A large box, labeled 1500 kg, and a small box, labeled 1.5 kg. Next to each box draw an arrow, pointing right, labeled 10 N. Ask students to explain which box will experience the greater acceleration, and to use Newton’s laws to explain. For bonus points, ask students to calculate the acceleration on each box, assuming that there is no friction between the boxes and the surface beneath them.

What can change the speed of sound as it travels through the ocean? a. salinity only b. density and salinity c. salinity and distance from land d. density and distance from land

Now assume that tweedledum applies an upward force at the far left end of the board (fleft) and that tweedledee applies an upward force at the far right end of the board (fright). with what force does each person lift? recall that the weight of the board is w.

The rate at which a body cools also depends on its exposed surface area s. if s is a constant, then a modification of (2), given in section 3.1, is dt dt = ks(t − tm), where k < 0 and tm is a constant. suppose that two cups a and b are filled with coffee at the same time. initially, the temperature of the coffee is 145° f. the exposed surface area of the coffee in cup b is twice the surface area of the coffee in cup a. after 30 min the temperature of the coffee in cup a is 95° f. if tm = 65° f, then what is the temperature of the coffee in cup b after 30 min? (round your answer to two decimal places.)