Which did Kepler notice about planetary motion that caused him to propose Kepler’s first law of orbital motion?
A. Most planets have highly elliptical orbits.

B. The distance between Mars and the sun is constant.

C. The planets have circular orbits.

D. The distance to the sun varies.

D. IS THE CORRECT ANSWER!

Abody of weight 60 kg is standing in a lift the lift going upward with a uniform velocity of 4.9 metre per second slows down and stops in two seconds then apparent weight of the body during the slow down process is

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Two vectors are shown. which statement best compares the vectors? vector x has greater magnitude than vector y. vector y has greater magnitude than vector x. the vectors have the same displacement. the vectors have the same direction.