Two microwave signals of nearly equal wavelengths can gener- ate a beat frequency if both are directed onto the same microwave detector. In an experiment, the beat frequency is 100 MHz. One microwave generator is set to emit microwaves with a wavelength of 1.250 cm. If the second generator emits the longer wavelength, what is that wavelength

Answer:

Explanation:

Thinking about the logics it can but it may be dim because 1.12 is lower than 2,5v so this will mean u lamp may not work or may work very dimely due to the low voltage it is receiving.

Answer:

[tex]0.0018\ \text{N/C}[/tex] towards the right.

[tex]0.001\ \text{N/C}[/tex] towards the right.

Explanation:

[tex]q_1=4\ \mu\text{C}[/tex]

[tex]q_2=14\ \mu\text{C}[/tex]

[tex]Q=5\ \text{nC}[/tex]

[tex]r_1=r_2=0.5\ \text{m}[/tex]

Let [tex]Q[/tex] be placed at origin so [tex]q_1[/tex] becomes negative and [tex]q_2[/tex] becomes positive

Electric field is given by

[tex]E=\dfrac{kq_1Q}{r_1^2}+\dfrac{kq_2Q}{r_2^2}\\\Rightarrow E=\dfrac{kQ}{r^2}(q_1+q_2)\\\Rightarrow E=\dfrac{9\times10^{9}\times 5\times10^{-9}}{0.5^{2}}(-4\times10^{-6}+14\times10^{-6})\\\Rightarrow E=0.0018\ \text{N/C}[/tex]

The electric field halfway between the points is [tex]0.0018\ \text{N/C}[/tex] towards the right.

[tex]r_1=0.5\ \text{m}[/tex]

[tex]r_2=1+0.5=1.5\ \text{m}[/tex]

[tex]E=9\times 10^9\times 5\times 10^{-9}(\dfrac{4\times 10^{-6}}{0.5^2}+\dfrac{14\times 10^{-6}}{1.5^2})\\\Rightarrow E=0.001\ \text{N/C}[/tex]

The electric field halfway between the points is [tex]0.001\ \text{N/C}[/tex] towards the right.

The increase in thermal energy of the gas sample is +14 J, and the temperature is increased.

Given information:

The heat removed from the gas sample is [tex]Q=-14\rm\;J[/tex]. The negative sign represents the heat removal.

The work done on the gas sample is [tex]W=28\rm\; J[/tex].

Work is done on the gas. So, it will be taken as positive.

According to the first law of thermodynamics, the change in thermal energy of the  gas or system will be calculated as,

[tex]\Delta E=Q+W\\\Delta E=-14+28\\\Delta E=14\rm\;J[/tex]

The change in thermal energy of the system will be 14 J. It is positive. So, the thermal energy is increased. It implies the temperature of the system or gas is also increased.

Therefore, the increase in thermal energy of the gas sample is +14 J, and the temperature is increased.

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Answer:

a. Q = 1881.73 x [tex]10^{-13}[/tex] C

b. As battery is not removed so, potential difference will remain same.

c. E = 21.42 x [tex]10^{3}[/tex] V/m

d. Q = 895.5 x [tex]10^{-13}[/tex] C

e. Again the potential difference will not change it will remain same as 9 V

f. E = 45 x [tex]10^{3}[/tex] V/m

Explanation:

Solution:

Here, Teflon is used so, the dielectric constant of the Teflon K = 2.1

Diameter = 2.1 cm

Radius = 2.1/2 cm

Radius = 1.05 cm

Radius = 0.015 m

Now, we need to find the area of each plate:

A = [tex]\pi r^{2}[/tex]

A = (3.14) ([tex]0.015^{2}[/tex])

A = 0.000225 [tex]m^{2}[/tex]

A = 2.25 x [tex]10^{-4}[/tex] [tex]m^{2}[/tex]

We are given the thickness of the plate which equal to the distance between the two plates.

d = 0.20 mm = 0.2 x [tex]10^{-3}[/tex] m

d = 0.2 x [tex]10^{-3}[/tex]  m = distance between two plates.

Hence, the capacitance of the dielectric without the dielectric

C = [tex]\frac{E.A}{d}[/tex]

Putting up the values we get,

E = 8.85 x [tex]10^{-12}[/tex]

C = [tex]\frac{8.85 . 10^{-12} x 2.25 . 10^{-4} }{0.002}[/tex]    

C = 99.5 [tex]10^{-13}[/tex]

If dielectric is included then,

[tex]C^{'}[/tex] = K C

[tex]C^{'}[/tex] = (2.1) ( 99.5 x [tex]10^{-13}[/tex])

[tex]C^{'}[/tex] = 209.08 x [tex]10^{-13}[/tex] F

As we know the voltage of the battery V = 9V So,

a) Charge before the Teflon is removed:

Q = CV

Q = [tex]C^{'}[/tex]V

Q = (209.08 x [tex]10^{-13}[/tex] F) (9V)

Q = 1881.73 x [tex]10^{-13}[/tex] C

b) Potential Difference before the Teflon is removed = ?

