g The rate of change of the velocity of a bullet fired into a sand pile is directly proportional to the square root of the velocity of the bullet. Write and solve a differential equation that expresses the rate of change of the bullet's velocity. If a bullet with initial velocity of 324 feet per second (fps) will travel for 0.09 seconds after impact, then for how long will a bullet with initial velocity of 196 fps travel

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)

What types of radiation make up the electromagnetic spectrum?