What is dark matter?

13. Which best summarizes the change in number and size of microcontinents during the Proterozoic? a. the number of microcontinents increased and the size increased b. the number of microcontinents increased and the size decreased c.

A mechanical device requires 500j of work to do 200j of work in lifting a box. What is the efficiency of the device?

A battery is connected to a resistor. as charge flows, the chemical energy of the battery is dissipated as

If the Moon rises at a given location at 6:00 p. m. today, about what time will it rise tomorrow night?

C. gas. 8. Which action involves a chemical change? a. making ice cubes b. adding sugar to tea c. cutting wrapping paper d. baking a cake

What energy do electrons have when they are farther away from the nucleus?

200 525000 lololo Boat A is 10 km north of a port. Boat B is 5 km east of the same port. Boat A sails in a straight line towards boat B. Work out the bearing on which boat A sails.

Is Li greater than He on the periodic table?

White light falls on a yellow filter, if: (a) A green filter is placed behind a yellow filter, what is the colour of the light that will emerge from the green filter?

Calculate the energy equivalent in joules of the mass of a proton. [Show all work, including the equation and substitution with units.]