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dsp73
3 years ago
9

Which feature of electromagnets makes them more useful than permanent

Physics
1 answer:
mezya [45]3 years ago
4 0
I think it’s D................
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A pool is to be filled with 60 m3 water from a garden hose of 2.5 cm diameter flowing water at 2 m/s. Find the mass flow rate of
stealth61 [152]

Answer:

Time= 6.12*10^4s

mass flow rate m=0.98kg/s

Explanation:

Given

Volume= 60m^3

diamter= 2.5cm= 0.025m

radius= 0.0125m

area A= πr^2

area A= 3.142*0.0125^2

area A= 4.9*10^-4m^2

the velocity of the flow 2m/s

<u>volume flow rate </u>

V=vA

V=2* 4.9*10^-4

V=9.82*10^-4 m^3/s

<u>Time taken to fill the pool</u>

time= volume/volume flow rate

time= 60/9.82*10^-4

time= 6.12*10^4s

<u>Mass flow rate </u>

m= density *volume flow rate

Assuming the density of water to be 997kg/m^3

m= 997*9.82*10^-4

m=0.98kg/s

6 0
3 years ago
Calculate the electrical energy expended in a device across which the circuit voltage drops by 50 volts in moving a charge of 6
solmaris [256]
1 volt = 1 joule per coulomb 50 volts = 50 joules per coulomb 50 joules/coulomb times 6 coulombs = 300 joules
5 0
4 years ago
Read 2 more answers
A _____________ is defined as a push or pull that acts on objects and, in some instances, changes their position.
Shkiper50 [21]
Force !!!!!!!!!!!!!!!!!!!!!!!!!!!
6 0
3 years ago
Read 2 more answers
"when you double the vehicle's weight, you will __________ the vehicle's stopping distance. "
Stolb23 [73]

With same braking power you will be stopping faster on the original weight therefore the answer to fill the blank is increase. The stopping distance will increase as there'll be higher energy to dissipate than lighter cars applied with the braking force similar with that of the lighter car. Also the skid and drag will add to the distance as well as the inertia of the moving heavier vehicle would be greater as well.

5 0
3 years ago
Pls help me w this, I've been doing this since 5 minutes ago​
natka813 [3]

Answer:

t=0.0625s

Explanation:

F=number of swings/time taken

DATA

Frequency=4.0Hz

number of swings from Q to R

=1/4

time taken=?

Frequency=number of swings/time taken

make t the subject of the formula

t=n/f

substitute the given date

t=0.25/4.0

t=0.0625s

option A is collect

4 0
3 years ago
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