Which is an example of a compound?

A - gold

B-sand

C-iodine

D-water

What early advance first increased the ability to communicate over long distances?

A machine runs for 50 seconds with a steady power output of 100 watts. How many joules of work does the machine produce in those 90 seconds?

What causes a solar nebula to initially bring to form a solar system

The weight of a block on the inclined plane is 500 N and the angle of incline is 30 degrees. What is the magnitude of the force of friction for static equilibrium? What is the normal force of the surface pushing up on the block?

The chains and sheets of galaxies and voids between them observed in the large-scale structure of the universe were once thought to be inconsistent with the Big Bang theory.

What is the acceleration of all objects due to gravity? What does this mean?

Which is the correct formula for cellular respiration? a. 6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2 b. CO2 + H2O → C6H12O6 + O2 c. C6H12O6 + O2 → CO2 + H2O d. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + ATP energy

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.

Consider two cars, a 700kg Porsche and a 600kg Honda Civic. The Porsche is speeding along at 40 m/s (mph) and the Civic is going half the speed at 20 m/s.

Which statement about an electron in the 4d state is correct? A. The magnitude of its orbital angular momentum is 6√ℏ. B. The largest orbital angular momentum it could have in any given direction is 4ℏ. C.