Answer:
The amount of time needed for this heating to occur is 126.25 min
Explanation:
Given;
power required to heat the room = 2kW
volume of the room = 5 m X 5 m X 6 m = 150 m³
atmospheric pressure at sea level = 101 Kpa
Internal energy available in this room, E = PV
= 101 Kpa*150m³
= 15,150 Kpa.m³ = 15,150 KJ
P*t = E
where;
t is the time required to heat this room
1 kW = 3600 kJ/h
2 kW = 7200 kJ/h
Therefore, the amount of time needed for this heating to occur is 126.25 min
Absolutely. There is a force of gravitation between every two specks of mass. There is a gravitational force between the lint in your pocket and the tissue that the mayor of your city dropped into the trash 5 minutes ago. Everything attracts everything else by gravity. But the forces are so weak that we don't notice them compared to the force of the Earth.
The density of hematite ore is <u>4.78 g/cm³</u>.
Let the mass of the ore be m₁ , the volume of the flask <em>V</em>, total mass of water and ore M, mass of water be m₂, density of ore ρ₁ and the density of water be ρ₂.
Density of a substance is defined as the mass per unit volume.
The mass of water in the flask is given by,
Calculate the volume V₂ of the water in the flask.
Calculate the volume V₁occupied by the ore in the flask.
1 ml is equivalent to 1 cm³.
Calculate the density of the ore.
The density of the hematite ore is found to be 4.78 g/.cm³
Answer:
= = 140 m / s
Explanation:
This is a projectile launch, in this case the components of the initial velocity are seen
Since there is no rice in the X axis, so the velocity is vx, it must be constant, at all times
= = 140 m / s
The vertical component of velocity changes due to having applied the gravity fiate
= - g t
The net force is zero due to the direction.
We need to know about force resultant to solve this problem. The force resultant is the total net force applied to the object according to the direction. It can be written as
R = F1 + F2 + ... + Fn
where R is force resultant (net force)
From the question above, we know that
F1 = F2 = F N
Because the direction is the same, the force will be minus each other.
R = F1 - F2
R = F - F
R = 0 N
Hence, the net force is 0 N
Find more on net force at: brainly.com/question/14361879
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