0 A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If the centre of the target is level with
the rifle, how high above the target must the rifle barrel
be pointed so that the bullet hits dead centre?​

What are the phases shown in a and d called?

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.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.