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What if I only walked about 500 feet at the speed of light?

No object can actually travel at the speed of light. So 500 feet is a long way, you can't walk 1 foot at the speed of light. Only photons can move at the speed of light. Photons are particles of light. Its steady state has zero mass. The matter can be explained from the equation of relative momentum.

Here p is the relative momentum of an object, m0 is the mass of the object at rest and v is the velocity of the object. The equation implies that if the velocity (v) of an object is equal to the velocity of light (c), then the relative momentum (p) of the object will be indefinable. And if the velocity of the object is greater than the velocity of light, then the momentum will be a complex number. In reality the momentum of an object cannot be a complex number. So you understand, no matter how hard you try, you can't move at the speed of light at all. However, you can move at speeds close to the speed of light. In that case, things like slowing down of time or contraction of length will continue to happen. And your momentum will be much, much higher.

Equation of relative momentum

Is the earth like a point of sand compared to the solar system?

The diameter of a grain of sand can range from about 1/16 millimeter to 2 millimeters. The diameter of the earth is about 12,500 kilometers, which is 1 part of 12 thousandths of an astronomical unit. One asteroid (AU) is the distance of the sun from the earth, 14 crore 95 lakh 96 thousand kilometers. Although the extent of the solar system is reduced, it is equal to the orbit of Neptune, which has a diameter of 60 AU. However, in a broad sense, the diameter of the solar system is estimated at 4 lakh AU. So the ratio of the size of the solar system to the size of the earth can be from 8 lakh 20 thousand to 480 crore, depending on the diameter of the solar system we are holding. It is comparable to the ratio of the volume of a grain of sand to the volume of the Sahara Desert as one.

If an object travels at almost the speed of light, will time extend for it?

One of the basic ideas of the theory of relativity is that the speed of light is constant. This speed cannot be reduced or increased. The motion of any other object, however, is not constant, it depends on the position and motion of the observer. Suppose a person is moving at a speed close to the speed of light. Now the person who is observing this event will measure the time on his watch, the length of that time will be less than the length of time measured in that person's own watch. This means that time has slowed down for a person moving at a speed close to the speed of light. In relation to this matter is called time dilation. In the case where the matter is actually happening, he cannot comprehend. The more time he has measured in his own reference frame or context structure, the more time has elapsed. So the answer to this question is that if an object moves at almost the speed of light, time will expand for it.

If HCL + NaOH = H2O + NaCl then why not H2O + NaCl = HCL + NaOH?

Raunak Hasan, Hathazari, Chittagong

When NaCl (table salt) is added to water, it is ionized and dispersed in the water as sodium ion (Na +) and chloride ion (Cl-). Because, NaCl is a perfect ionic compound and water (H2O) is an excellent polar solvent. As a result, sodium ions (Na +) are attracted by the negative pole oxygen (Oδ-) of water and chloride ions (Cl-) are attracted by the positive poles of water hydrogen (Hδ +) and NaCl is separated. Hydration levels are formed around Na + and Cl.

This means that by reacting with NaCl water, new substances do not get a chance to become HCL and NaOH. NaCl is only dissolved in water and is ionized as follows:

NaCl (Solid) + H2O = Na + (Aq ueous) + Cl- (Aqueous) + H2O

1. What is the difference between mass and weight? 2. How do cells grow in the human body? Why lead?

1. If you get off the elevator too fast you will feel like you have lost weight. If you float in space then your weight will be zero. But in each case, your body mass will remain the same. What does this mean? Mass is the amount of matter in an object. But weight is the amount of gravitational force on an object. The weight of the same object is much less in Dhaka than in Everest. Because the force of gravity on that object is much less.

2. The cells of the human body grow through division. There are two types of cell division. A mitosis and miosis. In the process of mitosis, a cell usually divides into two cells after having completely replicated all of its DNA. Each new cell contains a complete copy of all DNA. These consist of 23 pairs of chromosomes. As a result of this division, the number of body cells increases. In the process of miosis, the germ cells divide and form germ cells (ovum and sperm). Why do cells divide? Because, after birth, human body grows. For this the cells begin to divide. If not, how will the body grow? Without it the skin or other organs of our body are eroded all the time. Cells begin to divide to make up for that loss. However, the signal of how many cells in any part of the body will be divided is already in the DNA. As big as my fingers will be, the finger cells will divide according to the instructions. Come to a certain limit and will no longer be divided. But if it decays for any reason, new cells will be formed. In addition, even if the skin is cut somewhere, the cells divide to fill it.

How do small things look big and clear under a microscope with the help of light refraction?

A typical microscope has a bi-convex lens. Its feature is that light from an object comes in a parallel line, exits through the lens, bends and reaches our eyes. As a result, light rays seem to be coming from much larger objects. Ordinary magnifying glass is also a kind of microscope. However, modern microscopes are much more complex and small things look much bigger and more beautiful.

Why are almost all the celestial bodies in the universe like the earth or the sun round?

The main reason is the force of gravity. The planets are formed by the accumulation of cosmic dust. Their mass continues to increase. Once their gravitational force begins to have an effective effect. As they revolve around the sun, the planets attract the surrounding dust and pull it toward the center. Attracts every point around the circumference from the center of the planet as equal. For example, the spokes of a rickshaw pull the wheel. The effect of this ball is that the planets contain spheres. The other planets and stars in the universe are similarly round. The middle of the big planets is a little swollen, not exactly round like a football. This is due to the effect of centrifugal force (centrifugal force) on the matter of the part along the equator as large planets rotate. For this the north and south poles of the earth are a little pressed, the equatorial region is a little swollen.

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2 years ago


As a student of physics I really loved reading the article..

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