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

Which method would be best to seperate a mixture of oil and water?

The substances required to enable a rocket engine to fire are called: blasts. propellants. temperaments. fuels.

G 1470-kilogram truck moving with a speed of 24.0 m/s runs into the rear end of a 1110-kilogram stationary car. if the collision is completely inelastic, how much kinetic energy is lost in the collision?

A force F = 94.9 N acts at an angle α = 35◦ with respect to the horizontal on a block of mass m = 29.3 kg, which is at rest on a horizontal plane. The acceleration of gravity is 9.81 m/s 2. If the static frictional coefficient is µs = 0.

After combing the fur of a cat with a plastic comb, you find that the comb can attract an empty aluminum soft-drink can. The can, lying on its side on a wooden tabletop, rolls toward the comb.

You and your housemate have an argument over the cost of the electric bill. You want to turn off the outside porch light before going to bed each night.

Work is a product of A force and distance B force and heat energy C cause and heat energy D cause and effect

An exploration submarine should be able to descend 1200 m down in the ocean. If the ocean density is 1020 kg/m3, what is the maximum pressure on the submarine hull?

Why cooking pans don't have have metal handles?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band