You plan a car trip for which you want to average 90 km/h. You cover the first half of the distance at an average speed of only 48 km/h. What must your average speed be in the second half of the trip to meet your goal?

The main goal of science is to 1) Collect facts and learn "the truth" 2) Understand nature 3) Do wild and crazy experiments 4) Is to produce facts

The water table is the a. lower boundary of the zone of saturation. b. aquifer. c. zone of aeration. d. upper boundary of the zone of saturation.

Which of the following statements is true? Energy input is always greater than energy output. Magnetic fields are weakest at the poles of a magnet. Magnetic fields can push and pull protons. A change in acceleration is called velocity.

An object with a mass of 120 kilograms is moving at a velocity of 30 m/s. whats its momentum

Dark spots on the photosphere are known as A. the corona. B. the chromosphere. C. sunspots. D. solar wind.

During a medical condition screening lung capacity testing is a standard procedure. True of false

Which of the following is a unit of energy found in food? a). vitamin b) calorie c) nutrient d) water

As one goes from left to right in a period, which of the following is true? A. The number of protons decreases. B. The number of valence electrons increases. C. both A and B D. none of the above

Which of the following surfaces reflects the most light A yellow cloth B. tree trunk C aluminum foil D. Concrete sidewalk

Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom? A. nucleus B. electron C. proton D. electron cloud