Mechanics | Relativity Answers

A person reaches a point directly opposite on the other bank of a flowing river, while swimming at a speed of 5m/s at an angle of 120 degree with the slow. The speed of the flow must be
1. 2.5m/s
2. 3m/s
3. 4m/s
4. 1.5m/s

When a particle is projected at some angles to the horizontal,it has a range R and time of flight t1. If the same particle is projected with same speed at some other angle to have the same range its time of flight is t2, then,
1. t1 + t2 = 2R/g
2. t1 - t2 = R/g
3. t1t2 = 2R/g
4. t1t2 = R/g

A mass tied to a string moves in a verticle circle with a uniform speed of 5 m/s at the point where the string is horizontal breaks. the mass will reach a height above that point will be nearly (radius =1m)

A mass M is attached to an end of rod of length L.The mass goes around vertical circular path with the other end hinged at the center.What should be the minimum velocity of mass M at the bottom of circle so that mass completes a circle?

A tube of length L is filled completely with an incompressible liquid of mass M and close at both the ends.The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity V. The force exerted by the liquid at the other end is?

A skier starts from rest down a slope 500.0 m long. The skier accelerates at a constant rate of 2.00 m/s2.

What would the velocity of the skier at the bottom of the slope be.

if a 200 m/s running car pushes me , then will i be thrown with the same 200 m/s speed or more or less. when will my speed be highest and lowest?? and will the speed decrease in respect of time ??

statement:when the particle moves with uniform speed in a circular path then its accelaration and velocity are constant
why this statement is wrong

Four persons P,Q,R, and S are initially at the four corners of a square of side d. Each person now moves with a constant speed v in such a way that P always moves directly towards Q, Q towards R, R towards S, and S towards P. The four persons will meet after time?
1. d/2v
2. d/v
3. 3d/2v
4. They will never meet

Rain is falling 6Km/h making angle 30degree with the vertical towards east.a man is walking on horizontal road towards east 5Km/h.the speed with which the rain hits the man is approximately...