Which of the following is a sign that a chemical change has taken place when wood burns?

bubbles

rust

production of a liquid

production of heat

Which statement best compares an asteroid with Earth?

While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the speed of the tennis ball is km/h.

Which of the following are NOT properties of bases? Check all that apply. A. Reacts with certain metals B. Slippery C. Tastes Bitter D. Reacts with baking soda to produce carbon dioxide

A piano tuner uses a tuner to create a tone of 5.00 x 10² Hz. When a key on the piano is struck he hears 5 beats per second. What is a possible frequency of vibration for the piano string? 2500 hz 1300 hz 605 hz 495 hz

Is oil from diesel a nonrenewable resource or a renewable resource?

Are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all? a. A girder is lifted at constant speed by a crane. b. A girder is lowered by a crane. It is slowing down. c.

What kind of friction is shown between the skydiver and the air?

When charging an object by conduction, what happens to the charges in the object? A. Electrons move, giving the object a static charge. B. The object is forced to generate extra electrons because of the electric field. C.

If an atom has 5 protons and 6 electrons it's charge

N object moves in a circular path at a constant speed. what is the relationship between the directions of the object's velocity and acceleration vectors?