steam power plant burns 50 tons of coal every hour. The useful power output of the plant is 130 MW megawatts =10^ 6 watts. What is the efficiency of this plant? (Take 9cool=30 MJ/kg)

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m