According to Newton’s law of universal gravitation, which statements are true? a As we move to higher altitudes, the force of gravity on us decreases.
b As we move to higher altitudes, the force of gravity on us increases.
c As we gain mass, the force of gravity on us decreases.
d As we gain mass, the force of gravity on us increases.
e As we move faster, the force of gravity on us increases.

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.

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c