As battery is not removed so, potential difference will remain same.

c) Electric Field =?

As we know,

E = V/(K.d)

E = 9V/(2.1 x 0.2 x [tex]10^{-3}[/tex])

E = 21.42 x [tex]10^{3}[/tex] V/m

d) After the Teflon is removed

Q = CV

Q = (99.5 [tex]10^{-13}[/tex] ) ( 9)

Q = 895.5 x [tex]10^{-13}[/tex] C

e) Again the potential difference will not change it will remain same as 9 V

f) Electric Field = ?

E = [tex]\frac{V}{d}[/tex]  (Teflon is removed)

E = 9/0.2 x [tex]10^{-3}[/tex]

E = 45 x [tex]10^{3}[/tex] V/m

Answer:

0.83 m³/s  

Explanation:

The speed of the airflow is given as;

             1.85 x 10³ ft³/min

Now we are to express this unit in m³/s  

    1ft  = 0.3m

    60s  = 1 min

So;

  1.85 x 10³  x ft³ x [tex]\frac{1}{min}[/tex] x [tex]\frac{(0.3m)^{3} }{ft^{3} }[/tex] x [tex]\frac{1min}{60s}[/tex]  

    = 0.83 m³/s  

Answer:

Hydrochloric and Hydrofluoric Acids.

Answer:

F = 402.18 N

Explanation:

Given that,

A particular satellite with a mass of m is put into orbit around Ganymede (the largest moon of Jupiter) at a distance 300 km from the surface. Let the mass of the satellite is 350 kg.

We need to find the gravitational force of attraction between the satellite and the moon.

The formula for the gravitational force is given by :

[tex]F=G\dfrac{Mm}{(R+h)^2}[/tex]

M is mass of Ganymede

m is mass of satellite

R is Radius of Ganymede

h is distance = 300 km

Putting all the values,

[tex]F=6.67\times 10^{-11}\times \dfrac{1.48\times 10^{23}\times 350}{(2631\times 10^{3}+300\times 10^3)^2}\\F=402.18\ N[/tex]

So, the required force of attraction between the satellite and the moon is 402.18 N.

the shadows are exactly the same length in the morning as they are in the evening.

 is so obvious it’s that when the sun is low you get long shadows and when the sun is up in the sky like in the noon the shadow is shorter.

Answer:

Ribosomes are organelles the make protein for the cell.

Answer:

8 N

Explanation:

From Newtons second law of motion, we have;

F = ma

where: F is the force applied, m is the mass of the object, and a is its acceleration.

From the given question: mass of box  = 4 kg and acceleration of the box  = 2 m/[tex]s^{2}[/tex], then;

F = 4 x 2

  = 8

F = 8 N

The amount of force to be used is 8 N.  

Answer:

v = 3.34 m/s

Explanation:

Given that,

Distance, d = 1100 m

Time, t = 330 s

We need to find the average speed of the Megan. It is equal to the total distance divided by total time taken.

[tex]v=\dfrac{1100\ m}{330\ s}\\\\v=3.34\ m/s[/tex]

So, the average speed of Megan is 3.34 m/s.

Answer:

33.3

Explanation:

Answer:

[tex]v_{2'}=8.1\:\mathrm{m/s}[/tex]

Explanation:

In a perfectly elastic collision, the total kinetic energy of the system is maintained. Therefore, we can set up the following equation:

[tex]\frac{1}{2}m_1{v_1}^2+\frac{1}{2}m_2{v_2}^2=\frac{1}{2}m_1{v_{1'}}^2+\frac{1}{2}m_2{v_{2'}}^2[/tex]

Since the second block was initially at rest, [tex]\frac{1}{2}m_2{v_2}^2=0[/tex].

Plugging in all given values, we have:

[tex]\frac{1}{2}m_1{v_1}^2=\frac{1}{2}m_1{v_{1'}}^2+\frac{1}{2}m_2{v_{2'}}^2,\\\\\frac{1}{2}\cdot4.4\cdot8.4^2=\frac{1}{2}\cdot 4.4 \cdot (-2.5)^2+\frac{1}{2}\cdot 4.4\cdot {v_{2'}}^2,\\\\{v_{2'}}=\sqrt{64.31},\\\\{v_{2'}}\approx\fbox{$8.1\:\mathrm{m/s}$}[/tex]..

Answer:

E; The object is negatively charged

Explanation:

Here, we want to state the conclusion that can be drawn from a positively charged rod being attracted to an object.

Generally as we know, oppositely charged materials attract while the ones with same charges repel each other.

Thus, in this case, for the rod to attract the object, there must have been an opposite charge of negativity on the object

So we conclude that the reason why the rod attracted the object was because of the presence of opposing charges on both of them. And since the rod has taken the positive charge, it is only correct to state that the object is negatively charged

Answer:

The answer should be A) 0m/s

Explanation:

It is stopped on the train tracks therefore it is not moving.

