Answer:
200 Watts.
Explanation:
Power is defines as the amount of work expended per unit time. Mathematically, it is expressed as Power = Workdone/Time
Given parameters
Energy used up 100Joules
Distance moved by brick = 1 meters
Time taken by the machine = 0.5 secs
Power can also be written as Energy/Time
Required
We need to calculate the amount of power used up.
Power = 100J/0.5s
Power = 100/(1/2)
Power = 100 * 2/1
Power = 200Watts.
This shows that the machine would expend 200Watts of power
Using the wavelength expressions, such as the distance between two peaks of a wave, that of the frequency as a function of the speed and the wavelength, such as the period inversely proportional to the frequency we have to for the first question
the wavelength is the distance between the two ridges that is
For the second question the frequency is determined as the rate of change of the velocity versus the wavelength, that is
For the third question the period is inversely proportional to the frequency, therefore
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%.
Of what? Or if you just want one, than here:
An example of sublimate is dry ice turning directly into carbon dioxide from solid form.