Vapor is usually made with water and it would be made with gas.
1) Forces acting on your body: force of gravity and normal reaction
2) Due to Newton's second law, N = mg
Explanation:
1)
When you sit on the computer, there are only two forces acting on you:
- The force of gravity, acting downward, of magnitude , where m is your mass and is the acceleration due to gravity, downward
- The normal reaction exerted by the chair on you, , acting upward
Your body is in equilibrium (it doesn't move), this means that the two forces balance each other, therefore:
2)
We can now apply Newton's second law of motion to this situation; this law states that the net force acting on a body is equal to the product between its mass and its acceleration. Mathematically,
where
is the net force
m is the mass
a is the acceleration
In this situation, the net force is
So the equation becomes
However, we observe that your body is at rest; therefore, the acceleration is zero:
a = 0
And therefore,
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Answer:
C
Explanation:
The density is what determines if it will float. Lower densities float, while higher densities sink. Density takes mass and volume into account.
Answer:
It takes 1600 seconds or hours to travel a distance of 20 km.
Explanation:
Given:
Speed of the motorcycle,
Distance traveled by the motorcycle,
We know that,
∴
Plug in 20 km for and 45 km/h for . Solve for time.
⇒ Time =
Therefore, the time taken to travel a distance of 20 km is 1600 seconds or hours.
Answer:
Explanation:
Recall that density is defined as and that relative uncertainty is defined as where is the uncertainty in the measure and a the measure, To find the uncertainty when two physical quantities are divided, their relative uncertainties are added and then multiplied with the division result of the quantities.
We have:
To find the percent uncertainty, we multiply the relative uncertainty by 100%.