It's Photoelectric Effect, I just a test with this same question. I am not good for explaining exactly how, but I was right.
The answer is D!
Let me know if you need any help
Answer:
15.8 ft/s
Explanation:
= Velocity of car A = 9 ft/s
a = Distance car A travels = 21 ft
= Velocity of car B = 13 ft/s
b = Distance car B travels = ft
c = Distance between A and B after 4 seconds = √(a²+b²) = √(21²+28²) = √1225 ft
From Pythagoras theorem
a²+b² = c²
Now, differentiating with respect to time
∴ Rate at which distance between the cars is increasing three hours later is 15.8 ft/s
Answer:
PH scale
Explanation:
PH scale helps measure the acidity or the basisity of a solution where 7 is neutral solutions, above 7 is basic solutions, below 7 is acidic solutions.
Answer:
heeyya it is the second paragraph