50 POINTS!!! PLEASE ANSWER CORRECTLY!
Who patented the first radio transmitter?

A.) Maxwell

B.) Hertz

C.) Tesla

D.) Watson-Watt

(This is so stu.pid because Marconi invented it but my science teacher doesn't uNdErStAnD that -.-)

Answers

Answer 1
Guglielmo Marconi invented the first radio transmitter.

Since he is not one of the options, I would go with B. Hertz.

Marconi started his research after Hertz’s experiments and work in electromagnetic waves.

Related Questions

2. Using the solar system data in the
reference table, rank the following
pairs of planets according to the
gravitational force they exert on
each other, from least to greatest.
Specifically indicate any ties.
Mass. Average radius
(kgÅ~1024). (mÅ~106)
Mercury. 0.330. 2.44
Venus 4.87 6.05
Earth 5.97 6.38
Jupiter 1899 71.5
Saturn 569 60.3

A. Mercury and Venus, when
5.0Å~107 km apart

B. Jupiter and Saturn, when
6.6Å~108 km apart

C. Jupiter and Earth, when
6.3Å~108 km apart

D. Mercury and Earth, when
9.2Å~107 km apart

E. Jupiter and Mercury, when
7.2Å~108 km apart

Answers

Answer:

I'm pretty sure the answer would be C.

When the car engine is working normally, 2 kg of coolant passes through the radiator each second. The temperature of the coolant falls from 112 °C to 97 °C. Calculate the energy transferred each second from the coolant. Specific heat capacity of the coolant = 3800 J/kg °C

Answers

Answer: 114 kJ/s

Explanation: Q = mcΔT = 2 kg · 3800 J/(kg C) ·15 C

GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 20pts-

Answers

Answer:

b,c and d

Explanation:

Does anyone know 19 and 20 ??

Answers

B I think for 19 and D for 20

A car traveling towards east at 40 m/s and turns towards left and travels at same speed. The change in velocity is

Answers

Answer:

Explanation:

In physics the term velocity is always a vector.  All that means is that it's got a direction with it.  which also means this vehicle that was traveling in the east direction and then turned left is and is now ,  maybe traveling in a north direction.  Making the guesses that the car was traveling due East and is now traveling due North, then the car has changed it's velocity by 40 m/s.  By The Way do you happen to know how fast 40 m/s is?  it's about 144 Kph  :0  or about 90 MPH    so this guy is also speeding  :D,  write him a ticket ... :P

Chemical reactions and nuclear reactions cause matter to change in different ways. Which two statements describe how matter changes only in a nuclear reaction? PLZZZ HELP ME ASAP!!
A.) Each atomic nucleus changes
B.) The electrons of atoms are rearranged
C.) No new elements are formed
D.) Atoms of new elements are formed

Answers

Answer:

Explanation:

A and D was the right answer for me.

The two statements describe how matter changes only in a nuclear reaction are each atomic nucleus changes and atoms of new elements are formed.

What is nuclear reaction?

Nuclear reactions is the nuclei transformation process in which one or more nuclides are produced from the collisions between an atomic nucleus and a subatomic particle (neutrons or protons)

In this reaction, the nucleus changes because, the number of protons or neutron decreases. New element with new atomic number and nucleus is formed.

Thus, the correct option is A and  D.

Learn more about Nuclear reaction.

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How much kinetic energy does a 2 kg ball have if it is going 5 m/s ?

Answers

Explanation:

mass(m)=2 kg

velocity(v)=5m/s

Now,

Kinetic energy(K.E.)=1/2mvsq

=1/2×2×5sq

=25

where,sq=square(2)

How does this relate to Newton's second law?
Two balls with different weights (tennis ball and basket ball) are dropped from the same height to see which one will land first

Answers

Answer:

In ideal case, when no resistive forces are present then both the balls will reach the ground simultaneously. This is because acceleration due to gravity is independent of mass of the falling object. i.e. g = GM/R² where G = 6.67×10²³ Nm²/kg², M = mass of earth and R is radius of earth.

