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4.Which of the following is the most essential nutrient for a woman during her initial stages of pregnancy to prevent birth defects?(a) Thiamin(b) Folic acid(c) Vitamin C(d) Vitamin EAns:(b) Folic...

Folic acid is a B-vitamin that is essential for the proper development of the neural tube in a developing fetus. The neural tube is the embryonic structure that eventually forms the brain and spinal cord, and if it does not develop properly, it can result in birth defects such as spina bifida and anencephaly.

During the initial stages of pregnancy, it is especially important for women to consume adequate amounts of folic acid, ideally before conception and throughout the first trimester. The...

2.Which of the following vitamins are called fat-soluble vitamins?(a) vitamin B(b) vitamin E(c) vitamin C(d) vitamin B2Ans (b) vitamin E.

Easy trick you can follow is remember the name Kedar

R is not a vitamin and remaining four are fat soluble.

It will be easy to remember.

1. Which of the following vitamins cannot be produced by our body?(a) vitamin A(b) vitamin K(c) vitamin C(d) All of the above Ans: (d) All of the above.

Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that cannot be produced by the human body, which means it must be obtained from dietary sources. Vitamin C is essential for a wide range of biological functions, including collagen synthesis, wound healing, iron absorption, and immune system function.

Although most animals can synthesize their own vitamin C, humans and other primates lack the necessary enzyme L-gulonolactone oxidase, which is required for the synthesis of...

Define centre of mass and centre of gravity? When will they be equal?

A hypothetical point at which the whole mass of a body is considered to be concentrated is known as centre of mass.

While the hypothetical point at which whole weight of a body is considered to be concentrated is known as centre of gravity.

As we know weight is g times the mass of the body and g decreases with altitude, if we ignore this variation of g over the vertical dimension of body(I e. in uniform gravitational field), then it's centre of mass and centre of gravity will be equal.

Calculate the distance below and above the surface of the earth, at which the value of acceleration due to gravity becomes ¼ th of that at earth’s surface?

Formula Setup:

g at height h from the Earth's surface = g' = g (R/(R+h))^2
g at depth h below the Earth's surface = g' = g(1 - h/R)

To find: h where g' = g/4

At height h above the Earth's surface:

g' = g(R/(R+h))^2

g/4 = g (R/(R+h))^2

1/4 = (R/(R+h))^2

1/2 = R/(R+h)

R + h = 2R

h = 2R - R

So, h = R

At depth h above the Earth's surface:

g' = g (1 - h/R)

or, g/4 = g (1 - h/R)

or, 1/4 = 1 - h/R

or, h /R = 1- 1/4

or, h/R = 3/4

So, h = 3R/4

Hence, at height h = R above the Earth's surface and at a depth h = 3R/4...

The blocks A and B have equal masses. The surface of A is smooth but that of B has a friction coefficient of 0.1 with the floor. Block A is moving at a speed of 10 m/s towards B which is kept at re...

a) In a lab frame of reference,

Velocity of center of mass is given by,

v'=(mv_OA+ mv_OB)/2m

Now, in center of mass frame of reference,

Since, there will be perfectly elastic collision. After collision, they exchange their velocity.

In lab frame of reference,

Deceleration due to the friction =µg

From kinematics we have,

V_F=V_B-µgt

Since the final velocity of B is zero, we get t=10s.

Distance travelled d is given by,

d = V_Bt - (µgt²)/2

Inserting given values, the distance travelled by block is 50m.

b)...