Which of the following is an example of a pure substance?

A. a sample of oxygen gas

B. a solution of sugar water

c. a mixture of pasta and sauce

D. an alloy of iron and carbon

A block of mass 1.5 kg slides down an inclined plane has no friction and the black starts at height of 3 m, how much kinetic energy does the black have when it reaches the bottom

Why is the nitrogen cycle considered a closed system? A. because nitrogen is fixed by bacteria and assimilated by plants B. because nitrogen neither enters nor leaves the system C. because nitrogen is converted into nitrates and ammonia D.

A vibration platform oscillates up and down with a fixed amplitude of 8.1 cm and a controlled frequency that can be varied.

give three examples from the device on the apply page where potential energy was converted to kinetic energy

Which best describes a chemical reaction

An example of objects the move in revolution

How many hops does a kangoroo do in 1 day

What are the average velocity and average acceleration of the tip of a 2.4 cm long hour hand of a clock?

What is the number one and most important rule to remember in soccer?

Why are convection currents; why are they hotter and colder parts of earth