A pulley is another sort of basic machine in the lever family. We may have utilized a pulley to lift things, for example, a banner on a flagpole.
<u>Explanation:</u>
The point in a fixed pulley resembles the support of a lever. The remainder of the pulley behaves like the fixed arm of a first-class lever, since it rotates around a point. The distance from the fulcrum is the equivalent on the two sides of a fixed pulley. A fixed pulley has a mechanical advantage of one. Hence, a fixed pulley doesn't increase the force.
It essentially alters the direction of the force. A moveable pulley or a mix of pulleys can deliver a mechanical advantage of more than one. Moveable pulleys are appended to the item being moved. Fixed and moveable pulleys can be consolidated into a solitary unit to create a greater mechanical advantage.
Answer:
A. A person would have the same mass, but weigh less.
Explanation:
Remember, even if you weigh less because of a change in gravity's force on your body, your body's mass is still the same.
It is given that the height of the tower is
The uncertainty the measurement of this height is
Drop time is measured as:
The uncertainty in measurement of time is:
Using the equation of motion: 
where, 
is the distance covered, 
is the initial velocity, 
is the acceleration and 
is the time.
(because canon ball is in free fall). we need to calculate the value of a=g.
The uncertainty in this value is given by:
Substitute the values:
Explanation:
The given data is as follows.
Charge (q) = 2 coulomb, Force (F) = 60 N
Now, it is known that the relation between electric field, force and charge is as follows.
Magnitude of electric field (E) = 
Hence, putting the given values into the above formula as follows.
Electric field (E) =
= 
= 30 N/C
Thus, we can conclude that the magnitude of the electric field at the place where the charge is located is 30 N/C.
