A ball traveling 20 m/s strikes a wall and rebounds in the opposite direction at 18 m/s. If the collision with the wall took 0.2 s, what was the average acceleration of the ball? 2 m/s2
190 m/s2
38 m/s2
10 m/s2

The a992 steel rod bc has a diameter of 50 mm and is used as a strut to support the beam. determine the maximum intensity w of the uniform distributed load that can be applied to the beam without risk of causing the strut to buckle. take f.s. = 2 against bucklin

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.