Answer:
quizlet would help trust it really doess!!
The average weight of an athlete should be around 60kg so from the information that the athlete can run 100m in 10s, we can calculate that their average speed is 10m/s. Using the kinetic energy formula, Ek = 1/2mv^2 we can calculate the kinetic energy using 60kg as the mass.
(1/2)(60)(10^2) = Ek
Ek= 3000J
Answer:
It is worth noting that the higher the gravitational energy of an object moving downwards, the lower the kinetic energy, and the lower the kinetic energy of an object moving upwards, the higher its gravitational energy.
Gravitational potential energy is acquired by an object when it has been moved against a gravitational field. For example, an object raised above the surface of the Earth will gain energy, which is released if the object is allowed to fall back to the ground.
Answer:
A
Explanation:
Today there are three major deep ocean masses. North Atlantic Deep Water or NADW is mainly produced where the surface ocean is cooled in the Norwegian Sea in the northern part of the North Atlantic on the north side of a ridge that runs between Greenland, Iceland, and Scotland.
Answer:
Time spent = 1.88 sec.
Explanation:
This is a case of doppler shift of a moving source and a stationary receiver.
f' = cf/(c - u)
Where f' is the apparent frequency = 903 + 51.3 = 954.3 Hz
c = speed of sound = 342 m/s
f = real frequency = 903 Hz
u = speed of sound source = ?
Solving for u we have
954.3 = (342 x 903)/(342 - u)
954.3 = 308826/(342 - u)
326370.6 - 954.3u = 308826
-954.3u = 308826 - 326370.6
-954.3u = -17544.6
u = 18.38 m/s
Using u = u° + gt
Where u = velocity of your friend at that instance = 18.38 m/s
u° = your friend's initial velocity = 0 (your friend started falling from rest)
g = acceleration due to gravity 9.8 m/s^2
t = time spent in the air by your friend.
18.38 = 0 + 9.8t
t = 18.38/9.8 = 1.88 sec.