Answer:
D. It has been demonstrated to be without exception under certain stated conditions.
Explanation:
A principle is simply a proposition based on some results from some experiments. A principle becomes a law when it gains strength. That is when other scientists support and back it.
A scientific law is a statement that describes a natural phenomenon and is not contradicted by repeated experiments over the time.
Sir Isaac Newton's law of gravitation stated "A gravitational force exists between all objects in the universe. This force is directly proportional to the masses of the two objects and inversely proportional to the distance between them."
His law explained that every body in the universe attracts every other body. It explained that it is not just Earth that pulls us towards it. But even sun and moon has their own gravitational pull and so does all other objects. It is just that the Gravitational pull of some objects is negligible.
Newton's law of Gravitation is considered a universal law because it is applicable to almost all the bodies in the universe and is demonstrated to be correct for them under certain conditions.
Answer:
i. 15.6 m/s
ii. I = 1.44 KNs
Explanation:
The impulse, I, on a body is the product of force applied on it and the time it acts.
i.e I = F x t
Impulse is sometimes expressed as the change in momentum of a body. It is measured in Ns.
i. mass, m, of the player = 92 kg
initial velocity of the player, u = 9.4 m/s
final velocity of the player, v = 6.2 m/s
Since he bounces back on hitting the pole, then the sign of initial and final velocities are of opposite sign.
So that,
change in velocity of the player = final velocity - initial velocity
= 6.2 - (-9.4)
= 6.2 + 9.4
= 15.6 m/s
change in velocity of the player is 15.6 m/s
ii. Impulse, I = m(v - u)
= 92 x 15.6
= 1435.2
Impulse on the player is 1.44 KNs.
Answer:
Speed, v = 312.34 m/s
Explanation:
The equation that describes a transverse wave on the string is given by :
![y=0.0120\ msin[(927\ rad/s)t-(3\ rad/m)x]](https://tex.z-dn.net/?f=y%3D0.0120%5C%20msin%5B%28927%5C%20rad%2Fs%29t-%283%5C%20rad%2Fm%29x%5D)
..............(1)
Where
y = displacement of a string particle
x = position of the particle on the string
The wave is travelling in the +x direction. We have to find the speed of the wave.
The general equation of traverse wave is given by :
................(2)
On comparing equation (1) and (2) we get,
k = 3 rad/m
Since, 
..............(3)
Also, 
Since, 
...............(4)
Speed of the wave is the product of frequency and wavelength i.e.
Using equation (3) and (4), the speed of the wave can be calculated as :
v = 312.34 m/s
Hence, the speed of the transverse wave is 312.34 m/s
Answer: b) pointed toward and parallel to the member.
Explanation:
It is shown in the picture attached
Answer:
Explanation:
Potential across the electrochemical cell, V = 2 V
Current, I = 1 A
Time, t = 1000 s
Let n electrons move from the anode to the cathode. We know that electric current is calculated as :
Also, q = ne
So, 
electrons move from the anode to the cathode in 1000 seconds.
