What is heavier a pound of lead or a pound of photons?

Trace fossils are not fossils of the animal themselves but are impressions of their activities such as trails worm holes

What is temperature? Question 10 options: A. An indirect measure of heat energy B. The same thing as heat energy C. A direct measure of internal kinetic energy D. The amount of calories in a substance E. A direct measure of external kinetic energy

The law of conservation of matter states that during a chemical reaction

Erosion and weathering can Both cause changes to the surface of earth which of the following happens only because of erosion and not because of weathering

What is the velocity in an object

What is the force of gravity acting on a 2000-kg spacecraft when it orbits two Earth radii from the Earth's center (that is a distance r=6380 km above the Earth's Surface. The mass of the Earth is 5.98 x 1024 kg.

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume

A two stage rocket leaves its launch pad moving vertically with an average acceleration of 4 m/s2. at 10 s after launch the first stage of the rocket (now without fuel) is released.