What causes interstellar dust and gas to start to contract and form a protostar?

1) the shockwave from a supernova

2) nearby black hole

3) an increase in the solar wind

4) nuclear fusion

Who has better reflexes

A certain battery can power a 100 ohm-resistance device for 4 hours. how long can the battery power a 200 ohm device?

1. What is a medulla? What do forensic scientists use this for?

The wheels of a midsize car exert a force of 2150 N on the road to accelerate the car in the forward direction. If the force of friction including air resistance is 225 N and the acceleration of the car is 1.

In which step of the scientific method is information obtained through the senses? a. drawing conclusionsb. making observationsc. analyzing datad. revising a hypothesis

A rock is thrown from a cliff and hits the ground five seconds later at a distance of 50 m from the cliff how high was a cliff

A 15.0 m long plane is inclined at 30.0 degrees. If the coefficient of friction is 0.426, what force is required to move a 40.0 kg mass from rest at the bottom on the plane to the top of the plane with a final velocity of 8.00 m/s?

In a pig-calling contest, a caller produces a sound with an intensity level of 60 db. how many such callers would be required to reach the pain level of 120 db? 2 incorrect: your answer is incorrect.

Why is the use of scientific names important in biology?

1) what is a calorie?