Urgent what does newton's third law say about why momentum is conserved in collisions?

1. unequal forces act for unequal times, so the change in momentum for both objects must be unequal.

2. equal forces act in equal times, so the change in momentum for both objects must be equal.

3. equal forces act for unequal times, so the change in momentum for both objects must be equal.

4. unequal forces act for unequal times, so the change in momentum for both objects must be equal.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

How can you increase the strength of an electromagnet?