Let us assume that both are metallic balls. In such case, we have to take into account the magnetic field of earth (which will give rise to eddy currents, and these eddy currents will be more, if surface area will be more) and viscous drag of air ( viscous drag is proportional to radius of falling ball), then bigger ball will take slightly more time than the smaller ball.

Explanation:

In ideal case, when no resistive forces are present then both the balls will reach the ground simultaneously. This is because acceleration due to gravity is independent of mass of the falling object. i.e. g = GM/R² where G = 6.67×10²³ Nm²/kg², M = mass of earth and R is radius of earth.

Let us assume that both are metallic balls. In such case, we have to take into account the magnetic field of earth (which will give rise to eddy currents, and these eddy currents will be more, if surface area will be more) and viscous drag of air ( viscous drag is proportional to radius of falling ball), then bigger ball will take slightly more time than the smaller ball.

WILL GIVE BRANLIEST
can you find a magnet with only a north pole? why or why not?

Answers

no you can’t because north and south attract eachother

Which statements did both Aristotle and Ptolemy assume? Select two options.

The Sun was the center of the solar system.
Bodies in space traveled in circles.
Epicycles explained the “looping” movement of the planets.
The planets revolved around the Earth.
The stars in the sky are other suns.

Answers

Answer:

Bodies in space traveled in circles.

The planets revolved around the Earth.

Explanation:

Answer:  b and d

Explanation:

got it right

In the example of a hammer hitting a nail, which is hit harder? the nail, the hammer, or they both hit equally?

Answers

Answer:

both hit qaulity

Explanation:

Newton's Third Law says that every interaction involves two forces - in this case (1) hammer pushes nail, and (2) nail pushes hammer. When a hammer hits a nail, Newton's Third Law says that the force that the hammer exerts on the nail is exactly the same size as the force the nail exerts on the hammer.

GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 20pts-

Answers

Answer:

B

Explanation:

inside of a balloon is gas so it has room to move freely

A 700 kg car going 12 m/s speeds up to 30.6 m/s in 7 seconds. How much work was done to increase its speed?

Answers

Answer:

Approximately [tex]2.8 \times 10^{5} \; \rm J[/tex] (assuming that the car is moving on level ground, and that there is no friction to hinder the motion of the car.)

Explanation:

Formula for the kinetic energy, [tex]\rm KE[/tex], of an object of [tex]m[/tex] travelling at velocity [tex]v[/tex]:

[tex]\displaystyle \text{KE} = \frac{1}{2}\, m \cdot v^{2}[/tex].

Let [tex]v_1[/tex] and [tex]v_2[/tex] denote the velocity of this car before and after the acceleration.

Kinetic energy of this car before the acceleration:

[tex]\begin{aligned}\text{KE}_1 &= \frac{1}{2}\, m \cdot {v_1}^{2} \\ &= \frac{1}{2} \times 700\; \rm kg \times (12\; \rm m \cdot s^{-1})^{2} \\ &\approx 5.0 \times 10^{4}\; \rm J\end{aligned}[/tex].

Kinetic energy of this car after the acceleration:

[tex]\begin{aligned}\text{KE}_2 &= \frac{1}{2}\, m \cdot {v_2}^{2} \\ &= \frac{1}{2} \times 700\; \rm kg \times (30.6\; \rm m \cdot s^{-1})^{2} \\ &\approx 3.3\times 10^{6}\; \rm J\end{aligned}[/tex].

Assume that this car was travelling on level ground. Also assume that there is no friction to hinder the motion of this car. The work of the engine of this car  would be equal to the amount of [tex]\rm KE[/tex] that the car has gained:

[tex]\rm KE_2 - KE_1 \approx 2.8\times 10^{5}\; \rm J[/tex].

