Which would you expect to have the greatest amount of friction?

a - a smooth surface on a smooth surface

b-a smooth surface on a rough surface

c-a rough surface and air

d-a rough surface on a rough surface

Why do political parties switch to national conventions to nominate presidential candidates

Force of 99N and 64N act on an object of mass27 kg. what is the acceleration of the object

When you set something down on the ground what kind of work are your arms doing

An object with a mass of 2.0 kg accelerates 2.0 m/s2 when an unknown force is applied to it. What is the amount of the force?

As water begins to boil in a kettle the hotter water at the bottom of the kettle closest to the stove begins to rise and the cooler water above sinks and warms. Why does this occur?

Which of these atoms is most likely to share electrons with other atoms?

A rapidly moving cold air mass meets a slowly moving warm air mass and forms a front. what will most likely occur at this front?

It is believed that during the late Cretaceous period sea levels rose drastically resulting in about a third of the Earth's present land masses being underwater. Which of the following types of evidence supports this theory? A.

On a drive from one city to? another, victor averaged 39 mph. if he had been able to average 72? mph, he would have reached his destination 11 hrs earlier. what is the driving distance between one city and the? other?

A motorcycle has a constant speed of 24.3 m/s as it passes over the top of a hill whose radius of curvature is 182 m. The mass of the motorcycle and driver is 391 kg.