Geetha takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.

Suppose a man stands at a distance from a cliff and claps his hands . He receives an echo from the cliff after 4 second . Calculate the distance between the man and the cliff . Assume the speed of sound to be 343 m s^(-1)

A source emitting sound of frequency 180 Hz is placed in front of a wall at a distance of 2 m from it. A detector is also placed in front of the wall at the same distance from it. Find the minimum distance between the source and the detector for which the detector detects a maximum of sound. Speed of sound in air =360ms^-1 .

Dhivya was a talented cyclist. She used to go to school in her bicycle presented by her Dad. She used to ride faster, as she always goes late from home. When she was going by the road one day. She skid down from her cycle and got injured. That was a curved road where she has to take a turn, and as she was in hurry, this incident has happened. Why does Dhivya skid from her cycle ? (i) What is the condition for skidding ? (ii) Derive an equation for the Angle for safer riding.

As mosquito is sitting on an L.P. record disc rotating on a trun tabel at 33 1/3 revolutions per minute. The distance of the mosquito from the centre of the turn table is 10 cm. Show that the friction coefficient between the record and the mosquito is greater than pi^2/81 . Take g=10m/s^2

The energy from the sun reaches just outside the earth's atmoshphere at a rate of 1400 W m^(-2) . The distance between the sun and the earth is 1.5 xx 10^(11) m . (a) Calculate the rate at which the sum is losing its mass. (b) How long will the sun last assuming a constant decay at this rate? The present mass of the sun is 2 xx 10^(30) kg

Gita rides with her father’s bike to her uncle’s house which is 40 km away from her home. She takes 40 minutes to reach there. Statement 1 : She travels with a speed of 1 km // minute . Statement 2 : She travels with a speed of 1 km // hour .