Engineers and physicists dream of solving the world's energy supply problem by constructing power plants that would convert hydrogen to helium. our sun seems to have solved this problem. choose the statement below that correctly identifies a major obstacle to this potentially environmentally clean mode of energy production. choose one:
a. hydrogen gas is not readily available on the earth.
b. it currently takes so much energy to produce the high density and temperature required to fuse hydrogen to helium in the lab, that the energy we get out is less than we need to put in.
c. the amount of energy produced by converting an even tiny quantity of hydrogen to helium could not safely be controlled on earth.
d. being so close to the source of the resulting neutrinos would be fatal to life on earth.

c. The amount of energy produced by converting an even tiny quantity of hydrogen to helium could not safely be controlled on Earth.

Explanation:

There is not enough technology to create a containment system on Earth.

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible