A pulley system has an mechanical advantage of 10. If a mover used this pulley to lift a piano with a force of 1500 N a distance of 4 m, how much force must the mover use?

(a) 145 N
(B) 40 N
(c) 10 ropes
Explanation:
Mechanical advantage, where and are input and output force respectively
Since MA is given as 10 and input force is 1450 N

Therefore, the mover must use a force of 145 N
(b)
Since also and the is given as 4 m then

(c)
Literally, we need 10 rope segments to support the piano since we utilize the mechanical advantage

Biotechnology is science which uses biological processes in order to produce useful products or organisms with desired trait or characteristics.

It includes the manipulation of the genome of an organism.  

It helps in making products like insulin and genetically modified plants such as Bt cotton, golden rice et cetera.

However, it has many serious drawbacks as it includes the manipulation of the genome of an organism.

It can result in the development of resistant microorganism, for example, development of the superbug due to overuse of antibiotics.

Similarly, it can result in the production of toxic materials.

Thus, option d. all of the above would be the correct answer.