Betty weighs 432 n and she is sitting on a playground swing seat that hangs 0.41 m above the ground. tom pulls the swing back and releases it when the seat is 0.94 m above the ground. the acceleration of gravity is 9.8 m/s 2 . how fast is betty moving when the swing passes through its lowest position? answer in units of m/s.

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

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.

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.