A person travelling in a fast spaceship measures the distance between the earth and the moon. Is it the same, smaller or larger than the value quoted in this book?

A sine wave is travelling ina medium. The minium distance between the two particles, always having same speed is

If the distance between the Earth and Sun were to be doubled from its present value, the number of days in a year would be

A rocket is fired from the earth. The body is projected the distance between the earth of the moon is r & the mass of the earth is 81 times the mass of the moon. The gravitational force on the rocket will be zero, when its from the moon is

Suggest a way to measure: a. the thickness of a sheet of paper, b. the distance between the sun and the moon.

Find the accelerationof the moon with respect to the eath from the following data, Distance between the earth and the moon =3.85xx10^5 km and the time taken by the moon to complete one revolution around the earth =27.3days

Two waves, each having a frequency of 100 Hz and a wavelength of 2.0 cm, are travelling in the same direction on a string. What is the phase difference between the waves (a) if the second wave was produced 0.015 s later than the first one at the same place, (b) if the two waves were produced at the same instant but the first one was produced a distance 4.0 cm behind the second one ? (c) If each of the waves has an amplitude of 2.0 mm, what would be the amplitudes of the resultant waves in part (a) and (b) ?