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A rocket is fired vertically with a speed of 5 kms-1 from the earth’s surface. How far from the earth does the rocket go before returning to the earth

asked May 29, 2021 in Physics by Doubtly (98.9k points)

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1 answer 994 views

The position vector of a moving particle at time t is r=3i+4t^2j-t^3k .. Its displacement during the time interval t=1 s to t=3 s is

asked May 28, 2021 in Physics by Doubtly (98.9k points)

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If a unit vector is represented by 0.5i +0.8 j +ck then the value of 'c' is

asked May 28, 2021 in Physics by Doubtly (98.9k points)

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The area of the region bounded by the curve y = 2x – x2 and x – axis is

asked May 28, 2021 in mathematics by Doubtly (98.9k points)

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The point on the curve 6y = x3 + 2 at which y – co-ordinate is changing 8 times as fast as x– co-ordinate is ______________

asked May 28, 2021 in mathematics by Doubtly (98.9k points)

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The joint equation of bisectors of angles between lines x = 5 and y = 3 is ___________

asked May 28, 2021 in mathematics by Doubtly (98.9k points)

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Derivative of log (secθ + tanθ ) with respect to secθ at θ = π/4 is ____________

asked May 28, 2021 in mathematics by Doubtly (98.9k points)

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In Δ ABC (a – b)2 cos2 2 c + (a + b)2 sin2 2 c =

asked May 27, 2021 in mathematics by Doubtly (98.9k points)

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If r.v. X : waiting time in minutes for bus and p.d.f. of X is given by

asked May 27, 2021 in mathematics by Doubtly (98.9k points)

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Three identical masses m are kept at the vertices of equilateral Δ of side ‘a’.

asked May 26, 2021 in Physics by Doubtly (98.9k points)

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The sum of two numbers is 128 and their difference is 16. Find the numbers.

asked May 26, 2021 in hots by Doubtly (98.9k points)

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5 Chairs and 4 Tables Together Cost ₹5600, While 4 Chairs and 3 Tables Together Cost ₹ 4340. Find the Cost of Each Chair and that of Each Table

asked May 26, 2021 in hots by Doubtly (98.9k points)

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5 books and 7 pens together cost Rs 79 whereas 7 books and 5 pens together cost Rs 77, find the total cost of 1 book and 2 pens.

asked May 26, 2021 in hots by Doubtly (98.9k points)

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Shabana’s age 10 year hence will be twice as Juhi’s present age.

asked May 26, 2021 in hots by Doubtly (98.9k points)

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Uncertainty in position of a particle of 25 g in space is 10–5 m. Hence, uncertainty in velocity (m s–1) is (Planck’s constant, h = 6.6 × 10–34 Js)

asked May 25, 2021 in random by Doubtly (98.9k points)

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In a hydrogen atom, if the energy of an electron in the ground state is – 13.6 eV, then that in the 2nd excited state is

asked May 25, 2021 in random by Doubtly (98.9k points)

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Which of the following ions has the maximum magnetic moment ?

asked May 25, 2021 in random by Doubtly (98.9k points)

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Energy of H-atom in the ground state is –13.6 eV, hence energy in the second excited state is

asked May 25, 2021 in random by Doubtly (98.9k points)

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Identify from the following reactions the reactants that undergo oxidation and reduction

asked May 23, 2021 in Chapter 3: Chemical reactions and equations by anonymous

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5. Observe the following picture a write down the chemical reaction with explanation.

asked May 23, 2021 in Chapter 3: Chemical reactions and equations by anonymous

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