The magnitude of the resultant of two concurrent forces is a minimum when the angle between them is (1) 0⁰ (2) 45⁰ (3) 90.⁰ (4) 180.⁰

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.