Answer:
E. The gas absorbs 50 of energy as heat and does 50」ot work
Explanation:
This is following the law of thermodynamics that energy is neither created nor destroyed
Answer:
Explanation:
The equation for the electric field is
so filling in:
which in the end gives you
E = 7.4 × 10¹¹, choice A
Answer:
The velocity is
Explanation:
From the question we are told that
The speed of the roller coaster at ground level is
Generally we can define the roller coaster speed at ground level using the an equation of motion as
u is zero given that the roller coaster started from rest
So
So
=>
Now the displacement half way is mathematically represented as
So
Where is the velocity at the half way point
=>
=>
Answer : distance, d = 463.7 m
Explanation :
According to the given condition it can be assumed that the first echo would be heard from closest cliff. The second echo is from farther cliff and the third echo is from the reflection between the two cliffs.
Let the distance between the first cliff and the point of firing is x and y is the distance between the second cliff and the point of firing.
Then the first echo will travel 2x distance, second will travel 2y distance and third will travel 2x +2y.
So, using above data :
and
On solving :
x = 321.9 m and y = 141.8 m
Hence, total distance between two cliffs is d = 321.9 m + 141.8 m = 463.7 m