Which of the following statements about protostars is true?

A) Protostars do not always become stars.

B) Protostars never become stars.

C) Scientists do not yet know if protostars ever become stars.

D) Protostars always become stars.

You weigh 716 newtons on Earth. You travel to a newly discovered planet, Planet X. Planet X has a mass that is 3 times that of Earth, but it also has a radius that is twice as large. What is your new weight in newtons on planet x?

A 100 kg roller coaster car is located at the top of a hill where the height is 20 m. What is the velocity when it reaches the bottom of the hill? 5.5 m/s 11.2 m/s 16.7 m/s 19.8 m/s

Scientific notation 325

What is the effect of food color in the amount of food fish eat

A bob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. What is the value of the kinetic energy gained by the bob at the ground level? A: 2.4 joules B: 5.1 joules C: 8.1 joules D: 10.0 joules

A motorist driving at 25 meters/second decelerates to 15 meters/second. The combined mass of the vehicle and the driver is 1.5 * 10³ kilograms. What is the amount of mechanical work done by the vehicle?

All forces are different each exerts a particular type of effect on an object

Witch statement about polymers is true

Two bullets have masses of 3,0 g and 6.0g, respectively. both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies

What does it mean that a form of energy might take more energy to harness than it provides? Are renewable resources always renewable, or can they become non-renewable? Why aren't renewable resources used for everything that we use energy for?