Which of the following effects results from the interference of two sound
waves that have slightly different frequencies?
A. Beats
B. Intensity
C. Loudness
D. Echoes
SUBMI

Answers

Answer:beats

Explanation:l got it right gang

Beats effects results from the interference of two sound waves that have slightly different frequencies.

What is beats?

Beats are produced by the superposition of two waves of slightly different frequencies but identical amplitudes. The waves alternate in time between constructive interference and destructive interference, giving the resulting wave a time-varying amplitude.

To learn more about Sound waves here

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The properties of metals depend mainly on the number and arrangement of neutrons
True
False

Answers

Answer:

False

Explanation:

Electrons

john and kate live in the regions marked on the map. john experiences severe winters, with snowstorms and blizzards. in contrast, kate hardly ever experiences temperatures near or below freezing. which of the following statements explain the climate differences in these locations??

Answers

Answer:

A. Kate’s location is at a lower latitude.

C. Kate’s location absorbs sunlight that travels a shorter distance through the atmosphere.

Explanation:

^

Answer:

edmentum :-))

Explanation:

Calculate the weight(W) of a 40 Kg bowling ball?
W = m(Kg) x g (9.8 m/s2)

Answers

Answer:

392 N

Explanation:

Mass of the ball=40kg

g=9.8m/s^2

Weight(w)=40×9.8

=392N

7. It takes 1 second to hear the reflection of a loud noise made in front of a large barrier. If
the speed of sound in air is 340 m/s, how far away is the barrier?
A. 85 m
B. 170 m
C. 340 m
D. 680 m

Answers

Answer:

C 340 m

Explanation:

may i be marked brainliest?

A negative charge of 4.0 x 10 C and a positive charge of 7.0 x 10 C are separated by 0.15 m. What is
the force between the two charges?

Answers

Answer:

112×10^12N

Explanation:

We use the following equation to find the force between two charges that are away from each other at a particular distance:

F=k×q1×q2/r^2 F=9×10^9×4×10×7×10/(0.15)^2 F=252×10^11/0.225 F=1120×10^11=112×10^12

Which event occurs during high tide?

All of Earth’s ocean levels rise.
The moon’s orbit is closer to Earth.
The gravity of the Sun and moon cause the Earth’s crust and water to bulge.
Earth’s crust and water are being pulled in opposite directions by the Sun and moon.

Answers

Answer:

(B) The moon’s orbit is closer to Earth.

Explanation:

Answer:

B

Explanation:

Which can cause physical weathering of rock?

A acid
B oxygen
C sun
D wind

Answers

Answer:

D wind

Explanation:

Heavy winds may cause much  damage to the Earth along with rain and extreme temperature changes.

NHT0015
16. A metal rod is heated increasing its temperature
by 10°C. The fractional change in its length is
1 *10-4. If a plate of same metal is heated raising
its temperature by 5°C, the fractional change in
its area will be .-
(1) 1 x 10-4
(2) 0.5 x 10-4
(3) 2 x 10-4
(4) 3 x 10-4​

Answers

Answer:

(1) 1×10⁻⁴

Explanation:

From the question,

α = (ΔL/L)/(ΔT)............. Equation 1

Where α = linear expansivity of the metal plate, ΔL/L = Fractional change in Length, ΔT = Rise in temperature.

Given: ΔL/L = 1×10⁻⁴, ΔT = 10°C

Substitute these values into equation 1

α  = 1×10⁻⁴/10

α = 1×10⁻⁵ °C⁻¹ .

