Answer:
the maximum height reached by the marble is 11.84 m.
Explanation:
Given;
mass of the marble, m = 0.02 kg
extension of the string, x = 0.08 m
force applied to the string, F = 58 N
Apply the principle of conservation of energy;
elastic potential energy = gravitational potential energy
¹/₂fx = mgh
Therefore, the maximum height reached by the marble is 11.84 m.
Answer:
No
Explanation:
In the photoelectric effect,
The number of the electrons which are being emitted is directly proportional to the intensity of the light and is independent on the frequency of the incident radiation of the light which has the frequency greater than the threshold frequency.
Thus, on increasing the frequency of the light which is being shinned on the metal , there is no change in the electrons which are being emitted.
Answer:
65.625 m/s
Explanation:
c = Speed of light = 3×10⁸ m/s
Relative speed
Relative speed = 35.625 m/s
Velocity of speeder = Velocity of police car + Relative speed
⇒Velocity of speeder = 30 + 35.625 = 65.625 m/s
∴ Velocity of speeder is 65.625 m/s
Answer:
Explanation:
ASSUMING that the cab has ONLY kinetic energy,
(it's not sitting over a loaded spring, high on a hill, on fire)
KE = ½mv²
v = √(2KE/m)
v = √(2(18750)/2100) = √17.85714...
v = 4.225771...
v = 4.23 m/s or about 15.2 km/hr
I have two different answers. One is what the shcool most likely wants you to think and the other is the truth.
School: The waters could become more or less salty. Warm water is less dense than cold water so it will sit on top of cold water. It would very bad for plants because not all plants can live in such saltiness conditions.
Global Warming isn't a thing. It's fake, scientist have lied about it, and it's entirely false. The salt from the ocean comes from the constant bashing of ocean waves on the rocks. "Warm water is less dense than cold water so it will sit on top of cold water." is true, but that doesn't mean the oceans will be more salty if it is warmer, that just says how dense the salt and water is. it can be warmer or colder doesn't matter.
Hope it helps please let me know.
