QUESTION 3

When completing a scientific investigation, you will know your results are reliable when you are able to

duplicate your results

communicate your results

evaluate your results.

Newton's second law for an object's motion in one spatial dimension:

F = ma

F is the net force acting on the object, m is the object's mass, and a is the object's acceleration.

Given values:

F = 20N

a = 50m/s²

Plug in these values and solve for m:

20 = m(50)

m = 0.4kg

Choice C

Using Newton's Second Law of Motion, the mass of the object is calculated as 0.4 kg by dividing the force (20 N) by the acceleration (50 m/s²), corresponding to option C.

The question is asking to determine the mass of the object based on the given force and acceleration using Newton's Second Law of Motion. According to Newton's Second Law, Force (F) equals mass (m) times acceleration (a), which is expressed as F = m * a. To find the mass, we rearrange the equation to m = F / a.

In this case, the force (F) is 20 Newtons (N), and the acceleration (a) is 50 meters per second squared (m/s²). Plugging these values into the equation, we get:

m = F / a = 20 N / 50 m/s² = 0.4 kg

Therefore, the mass of the object is 0.4 kg, which corresponds to option C.

Answer:

A. 0.012 Watts

Explanation:

P = IV = I² R

Given I = 0.02 A and R = 30 Ω:

P = (0.02)² (30)

P = 0.012 W

The power in an electrical circuit is given by the equation P= PR, the power in the circuit is 0.6 watts. The correct option is D.

In physics and electrical circuits, power refers to the rate at which work is done or energy is conveyed. It quantifies the rate at which energy is used or generated in a system.

The power in an electrical circuit may be calculated using the equation P = I * R, where P is the power, I is the current flowing through the circuit, and R is the circuit's resistance.

The current (I) is 0.02 amps in this example, while the resistance (R) is 30 ohms.

P = I * V

P = 0.02 A * 30 Ω

P = 0.6 watts

Therefore, the power in the circuit is 0.6 watts.

Thus, the correct answer is D. 0.6 watts.

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We have that the beam of light that emerges from water into air at an angle that  bends

Away from the normal

Option B is correct

Normal of a Plane

In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object. The normal line to a plane curve at a given point is the line perpendicular to the tangent line to the curve at the point.

Therefore it is seen From the Question Image that

The Beam is NOT bent

But Rather

Away from the normal.

In conclusion

The beam of light that emerges from water into air at an angle that  bends

Away from the normal

Option B is correct

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Explanation:

if two vectors are perpendicular to each other then thier dot product is equal to zero so (2i+3j+8k).(-4i+4j+ak)=0 (2)(-4) +(3)(4)+(8)(a) =0 -8+12+8a=0 4+8a=0 8a=-4

[tex]a = \frac{ - 4}{8} [/tex]

[tex]a = \frac{ - 1}{2} [/tex]

Answer:

the Third option

Explanation:

Answer:

It will decrease to one-sixth the original force.

Explanation:

The electrical force is given by :

[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]..............(1)

Where

k is the electrostatic constant

r is the distance between charges

One charge is decreased to one-third of its original value,  and a second charge is decreased to one-half of its  original value.

i.e. [tex]q_1'=\dfrac{q_1}{3}[/tex]

and [tex]q_2'=\dfrac{q_2}{2}[/tex]

New force is given by :

[tex]F'=k\dfrac{q_1q_2}{6r^2}[/tex]

[tex]F'=\dfrac{F}{6}[/tex]

So, the new force will decrease to one-sixth the original force. Hence, the correct option is (c).

Answer:

C. has no effect on validity

Explanation:

Repeating your experiment has no effect on validity.

It doesn't matter how many times you repeat your experiment. You have to find the average outcome of each experiment you do.

Answer:

C

Explanation:

The mechanical advantage is always less than 1 because the force needed to move an object is always greater than the weight of the object.

Answer:

It is always less than 1.

