Two substances were mixed and there was a color change and small flames. What can you infer happened?

A physical property was observed

A chemical change occurred

A change in state from solid to liquid

Matter was destroyed

A block oscillating on a spring has period t = 3.0 s. note: you do not know values for either m or k. do not assume any particular values for them. the required analysis involves thinking about ratios.

5 things that will speed up a reaction

If you push for an hour against a stationary wall, you do no work

As a skateboarder moves downhill, some of the energy of the skateboarder is A) lost. B) kinetic. C) potential. D) kinetic and some is potential.

Determine the magnitude of the effective value of g⃗ at a latitude of 60 ∘ on the earth. assume the earth is a rotating sphere.

Calculate the mass defect of the helium nucleus 42He. The mass of neutral 42He is given by MHe=4.002603u.

A person lifts a 4.5 kg cement block a vertical distance of 1.2 m and then carries the block horizontal - ly a distance of 7.3 m. determine the work done by the person and by the force of gravity in this process.

A tree is standing in the middle of a meadow. As you watch, the wind begins to blow and the tree bends. Which statement best explains how you could tell that a net force was acting on the tree? OA) The tree had momentum.

A 5.1 kg black bear cub weighs 49.98 N. The cub is carried by its mother up into the safety of a white pine tree.

Which location is associated with persistent upwelling of cold water to the ocean surface?