Answer:
What forces act on a marble rolling down a ramp?
Answer: Gravity acts vertically downward. A normal force acts from the ruler toward the marble/ball in a direction that is perpendicular to the plane of the ruler. Friction acts in the direction opposite to which the marble/ball is moving. ... Friction slows down the marble/ball.
Answer:
20% of the human body float above the surface in the dead sea.
Explanation:
Given data,
The human density after inhaling, d₁ = 945 kg/m³
The human density after exhaling, d₂ = 1020 kg/m³
Therefore the average human density, d = 982.5 kg/m³
The density of the dead sea, D = 1230 kg/m³
The percentage of density of human body to the dead sea is,
P % = (982.5 / 1230) x 100 %
= 80 %
Therefore, the human body has 80% of dead sea density.
Hence, 20% of the human body float above the surface in the dead sea.
Answer:
Explanation:
Given:
vertical height of oil coming out of pipe, 
diameter of pipe, 
length of pipe, 
density of oil, 
viscosity of oil, 
Now, since the oil is being shot verically upwards it will have some initial velocity and will have zero final velocity at the top.
<u>Using the equation of motion:</u>
where:
v = final velocity
u = initial velocity
Putting the respective values:
<u>For Reynold's no. we have the relation as:</u>
Time and space are both relative
