Why reaction force must exist

A 1500 kg car is moving 18 m/s how much force is required to bring the car to a stop in 12 seconds

One student did an experiment on the rock cycle. The steps of the experiment are shown below. Collect five pieces of wax of different colors. Use a plastic knife to scrape off thin shavings of the pieces of wax.

Which has the greater momentum, 0.1-kg object moving at 2,000 m/sec. or a 100 kg object moving at 3 m/sec.?

According to aristotle what kind of motion requires no force

Which of the following best explains why electrical wires are usually covered with plastic or rubber

Forgetting takes place only in short-term memory.

What is the simplest relationship between the angular wavenumber k and just one of the other kinematic variables? Express your answer using only one of the other kinematic variables plus constants like π.

The pilot of an airplane notes that the compass indicates heading west. The airplane's speed relative to the air is 100 km/h. The air is moving in a wind at 25.0 km/h toward the north.

How do you get a resultant factor? A. Add two or more vectors B. Add two scalars C. Multiply two scalars D. Multiply two vectors

A panpipe is made of five pipes. The longest pipe is 25 centimeters long and the shortest is 5 centimeters long. Which of these pipe produces the highest-frequency sound and why?