Urgent if earths gravitational field strength is 10 n/kg how many newtons does a 30kg object weigh

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.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?