A bag is dropped from a hovering helicopter. When the bag has fallen 2 seconds,

a. What is the bag's velocity?

b. How far has the bag fallen?

The mass of a rocket decreases as it burns through its fuel. If the rocket engine produces constant force (thrust), how does the acceleration of the rocket change over time? Answers: - it does not chage - it increases - it decreases

Why do heavier objects fall at the same speed as lighter ones?

When applying the process of science which of theseis tested 1. a question, 2. an observation, 3. a conclusion, 4. a prediction

Thunderstorms are often produced ahead of this type of front

If you were to combine acid and base solutions, what products do you think would be produced?

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?