Explanation:

Answer:

D. Asthenosphere

Explanation:

The asthenosphere is relatively plastic part of the mantle which underlies the brittle lithosphere. In the asthenosphere, it is generally believed that the rocks are in ductile state and easily moves. It is the site of convection within the earth. In mantle convection, hot and light materials rises and keeps moving into upper crustal levels till they solidify. Here also, cold and denser materials sinks deeper till they turn to melt. This differences in temperature and density sets up a convective cell within the mantle. Several convective cells are in the mantle.

Explanation:

Evaluate in the x direction to find the time it takes to land:

x = x₀ + v₀ₓ t + ½ aₓ t²

17.5 = 0 + (15 cos 40) t + ½ (0) t²

t = 1.52

Evaluate in the y direction to find the initial height:

y = y₀ + v₀ᵧ t + ½ g t²

0 = h + (15 sin 40) (1.52) + ½ (-9.8) (1.52)²

h = -3.32

The cliff is actually 3.32 meters below where it lands.  Make sure you copied the problem correctly.

True, scientists often talk to each other to figure out if their results were similar and what they could have done better.

Although, talking to other scientists does have risks, other scientists could copy your work and further better it.

So, your final answer is TRUE, sorry for the long answer, I needed to have a word count about 20 characters and then I got carried away! lol

Negative celestial declinations are all positions in the sky that are directly over south surface latitudes.

Sirius is SOUTH of the celestial equator.

During the course of a year, it traces a circular path directly over the parallel of 16° South latitude, taking it over Peru, La Paz in Bolivia, St. Helena island in the Atlantic, Namibia, Angola, Zambia, Mozambique, Malawi, Madagascar, Australia, French Polynesia, American Samoa, and the Pacific Ocean.

Answer:

Sirius is *SOUTH* of the celestial equator :))

Explanation:

its the correct answer on the test,,, good luck !! :3

Answer:

The step down transformer reduces this voltage to 6 volts. The string wire of the sonometer is a non-magnetic metallic wire like brass or copper. A horse shoe magnet is placed at the middle of the sonometer wire so that the magnetic field is applied perpendicular to the sonometer wire in a horizontal plane.

Hope this helps!

In a sonometer, the purpose of a magnet is to create a magnetic field that interacts with an electrically charged wire to induce vibrations and produce sound.

The purpose of a magnet in a sonometer is to provide a magnetic field which can interact with an electric current through a wire or a strip that is stretched across the sonometer. When alternating current flows through the wire, it oscillates due to the magnetic force exerted by the magnet. This magnetic interaction causes the wire to vibrate, producing sound waves whose frequencies are related to the tension, length, and mass per unit length of the wire.

Understanding the influence of geometric considerations and background contributions is critical for accurate measurements. A magnetometer with a second-order gradiometer design minimizes background noise and stray field effects, essential for precise studies. In this context, the sonometer can serve as a demonstrative tool for such magnetic field sensors.

Answer:

the branch of mechanics that deals with the motion of air and other gases and with the effects of such motion on bodies in the medium.Compare aerostatics(def 1).

Explanation:

Answer:

Aerodynamics is the way air moves around things.

Answer:

b. 20 sec

Explanation:

y = y₀ + v₀ t + ½ g t²

0 = 0 + (100) t + ½ (-10) t²

0 = 100t − 5t²

0 = t (100 − 5t)

t = 0, t = 20

The body lands after 20 seconds.

Yes, scientific method can be applied on many everyday activities to get a reasonable solution. Infact normally we are applying this method without having it in our knowledge that we are applying it.

For example: In morning we are going to office and we start the car, but it is not started.You turn the engine again and again but it simply donot works.

Observation (the state of defining a problem):

The car is not started

Hypothesis (A possible solution based on the information we already know):

The car is not started because it might be out of gas or there can be some other technical fault.  

Experiment (testing of hypothesis by applying different methods of solving problem):

You get the fuel and put it inside the car but it still donot works and car didnot start. Experiment didnot get solution.

Analyze the results of data and test another hypothesis

You call a technician and he check with the car engine tries and finds out that the engine was out of order and needs repairing.

