When Emmett is lifting a box
vertically, the forces that must be added to calculate the total force are: the
gravitational force, tension force(the force exerted by Emmett to the box and
the force exerted by the box to Emmett), and air resistance force.
Weight = mass * gravity = 60 kg * 3.75 m/s² = 225 N
<span>Option D.</span>
(a) The mass of one proton is
. Each bag has a mass of M=1.0 g=0.001 kg, so the number of protons in each bag is
(b) The distance between the two bags is twice the Earth's radius:
The gravitational attraction between the two bags is given by
To calculate the electrostatic repulsion, we should first calculate the total charge of each bag, which is the charge of one proton times the number of protons:
And now we can calculate the electrostatic repulsion between the two bags:
(c) we can easily see from point (b) that the gravitational attraction between the two bags is very tiny, so it cannot be felt. Instead, the electrostatic repulsion between the two bags is a very large number, so this can be felt.
1) The electric field between the two plates is
. The potential difference between the plates is given by
where d is the separation between the plates. By using
we find
2) The work done by the electric field to move the electron by that distance is equal to the variation of electric potential energy of the electron:
where e is the electron charge. By substituting numbers, we find
acceleration due to gravity on surface of earth is given as
now at the surface of earth we know its value will be g = 9.8 m/s^2
it is given that we need to find the weight at height three earth radii above the surface
so we can say
now from above equation we can say that here the acceleration due to gravity is 1/16 times of the gravity at surface
So as we know that the weight is measured as
if gravity is decreased by 1/16 times then weight will also decrease by the same factor
So weight will be measured as
So its weight above the surface will 5.625 lb at that height