If element x has 28'protons how many electirons does it have

Anna heated 15 g of Substance A to obtain 5 g of Substance B, 4 g of Substance C, and a certain amount of Substance D. Which statement is correct? The mass of Substance D was 10 g less than the mass of Substance A.

Due to gravity, the rock strikes the ground at a horizontal distance of 18.1 m from the base of the building. Building 18.1 m 59 ◦ 11.9 m/s h How tall is the building? Assume the ground is level and that the side of the building is vertical.

What is energy at motion called

All meridians converge at

In the three domain system, the domain Eukarya consists of all organisms that have which of the following? Contractile vacuole Nucleus Chloroplast

Without the force of friction, people would not be able to walk.

A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. (a) find its original speed. (b) find its acceleration.

The matter that makes up a planet is distributed uniformly so that the planet has a fixed, uniform density.

3. If the potential difference is 120 volts and the resistance is 60 ohms, what is the current?

Which of galileo's observations most strongly supported a heliocentric cosmology? the phases of venus?