What features should you look for in a crash helmet, and why?

Two very small planets orbit a much larger star. Planet A orbits the star with a period TA. Planet B orbits the star at four times the distance of planet A, but planet B is four times as massive as planet A.

Define secondary colors of light

A plane can fly 3952 kilometers in 3 hours. If the plane flies in cloudy skies, it can fly 184 less kilometers than usual within the same time. What is the speed for the plane flies in cloudy skies?

Suppose you are holding a basketball while standing still on a skateboard you are and the skateboard have a mass of 50 kg you throw the basketball with a force of 10 N what is your acceleration before and after you throw the ball

A car travels south on a highway for two hours at 90 km/hr. the car then reverses and drives for three hours at 70 km/hr. what is the car's change in position relative to where it started?

What role do convection currents play in oceans and the atmosphere?

What causes density currents to form in the mediterranean sea? a. condensation b. evaporation c. transpiration d. upwelling

How long does it take a car to travel 450 km at 75 km/hr

A free-falling golf ball strikes the ground and exerts a force on it

What are the main activities involved in studying physics?