Which statements describe dark matter? Select two options.

It is invisible.
It is the same as dark energy.
It is well understood by scientists.
It does not emit electromagnetic radiation.
It can be observed by shifts in red and blue light.

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

What is the momentum of a 2 kg object moving at 15 meters per second