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3 years ago

1 point

Physics

1 answer:

Tju [1.3M]3 years ago

7 0

Answer:

Option A nuclear

Explanation:

The rate of electricity production in nuclear power plant is much higher as compared to the rate of electricity generation in gas, wind and solar power plants.

Thus, in case where large amount of electricity is to be produced in a short period then one must rely on nuclear power plants.

Therefore, option A is correct

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At 3.00 m from a source that is emitting sound uniformly in all directions, the sound level (b) is 60.0 dB.

grigory [225]

Given that,

At 3.00 m from a source that is emitting sound uniformly in all directions, the sound level is 60.0 dB.

To find,

The distance from the source would the sound level be one-fourth the sound level at 3.00 m.

Solution,

The intensity from a source is inversely proportional to the distance.

Let I₁ = 60 dB, r₁ = 3 m, I₂ = 60/4 = 15 dB, r₂ =?

Using relation :

$\dfrac{I_1}{I_2}=\dfrac{r_2^2}{r_1^2}\\\\r_2^2=\dfrac{I_1r_1^2}{I_2}\\\\r_2^2=\dfrac{60\times (3)^2}{15}\\\\r_2=6\ m$

So, at a distance of 6 m the sound level will be one fourth of the sound level at 3 m.

8 0

2 years ago

the current flowing in an appliance connected to a 120V source is 2A. How many kilowatt-hours of electrical energy does the appl

skad [1K]

Answer:

0.96 kWh

Explanation:

First of all, we can find the power of the appliance using the formula:

$P=VI$

where

V = 120 V is the voltage of the source

I = 2 A is the current

Substituting,

$P(120 V)(2 A)=240 W = 0.24 kW$

Now we want to find the amount of energy used by the applied in a time of

t = 4 h

The amount of energy is given by

$E=Pt$

where

P = 0.24 kW

t = 4 g

Substituting,

$E=(0.24 kW)(4 h)=0.96 kWh$

8 0

3 years ago

1. horizontal row in the periodic table____ 2. vertical column in the periodic table____ 3. A repetition of properties occurs wh

Anna11 [10]

Answer:

1. Periods

2. Groups of families

3. the statement is true about Periodic law

4. metals

5.transition metals

6.atomic radius

7. cations

8. electrons

9. electronegativity of the atom

10. ionization energy

Explanation:

1. horizontal row in the periodic table____are called Periods

2. vertical column in the periodic table____ are called Groups of families

3. A repetition of properties occurs when elements are arranged in order of increasing atomic number.____ True about Periodic Law (most elements that fall within the same families has similar properties)

4. type of element that is a good conductor of heat and electric current____ are metals that are found in group 1 and 2 of the periodic table Boron, tin, silver, Zinc, Alluminium, Germanium, Pollonium, antimony, e.t.c

5. type of element characterized by the presence of electrons in the dorbital____are called transition metals

6. one-half the distance between the nuclei of two atoms when the atoms are joined____ are called atomic radius

7. type of ion formed by Group 2A elements____are Cations

8. subatomic particles that are transferred to form positive and negative ions____ are called electrons

9. ability of an atom to attract electrons when the atom is in a compound____ is called electronegativity of the atom

10. energy required to remove an electron from an atom is called ionization energy

4 0

3 years ago

The thickness of a flange on an aircraft component is uniformly distributed between 0.95 and 1.05 millimeters. (a) Determine the

Igoryamba

Answer:

The proportion of flanges that exceeds 0.99 millimeters is 0.6

Explanation:

Given;

integral range of [0.95, 1.05]

Let X be a variable with uniform distribution over the given range.

$Then, f(x) = \frac{1}{1.05 -0.95} =10$

1 - 0.95 = 0.05, 1.05 - 1 = 0.05

$\ minimum, f_(x) = \frac{0.05}{1.05 -0.95} =0.5\\\\$

interval = 10 - 0.5 = 9.5

F(x) = 10x + 9.5

When, X exceeds 0.99 millimeters, then the proportion of flanges will be;

P (X > x) = 1 - F(x)

P( X > 0.99 ) = 1 - 10(0.99) + 9.5

P( X > 0.99 ) = 0.6

Therefore, the proportion of flanges that exceeds 0.99 millimeters is 0.6

8 0

3 years ago

An icicle falls off of a skyscraper from rest and falls for 34 seconds. How fast will that icicle be moving after that time? Sho

goblinko [34]

Answer:

<em>The icicle will be moving at 333.54 m/s</em>

Explanation:

<u>Free Fall Motion </u>

A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is $g = 9.81 m/s^2$ .

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The icicle falls from rest for 34 seconds. We need to find the speed after that time:

vf = 9.81*34

vf = 333.54 m/s

The icicle will be moving at 333.54 m/s

7 0

2 years ago