Please tell me if I am wrong because I'm not 100% sure on this. Hope it's right and that it helped you.

Answer:

C. A heat engine must deposit some energy in a cold reservoir.

Explanation:

The second law of thermodynamics says that "It is impossible to extract an amount of heat Q from a hot reservoir and use it all to do work W. Some amount of heat q must be exhausted to a cold reservoir."

This means that if we extract an amount of heat Q from the hot reservoir, the work W can never be exactly equal to Q, then there is a surplus of heat q that must be deposited in a cold reservoir.

Then we have the equation:

Q = W + q

From this we can conclude that the correct option is:

C. A heat engine must deposit some energy in a cold reservoir.

There will be always some energy that is not transformed into work, and is deposited in a cold reservoir.

C. A heat engine must deposit some energy in a cold reservoir.

Therefore, option C is correct.

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Answer:

Explanation:

gauge pressure due to a liquid column of density d and height h is given by the following expression .

P = hdg

The pressure depends upon height of liquid column and not on the cross sectional area .

In first cylinder .

gauge pressure = .40 atm

hdg = .40 atm

cross sectional area of cylinder = π r²

The radius of second cylinder is twice of the first , cross sectional area will be 4 times .

The volume remains the same when the liquid is poured into second cylinder

volume = cross sectional area x height .

As cross sectional area of second cylinder is 4 times  , height of liquid column in second cylinder = h / 4 .

gauge pressure in second cylinder = h / 4 x d x g = hdg / 4

.40 / 4 = .10 atm

gauge pressure in second cylinder  = .10 atm.

Answer:

Our average speed was 50 mph

Explanation:

Constant Speed Motion

An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.

Expressed in a simple equation, we have:

[tex]\displaystyle v=\frac{d}{t}[/tex]

The distance we had to drive is d=150 miles. If we left at 1 p.m. and got to the hotel at 4 p.m. This means we took t=3 hours to get there.

The average speed is:

[tex]\displaystyle v=\frac{150\ miles}{3\ h}[/tex]

[tex]v=50\ mi/h[/tex]

Our average speed was 50 mph

Answer:

Data

Explanation:

Data is factual information not subject to bias.

This ultimately implies that, data connotes fact, thus, it is an information that is credible, accurate, a statement of truth, evidential and proven.

In Computer programming, a data dictionary can be defined as a centralized collection of information on a specific data such as attributes, names, fields and definitions that are being used in a computer database system.

In a data dictionary, data elements are combined into records, which are meaningful combinations of data elements that are included in data flows or retained in data stores.

This ultimately implies that, a data dictionary found in a computer database system typically contains the records about all the data elements (objects) such as data relationships with other elements, ownership, type, size, primary keys etc. This records are stored and communicated to other data when required or needed.

Answer: b. Electrons move from glass to silk

Explanation:

When the glass rod is rub over against the silk, the glass loses the electrons due to the physical contact with the silk and the friction so produced.  The surface of the glass becomes positively charged and the surface of the silk becomes negatively charged. As the surface of the glass loses electrons which are accepted by the silk surface.

Answer:

C. The sum remains the same.

Explanation:

The sum of the kinetic and potential energy remains the same as the all rolls from point A to E.

We know this based on the law of conservation of energy that is in play within the system.

The law of conservation of energy states that "energy is neither created nor destroyed within a system but transformed from one form to another".

Explanation:

Momentum is conserved in the collision. Momentum is conserved for any interaction between two objects occurring in an isolated system.

Answer:

742.3N

Explanation:

Given parameters:

Distance  = 39m

Mass 1  = 9.2 x 10⁷kg

Mass 2  = 1.84 x 10⁸kg

Unknown:

Gravitational force between the ships  = ?

Solution:

To solve this problem, we apply the newton's law of universal gravitation:

            Fg  = [tex]\frac{G x mass 1 x mass 2}{r^{2} }[/tex]  

G is the universal gravitation constant  = 6.67 x 10⁻¹¹

r is the distance or separation

   Fg  = [tex]\frac{6.67 x 10^{-11} x 9.2 x 10^{7} x 1.84 x 10^{8} }{39^{2} }[/tex]   = 742.3N

Answer:

6.75233 h

Explanation:

✓airplane travels 3100km at a speed of 790km/h,

Speed= distance/ time

Time= speed/distance

Distance=3100 km

Speed=790km/h

Time= 3100 /790

= 3.924 h

✓and then encounters a tailwind that boosts its speed to 990km/h for the next 2800 km

Time= 2800 k990km/h

= 2800/990

= 2.828 h

We can calculate total times as (3.924 + 2.828)

= 6.75233 h

Answer:

wastes

Explanation:

Each of your kidneys is made up of about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and removes wastes.

Answer:

sweat

Explanation:

Answer:

The earth, The sun, the solar system and the milky way.

Answer:

0.025J

Explanation:

Kinetic energy = ½ × Mass × velocity²

0.20÷1000=0.0002

½ × 0.0002 × 15.8²=0.024964J