A person standing on Earth drops a ball. At the same time, a person standing at the bottom of a spaceship accelerating at 9.8 m/s2, in the absence of any significant fields in deep space, drops a ball. What would these people observe? Please help!

An object is located 30.0 cm from a concave mirror. the focal length is 15.0 c,. what is the image distance? a. 30.0 cm b. -10 cm c. 10.0 cm d. -30.0 cm

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

An object in mechanical equilibrium is an object