Part b–short problems11. the electric potential at a certain point is space is 12 v. what is the electric potential energy of a –3.0 c charge placed at that point? a) +4 jb) –4 jc) +36 jd) –36 je) zero μj12. a completely ionized beryllium atom (net charge = +4e) is accelerated through a potential difference of 6.0 v. what is the increase in kinetic energy of the atom? a) zero evb) 0.67 evc) 4.0 evd) 6.0 eve) 24 ev14. a conducting sphere has a net charge of –6.4 × 10–17c. what is the approximate number of excess electrons on the sphere

answer: the answer is a

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.