A Mars rover has collected and analyzed several samples from the surface and atmosphere of Mars. NASA has processed most of the data but is looking for help in identifying two of the remaining elements from the samples. They know that both elements are main group elements belonging in either Group 2 or Group 18. Group 2 elements are highly reactive, while Group 18 elements are unreactive. Group 2 elements are also solid at room temperature, while Group 18 elements are gases at room temperature. The following information about unknown Element J and unknown Element Q has just arrived for you to examine. Based on the evidence, write a scientific explanation to justify the periodic table group in which the elements belong. Element JElement Q Mass0.5 g1.2 g Physical State at Room Temperature SolidGas Electrical Conductivity GoodNone Reaction with Oxygen* Yes (forms XO)No Reaction with Chlorine* Yes (forms XCl 2 )No

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

multiple

change tension

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.