Physics questions and answers in March 2021

11. Electrochemistry is important in many aspects of daily life. Define  voltaic cell . Fill in the blanks for the drawing of a voltaic cell that's made with copper/copper (II) nitrate (E° = 0.34 V)...
Explain what is meant by "field" and compare the properties of gravitational, electric, and magnetic forces in terms of particles affected, factors affecting the magnitude, and their relative strength...
An electron moves with an unknown velocity through a magnetic field of 1.56 T that points directly east. The electron experiences a force of 6.24 x 10^-15 N directly south. What is the magnitude and ...
By definition, the work done on a gas or liquid by a gas or liquid, is NOT: a) isovolumetric b) isotoner c) isothermal d) adiabatic A refrigerator lowers the temperature, or internal energy, of substa...
Which of the equations below regarding colors is correct? Choose all that apply. a) red = green + blue (light) b) black = cyan + magenta + yellow (pigment) c) white = red + green + blue (light) d) cya...
After two half-lives, how much of the original sample would remain? a) 6.25% b) 50% c) 25% d) 12.5% The half-life of Calcium-47 is 3.91 x 10^5 seconds. A sample contains 4.11 x 10^16 nuclei. How muc...
Exp1ain how the atomic model went from the billiard ball model to the plum pudding model? Which scientists influenced the progression of the atomic model? Check all that apply -Dalton -Rutherford -Boh...
That same 15 kg object is looked at by a human. The human is very strong and can apply a "psychic" force of 5000N. The human applies the 5000N force for 5 seconds and launches the object straight into...