Answer:
20 Joules
Explanation:
Work is done whenever a force moves a body through a certain distance in the direction of the force. So, work done is the product of force and distance moved.
Therefore, we have;
Work done = Force x distance
i.e Wd = Fs
Given that: F = 20 N and s = 1 m, then;
Wd = 20 N x 1 m
= 20 Nm
The work done by the father is 20 Joules(Nm).
Answer:![3.6\ kW](https://tex.z-dn.net/?f=3.6%5C%20kW)
Explanation:
Given
Power Supplied
[/tex]
Efficiency of the motor ![\neta =90\%](https://tex.z-dn.net/?f=%5Cneta%20%3D90%5C%25)
and ![\neta =\dfrac{\text{Power output}}{\text{Power input}}](https://tex.z-dn.net/?f=%5Cneta%20%3D%5Cdfrac%7B%5Ctext%7BPower%20output%7D%7D%7B%5Ctext%7BPower%20input%7D%7D)
![\Rightarrow 0.9=\dfrac{P_{out}}{4}](https://tex.z-dn.net/?f=%5CRightarrow%200.9%3D%5Cdfrac%7BP_%7Bout%7D%7D%7B4%7D)
![\Rightarrow P=0.9\times 4](https://tex.z-dn.net/?f=%5CRightarrow%20P%3D0.9%5Ctimes%204)
![\Rightarrow P=3.6\ kW](https://tex.z-dn.net/?f=%5CRightarrow%20P%3D3.6%5C%20kW)
So, vacuum cleaner delivers a power of ![3.6\ kW](https://tex.z-dn.net/?f=3.6%5C%20kW)
Answer:
v = 7.95 m/s
Explanation:
Given that,
Wavelength of a wave, ![\lambda=53\ cm=0.53\ m](https://tex.z-dn.net/?f=%5Clambda%3D53%5C%20cm%3D0.53%5C%20m)
Frequency of a wave, f = 15 Hz
We need to find the speed of the wave. The speed of a wave is given by :
![v=f\lambda\\\\v=15\ Hz\times 0.53\ m\\\\v=7.95\ m/s](https://tex.z-dn.net/?f=v%3Df%5Clambda%5C%5C%5C%5Cv%3D15%5C%20Hz%5Ctimes%200.53%5C%20m%5C%5C%5C%5Cv%3D7.95%5C%20m%2Fs)
So, the wave move with a speed of 7.95 m/s.
Answer:
Zero
Explanation:
Given the equation of an ellipse:
![\frac{x^2}{a^2}+\frac{y^2}{b^2}=1](https://tex.z-dn.net/?f=%5Cfrac%7Bx%5E2%7D%7Ba%5E2%7D%2B%5Cfrac%7By%5E2%7D%7Bb%5E2%7D%3D1)
The eccentrity of an ellipse is given by:
![e=\sqrt{1-\frac{b^2}{a^2}}](https://tex.z-dn.net/?f=e%3D%5Csqrt%7B1-%5Cfrac%7Bb%5E2%7D%7Ba%5E2%7D%7D)
For a circle, we have
![a=b](https://tex.z-dn.net/?f=a%3Db)
Therefore the eccentricity of a circle is
![e=\sqrt{1-\frac{1^2}{1^2}}=0](https://tex.z-dn.net/?f=e%3D%5Csqrt%7B1-%5Cfrac%7B1%5E2%7D%7B1%5E2%7D%7D%3D0)
Answer:
The answer is gravity
Explanation: Hope this helps:)