if a rock has a speed of 12 m/s as it hits the ground, from what height did it fall assuming the speed was zero. its mass is 50 kg

If you double the frequency of a pendulum what happens to the period Of one cycle ?

Thermohaline circulation is mainly due to

Which statement about the physical change of liquid water boiling into steam is true? The heat added represents an energy change. The action cannot be reversed. The steam cannot conserve mass. The weight lost represents a mass change.

When a person inhales, air moves down the bronchus (windpipe) at 14 cm/s. the average flow speed of the air doubles through a constriction in the bronchus. assuming incompressible flow, determine the pressure drop in the constriction.

In an old-fashioned pendulum clock, the bob is moved up and down to adjust the clock to keep accurate time. how would you adjust the bob in order to correct a clock that runs too fast? explain why the adjustment works.

A swimming pool has the dimensions of 10 meters, 5 meters, and 1 meter. What is the pool's volume? 50 m 50 m3 50 m2 25 m3

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy