I need help with all four questions the answer choices are 1 law 2 law 3 law

Which statement best describes how private industry decides where to spend the money on research and development

What are similarities and differences between refraction, reflection, diffraction and absorption?

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?