An object exerts a reaction force when it

What force is needed to accelerate 200 kg mass across a surface at 75.5 m/sec

In your own words, describe the Doppler effect. Be sure to give at least one example of the Doppler effect.

What law states that, in any process, energy is neither created nor destroyed?

Discuss the relationship between acceleration and velocity. Are these scalar or vector quantities?

Consider two planets A and B. The mass of planet B is 0.012 times the mass of planet A and its radius is 0.3 times the radius of planet A. If the acceleration due to gravity at the planet A is 10 m/s2, calculate the corresponding value at planet B.

Describe the factors that form deep currents

A comet is cruising through the solar system at a speed of 50000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time in kilometers, miles, and light years?

A gas in a closed container is heated with 12J of energy, causing the lid of the container to rise 3m with 5N of force. What is the total change in energy?

What are illuminated objects?

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?