Part 1: Assume that the North American continent can be represented by a slab of rock 4400 km on a side and 29 km deep and that the rock has an average mass density of 2900 kg/m³. The continent is moving at the rate of about 4.2 cm/year. What is the mass of the continent?
Answer in units of kg.

Part 2: What is the kinetic energy of the continent?
Answer in units of J.

Part 3: A jogger (of mass 73 kg) has the same kinetic energy as that of the continent. What would his speed be?
Answer in units of m/s.

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.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

it would stay the same