Science questions help please!?

Question

1.A bungee cord is stretched to twice its length. What changes? Its mass? volume? density?

2. Two shoe boxes are identical in size. One contains beans and the other contains popcorn. What is the same and what is different? Mass? Volume? Density?

3. Besides shape, what is different between a 300 gram rectangular lock of copper and a 300 gram round ball of copper? Mass? Volume? Density? Explain your reasoning.

Thank you sooo much in advance!! :)

Answer 1

1. If we are to assume that you are always comparing to a set amount of bungee, then mass will not change (you are not taking away or adding to it), volume technically hasn't changed (the thickness decreases while length increases), and density (being mass per volume) I would assume would not change. All that has been changed is the shape. If volume stays constant, then density cannot change with a given mass.

2. There's not enough information here. When you ask what is the same, are you referring to the box or the contents? Mass: well, that depends on the weight and volume of the beans. Generally, beans will be heavier, so the mass of the bean box would be more. Volume: are we talking the volume of the box as a whole or the volume of space left in the box between the contents. Obviously, it would be hard to calculate volume with irregular shapes such as popcorn. I would expect the beans to leave less unoccupied volume, but again I don't know exactly what the question is asking. Density: Well, assuming the beans weigh more (as they usually do), the amount of mass per volume would be higher in the bean box, so that one would be heavier.

3. Mass: well, they have already told you that the mass is equal, so they are the same. Volume: Although they are different shapes, they would be the same volume (assuming equal conditions). The sphere is a more efficient shape (less surface area) than other shapes, but the volume is the same. Think of it this way, if you melt the 300 grams of copper you can shape it how you want, but you will always have the same amount. You've added nothing nor taken anything away, so you can't change the density of the metal just by the shape.

Hope this helps.

Answer 2

1.shape changes and density
2. volume is the same, mass and density are different.,
3. If they are both pure copper and have a mass of 300 g. ,then the density must be the same(physical property of copper) and therefore the volume must be the same. D=m/v

Answer 3

Hey, where not here to do your homework for you, but hopefully I can explain.

"Conservation of Mass" is one of the fundamental principles of science. Matter or mass cannot be created or destroyed but it can only move, or change its shape or form. If you have a rocket with 100 kg of fuel, what comes out the nozzle may not be rocket fuel any longer buy it all still weighs 100 kg.

volume is a property similar to length, but it is a measure of the absolute amount of space an object takes up. it depends on the size and shape of an object. One easy way to measure it is to dunk the object in a tank of water and see how much the water level changes.

Density is a measure of how much matter exists in any portion of an object no matter how small:
density = mass / volume
For example a bar of aluminium is relatively light but a bar of lead the same size is very heavy. Thus the lead has a much greater density. Hint: density depends on a number of things but mostly on the material of an object, If an object is the same material as another one, and they are under the same physical conditions, they must have the same density.

Answer 4

The mass is constant. The volume increases slightly, and the density thus decreases slightly.

Volume is the same, mass and density differ. (How?)

Mass, volume, and density will all be the same. The density of copper does not depeond on its volume or mass, and it is given that the masses are identical. Hence the volumes will be identical also.

Answer 5

1. mass 2. Volume 3.?

Answer 6

make a great volcano. then positioned lego figures. make a concotion of vinegar and baking soda. then CA-enhance! lol or seek approximately tsunamis. did u comprehend that tsunamis in the north and south poles freeze while they hit the air? it rather is because of the fact the currents in the water are slightly above freezing, and the air is a few distance under freezing. merely study the sea. or do icicle carbon courting. its fairly cool. its like they take a center pattern from the icicle, and it tell scientists how the earth replaced into hundreds (even tens of millions) of years in the past.

Answer 7

what