Cho mạch điện biết R1=8 ôm, r2=10 ôm, R3=12 ôm, Uab=36v tính r4 để I là bằng nhau tại mỗi điện trở

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Which are examples of projectile motion? choose all that apply a. a soccer ball rolling across the ground in the northeast direction b. a car turning a corner, so it is heading south c. a javelin flying through the air d. a tennis ball lobbed over the net

In the first law of thermodynamics, triangle e=q-w, what does q stand for