What type of substance is a catalyst?

A. always a gas

B. always a liquid

C. always a powder

D. A catalyst can be in many forms.

What are some self care strategies that we can use to deal with everyday feelings? What does Sasha do? Does it work?

When you lift a book of the ground to your desk, what kind of work do you do, negative or positive? by lifting the book what do you change? does the book gain or loose energy? what kind of energy?

Give an example of how friction can be used and an example of how friction can be harmful

Two objects (38.0 and 17.0 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find (a) the acceleration of the objects and (b) the tension in the string.

Julie is cycling at a speed of 3.4 meters/second. If the combined mass of the bicycle and Julie is 30 kilograms, what is the kinetic energy? A. 1.7 * 102 joules B. 1.5 * 102 joules C. 2.0 * 102 joules D. 2.2 * 102 joules

A 15.7-g aluminum block is warmed to 53.2 °c and plunged into an insulated beaker containing 32.5 g of water initially at 24.5 °c. the aluminum and the water are allowed to come to thermal equilibrium.

Recombination of white light can be done through glass slab

Which part of a farm system is directly improved by the use of fossil-fuel-based fertilizers? A. air quality B. water purity C. soil temperature D. nutrients and minerals

If the momentum of a 1000 kg car travelling at 10 m/s was transferred completely to a 20.0 kg traffic barrier, what would the final speed of the barrier be a. 40 m/s b. 50 m/s c. 250 m/s d. 500 m/s

2. A cannonball is fired at an angle 0 = 35° to the horizontal, with a velocity of 85 ms 1. a) What is the maximum vertical height reached by the cannonball? b) What is the maximum horizontal range of the cannonball?