If the rate of change of the side of a square is 0.05 cm/sec, then the rate of change in the area of the square when the side is 10 cm is

The length of the subnormal to the curve 2x²+3xy-2y²=8 at (2, 3) is

Water is being poured into the inverted conical vessel at the rate of 1.5 cubic meter per minute. Its depth is always equal to twice its radius. The level of water is rising at the rate of 3/8π meter per minute when its depth is

The distances travelled by a particle in time t is given by s=t³-2t²-3t+5. The velocity of the partial when t=2 sec. is

The sum of three numbers is 30. The first plus three times the second plus four times the third add on to 80. The numbers so that the product of all three is as large as possible are

If the tangent at θ=π/4 to the curve x=a cos³θ, y= a sin³θ meets the x and y axis in A and B, then the length of AB is

The approximate value of cos 45⁰, given that 1⁰=0.1745 radian is

Angle between the tangents to the curve y=x²-5x+6 at the points (2, 0) and (3, 0) is

The pressure p and the volume v of gas are connected by the relation pv=300. If the volume is increasing at the rate of 0.6 cubic cm per minute then the rate of change in pressure of the gas when the volume is 30 cubic cm is

A gas holders contain 100 cubic ft of gas at a pressure of 5 lb per sq. inch. If the pressure is increasing at the rate of 0.05 lb per sq. inch per hour, then the rate of decrease of the volume assuming Boyle’s law pv=a constant is