I’m assuming the correct answer is BLUE
Electric forces is not action-by-distance. Charged particle emits a electric field radially outwards. It corresponds by the inverse-square, meaning it is 1/r^2.
Answer:
175s
Explanation:
time it takes sunlight to reach the earth in vacuum
C=light speed=299792458m/s
X=1.5x10^8km=1.5x10^11m
c=X/t
T1=X/c
T1=1.5X10^11/299792458=500.34s
time it takes sunlight to reach the earth in water:
First we calculate the speed of light in water taking into account the refractive index
Cw=299792458m/s/1.349=222233104.5m/s
T2=1.5x10^11/222233104.5m/s=675s
additional time it would take for the light to reach the earth
ΔT=T2-T1=675-500=175s
Answer:
C) Mass
Explanation:
The mass of an object divided by its volume equals the density.
Hope this helps!
Answer:
The time is 1.8s
Explanation:
The ball droped, will freely fall under gravity.
Hence we use free fall formula to calculate the time by the ball to hit the ground
![h= \frac{1}{2}g{t}^{2}](https://tex.z-dn.net/?f=h%3D%20%5Cfrac%7B1%7D%7B2%7Dg%7Bt%7D%5E%7B2%7D%20)
Where h is the height from which the ball is droped, g is the acceleration due to gravity that acted on the ball, and t is the time taken by the ball to hit the ground.
From the question,
h=16m
Also, let take
![g = 9.8m{s}^{-2}](https://tex.z-dn.net/?f=g%20%3D%209.8m%7Bs%7D%5E%7B-2%7D%20)
By substitution we obtain,
![16= \frac{1}{2}\times 9.8{t}^{2}](https://tex.z-dn.net/?f=16%3D%20%5Cfrac%7B1%7D%7B2%7D%5Ctimes%209.8%7Bt%7D%5E%7B2%7D%20)
![\implies32=9.8{t}^{2}](https://tex.z-dn.net/?f=%20%5Cimplies32%3D9.8%7Bt%7D%5E%7B2%7D%20)
Diving through by 9.8
![\frac{32}{9.8}= \frac{ 9.8{t}^{2} }{9.8}](https://tex.z-dn.net/?f=%20%5Cfrac%7B32%7D%7B9.8%7D%3D%20%5Cfrac%7B%209.8%7Bt%7D%5E%7B2%7D%20%7D%7B9.8%7D%20)
![\implies{t}^{2} =3.265](https://tex.z-dn.net/?f=%20%5Cimplies%7Bt%7D%5E%7B2%7D%20%3D3.265)
square root both sides, we obtain
![\implies t= \sqrt{3.265}](https://tex.z-dn.net/?f=%20%5Cimplies%20t%3D%20%5Csqrt%7B3.265%7D%20)
![t=1.8s](https://tex.z-dn.net/?f=t%3D1.8s)