In which way does Stephen Hawking use mathematics in his work?

If forced air furnace heats a house until all the air is the same temperature as the air coming from the furnace then

Sodium bicarbonate is the chemical name or baking powder. It's chemical formula is NaHCO3. What does the subscript 3 mean

For each of the following, draw the resulting wave when the two pulses occupy the same space. Unless otherwise noted, each wave has an amplitude of + / - A.

A 27.5 kg ball is thrown at an angle of 22.7° above the horizontal off of a building such that its initial potential energy is 423 J, and the initial kinetic energy is 347 J.

What is the same person's mass on mars, where the acceleration due to gravity is 3.7 m/s2?

You raise a 1200-N piano a distance of 5.00 m using a set of pulleys. You pull in 20 m of rope while exerting a force of 340 N.

Ina shoots a large marble (Marble A, mass: 0.08 kg) at a smaller marble (Marble B, mass: 0.05 kg) that is sitting still. Marble A was initially moving at a velocity of 0.5 m/s, but after the collision it has a velocity of - 0.1 m/s.

The elements that touch the zigzag line ar classified as

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed? A. 25 g B. 100 g C. 75 g D. 50 g

During a transit, a passes in front of its parent star, temporarily decreasing the star's brightness by a small amount.