Answer: A
Explanation: isotopes of the same thing element have the same number of protons in the nucleus but differ in the number of neutrons.
Answer:
Relative humidity is a measure of the percentage of water vapor in the air in a particular area
The distance of the cliff from where you are is determined as 3,430 m.
<h3>Distance of the cliff</h3>
Apply the formula for echo.
v = 2d/t
where;
- v is speed of sound at 20 ⁰C = 343 m/s
- d is distance = ?
- t is time = 20 s
2d = vt
d = vt/2
d = (343 x 20)/2
d = 3430 m
Thus, the distance of the cliff from where you are is determined as 3,430 m.
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Answer:
Explanation:
(a)
From the given information:
The initial velocity
= 5 m/s
The direction of the angle θ = 30°
Therefore, the component along the x-axis = 


The component along the y-axis = 


To find the final velocity( reflected velocity)
using the same magnitude 
The angle from the x-axis can be 
= 150°
Thus, the component along the x-axis = 

The component along the y-axis = 


(b)
The velocity
can be written as in vector form.

---- (1)
The reflected velocity in vector form can be computed as:

--- (2)
The change in velocity = 


(c)
The magnitude of change in velocity = 
= 8.66 m/s