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Which international organization is primarily responsible for addressing humanitarian crises and providing development assistance?

What is the primary mechanism through which international law is enforced?

The principle of non-interference in the internal affairs of sovereign states is known as:

The potential energy of a ball on the ground is zero. If the ball is now in the bottom of a hole, its potential energy is   nonexistent. the same as it was on the surface. negative. zero.

While exploring an ancient Mayan tomb, you discover that the walls are closing in on you. By exerting 400 N of force, you are able to keep the wall from coming closer. The work you are doing on the wall is   400 J. 3920 J. unknown, because the mass of the wall is not given. zero, because the wall is not moving.

The amount of energy produced by power-generating dams is   increasing, as more of this clean, non-polluting resource is used. increasing, as more renewable resources are used. decreasing, as more energy is used but new dams are not being built. decreasing, as old dams are destroyed for environmental reasons.

Work is the rate at which you expend energy. 

  In the equation:

When water vapor condenses to a liquid   it absorbs energy from the surroundings. its temperature drops sharply. it transfers heat to the surroundings. its temperature rises slightly.

The heat needed to warm one gram of water one Celsius degree is called a   joule. calorie. Btu. kilocalorie.