A Celcius and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers fall of 72. The fall in temperature in Celcius scale will be (a) 40 °C
(b) 70°C
(c) 50 °C
(d) 22.2 °C

Explanation Needed!!!
Process is required

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

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