Points a and b are 1 km apart along a 15 cm diameter new steel pipe. point b is 20 m higher than point a. with a flow from a to b of 0.03 m3 /s of water, what pressure must be maintained at a if the pressure at b is 250 kpa? roughness of the steel pipe = 0.05 mm

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

22. the effect of threshold braking is to a cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.