The angle of depression between the bird and the birdwatcher is 61.32°
In the question, it is said that the distance between two birds is 17.8ft and the distance between the first bird and the birdwatcher is 37.4ft. So, when we draw an image in our mind then we can say that this whole system forms a right-angle triangle with a base of 17.8ft and a hypotenuse of 37.4ft. As we know that to calculate the angle of depression we will use trigonometric equations here i.e.,
cos x = Base/Hypotenuse
cos x = 17.8 / 37.4
cos x = 0.48
x = cos⁻¹(0.48)
x = 61.32°
Thus, the angle of depression is 61.32°.
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Answer:
B. Photosynthesis occurs in all organisms
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Answer:
OPTION B is correct
Carbon
Explanation:
element can be defined as a pure substance which cannot be broken down by into smaller units through a chemical method, an element has atoms with identical numbers of protons in their atomic nuclei
Each element is composed of its own type of atom. And this gives the reason why chemical elements are all very different from each other. And all substance on Earth has atoms of at least one of this elements.
There about 118 elements and all arranged in a row and colomn of the periodic table .This elements of the periodic table are arranged by their atomic number, which helps with the chemical properties. Example of elements are; Hydrogen, Oxygeñ, carbon.
Therefore, among the option only carbon is an element because it cannot be broken down into smaller unit unlike water which is made up of oxygen and hydrogen. Also salt is a compound containing more elements.
Answer:
Speed of the bicyclist when going to city = 14 miles per hour.
Speed while return trip = 8 miles per hour.
Explanation:
Let the speed of the bicyclist when going to city = x miles per hour.
Speed while return trip = x - 6 miles per hour.
Total time taken = 11 hrs = Time for the trip to city + time taken for return trip.
Also, Time = Distance / Time.
So,
56 / x + 56 / ( x -6) = 11
11x² -178x + 336 = 0
Solving for x we get:
<u>Acceptable x = 14 miles per hour.</u>
<u>Speed while return trip = x - 6 miles per hour = 8 miles per hour.</u>