I have read that it is enough energy to power the needs of civilization for an entire year.
Answer:
It's D. Momentum,
Explanation:
The Faster An Objects Goes, The Harder It Will Be To Stop.
Answer:
C) Acceleration is the change in velocity so the car is experiencing a change in velocity and it is accelerating.
Explanation:
- Velocity is a vector quantity, which consists of a magnitude (the speed) and a direction. In the case of the circular motion, as in this problem, the speed is constant (45 m/h), but the direction is constantly changing, so the velocity is changing as well.
- Acceleration is also a vector quantity, whose magnitude is equal to the rate of change of the velocity, and the direction is given by the change in direction of the velocity. Therefore, since the velocity is changing, the acceleration in this problem is changing as well.
Answer:
Here not any option is matching but only (A) option is near to our answer.
The frictional force is 126.046 N
Explanation:
Given:
Mass of bullet
kg
Thickness of sand bag
m
Initial bullet velocity ![v_{i} = 55 \frac{m}{s}](https://tex.z-dn.net/?f=v_%7Bi%7D%20%3D%2055%20%5Cfrac%7Bm%7D%7Bs%7D)
Final bullet velocity ![v_{f} = 18 \frac{m}{s}](https://tex.z-dn.net/?f=v_%7Bf%7D%20%3D%2018%20%5Cfrac%7Bm%7D%7Bs%7D)
According to the work energy theorem,
Work done by friction force is equal to change in kinetic energy.
![\frac{1}{2} m v_{i} ^{2} - \frac{1}{2} m v_{f } ^{2} = f_{s} d](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20m%20v_%7Bi%7D%20%5E%7B2%7D%20%20%20-%20%5Cfrac%7B1%7D%7B2%7D%20m%20v_%7Bf%20%7D%20%5E%7B2%7D%20%20%3D%20f_%7Bs%7D%20d)
Here we have to find friction force ![f_{s}](https://tex.z-dn.net/?f=f_%7Bs%7D)
![\frac{1}{2} \times 0.028 (3025-324) = f_{s} \times 0.30](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20%20%5Ctimes%200.028%20%283025-324%29%20%3D%20f_%7Bs%7D%20%5Ctimes%200.30)
N
Here not any option is matching but only (A) option is near to our answer.
Therefore, the frictional force is 126.046 N