A physics student is riding on a train traveling north. Having read about inertia, the student performs an experiment with a golf ball. He reaches over the aisle and drops the ball from rest. Instead of hitting the floor directly below the student’s hand, it hits to the north, i.e., forward of that position. Which of the following might be the cause for this to happen?

A container is filled with water and the pressure at the bottom of the container is P. Then the container is emptied halfway and topped off with oil of density 0.95 × 103 kg/m3, which floats on top of the water. What is the pressure at the bottom of the container now?

Suppose [Q]×105 J of energy are transferred to [m] kg of ice at 0 oC. The heat of fusion of water is Lf = 3.33 × 105 J/kg. The specific heat of water is c = 4186 J/(kg.K). Determine the final temperature of the liquid water in Celsius.

A small mailbag is released from a helicopter that is rising steadily at [v0] m/s. After [t] s, how far is it below the helicopter? Express your answer in meters.

A ball is thrown vertically upwards at 19.0 m/s. For its complete trip (up and back down to the starting position), its average velocity is:

After reading the articles and watching the videos in class, what do you think are the most important aspects of happiness?  Why?  Your answer should be at least 5 sentences. (Make sure you follow the paragraph structure we have discussed.)

The range of the inverse tangent function,

If you are testing the following hypothesis, which would be your control group (control treatment)? Hypothesis:  Plants that are given more sugar in their water will grow faster than those given less sugar in their water.

Which of the following identities is not a Pythagorean Identity?

The following describes a scientific investigation.    Please read the text and the answer the questions that follow.  A research scientist was studying lizards.  The scientist wanted to know if lizards would run faster or slower depending on the types of insects that they ate.  All the lizards would be the same species.  Each group of lizards received only one species of insect for all their meals.  The insects would be: crickets, mealworms, wax worms, and fruit flies.  The lizards would be fed in their housing, not while racing because you don’t want them to get sick.  The scientist made a lizard-sized racetrack which included little infrared light beams connected to a computer.  When the lizards ran down the track a computer would record their times when they went through the lights.  Which of the following would be the best hypothesis for this study?