Explaining Density

Physics

2 answers:

gregori [183]3 years ago

8 0

Answer:

Density is the relationship that exists between the mass of an object and the volume occupied by it. This means that if the mass remains constant and the volume of the object increases, then the density of the object is smaller. ... The concept of density can be used when two liquids are in a containe

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harkovskaia [24]3 years ago

7 0

Answer:

Density is a physical property of an object that measures how much mass occupies a certain amount of space.

Explanation:

Example answer.

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Answer:

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3) A driver in a 1000-kg car traveling at 24 m/s slams on the brakes and skids to a stop. If the coefticient of friction between

Natali5045456 [20]

Answer:

A) 37 m

Explanation:

The car is moving of uniformly accelerated motion, so the distance it covers can be calculated by using the following SUVAT equation:

$v^2 -u^2 = 2ad$ (1)

where

v = 0 m/s is the final velocity of the car

u = 24 m/s is the initial velocity

a is the acceleration

d is the length of the skid

We need to find the acceleration first. We know that the force responsible for the (de)celeration is the force of friction, so:

$F=ma=-\mu mg$

where

m = 1000 kg is the mass of the car

$\mu = 0.80$ is the coefficient of friction

a is the deceleration of the car

g = 9.8 m/s^2 is the acceleration due to gravity

The negative sign is due to the fact that the force of friction is against the motion of the car, so the sign of the acceleration will be negative because the car is slowing down. From this equation, we find:

$a=-\mu g$