Asmall mirror is attached to a vertical wall, and it hangs a distance of 1.70 m above the floor. the mirror is facing due east, and a ray of sunlight strikes the mirror early in the morning and then again later in the morning. the incident and reflected rays both lie in a plane that is perpendicular to both the wall and the floor. early in the morning, the ray is observed to strike the floor at a distance of 3.75 m from the base of the wall. later on in the morning, the ray strikes the floor at a distance of 1.18 m from the wall. the earth rotates at 15.0 degrees per hour. how much time (in hours) has elapsed between the two observations

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

unlike poles attract

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )