
what is the order of human mass ...

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we know g=9.81 and if we calculate we should get π2=9.87.These 2 values are almost same!!!!! Why give reason??????? ...

A rocket with a liftoff mass 20,000 kg is blasted upwards with a an initial acceleration of 5 m/s^2 .Calculate: the initial force of the blast : 1) 1 x 10^5 N 2) 3 x 10^5 N 3) 2 x 10^5 N 4) 4 x 10^5 N ...

The volume of a cube in m^3 is equal to the surface area of it in m^2.The volume of the cube is; a) 64m^3 b)216m^3 c)512m^3 d)196m^3 ...

When a body is dropped, it falls with a speed proportional to its weight. Is it: (1) Always true (2) True only if objects fall in a vacuum (3) True only if objects fall through air (4) Never true ...

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Two particles ,1 and 2, move with constant velocities v1 and v2 . At the initial moment their radius vectors are r1 and r2 . How must these four vectors be interrelated for the particles to collide ? ...

Two children stand on a large, sloping hillside that can be considered as a plane. The ground is just suﬃciently icy that a child would fall and slide downhill with a uniform speed as the result of receiving even the slight ...

In a meter bridge experiment, the resistance to be measured is connected in the right gap and a known resistance in the left gap has a value of 50±0.2 Ω when the null point is judged to be at 60±0.2 cm. The student notes t ...

A micrometer screw gauge with pitch of 0.5 mm and 50 divisions on circular scale is used to measure the diameter of a thin wire. Initially, when the gap is closed, the fourth division coincides with the reference line. Three ...

A body is projected with a speed u in such a direction that the maximum height obtained is equal to its horizontal range. The horizontal range is a)8u2/17g b)5u2/17g c)6u2/13g d)u2/2g ...

A man is moving at the speed of 3 km/h due East to him it appears that the wind is blowing from the North direction . Now if he doubles his speed. The wind appears to blow from the North east direction . Then find the magnitu ...

*Image* My approach... Initially height is h and let after the temp. is increased to 100°C the height be h'. The buoyant force(U)=h*A*p*g(Initially,and A is the area of cross section of the cylinder) After the temp. increase ...

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If current I passes through resistance r in time t , the amt of heat energy produced = I2rt My question is that why is this I2 and not I? ...

the angles which a vector A = i+j+ 2 k makes with X Y Z axes respectively are a) 60° 60° 60° b) 45° 45° 45° c) 60° 60° 45° d) 45° 45° 60° ...

A particle is dropped vertically from rest from a height. What will be The time taken by it to fall through each successive distances of 1m? ...

A point moves with uniform acceleration and v1,v2,v3 denote the average velocities in the 3 successive time intervals of time t1,t2,t3 . which of the following is true ? a)(v1v2):(v2v3)=(t1t2):(t2+t3) b)(v1v2):(v2v3)=(t1 ...

A cannon ball is fired with a velocity v is an direction making an angle θ with the horizontal. At the highest point of its path it breaks into 2 parts of equal masses.One of the parts retraces the initial path of the ball.T ...

The sum of two forces acting at a point is 16N. If the resultant force is 8N and its direction is perpendicular to minimum force then the forces are a)6N and 10N b)8N and 8N c)4N and 12N d)2N and 14N ...

if A X B = A . B then angle between A&B is ? ...

100 coplanar forces each equal to 10N act on a body. Each force makes an angle π/5 with the preceding force. What is the resultant ? ...

What is the the angle between P and the resultant of (P + Q)and (PQ) ? ...

2 balls of same mass are thrown horizontally from the top of a tower in the opposite direction with velocities 3m/s and 4m/s. The distance between the balls when their velocities are mutually perpendicular will be nearest to ...

which of the following sets of concurrent forces maybe in equilibrium a)3N,5N,9N b)3N,5N,1N c)3N,5N,15N d)3N,5N,6N ...

A fireman wants to slide down a rope. The breaking load for the rope is 3/4 of the weight of the fireman. With what minimum acceleration should he slide down a)g b)3g/4 c) g/4 d)g/8 ...

How much force act on a body whose momentum is constant? a. 0 b. large force c. small force d. none of these ...

A force produce an acceleration of 2 m/s2 in a body A and 5 m/s2 another body B. Then the ratio of mass of A to the mass of B is a. 1/(2.5) b. 2.5 c. 2/(2.5) d. (3.5)/(2.5) ...

From a rifle of mass 4 kg,a bullet of mass 50 gm is fired with an initial velocity of 35 m/s. The initial recoil velocity of the rifle is a. 0.4375 m/s b. 0.5375 m/s c. 0.6375 m/s d. 0.3375 m/s ...