What essential characteristic does a good experiment have? a. a control group is given the experimental treatment. b. a single variable is tested. c. a control is used. d. both b and c

Which characteristics describe a spiral galaxy? Check all that apply. is shaped like a pinwheel has no new star formation contains a lot of gas and dust is smaller than other types of galaxies has sites of active star formation within its arms

Calculate the force of gravity between two obejcts of masses 1300kg and 7800kg which are 0.23 apart

The plane flight covers 400 miles in the first hour. As you approach the landing site, it takes you an hour to cover the last 200 miles. This is an example of Positive Acceleration Velocity Instantaneous Speed Negative Acceleration

Which statement describes the function of control rods? They release neutrons during fission reactions. They undergo nuclear fission reactions. They control the rate of reactions. They directly convert water to steam.

Intermolecular forces between molecules of a substance are strongest when the substance is a

Which of the following determine an object's velocity? A. speed and direction B. direction and acceleration C. speed and mass D. speed, direction, and acceleration

The following statements regarding the exhaust gas recirculation (EGR) valve are all correct except: Low restriction exhaust systems will have no effect on EGR system operation. B.

A 10.0 V battery is connected to a 120-ohm resistor. Ignoring the internal resistance of the battery Calculate the power delivered to the resistor.

Hemoglobin (Hb) is the O2-carrying protein in our blood. Unlike myoglobin, it has four sites allowing it to bind up to four O2 molecules.

Why does the moon appear to change shape? A: It rotates and makes it own light B: It moves closer and farther away from the earth in a yearly pattern. C: It reflects sunlight as it revolves around the earth.