Answer:
(1) The orbits are ellipses, with focal points ƒ1 and ƒ2 for the first planet and ƒ1 and ƒ3 for the second planet. The Sun is placed in focal point ƒ1.
(2) The two shaded sectors A1 and A2 have the same surface area and the time for planet 1 to cover segment A1 is equal to the time to cover segment A2.
(3) The total orbit times for planet 1 and planet 2 have a ratio a13/2 : a23/2
The ancient astronomers think areas of the moon called mares might be Seas.
Option D
<u>Explanation</u>:
The surface area of Earth's moon is dark, large, and is basaltic plains which are formed by ancient volcanic eruptions. They were dubbed as Maria, "ancient astronomers" who misunderstood them as actual seas. They are less reflective than highlands. Due to their iron-rich composition, they tend to appear dark from the naked eye. The Maria cover approximately about 16% of surface mostly on side that is visible from Earth. The few Maria on side that is too far are much smaller and residing mostly in very large craters. The ancient astronomers mistook the surface area as look like actual seas.
Answer:
Set transponder to code 7600, continue flight on assigned route and fly at the last assigned altitude or the MEA, whichever is higher.
Explanation:
Answer:
Explanation:
45 mi /h = 45 x 1.6 x 1000 / (60 x 60) m /s
= 20 m /s
Maximum frictional force possible on wet road
= μs x mg where μs is coefficient of static friction and m is mass of body
Applying work energy theorem
work done by friction = kinetic energy of truck
μs x mg x d = 1/2 m v ² where v is velocity of body and d is stopping distance
2xμs x g x d = v²
2 x .105 x 9.8 x d = 20 x 20
d = 194.36 m
b )
In this case
μs = 0.602
Inserting this value in the relation above
2xμs x g x d = v²
2 x .602 x 9.8 x d = 20 x 20
d = 33.9 m .
