What is the middle layer of earth called

Juan is standing on the street. An ambulance moves toward him and then passes by. What best describes the pitch that Juan hears? The pitch remains constant as the ambulance moves toward and then away from Juan.

A 9-hp (shaft) pump is used to raise water to an elevation of 15 m. If the mechanical efficiency of the pump is 82 percent, determine the maximum volume flow rate of water. Take the density of water to be rho = 1000 kg/m3.

The weakening of rock due to expansion and contraction resulting from temperature changes is known as A. thermal stress. B. leaching. C. exfoliation. D. haloclasty.

At one instant in time, a rock falling off a cliff experiences an upward force from air resistance at a magnitude of 10 N. The rock itself has a mass of 7 kg.

What is the difference between methane and fluorinated gases

Compare the friction force on the cart when it is rolling along the blacktop parking lot to the friction force on the cart when it is inside the grocery store (assume the flooring is smooth vinyl tile).

Which of the following objects has the most kinetic energy? a car going 60 miles per hour a spring that is compressed a rock sitting on the edge of a cliff a bicycle going 10 miles per hour

Which type of environment results from an equal amount of solute and solvent in and out of the cell? A. hypertonic environment B. isotonic environment C. hypotonic environment D.

If a 75 W lightbulb operates at a voltage of 120 V, what is the current in the bulb?* A. 1.6A B. 9000 A C. 195 A D. 0.63 A

A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. Long after contact is made with the battery (a) the voltage across the capacitor is A) equal to the battery's terminal voltage.