Mechanics | Relativity Answers

The end a of a uniform rod AB of weight W is hinged a fixed point. The rod is held in equilibrium in a horizontal position by means of a string attached to B and to a point c vertically above A. The string is inclined at 60 degrees to the rod. Find the tension in the string and the reaction of the hinge.

A ladder 2.5m long weighing hundred kg rest with one end on a smooth vertical wall and with the other end on the floor. The lowest end of the ladder is hinged to a point distant 0.7m from the wall. Find the reactions of the wall and the hinge.

A uniform rod AB is of length l and weight 2W. It can turn freely about a smooth hinge at its upper end A. The rod is held in equilibrium by means of a horizontal force P applied at B, which is at a distance a from the vertical line through A. Find the value of P and show that the reaction at the hinge is W [(4l^2-3a^2)/(l^2-a^2)] ^1/2

The value of the g at a place decreases by 2% .The barometric height of mercury (a) increase by 2% (b) decreases by 2% (c) remain unchanged (d) sometimes increase and decrease

Two solids A and B float in water . It is observed that A floats with half its volume immersed and B float with 2/3 of its volume immersed . Compare the densities of A and B.

standing on the edge of a cliff 32.5m high, you drop a ball. Later you throw a second ball downward with initial speed of 11m/s. Which ball has greater increase in speed when in reaches base of the cliff or do they travel at same speed. Verify your answer with a calculation.

A flea hops in a straight path along a meter stick, starting at 0.7 cm and making successive jumps, which are measured to be 3.2 cm, 6.5 cm, 8.3 cm, 10.0 cm, 11.5 cm, and 15.5 cm. Express the answers to the following questions in scientific notation, with units of meters and an appropriate number of significant figures. What is the total distance covered by the flea in these six hops? What is the average distance covered by the flea in a single hop?

A car starts at rest and acquires a velocity of 70km pero hour in 30 mins.
FIND THE CAR’s ACCELERATION AND FIND THE DISTANCE TRAVELED IN THE FIRST 20 mins AND FIND THE DISTANCE TRACELED IN THE NEXT 20 more mins

The volume of an air bubble become three times as it rises from the bottom of a lake to its surface . Assuming atmospheric pressure to be 75 cm of Hg an density of water to be 1/10 of the density of mercury , the depth of the lake :-

A ball having a mass of 0.5 kg is moving towards the east with a speed of 8.0 ms-1.
After being hit by a bat it changes its direction and starts moving towards the north with
a speed of 6.0 ms−1. If the time of impact is 0.1 s, calculate the impulse and average
force acting on the ball.