Draw conclusion:

The engine do not works when it is out of order and it is a cause of a car not being started.

Now the theory and law making part can not be applied on this case but it is a part of scientific method.

Hope it helps!

Answer:

A. Splitting water into hydrogen and oxygen.

Explanation:

A chemical change produces a new substance. ... A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes.

Splitting water into hydrogen and oxygen.

Answer:

Explanation:

You add resistances to get the total R in a series circuit.

R =  R1 + R2 + R3

R = 8 + 12 + 28

R = 48 ohms.

Next the current is the same going through each of the resistors.

I = E / R

I = 24 / 48

I = 1/2

I = 0.5

But you are asked for power in each resistor

P = I * I*R

P = I^2 * R1

P1 = (0.5^2) * 8

P1 = 1/4 * 8 = 2 watts

P2 = I^2 * R2

P2 = (1/2)^2 * 12

P2 = 3 watts

P3 = 1/4 * 28

P3 = 7 watts.

=====================

The total power can be found two ways: either by just adding what you got or using voltage.

P = E * I

P = 24 * 1/2 = 12 watts.

Now we can try it the other way.

P = P1 + P2 + P3

P = 2 + 3 + 7

P = 12 watts

Both answers agree.

Answer:

Power in R1 = 2 watts

Power in R2 = 3 watts

Power in R3 = 7 watts

Compute the total power delivered to the circuit by the 24-volt battery:  12 watts

Average speed is total distance traveled divided by time. It is a scalar quantity (just magnitude).

Average velocity is displacement divided by time. It is a vector quantity (magnitude and direction).

An average velocity is different from average speed as average velocity is calculated using total displacement and total time into consideration.

Explanation:

The average velocity is calculated using the total displacement and total time, whereas the average speed is calculated using the total distance and total time.

“Average velocity is a vector quantity” and thus takes the magnitude and direction of vector displacement in calculation. Average speed is scalar quantity.

[tex]\text {Average velocity}=\frac{\text {Total displacement}}{\text {Total time}}[/tex]

Answer:

I think it's self inductance, but without knowing the options I'm not certain.

Answer:

induction

Explanation:

1. distance plus direction

displacement

2. 30 m/s northwest, for example

velocity

3. total distance divided by total time

average speed

4. what an object going around a curve at a constant speed is

undergoing

acceleration

5. 30 m/s, for example

speed

6. any non-directional quantity

scalar

The given terms are matched with their respective definitions as follows,

The distance plus direction is known as displacement, 30 meters / second northwest is an example of the velocity,  total distance divided by the total time then an object going around a curve at a constant speed is undergoing acceleration.

Displacement describes this shift in location.

1. distance plus direction ⇒⇒displacement

2. 30 m/s northwest, for example, ⇒⇒velocity

3. Total distance divided by the total time ⇒⇒average speed

4. An object going around a curve at a constant speed undergoing ⇒⇒acceleration

5. 30 m/s, for example, ⇒⇒speed

6. Any non-directional quantity ⇒⇒ scalar

Thus, An object traveling around a curve at a constant speed experiences acceleration. Distance plus direction is known as displacement, and 30 meters per second to the northwest is an example of velocity.

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Explanation:

Centripetal acceleration = acceleration due to gravity

v² / r = GM / r²

Solving for velocity:

v = √(GM / r)

Given:

G = 6.67×10⁻¹¹ m³/kg/s²

M = 5.97×10²⁴ kg

r = 6.38×10⁸ m + 1.44×10⁹ m = 2.078×10⁹ m

v = √(6.67×10⁻¹¹ × 5.97×10²⁴ / 2.078×10⁹)

v = 438 m/s

Period is the time to travel one circumference:

T = 2πr / v

T = 2π (2.078×10⁹) / 438

T = 2.98×10⁷ s

T = 8290 hr

T = 345 days

Answer:

1. 31 Ω

2. 42 Ω

3. V = IR

4. 4 A

5. 1.37 A

Explanation:

Sorry if I make any mistakes reading your handwriting.  If I do, let me know and I'll fix it.

