Astronomy | Astrophysics Answers

Fill a 250 mL beaker with water. Get two plastic straws 12 cm long. Place one straw

in the beaker with water. Place the second straw in the position shown in the figure, and blow

hard. Ask a classmate to observe the level of water in the first straw before blowing and while

blowing into the second straw. Why does the water rise when you blow into the second straw?

A horizontal pipe is 2 cm in radius at one end and increases in size so that it is 5 cm in radius at

the other end. Water is pumped into the small end of the pipe at 10 m/s and a pressure of

300 kPa (kilopascal). Find the

a.) speed and

b.) pressure of the water at the pipe’s large end.

Calculate the pressure needed for the pump of a 3 cm radius fire hose to pump water through 

its nozzle of radius 2 cm at an average speed of 4 m/s when the nozzle is 15 m above the fire 

track. 

A very wealthy woman who loves soda builds her house with a cylindrical pipe that transports Mountain Dew from downstairs to her upstairs bedroom. The Mountain Dew enters the house downstairs via a pipe with a cross sectional area of 0.0036 m2 where it is traveling with a speed of 0.48 m/ s . At the wealthy lady's bedroom, the faucet pipe through which the Mountain Dew exits has an area of 0.0012 m2. What is the speed of the Mountain Dew as it exits the faucet pipe in the lady's bedroom?

 The heart of a resting adult pumps blood at a rate of 5.00 Liters/min. 

a.) Convert this to cm3/ s. 

b.) What is this rate in m3/s? 

An irigation canal has a rectangular cross-section of 5 m width and 1.2 m depth. If water flows at a speed of 0.8 m/s, what is its flow rate? 

A water pipe narrows from a radius of r1 = 4.99 cm to a radius of r2 = 2.75 cm. If the speed of the water in the wider part of the pipe is 1.31 m/s, what is the speed of the water in the narrower part? 

A satellite is in a circular orbit around the planet saturn. Derive the relationship between the period of the satellite, the mass of Saturn and the radius of orbit

A block of wood with length = 2.5 m, width = 0.5 m and height = 0.4 m. The density of water

is 1000 kg/m3. If the block is placed in the water, what is the buoyant force ?

A ship weighing 46 328 tons is lowered into water. What weight of water would it 

displace?