Answer:
1) Joule
2) kgm²/s²
3) 10%
Explanation:
Question 1)
Luminosity is defined as the total amount of energy released from an object in a unit amount of time.
This means Luminosity is the ratio of energy and time.
Unit of Energy is Joules and Unit of Time is seconds, so unit of Luminosity would be Joule per second or Watts.
So, from the given options, the unit which would be used in Luminosity calculations is Joule.
Question 2)
Work = Force x Distance
SI unit of Work is Joule
SI unit of Force is Newton or kgm/s²
SI unit of Distance is meter(m)
Unit of Work = Unit of Force x Unit of Distance
Joule = kgm/s² x m
Joule = kgm²/s²
This means, the correct description of joule in terms of SI base units is kgm²/s²
Question 3)
Value of gravitational constant from the experiment = Nm²/kg²
The accepted or actual value of the gravitational constant = Nm²/kg²
We need to calculate the percentage error. Percentage error is defined as:
Here, original value is the accepted value. Using the values in this formula, we get:
Thus, this means the percentage error in the calculation of gravitational constant was 10%.
The gravity of the Sun keeps the planets in their orbits rotating. The same as the Moon orbits the Earth because of the pull of earth's gravity, the earth orbits the Sun because of the pull of the Sun's gravitational pull.
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Answer: 1350kg/m3
Explanation:
Db = Mb/Vb
900= Mb/Vb
(where Db is the density of the block of wood = 900kg/m3, Mb is its mass and Vb is its volume
Df = Mf/Vf (where Df, Mf and Vf are the density, mass and velocity of the fluid respectively
note that the same mass is involved because the block of wood can only displace its own mass of the fluid
It displaces two-thirds of its own volume in the fluid.
2/3Vf = Vb
Vf = 2Vb/3
Db = Mb/Vb
900 = 2Mb/3Vf
2700Vf = 2Mb
1350Vf = Mb
since Mb = Mf
Df = 1350Vf/Vf
Df= 1350Kg/m3
Answer:
When two objects collide, a force is exerted on each object. The two forces are in opposite directions but the same strength. Even though the force on each object in a collision is the same strength, the objects will have different velocity changes if their masses are different.
Explanation:
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