A man is standing between two vertical walls 680m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 second respectively. What is the speed of sound in the air?

A man is standing between two vertical walls 680m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 second respectively. What is the speed of sound in the air?

A man standing on a road has to hold his umbrella at 30^0 with the vertical to keep the rain away. The throws the umbrella and starts running at 10 km/h. He finds that raindrops are hitting his head vertically. Find the speed of raindrops with respect to a. the road, b. the moving man.

A person (40 kg) is managing to be at rest between two verticle walls by pressing one wall A by hi hands and feet and the other wall B by his back figure. Assume that the friction coefficient between his body and the walls is 0.8 and that limiting friction acts at all the contacts. a. show that the person pushes the two walls with equal force. b. find the normal force exerted by either wall on the person Take g=10 m/s^2 .

(i) A man is standing between two vertical walls 680 m apart . He claps his hands and hears two distinct echoes after 0.9 second and 1.1 second respectively. (ii) A door is pushed , at a point whose distance from the hinges is 90 cm , with a force of 40 N. Calculate the moment of the force about the hiages.

To a man standing outside his house, the angles of elevation of the top and bottom of a window are 60^(@) and 45^(@) respectively. If the height of the man is 180 cm and if he is 5 m away from the wall, what is the height of the window? (sqrt3= 1.732)

To a man standing outside his house. The angles of elevation of the top and bottom of a window are 60^(@) and 45^(@) respectively. If the height of the man is 180 cm and if he is 5m away from the wall. What is the height of the window? (sqrt(3)=1.732) .

Gopal is worrying that his neighbour can peep into his living room from the top floor of his house. He has decided raise the height of the fence that is high enough to block the view from his neighbour’s top floor window. What should be the height of the fence? The measurements are given in the figure.

A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 se,conds and 1.1 second respectively. What is the speed of sound in the air? Given : Time of first echo, t_i = 0.9 s Time of second echo, t_2 = 1.1 s Distance between man and wall, d = 680 m To find : Speed of sound in air, V = ?