F a force of 2020 newtons [N] is applied to a surface and the pressure is measured as 4 comma 5004,500 pascals [Pa], what is the area of the surface in units of square milimeters [mm2]?

If a balloon is taken outside on a very cold day, what will occur?

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?