Why is gravity considered a force?

if two gliders of equal mass m and equal and opposite initial velocity v collide perfectly elastically, using both the momentum and energy conservation equations from equation (71), what is the initial kinetic energy and what is the final kinetic

If you are swimming upstream (i. e., against the current), at what speed does your friend on the shore see you moving?

A faulty model rocket moves in the xy-plane (the positive y direction is vertically upward). The rocket's acceleration has components ax (t) = αt2 and ay (t) = β - γt, where α = 2.50 m/s4, β = 9.00 m/s2, and γ = 1.40 m/s3.

The sun, sol, is a g-class main sequence star. what is the approximate temperature of the sun's surface

Is light: kinetic, potential energy, either or both? Explain

Which process causes wells on land to become saline, making them unusable for drinking water? A. Erosion B. Echo sounding C. Eutrophication D. Groundwater infiltration

A farmer uses a tractor to pull a 150 kg bale of hay up a 15∘ incline to the barn at a steady 5.0 km/h. The coefficient of kinetic friction between the bale and the ramp is 0.40. Part A What is the tractor's power output?

Identify the conditions for an elastic collision in a closed system. Check all that apply. Energy is conserved. Velocities may change. Momentum is conserved. Kinetic energy is conserved. Objects stick together after the elastic collision.

When the velocity of a mass on a spring is zero, the acceleration is at

Which is a disadvantage of using wind as an energy source? Check all that apply. It may be unreliable. It is not naturally occurring. It produces a lot of waste. It requires wires to carry electricity. It generates large amounts of electricity.