21. An object of height 4 cm is placed at a distance of 15 cm in front of a concave lens of power -10 dioptre. The size of the image would be: 3 points

-2.5 cm

2.8 cm

1.6 cm

-1.8 cm

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be

If the new moon happens on january 15th, what shape will it be on february 6th?

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia