At t=0, a constant force of 10 N is applied to a body of mass 5 kg starting at rest in outer space where there are no other forces. What is the power (in Watts) that the force delivers at t = 2 s?

20 W.

Explanation:

Power is defined as the time rate oc change at which work is done.

Mathematically,

Power, P = workdone/time

Given:

vi = 0 m/s

F = 10 N

m = 5 kg

t = 2 s

F = ma

a = 10/5

= 2 m/s^2

Using equation of motion,

vf = vi + at

vf = 2 * 2

= 4 m/s

Workdone = potential energy, PE+ kinetic energy, KE

PE = 0

KE = 1/2 * m * v^2

= 1/2 * 5 * (4^2)

= 40 J

Power, P = 40/2

= 20 W.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.