Extremely high temperatures and pressures are necessary for fusion reactions to take place in stars. true or false.

The slope of a position versus time graph represents the object's A. acceleration B. displacement C. position D. velocity

Beryllium-8 is an unstable isotope and decays into two α particles, which are helium nuclei with mass 6.68*10-27kg. This decay process releases 1.5*10-14J of energy.

10. A cruise ship travels directly toward the dock at a speed of 12 m/s. A passenger walks 2 m/s in the same direction as the ship travels. After three seconds, the distance from the passenger to the dock has decreased by -

Which of the following types of stars are dim but can have high surface temperatures? A.) Giants B.) Main sequence stars C.) Supergiants D.) Dwarfs

Uranus is most similar in size and composition to A) Mars B) Earth C) Jupiter D) Neptune

An object has a mass of 8.00 kg. What is the gravitational force on the object by the earth?

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova