All reactions require activation energy.

a. True

b. False

Which of the following creates a longitudinal wave? A. striking a gong B. turning on a flashlight C. shaking a rope up and down D. dropping a stone into a pond

7. A bullet of mass 10g strikes a ballistic pendulum of mass 2kg. The center of mass of the pendulum rises a vertical distance of 12cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

What force is most responsible for the path of an object during projectile motion?

What is the approximate weight of a 20-kg cannonball on Earth? 2 N 20 N 196 N 1,960 N

A heater gives off heat at a rate of 330 kj/min. what is the rate of heat output in kilocalories per hour? (1 cal 4.184 j)

When is the average velocity equal to the instantaneous velocity

Tightening a screw with a larger spacing between its threads requires fewer turns of a screwdriver than tightening a screw with smaller thread spacing. What is a disadvantage of the screw with larger thread spacing?

The role of plants in the water, oxygen, nitrogen, and carbon cycles

As pitch gets higher, wavelength gets?

What term is used to describe the 4 in the expression 4 Ca (NO³) ²