The sun is composed mostly of hydrogen. The mass of the sun is 2.0 * 10^30 kg, and the mass of a hydrogen atom is 1.67 * 10^-27 kg. Estimate the number of atoms in the sun.

Give a statement the best explains the relationship between current, voltage, and resistance.

13. Direct instruction takes place when A. children explore their surroundings and learn based on their own curiosity and interests. B. a skill set is explicitly taught or an activity is completed. C.

True or False The theory of plate tectonics explains how the Earths core moves and why earthquakes and volcanoes occur?

The speed of a transverse wave on a string is 450 m/s, and the wavelength is 0.19 m. The amplitude of the wave is 1.6 mm. How much time is required for a particle of the string to move through a total distance of 1.0 km?

Name at least two limitations of using models in science.

As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. Determine the energy of the absorbed photon in electronvolts.

During an exothermic reaction, the energy given off comes from atoms being consumed mass being burned into energy the breaking and forming of bonds mass being created

Can electrostatic attract both pull and pull?

Ways that charges can be transferred

A cricketer can throw a ball to a maximum horizontal distance of 100m. How much high above the ground can he throw same ball