Scientists estimate that by the year 2013, the world's population will reach:

A. 1 billion

B. 6 billion

C. 7 billion

D. 10 billion

A river current has a velocity of 5 km/h relative to the shore. A boat moves in the same direction as the current at 4 km/h relative to the river.

What is the optimal angle to launch a projectile so it has maximum horizontal distance?

How would you describe the movement of the distant galaxies?

A chemical reaction takes place within a test tube. After the reaction, the test tube feels warmer than it did before the reaction. The reaction was: endothermic exothermic ectothermic esothermic

With all his gear on Neil Armstrong weighed 370pounds on earth when he landed on the moon he weighed 60 pounds why?

A crane lifts a 400 N crate full of baked beans 15 m. How much work was done by the crane?

High altitude high velocity rivers of air are called

A string of 18 identical Christmas tree lights are connected in series to a 130 V source. The string dissipates 61 W. What is the equivalent resistance of the light string? Answer in units of Ω.

For each of the following (a through d), indicate which is a variable and which is a constant:a. The number of minutes in an hour. b. Systolic blood pressure. c. Freezing temperature of water in degrees Kelvin. d. Ratings of daily anxiety.

Which of the following is NOT an example of kinetic energy being converted to potential energy A) A basketball player jumping for a rebound B) Releasing a compressed spring C) Sqeezing a rubber ball D) Pulling a sled uphill