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A time varying power P=2t is applied on a particle of mass m. Find kinetic energy and velocity of particle as function of time

Power is a physical concept with several different meanings, depending on the context and the available information. We can define power as the... View Article

Static electricity can be produced by______ (a) Only induction (b) Only friction (c)Only chemical reaction (d) Induction and friction

The correct answer is (d) Induction and friction Static electricity refers to an imbalance between the electric charges in a body,... View Article

A recurring deposit account of Rs 1,200 per month has a maturity value of Rs 12,440. If the rate of interest is 8% and the interest is calculated at the end of every month; find the time (in months) of this Recurring Deposit Account.

Given As per the given data P=Rs.1200 Nmberofmonths=n Intrest rate=8% MaturityAmount=Rs.12440 Find out We have to determine the... View Article

We wish to obtain same sized image of an object, using a concave mirror of focal length 15 cm. where should be the object placed from the mirror?

The real and inverted image produced by a concave mirror becomes of equal size to the object when both object and images are situated on the... View Article

A closed loop carrying current I lies in the x-z plane. The loop will experience a force if it is placed in a region occupied by a uniform magnetic field along: (a) x-axis (b) y-axis (c)z-axis (d) none of these

The correct answer is (d) none of these A closed loop carrying current I lies in the x-z plane. From the general equation we know that If the... View Article

The given figure gives a match stick pattern of triangles. Find the general rule that gives the number of matchsticks in terms of the number of triangles.

From the figure we observe that in the given matchstick pattern, the number of matchsticks are 3, 5, 7 and 9 which is 1 more than the twice... View Article

A cone, a hemisphere and a cylinder stand on equal bases of radius r and have equal heights h.Prove that their volumes are in the ratio 2:3:1

Given A cone, a hemisphere and a cylinder stand on equal bases of radius r and have equal heights h. To Prove We have to prove that their... View Article

The difference between a two digit number and the number obtained by the interchanging the digits is 27. What is the difference between the two digits of the number?

Given The difference between a two digit number and the number obtained by the interchanging the digits is 27 Find out We have to... View Article

In how many ways can 5 boys and 5 girls sit in a circle so that no two boys sit together?

Permutation relates to the act of arranging all the members of a set into some sequence or order. The combination is a way of selecting... View Article

Find out the correct option from the following. (a) The magnification is positive for all virtual images and is negative for all real images. (b) The magnification of the concave lens and convex mirror is always positive whereas the magnification of the convex lens and concave mirror can be positive or negative depending on the position of the object before the lens. A. Only (a) is true. B. Only (b) is true. C. Both (a) and (b) are true. D. Both (a) and (b) are false.

Magnification is the increase in the image size produced by spherical mirrors with respect to the object size. It is the ratio of the height of... View Article

After spending 80% of his income and giving 10% of the reminder to a charity, a man has Rs.46260 left with him. Find his income.

After spending 80% of his income and giving 10% of the remainder to a charity, a man has Rs.46260 left with him. Find his income. Let the... View Article

If a line makes angles 90°, 135°, 45° with the x, y and z-axes respectively, find its direction cosines.

Let the direction cosines of the line be l, m and n. Here let α = 90°, β = 135° and γ = 45° So, l = cos... View Article

If (z³ – 3)² 16 = 0 then the value of |z| is

Modulus of the complex number is the distance of the point on the argand plane representing the complex number z from the origin. Let P is the... View Article

The sum of the digits of a 3 digit number is subtracted from the number. The resulting number is always_____

The sum of the digits of a 3 digit number is subtracted from the number. The resulting number is always Divisible by 9 Let the 3-digit... View Article

If three equal charges q are placed at the vertices of an equilateral triangle of side l, what is the net potential energy of the system?

The electric potential at a point in an electric field is defined as the amount of work done in moving a unit positive charge from infinity to... View Article

The internal bisector of an angle of a triangle divides the opposite side internally in the ratio of the corresponding sides containing the angle. Prove it.

GivenConsider a triangle ABCLet AD be the internal bisector of ∠BAC which meet BC at D To Prove BD/ DC = AB/AC Construction... View Article

Find the area of the triangle whose perimeter is 22cm. One side measures 9cm and the difference of the other two sides is 3cm.

Given Perimeter is 22 cm one side = 9 cm Difference of the other two sides =3 cm. Find out We have to determine the area of the... View Article

Derive the expression for slope of a line y=mx+c

Consider a line L with slope m cuts the y-axis at a distance of c units from the origin. Here, the distance c is called the y-intercept of the... View Article

If a, b, c are in A.P. and P is the A.M. between a and b, and q is the A.M. between b and c, show that b is the A.M. between p and q.

Given As per the given details a, b, c are in A.P. P is the A.M. between a and b Q is the A.M. between b and c To Prove We have to... View Article

Mutually perpendicular tangents TA and TB are drawn to y2=4ax, minimum length of AB is equal to____

Mutually perpendicular tangents TA and TB are drawn to y2=4ax, minimum length of AB is equal to 4a Chord of contact of mutually... View Article

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