A counter-flow double-pipe heat exchanger is to heat water from 20°c to 80°c at a rate of 1.2 kg/s. the heating is to be accomplished by geothermal water available at 160°c at a mass flow rate of 2 kg/s. the inner tube is thin-walled and has a diameter of 1.5 cm. if the overall heat […]
What minimum number of cycles are necessary for the engine to lift a rock of mass 570 kg through a height of 150 m?
What frequency frecede is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it? express your answer in hertz?
. James operates an airplane that departs from JFK Airport with a constant net force of 40,000 N. The mass of James is 80 kg and the plane’s mass is 30,000 kg. What is the net force that acts on James? 2. Susan pushes her dad, David, on an ice rink with a force of […]
A soccer ball is kicked with a speed of 20 m/s at an angle of 35 degrees above the horizontal. how long is the ball in the air?
A 58-in. (inside) diameter garden hose is used to fill a round swimming pool 7.5 m in diameter. part a how long will it take to fill the pool to a depth of 1.7 m if water issues from the hose at a speed of 0.67 m/s ?
A long, flexible, and very light strip of metal, such as a saw blade, is clamped to the edge of a table, extending horizontally over the edge like a miniature diving board. when a gob of putty is placed on the end, the strip sags and comes to a new equilibrium position with its tip […]
What spring constat would you need to have a 3 kg mass oscillate on the spring iwht hte same period t as the mass owuld have hanging from a simple?
Which has the larger kinetic energy, a 13 g bullet fired at 490 m/s or a 10 kg bowling ball rolled at 11 m/s?
Unpolarized light passes through three ideal polarizing filters. the first filter is oriented with a horizontal transmission axis, the second one has its transmission axis at 30° from the horizontal, and the third filter has a vertical transmission axis. what percent of the light gets through this combination?
