Lunar eclipse last longer than the solar eclipse because the length of the earth’s umbral shadow cone is more than three times the average distance between the moon and the earth, so the shadow is relatively wide at the point where the moon crosses it.
Goiter is common in hilly areas because there is deficiency of Iodine in the water.
A detergent consists of hydrophilic and hydrophobic ends. In case of dirt the detergent pushes the dirt off the surface of the wet surface of the fabric. The washing machine provides the agitation.

An Ecosystem comprises of produces consumers and decomposers. The decomposers are bacteria and Fungi which degrade organic matter.
Sea water keeps the temperature moderate. Because of high specific heat it takes longer for water to get heated up or to get cooled. During summer days the land near the sea gets heated up quickly but the sea water remains cool and thus cool breeze blowing from the sea reduces the heat in the adjoining land area. the land gets cooled quicker but the sea water remains warm and thus the land gets warm breeze from the sea. But the land farther inside does not have this advantage. This accounts for the difference in the climatic conditions.

When electric current passes through the fluorescent lamp, the mercury gets very hot and changes to a gas. A short of rays is given off by the gas. The rays when strike against a coating of special material inside the glass tube, it makes the special material glow.

In hot coffee, the kinetic energy of the molecules is greater because of the high temperature range in it. According to kinetic molecular theory this is not possible in cold coffee. So it is difficult to dissolve sugar in it.
All the energy is converted from potential energy to kinetic energy.

The principle of lever works in pushing a heavy grass mover. With the help of lever we can push the heavy things and even lift them. Moreover the gravity of the earth is 9.8 that attract each object. With this force while lifting the grass mover more force is required then pushing it.

Any particle or body which has horizontal motion and at the same time acts like a falling body can be classified as a projectile. It may seem a bit odd that the horizontal motion has no effect on the vertical motion or vice versa, but nevertheless this is true if air resistance is neglected. If a projectile is fired horizontally, it will have a velocity in that direction equal to that given it initially. At the same time it is travelling horizontally, it will fall toward earth, due to gravitational forces exerted on it. While the horizontal motion is at constant velocity the vertical motion is accelerated. This is the reason that a bomber does not drop a bomb when it is vertically above the target.
The work done on a machine or the energy provided to the machine is called input. Let effort P acts through a distance d then work done on machine is Pd.

The work done by the machine is called output. If a machine overcomes a force W through distance D, then the useful work done by the machine is W x D. Thus:

Output = Weight x Distance through which the weight acts
i.e. Output = W x D

If we think of an ideal machine which has output equal to the input, the efficiency of an ideal machine is thus one or 100. Thus for an ideal machine:

If we drop a body from a certain height, it falls to the ground and its velocity continues to increase till it strikes the ground. The body, therefore, gets accelerated as it falls freely, whether light or heavy objects are dropped, they will reach the ground at the same time and the acceleration will reach the ground at the same time and the acceleration will be the same.

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