A family takes a trip from Philadelphia, PA to Washington, D. C. The trip takes 2 hours. They traveled the first hour at 40 km/h and the second hour at 80 km/h. What is their average speed during this trip?

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

The 20@kg wheel has a radius of gyration about its center g of kg = 300 mm. when it is subjected to a couple moment of m = 50 n # m, it rolls without slipping. determine the angular velocity of the wheel after its mass center g has traveled through a distance of sg = 20 m, starting from rest.

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain