dens = mass/volume. after crushing, vol less so density more. the actual density of the metal is the same, density of can changes
The density of a metal can, whether it is crushed or not, remains the same because density is an intrinsic property of matter, dependent only on the mass and volume of the substance. Changing the can's shape alters its volume but does not affect its mass or its density.
The density of a substance is the ratio of its mass to its volume (Density = Mass / Volume). This physical property is intrinsic to the substance, meaning it doesn't change regardless of the quantity or form the material is in.
When you crush a metal can, you're changing its shape and thereby altering its volume. However, the mass remains the same because you haven't removed or added any material. As a result, the density of the metal in the crushed can stays the same as the metal's density before the can was crushed.
Let's consider a practical example: a block of brass and a piece of rebar. Both have the same mass and are made of the same metal, but the block of brass has a larger volume. Nevertheless, the densities of these substances remain constant. That's because density is an intrinsic property, reflecting the compactness of material in a substance. Hence, even though you change the can's shape (thus, its volume), you have no impact on the metal's density.
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(b) What are their speeds at that time?
(c) At what time(s), if any, do the cars pass each other? ...?
B. energy
C. charge
D. the speed of light
Correct answer is D.
The famous mass-energy equivalence equation is given by Einstein. It states that mass is concentrated energy. The equivalence is expressed as, E=mc². E stands for energy equivalent to the mass m and c is the speed of light.
If you are riding a skateboard and hit something like a curb with the front wheels then the skateboard would stop due to the friction offered by the club but your body would fall forward due to the effect of that inertia.
According to Newton's first law, until pushed to alter its condition by the intervention of an external force,
Every object will continue to be at rest or in uniform motion along a single direction until/unless some external force is applied.
When the front wheels of a skateboard collide with something like a curb, then the skateboard will halt because of the friction created by the object, but your body will fall forward as a result of the inertia.
Learn more about Newton's First Law here, refer to the link;
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