β = (ΔA/A)/ΔT................... Equation 2

Where β = Coefficient of Area expansivity, ΔA/A = Fractional change in area.

make ΔA/A the subject of the equation

ΔA/A = β×ΔT.......................... Equation 3

But,

β = 2α.......................... Equation 4

Substitute equation 4 into equation 3

ΔA/A = 2α×ΔT................ Equation 5

Given: ΔT = 5°C, α = 1×10⁻⁵ °C⁻¹

Substitute into equation 5

ΔA/A = ( 2)×(1×10⁻⁵)×(5)

ΔA/A  = 10×10⁻⁵

ΔA/A  = 1×10⁻⁴

Hence the right option is (1) 1×10⁻⁴

Two charges are separated by a distance r. The distance between the charges is tripled to 3r. If the original force between the charges was 45N what is the new force between the charges A.5N B.15N C.75N D.135N

Answers

Answer:

5N

Explanation:

The formula formula for calculating the force between charges is expressed as;

F = kq1q2/r²

If two charges are separated by a distance r and a force between  them is 45N, then;

45 = kq1q2/r² ....1

If the distance between the charges is tripled to 3r, then;

F = kq1q2/(3r)²

F = kq1q2/9r² ... 2

Divide both expressions

45/F = (kq1q2/r²)/(kq1q2/9r²)

45/F = kq1q2/r² * 9r²/kq1q2

45/F = 9

9F = 45

F = 45/9

F = 5N

Hence the new force between them will be 5N


A ray of light strikes a plane mirror at an angle of incidence equal to 35°. The angle between
the incident ray and the reflected ray is
A)
70°
B)

C)
55°
D)
35°

Answers

Answer:

55 degrees

Explanation:

A ray of light strikes a plane mirror at an angle of incidence. The angle between the incident ray and the reflected ray is 70°. The correct option is A.

What is law of reflection?

The law states that angle of incidence of the incident ray is equal to the angle of reflection through a plane surface.

Here, angle of incidence of light on a plane mirror is 35°, then the angle of reflection will also be 35°.

i = r = 35°

Then the angle between the incident ray and the reflected ray will be

i +r = 35 + 35 =70°

Thus, the correct option is A.

Learn more about law of reflection.

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¿Cuál es la formula para resolver la caída libre?

Answers

Caída Libre

h= v0 t+1/2 g t2

vf = v0 + g t

?

6. Fig. 3.1 shows a pond that is kept at a conslant depth by a pressure-operated valve in the
base.
water
pressure oporated
va
outlet
spring
Fig. 3.1
(a) The pond is kept at a depth of 2.0m. The density of water is 1000 kam
Calculate the water pressure on the valve.
A. 20 Pa
B.
20000 Pa
o 10000 Pa
D. 100 Pa​

Answers

Answer: I didnt understand it sorrryryyyyyyy

Explanation:

I have no questions.

Answers

Answer: happy Ramadan

Explanation: thanks

What is destructive interference?

a) Occurs when the crest of one wave meets the trough of another wave as they travel from two different points in the same direction and at the same frequency.

b) Occurs when the crest of one wave stays separate from another wave and they continue moving in their original direction.

Answer quickly, please!

Answers

a.............,,,..,.,.,.,.,.,,,,,,,,,’

Answer:

a

Explanation:

occurs when the crest of one wave meets the trough of another wave as they travel from two different points in the same direction and at the same frequency

A factory has 1200 workers of which 720 are male and the rast are female what percent of workers are female​

Answers

Answer:

Percent of Female Workers = 40%

Explanation:

The percentage of the female workers in the given group of workers can be easily found by the following formula:

[tex]Percent\ of\ Female\ Workers = \frac{No.\ of\ Female\ Workers}{Total\ No.\ of\ Workers}\ x\ 100\%[/tex]

where,

Total No. of Workers = 1200

No. of Female Workers = Total Workers - No. of Male Workers

No. of Female Workers = 1200 - 720 = 480

Therefore,

[tex]Percent\ of\ Female\ Workers = \frac{480}{1200}\ x\ 100\%[/tex]

Percent of Female Workers = 40%

After the full moon, the moon begins its shrinking or_phases. During these phases, the light side of the moon is on the_
A. Waning, left
B. Waxing, right
C. Waxing, left
D. Waning, right

Answers

I believe the answer is b
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