What does an astronomer mean by "the universe"

a cricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

A little girl sits in a car at a traffic light holding a helium - filled balloon. The windows are closed and the car is relatively airtight.

Explain two ways that technology has had a positive impact on the environment and two ways that it has had a negative impact on the environment.

Birds which are famous for performing a ritualized mating dance

Lexy and Jin study the diagram shown. Lexy says that the diffraction angle is the one labeled R, and Jin says that the diffraction angle is the one labeled S.

How does an iron nail become a rusty nail

What is the velocity of a bullet train that moves 400 meters west over 3 minutes anad 20 seconds?

While in empty space, an astronaut throws a ball at a velocity of 12 m/s. what will the velocity of the ball be after it has traveled 6 meters?

Which of the following statements are true? (Select all that apply.) Ammeters have a relatively high resistance and are placed in parallel with a resistor. Ammeters have a very low resistance and are placed in series with a resistor.

If a boulder has a weight of 675,000 N what is it's mass