Answer:


Explanation:
Given:
- flow rate of water,

<em>∵Density of water is 1 kg per liter</em>
∴mass flow rate of water, 
- height of pumping,

- efficiency of motor drive,

- diameter of pipe,

<u>Now the power required for pumping the water at given conditions:</u>



<u>Hence the electric power required:</u>



<u>Flow velocity is given as:</u>

where: a = cross sectional area of flow through the pipe


We use the formula, to calculate the volume of water displaced by concrete canoe,

Here, W is the weight of concrete canoe and
is the specific weight of water and its value is
.
So,
.
Now the volume of water occupied in ultra lightweight kevlar canoe,

Here, w is weight of kevlar canoe.
So,

Thus, the volume of water displaced,
.
Hence, the volume of water displaced canoe compared to an ultra-lightweight kevlar canoe is 
Answer: You use it to cook food so you can eat. put whatever kind of food you like in there and heat it up for how long you want and then it will beep when done. then you can eat!
Answer:
D &B
Explanation:
Using Fleming right hand rule that States that if the fore-finger, middle finger and the thumb of left hand are stretched mutually perpendicular to each other, such that fore-finger points in the direction of magnetic field, the middle finger points in the direction of the motion of positive charge, then the thumb points to the direction of the force
Constant velocity means the netto force = 0, therefore F(gravity) = F(astronaut).
175N divided by 87,5kg = 2.00kg/N