Emmett is lifting a box vertically. which forces are necessary for calculating the total force? . a. fp, ff, and fg. b.fp and fn. c. p, fg, and ff. d. fp and fg

d. Fp and Fg

Explanation:

In a context where a person is lifting an object you have to consider the vertical forces.

Fg stands for the gravitational force: the attractive force exerted by the Earth on the object in virtue of the masses and equals the mass of the object times the gravitational acceleration. This product is the weight of the object.

The other vertical force, which must counteract the weight of the object, is the upward force applied on the object. It is usual fo use the notation Fp for the pull force using a pulley system.

In this scenario the net force equals the difference Fp - Fg.

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.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it