Which will speed up a chemical reaction?

A.

Apply heat.

B.

Increase the concentration of the reactants.

C.

Grind up the substance, so there is more surface area.

D.

all of the above

A flat slab of styrofoam, with a density of 32 kg/m3, floats on a lake. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution.

The basic life function of an organism are carried on by A) cells B) nutrients C) atoms D) harmones

A 2 kg ball rolls off a 27 m high cliff, and lands 25 m from the base of the cliff. Express the displacement and the gravitational force in terms of vectors and calculate the work done by the gravitational force.

Does sound move as a longitudinal or transverse wave in a medium?

What kind of wave is created if a tree falls in a forest?

When you are ice skating, to get started, you push your skate backwards on the ice and, as a result, begin to move forward. Which law of motion is being described in this scenario?

A small car collides with a large truck. Is the magnitude of the force experienced by the car greater than, less than, or equal to the magnitude of the force experienced by the truck? a. less than b. equal to c. greater than

As an airplane is taking off at an airport its position is closely monitored by radar. The following three positions are measured with their corresponding times: x1 = 241.22 m at t1 = 3.70 s, x2 = 297.60 m at t2 = 4.20 s, x3 = 360.23 m at t3 = 4.

A stunt car with a mass of 1000 kg crashes into a tree on a movie set during the collision acceleration of the car with 3 m what was the force of impact of the collision on the car

A circuit with a current of 400 amp has several lights that have a total resistance equal to 30 ohms. Find the voltage.