Which statement is always true when nuclear fusion occurs?(1 point) A) The total number of protons and neutrons in each nucleus remains constant.

B) The number of protons in the resulting nucleus is less than in each starting nucleus.

C) The number of protons in the resulting nucleus is double that of a starting nucleus.

D) The combined number of protons and neutrons remains constant.

If the speed of a particle triples ,by what factor does its kinetic energy increase?

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

How do you tell if someone actually cares about you? and just say they do?