1.  "Resistors of 5Ω, 10Ω, and 16Ω are connected in series.  Find the total resistance."

The resistance of resistors in series is the sum:

R = R₁ + R₂ + R₃

R = 5Ω + 10Ω + 16Ω

R = 31Ω

2.  "The total resistance of two resistors connected in series is 75Ω.  The value of one resistor is 33Ω.  What is the value of the other one?"

Since they are in series, the total resistance is the sum:

75Ω = 33Ω + R

R = 42Ω

3. "State Ohm's law."

Ohm's law states that a voltage drop across a resistor is equal to the resistance times the current.

V = IR

4. To find the current, we first find the total resistance, then use Ohm's law.

R = 10Ω + 15Ω + 30Ω

R = 55Ω

V = IR

220 V = I × 55Ω

I = 4 A

5. Same steps as before.

R = 1.5Ω + 4Ω + 12Ω

R = 17.5Ω

V = IR

24 V = I × 17.5Ω

I = 1.37 A

Answer:

25.2

Explanation:

F=KL

L=F/K

L=7.50/0.298

L=25.2M

Answer:

New Moon

The Moon's position in space at New Moon.

New Moon is the first primary phase and it occurs the moment when the Sun and Moon are aligned, with the Sun and Earth on opposite sides of the Moon.

A New Moon cannot normally be seen from Earth since only the dark side of the Moon faces our planet at this point. Sometimes, if the New Moon is close to the Lunar nodes of its path, it can cause a Solar Eclipse.

The greatest difference between high and low tide, also known as spring tides, takes place around New Moon and Full Moon.

Waxing Crescent Moon

The moment a thin sliver of the Moon becomes visible after New Moon is the beginning of the first intermediate phase, the Waxing Crescent Moon.

In the past, this used to be called New Moon while the darkest phase was called Dark Moon. This traditional definition of New Moon is still in use in some cultures, defining the beginning of the months for instance in the Islamic calendar.

The rest of the Moon is also sometimes faintly visible during most of this phase because Earth also reflects sunlight onto the Moon, a phenomenon called earthshine.

First Quarter Moon

First Quarter Moon is the second primary phase.

First Quarter Moon is the second primary Moon phase and it is defined as the moment the Moon has reached the first quarter of its orbit around Earth, hence the name. It is also called Half Moon as we can see exactly 50% of the Moon's surface illuminated. Whether you see the left or right half illuminated, depends on several factors, including your location.

The smallest difference between high and low tide, also known as neap tides, occurs around the 2 Quarter Moons.

Waxing Gibbous Moon

The second intermediate phase, the Waxing Gibbous Moon, lasts until the next primary phase. Waxing means that it is getting bigger. Gibbous refers to the shape, which is larger than the semicircle shape of the Moon at First Quarter, but smaller than a full circle.

Full Moon

Full Moon is the brightest phase.

@timeanddate.com

The Full Moon appears in the night sky when the Sun and the Moon are aligned on opposite sides of Earth.

How can Full Moon be in the daytime?

Technically, this alignment only lasts a moment. However, the Moon can appear to be full a day before or after while more than 98% of the Moon's disc is illuminated.

When a Full Moon occasionally passes through Earth's shadow, it will cause a lunar eclipse.

When the Full Moon comes close to the points of its orbit that are closest or farthest away from Earth, we call it a Supermoon or Micromoon, respectively.

What is the Moon Illusion?

Waning Gibbous Moon

The next intermediate Moon phase is the Waning Gibbous Moon. The portion of the visible half of the Moon illuminated decreases during this period.

Third Quarter Moon

Third Quarter Moon is the last primary phase.

The Third Quarter Moon occurs the moment the opposite half of the Moon is illuminated compared to the First Quarter Moon.

