Which feature signifies to astronomers that a distant star is part of a planetary system

An atom's mass number equals the number of

What does a lunar eclipse and a solar eclipse have in common

A block of mass 3 kg slides down an inclined plane inclined at 30° with respect to horizontal. The frictional force between the block and the plane is 8.7 N and the length of the plane is 1 m.

Which of these statements best describes an effect of changes in Earth's magnetic field? A) Southern lights are seen at high altitude places like Alaska. B) Northern lights are seen at low latitude places like Michigan.

A 2,300-kg truck is traveling down a highway at 32 m/s. What is the kinetic energy of the truck? A. 1,200 J B. 37,000 J C. 1,200,000 J D. 37 J

Which statement about how light travels is true? A Light waves need a medium to travel, and they travel at the same speed even if the light source is moving.

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N

4. A helicopter is flying at a height of 1.5km. If it has 50MJ of G. P. E., what is the mass of the helicopter?

Unless otherwise posted, what is the speed limit in a school zone? florida

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?