Answer:
The focal length fe of the eyepiece is <em>2.86 cm</em>
Explanation:
Since we are given the telescope's magnification and the length of the tube, we can use the expressions
<em>M = f_o/fe (1)</em> and
<em>l = f_o + fe (2)</em>
where
- M is the telescope's magnification
- l is the length of the tube
- fe is the focal length of the eye-piece
Rearranging equation (2) to make f_o the subject of the formula, we get
<em>f_o = l - fe</em>
Substituting the above equation into equation (1) we get
<em>M = (l - fe)/fe ⇒ fe = l/(M +1)</em>
<em> ⇒ fe = 60/(20 + 1)</em>
⇒ <em>fe = 2.86 cm</em>
Answer:
1000kg
Explanation:
F=MA
Rearrange the formula: M=F/A
plug in values for F (force), and A (acceleration).
M=4000/4
M=1000kg
i think.
not sure tho.
Answer:
D. near an ocean coastline
Explanation:
The magnetic needle of a compass can be deviated by the magnetic field that the ocean has, this is important to remember because eventhough it´s not a big difference but it is significant enough to keep it in mind. Ocean can attract the magnetic needle of the compass and create a deviation on it.
B sunlight, because the sun has energy and that gives the soil energy and the plant take that energy and is able to grow.
Answer:
Friction force to the right
Explanation:
Since we know that when car is taking sharp left turn then our tendency of motion is along the car
So we also have tendency to take turn towards left
Since we know that friction force always oppose the tendency of relative motion between two surface
so the friction force between car and us will oppose the relative motion and it will act opposite to it
So the friction force will be towards right due to which the person inside the car will slide towards right
so correct answer will be
Friction force to the right