An object is falling toward Earth's surface, and its acceleration due to gravity is measured. What is NOT needed to calculate Earth's mass?

Water is most dense at 4 degrees Celsius. Since at this temperature 1 ml of water has a mass of 1 g. What is its density?

Which would show an example of how physical changes are reversible? Cutting a gold bar in two peices and then putting the pieces next to eachother. Or burning a match and then relighting it. Or melting tin and then cooling it into a mold.

How many factors affect acceleration

Sediments in and below a dewatered area of an aquifer become compacted because:A. water pressure drops and the pore spaces are closedB. water pressure increases and the pore spaces become too porousC.

A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour.

The intensity of the sun's radiation incident upon the earth is about i=1.4kw/m2. suppose this is the value for the intensity of sunlight incident upon the satellite's solar panels. what is the total solar power p absorbed by the panels?

Which possible discovery would be attributed to an inorganic molecule? a protein that contains more energy than lipids a fireproofing spray used in firefighting a new energy-efficient fuel source a synthetic polymer that resists degrading

A light beam in air strikes the surface of water at an angle of 26° with the normal. When it enters the water it bends toward the normal, making an angle of 19° with it. The velocity of light in air is approximately 300,000 km/s.

Which best explains the relationship between the speed of sound and the medium through which it passes?

g The magnetic force on a charged particle A. depends on the sign of the charge on the particle. B. depends on the velocity of the particle. C. depends on the magnetic field at the particle's instantaneous position. D.