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How is it that bats are able to fly at night without colliding with other objects?

If a person dives to the bottom of a swimming pool to pick up a coin, how would he feel as he swims toward the bottom ?

How can a bat tell the size of a flying insect ?

A water tank has steps inside it. A monkey is sitting on the topmost step (i.e. the fist step). The water level is at the ninth step. (1) He jumps 3 steps down and then jumps back 2 steps up. In how many jumps will be reach the water level? (2) After drinking water, he wants to go back. For this, he jumps 4 steps up and then jumps back 2 steps down in every move. In how many Jumps will be reach back the top step?

A pendulum bob of mass 10^-2kg is raised to a height 5xx10^-2m and then released. At the bottom of its swing, it picks up a mass 10^-3kg . To what height will the combined mass rise?

A water tank has steps inside it. A monkey is sitting on the topmost step (i.e., the first step). The water level is at the ninth step. (i) He jumps 3 steps down and then jumps back 2 steps up. In how many jumps will he reach the water level? (ii) After drinking water, he wants to go back. For this, he jumps 4 steps up and then jumps back 2 steps down in every move. In how many jumps will he reach back the top step? (iii) If the number of steps moved down is represented by negative integers and the number of steps moved up by positive integers, represent his moves in part (i) and (ii) by completing the following; (a) - 3 + 2 - ... = - 8 (b) 4 - 2 + .... = 8. In (a) the sum (-8) represents going down by eight steps. So, what will the sum 8 in (b) represent?

In a potato race, a bucket is placed at the starting point, which is 5 m from the first potato, and the other potatoes are placed 3 m apart in a straight line. There are ten potatoes in the line (see Figure).A competitor starts from the bucket, picks up the nearest potato, runs back with it, drops it in the bucket, runs back to pick up the next potato, runs to the bucket to drop it in, and she continues in the same way until all the potatoes are in the bucket. What is the total distance the competitor has to run?[Hint : To pick up the first potato and the second potato, the total distance (in metres) rim by a competitor is 2 x 5 + 2 x (5 + 3)]

When a lift is moving up with a uniform speed of 1 m/s. the weight of a man recorded bby a weighing machine in the lift is 70 kg . If the lift starts moving down with a uniform speed of 2 m/s, the weight of the man recorded by the weighing machine will be