Astudent wants to lift a 350 n bucket of water up from the bottom of a well using a wheel and axle. the wheel has a radius of 55 cm, and the axle has a radius of 15 cm. how much force will the student need to provide to the wheel to turn it and lift the bucket? 28.8 n 4242 n 1283 n 95.5 n

Answer is D - 95.5 N.

Explanation:

First calculate the ideal mechanical advantage (IMA) of the system:

IMA = R/r

IMA = 55/15

IMA = 11/3

This is the factor by which the applied force is reduced. This is how you get a mechanical advantage - you exert less force to accomplish the same thing. In this case:

350 / (11/3) = 95.5 N

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.