Which of the following is not true of exercise machines?
a.
most exercise machines are expensive to purchase individually.
b.
most exercise machines require spotters for safe operation.
c.
most exercise machines require less skill to use than free weights.
d.
most exercise machines can only be used for a limited number of exercises.

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg