Johnny was playing baseball with his friends and they noticed a bolt of lightning. They heard thunder seven seconds later. How f
2 answers:
Answer:
2380m
Explanation:
Given parameters:
Time taken to hear the sound after lightning = 7s
Unknown:
Distance of the storm = ?
Solution:
Light has been shown to travel faster than sound. To solve this problem,
Speed =
Speed is the rate of change of distance with time
Distance = speed x time taken
The speed of sound is given as 340m/s
Distance = 340 x 7 = 2380m
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<u>Answer:</u>
Velocity of rock after 2 seconds = 6.56 m/s
<u>Explanation:</u>
We have equation of motion , , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
Here height of rock in meters, h =
Comparing both the equations
We will get initial velocity = 14 m/s(already given) and
So, Acceleration, a = -3.72
Now we have equation of motion, v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.
When time is 2 seconds we need to find final velocity.
v = 14 - 3.72 * 2 = 6.56 m/s.
So, Velocity of rock after 2 seconds = 6.56 m/s
Answer:
F = - 59.375 N
Explanation:
GIVEN DATA:
Initial velocity = 11 m/s
final velocity = 1.5 m/s
let force be F
work done = mass* F = 4*F
we know that
Change in kinetic energy = work done
kinetic energy =
kinetic energy = = -237.5 kg m/s2
-237.5 = 4*F
F = - 59.375 N