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3 years ago

A temperature of 20°C is equivalent to approximately?

Physics

2 answers:

umka21 [38]3 years ago

7 0

The answer is A.68 degrees

Step2247 [10]3 years ago

4 0

i think its (a) too.

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Which elements do hydrogen fuel cells combine to produce electricty

NARA [144]

A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. Fuel cells are often compared to batteries. Both convert the energy produced by a chemical reaction into usable electric power.

3 0

2 years ago

A constant magnetic field passes through a single rectangular loop whose dimensions are 0.35 m × 0.55 m. The magnetic field has

Pani-rosa [81]

Answer:

Part a)

$EMF = 0.38 V$

Part b)

$\frac{dA}{dt} = 0.43 m^2/s$

Explanation:

Part a)

Initial value of magnetic flux is given as

$\phi_1 = BAcos\theta$

$\phi_1 = (2.1)(0.35 \times 0.55) cos65$

so we have

$\phi_1 = 0.17 Wb$

Final flux through the loop is given as

$\phi_2 = 0$

now EMF is given as

$EMF = \frac{\phi_1 - \phi_2}{\Delta t}$

$EMF = \frac{0.17 - 0}{0.45}$

$EMF = 0.38 V$

Part b)

If magnetic field is constant while Area is changing

So EMF is given as

$E = Bcos65 \times \frac{dA}{dt}$

$0.38 = 2.1 cos65(\frac{dA}{dt})$

$\frac{dA}{dt} = 0.43 m^2/s$

5 0

2 years ago

Please help I’ll name you brainliest and give five stars please

OLga [1]

Answer:

i think its 10 or 11 not sure though if its wrong im sorry im trying to help

Explanation:

7 0

3 years ago

State the mathematical form of universal law of gravitation

Andrew [12]

Answer:

Newton's Universal Law of Gravitation: 'a simple equation, but devastatingly effective'. ... The equation says that the force (F) between two objects is proportional to the product of their masses (m1 and m2), divided by the square of the distance between them.

Explanation:

3 0

3 years ago

A parking lot charges 3 dollars for the first hour (or part of an hour) and 2 dollars for each succeeding hour (or part), up to

Aneli [31]

Answer:

function is discontinuous

and

after 3 hours upto day 24 hours fix charge $10

so there are discontinuous at 1st hour, 2nd hours and 3rd hours

Explanation:

given data

charge = $3 for 1st hour

charge = $2 for each succeeding hour

maximum charge = $10 daily

to find out

Is this function continuous

solution

their function is 3 +2x

so function is discontinuous here

and

this is very clear for 1st hour or part of hour it mean charge a fix value in given time

anyone who park fix charge for 60 min up to the 3 hours

after that for day 24 hours fix charge $10

so there are discontinuous at 1st hour, 2nd hours and 3rd hours

6 0

3 years ago