What is the acceleration due to gravity near the surface of earth

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.

What best describes an impulse acting on an object? a. the net force on an object divided by b. the time of impact the velocity of an object divided by its mass c. the product of an object's mass and the time of force impact d.

The most abundant gas in the Earth's atmosphere is: a. oxygen b. carbon dioxide c. hydrogen d. nitrogen

How far can you go until you reach space?

a mass is measured as 6.2kg in one experiment and as 6.20kg in another. in what way do these two measurements differ?

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

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction