You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?
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The force applied to pull an object is 200 N and the distance it sleds through the snow is 500 meters, so the amount of work done over here is 1,00,000 Nm.
What is Work?
When an external force moves an object over a distance, at least a fraction of that force must be exerted in the displacement's direction. This is known as work in physics. By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = f.d, to mathematically describe this idea.
According to the question, the given values are :
Distance, d = 500 meters
Force, f = 200 Newton
So the formula for work done= force× displacement
W = 200 × 500
W = 1,00,000 Nm
Hence, the work done over here is 1,00,000 Nm.
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Answer:
Kinetic Energy = 1/2 mass*velocity^2
K=1/2mv^2
Therefore if you reduce the speed of an object by 1/2, K reduced to 1/4 its value.
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dens = mass/volume. after crushing, vol less so density more. the actual density of the metal is the same, density of can changes
Final answer:
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.
Explanation:
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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