Gravity. It pulls rock down
Answer: Physical change is a change in which there is no change in chemical composition of the substance.
For example, when we freeze liquid water then it changes into solid, that is, only physical state of water has changed and no change in chemical composition.
Therefore, in a physical change there is change only in the arrangement, energy and movement of particles.
Explanation:
Explanation:
It is given that,
A car travels 25 m/s forward for 10 s.
Solution,
For a vector, a quantity must have both magnitude as well as the direction. For a scalar, a quantity have only the magnitude. In this case, the car moves in forward direction. This is the only difference between the vector and the scalar.
Out of given option,s the correct option is (c) "The measurement 25 m/s is the only vector quantity because it is a measurement of speed".
Newton's first law of motion is an object in motion stays in motion until acted upon by another force. Driving at 30 mph in a car is going to stay constant until you crash the car into a wall, stopping the car.
Answer:
![I_t=4.95\ kg.m^2](https://tex.z-dn.net/?f=I_t%3D4.95%5C%20kg.m%5E2)
Explanation:
Given that
L = 3 m
M = 2.4 kg
m=0.7 kg
r= L/2 = 1.5 m
The moment of inertia of rod about it center
![I=\dfrac{ML^2}{12}](https://tex.z-dn.net/?f=I%3D%5Cdfrac%7BML%5E2%7D%7B12%7D)
The moment of inertia of point mass about center of rod
I'= mr² + mr²
So total moment of inertia
![I_t=\dfrac{ML^2}{12}+2mr^2](https://tex.z-dn.net/?f=I_t%3D%5Cdfrac%7BML%5E2%7D%7B12%7D%2B2mr%5E2)
By putting the values
![I_t=\dfrac{ML^2}{12}+2mr^2](https://tex.z-dn.net/?f=I_t%3D%5Cdfrac%7BML%5E2%7D%7B12%7D%2B2mr%5E2)
![I_t=\dfrac{2.4\times 3^2}{12}+2\times 0.7\times 1.5^2](https://tex.z-dn.net/?f=I_t%3D%5Cdfrac%7B2.4%5Ctimes%203%5E2%7D%7B12%7D%2B2%5Ctimes%200.7%5Ctimes%201.5%5E2)
![I_t=4.95\ kg.m^2](https://tex.z-dn.net/?f=I_t%3D4.95%5C%20kg.m%5E2)