the buoyant force of a rock placed in a beaker of water? (1 point)
volume of the displaced fluid***
weight of the displaced fluid
volume of the rock
weight of the rock
5. Dry ice is an example of _________, which is the process of a solid turning directly into a gas. (1 point)
precipitation
melting
condensation
sublimation***
6. The ____ is a unit of force. (1 point)
pascal
atmosphere***
newton
kilopascal
7. Which of the following is the boiling point of water? (1 point)
-40°C
0 °C
100°C***
130°C

8. Which of the following describes the molecular structure of water at 40°C? (1 point)
water molecules are packed closely together and move only a little
water molecules are spread out and moving vigerously
water molecules are close together and moving freely around each other***
none of these

Answer 2

the stars are what I think the answer is

Answer 3

In general, they look pretty good. Numbers 2, 3 and 4 could use some attention. Is that enough of a pointer, or would you like to work through them?

Answer 4

And 6 also needs some more work.

Answer 5

can you go through them?

Answer 6

Starting with number 2, it asks you for a *measure* of average kinetic energy of the particles, not the kinetic energy itself...

Answer 7

umm thermal energy?

Answer 8

Total thermal energy is incredibly difficult to measure. You are looking for something which is very easy to measure.

Answer 9

temperature!

Answer 10

Yes, I agree.

Moving on to Archemedes Principle, it does not have to do with total volume displaced. A very dense item of small volume sinks as readily as a bigger item with greater volume. So you are looking for a measure of how well something floats or not.

Answer 11

bouyoncy and density?

Answer 12

Yes, I agree with that one too. :D

Answer 13

yay!

Answer 14

And number 4 is similar. A big item with low density displaces a lot more volume than a small, very dense object. So rather than relate buoyancy to the volume of displaced fluid, you should relate it to the.....?

Answer 15

weight of the displaced fluid?

Answer 16

It is indeed weight of the displaced fluid. :D

Answer 17

And for number 6, they are all units. The one you selected is the unit for pressure, when it asks you for the unit of force...

Answer 18

newton?

Answer 19

Yup, it is the Newton. Do you have any questions about that (or any of the other probs) or is it all clear to you?

Answer 20

Nope! You explained them really good! Thank you so much! I have one more question but I will put that one seperately

Answer 21

Thanks :D And thank you for working through the probs instead of just asking for answers.