A car travels along a straight road at a steady 40 MPH. Are the forces on the car balanced or unbalanced? Explain.

What is the difference between the charges on a balloon rubbed in your hair and a glass rod rubbed with silk? why?

Which of the following quantities are zero for an object traveling in a circle at a constant speed? There may be more than one correct answer.

What is big and green with horns and jumps high?

What did Ernest Rutherford expect to happen when he aimed a beam of particles at a thin gold foil?

Six light bulbs are connected in series with a 9.0 volt battery. What is the voltage across each bulb?

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.

An object's weight is equal to its buoyant force in water. What would you expect to happen when the object is placed in water? Explain your reasoning.