<span>1.
</span><span>Efficiency is the
measure of how efficient a process is. It is used to assess the ability of a
process in avoiding waste energy, materials, money and time in doing a
desirable output. It is calculated as;
Efficiency = useful energy ouput / total energy input</span>
<span>.40 = useful work / 200</span>
<span>useful work = 80 joules</span>
Answer:B
Explanation:
Because chemical energy fuels your body with energy so without it u wont have enough energy to move.
Explanation : We know that two forces acting on the satellite.
The speed of the satellite and the force of the gravity on the satellite then the result , the satellite moves around the earth in a circular motion.
A satellite to move tangentially to a circular path, while revolving around the circular path because the centripetal force is acting on it.
So, we can say gravity is responsible for the motion of the satellite in a circular path.
Explanation:
A wave is a disturbance in a medium. For example, when some pebbles are thrown in water, the water particles gets disturbed. A wave is characterized by the following parameters i.e.
Frequency
Wavelength etc
The number of oscillations or vibrations in a medium is called the frequency of a wave.
Also, the distance between two consecutive crests and troughs is called the wavelength of a wave. The relationship between the wavelength and the frequency of a wave is given by :
Speed of wave = frequency × wavelength
