Setting concrete at 50°C is preferable to setting it at 5°C. Why? At 50°C, the concrete sets more quickly.
At 50°C, the concrete sets more slowly.
At 50°C, the concrete sets to have a greater final compressive strength.
At 50°C, the concrete sets to have a lesser final compressive strength.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. determine the term.