Gravity is the attraction of every body to every other body due to the masses of each body. The larger the mass, the greater the force. It also depends on the distances: the closer the bodies, the greater the force. Gravity is directed toward the center of a body, and the distance is measured from the center.
When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.
Answer:
12.4 m/s²
Explanation:
L = length of the simple pendulum = 53 cm = 0.53 m
n = Number of full swing cycles = 99.0
t = Total time taken = 128 s
T = Time period of the pendulum
g = magnitude of gravitational acceleration on the planet
Time period of the pendulum is given as
![T = \frac{t}{n}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7Bt%7D%7Bn%7D)
![T = \frac{128}{99}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7B128%7D%7B99%7D)
T = 1.3 sec
Time period of the pendulum is also given as
![T = 2\pi \sqrt{\frac{L}{g}}](https://tex.z-dn.net/?f=T%20%3D%202%5Cpi%20%5Csqrt%7B%5Cfrac%7BL%7D%7Bg%7D%7D)
![1.3 = 2(3.14) \sqrt{\frac{0.53}{g}}](https://tex.z-dn.net/?f=1.3%20%3D%202%283.14%29%20%5Csqrt%7B%5Cfrac%7B0.53%7D%7Bg%7D%7D)
g = 12.4 m/s²
Please find attached photograph for your answer.
Hope it helps.
Do comment if you have any query.
The work done by the machine is equal to the product between the force applied and the distance over which the force is applieds, so in this case:
![W=Fd=(3 N)(9 m)=27 J](https://tex.z-dn.net/?f=W%3DFd%3D%283%20N%29%289%20m%29%3D27%20J)
And the power of the machine is equal to the ratio between the work done by the machine and the time taken:
I believe the answer is x