Calculate the net charge on a substance con- sisting of a combination of 9.0 x 10^13 protons and 4.1 x 10^13 electrons. the elemental charge is 1.6 x 10-19 c. answer in units of c.

Net charge,

Explanation:

Number of protons,

Number of electrons,

Charge on electron,

Charge on proton,

Net charge acting on the substance is :

or

So, the net charge on the substance is . Hence, this is the required solution.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.