The 5th blank line is plants and the 6th blank line is environment. The rest I don't know either.
Answer:
Answer E is false because the two instruments see the flickering of the stars, so this is not a characteristic of a reflector
Explanation:
Let's analyze the characteristics of a reflecting telescope.
- use reflection to create images
- does not have the chromatic aberration problem
Let's see the responses a, b, c and d are characteristics of a refractor
Answestars, so this is not a characteristic of a reflector
Answer E is false because the two instruments see the flickering of the stars, so this is not a characteristic of a reflector
<span>For us to know the mass of ball 2, we will be
using the law of momentum conservation which is the momentum before collision
and the momentum after collision (m1</span><span>v1</span>+<span><span>m2</span><span>v2</span>=</span><span><span>m1</span><span>v1</span>+</span><span><span>m2</span><span>v2</span></span>):
(10×20<span>) + (</span>m<span>×−</span>20<span>) = (</span>10<span>×−</span>40<span>) + (</span>m×0)
<span>200 </span>− 20m <span>= −</span>400
<span>Since we are looking for “m” which is the mass of
ball 2, derivation will be needed.
Then:</span>
m <span>= (−</span>400−200<span>) / (−</span>20<span>) = </span>30<span>kg</span>
<span>Therefore, it is concluded
that the mas for ball 2 is 30kg.</span>
Time taken by the sound to come from bell to Elwin
here we know that
d = 50 m
v = 330 m/s
now from above equation we have
now since we know that total time taken to hear the sound is 4.50s
so here we will have time to reach the rock to the bell is
now we know that distance of the bell is 50 m
so speed of the rock is given as