Which of the following quantities for an object should be known to calculate its density? The space it occupies The heat present
2 answers:
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Answer:
A. Density is proportional to mass and inversely proportional to volume
Explanation:
Density can be defined as the property that matter has, whether solids, liquids or gases, to be compressed in a given space.
The expression that relates the density with the another values is given by,
Where,
(It is directly proportional to the mass of the object)
(It is inversely proportional to the volumen of the object)
<em>Therefore density is directly proportional to the mass and inversely proportional to the volumen.</em>
Answer:
A. 49 joules
Step By Step Solution:
Via kinematic equations we can must first determine the velocity of this object after 10 meters (since halfway of 20 meters is 10).
Where the initial velocity is zero since it's held at a height of 20 meters, hence it's not moving initially, g is the average gravity on Earth 9.8 m/s^2 and d is the distance this object will travel so 10 meters. By plugging these values in we obtain:
And the equation for kinetic energy is :
So the kinetic energy halfway after being released is 49 joules.