Salt water is denser than fresh water. What ecosystem would be most effective by this fact?

What did Edwin Hubble discover about galaxies that allowed him to determine the expansion rate of the universe? A. The farther away a galaxy was, the less its light was shifted toward the red end of the spectrum. B.

If a hazelnut falls from a tree when the wind is blowing north, where will it land?

A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do?

A 1.79 m long uniform rod with a mass of 2.03 kg is allowed to rotate. By pushing perpendicularly on the edge of the rod, a student produces an angular acceleration of 12.9 rad/s2.

What is the currency for performing work and what is its unit?

What is a circuit, s resistance if 12v produces 2A of current?

Dinosaur fossils are too old to be reliably dated using carbon-14, which has a half-life of about 5730 years. Suppose we had a 68 million year old dinosaur fossil.

A power station delivers 510 kw of power at 12,000 v to a factory through wires of total resistance of 2.5 ω. how much less power is wasted if the electricity is delivered at 47,000 v rather than 12,000 v?

Two spaceships of mass 300,000 kg are 250 m apart. what is the force of gravity between them? (G = 6.67 times 10⁻¹¹ N*M²/kg²)

Air pressure is 1.0 · 105 N/m2, air density is 1.3 kg/m3, and the density of soft drinks is 1.0 · 103 kg/m3. If one blows carefully across the top of a straw sticking up 0.