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Diano4ka-milaya [45]
3 years ago
12

Within visible light, violet has the lowest frequency. a. True b. False

Physics
1 answer:
dsp733 years ago
3 0
False it has the highest frequency
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a refridgerator has a coefficient of performance equal to 4.2 how much work must be done on the refridgerator in order to remove
anastassius [24]

Answer:

60 J

Explanation:

Given That

Coefficient of performance, CoP = 4.2

Quantity of heat of the refrigerator, Q = 250 J

Work done by the refrigerator, W = ?

First, it should be noted that the Coefficient of Performance can be said to be, the ratio of the Heat required to the Work done by the system. Mathematically written as,

CoP = Q / W

Since we are already given the values from our question, we can plug it in as it's a pretty straightforward question

4.2 = 250 / W, making W subject of formula, we have

W = 250 / 4.2

W = 60J

Thus, the Work done by the refrigerator is 60 J

5 0
3 years ago
What are some common measurements that are given as a rate?
BabaBlast [244]

Answer:

taco bell

Explanation:

6 0
4 years ago
When _______ light passes through a prism or diffraction grating
lana66690 [7]
I don’t know ... sorry
5 0
4 years ago
A block with a mass of 9.00 kg is pulled at a constant speed across a horizontal tabletop with a spring scale. The scale reads 6
snow_tiger [21]

Answer:0.69

Explanation:

Coefficient of kinetic friction=f/R=61.8/90=0.69

7 0
3 years ago
The magnetic flux through a metal ring varies with time t according to ΦB = at3 − bt2, where ΦB is in webers, a = 6.00 Wb s−3, b
pychu [463]

To solve this problem it is necessary to apply the second derivative of the function to find the maximum time reference and thus calculate the maximum voltage.

With the maximum voltage by Ohm's Law it is possible to find the maximum current.

Ohm's law defines that

E = I*R

Where,

I = Current

R= Resistance

On the other hand by faraday studies and the potential can be expressed at the rate of change of the electric flow, that is

E = \frac{d\phi}{dt}

Replacing with our values we have that

E = \frac{d(6t^3-18t^2)}{dt}

E = -18t^2 +36t

The second derivative is

E' = -36t+36

When E' = 0 we have a Maximum, then

0 = -36t+36

t = 1

Therefore when the time is 1s E has a Maximum, replacing at the function

E(t) = -18t^2 +36t

E(1) = -18(1)^2 +36(1)

E = 18V

Then the maximum current will be given by

I = \frac{E}{R}

I = \frac{18}{2.8}

I = 6.42A

Therefore the maximum current induced in the ring is 6.42A

6 0
4 years ago
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