The nucleus of any atom requires a strong force to hold it together. this strong force is required because

a)
the nucleus of any atom is so small.

b)
protons and neutrons repel each other.

c)
positive protons in the nucleus repel each other.
eliminate

d)
the charges of the protons and the electrons cancel each other out.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.