Waning Crescent Moon

The Waning Crescent Moon. The Sun illuminates less than half of the visible part of the Moon during this Moon phase and you can sometimes see earthshine on the rest of the Moon towards the end.

Explanation:

Answer:

The new Moon appears during a period when the earth, the Moon,  and the Sun are all in a single line. Since the Moon is in between the Sun ad the Earth , the side of the Moon that directly facing the Earth is dark.

During full Moon, the three bodies  are also approximately in a line, but  the moon at this stage is on the other side of earth, so the Sun lights up the the section of the earth facing it.

At first quarter and last quarter, the Moon is located at a position perpendicular to a line between Earth and the Sun. one section of the moon is dark while the other will be brightened

Crescent refers to phases where the less than half of the moon is illuminated while gibbous is the phase where  more than half of the moon is illuminated.

After the new Moon phase, The waxing crescent is visible due to exposure some reflected sunlight rays . The lunar crescent continue to grow until first-quarter Moon. As the right section of the Moon extend to more than half of the Moon's face, the Moon becomes waxing gibbous.

Then, right after the full Moon, the right section begins to reduce again to make a waning gibbous and which then turn into a third-quarter Moon. The exposure to sunlight continues to lessen until the moon is a waning crescent and then a new Moon. The full cycle is carried out in  29.5 days.

Answer:

0.0979 kg/m³

Explanation:

Treating air as an ideal gas:

PV = nRT

n/V = P/RT

Density depends on both pressure and temperature.  If we assume the temperature is constant, we can say that density is directly proportional to pressure.

ρ = kP

ρ/P = k

Writing a proportion:

(1.26 kg/m³) / (7720 mmHg) = ρ / (600 mmHg)

ρ = 0.0979 kg/m³

Answer:

[tex]\rho = 0.098 kg/m^3[/tex]

Explanation:

As we know that for ideal gas we will have

[tex]PV = nRT[/tex]

here we can convert it into the form of density

[tex]PV = \frac{m}{M}RT[/tex]

now we have

[tex]PM = \rho RT[/tex]

now if the temperature will remain constant then in that case

[tex]\frac{P}{\rho} = constant[/tex]

so we will have

[tex]\frac{P_1}{P_2} = \frac{\rho_1}{\rho_2}[/tex]

here we can plug in all values in it

[tex]\frac{7720}{600} = \frac{1.26}{\rho}[/tex]

now we have

[tex]\rho = \frac{600}{7720}(1.26)[/tex]

[tex]\rho = 0.098 kg/m^3[/tex]

Answer:

0.52 m/s

Explanation:

Energy is conserved.

Initial kinetic energy + initial potential energy = final kinetic energy + final potential energy

½ m v₁² + ½ k x₁² = ½ m v₂² + ½ k x₂²

m v₁² + k x₁² = m v₂² + k x₂²

Given:

m = 1.3 kg

k = 52 N/m

v₁ = 0.28 m/s

x₁ = 0.081 m

x₂ = 0.081 m / 2 = 0.0405 m

(1.3) (0.28)² + (52) (0.081)² = (1.3) v² + (52) (0.0405)²

v = 0.52

The velocity halfway to the equilibrium position is 0.52 m/s.

Answer:

X-rays

Gamma rays

Explanation:

The electromagnetic waves are arranged in order of their frequencies and wavelengths. This arrangement forms the electromagnetic spectrum. The x-rays and gamma rays form the part of the spectrum with highest frequencies and least wavelength. In the order of decreasing frequency and increasing wavelength, we start with Gamma rays ,x-rays uv, Visible light, Infrared light,Microwave then radio waves.

Answer:

X rays and Gamma rays.

Explanation:

The electromagnetic waves are arranged in the increasing frequency and energy  while decreasing wavelength. So the waves on the right side of ultraviolet spectrum having higher frequency and energy and lower wave length. such as X RAYS AND GAMMA RAYS. Electromagnetic wave spectrum is arranged as.

Radio waves,  microwaves,  infrared waves,  visible rays, ultraviolet waves,  x rays, gamma rays.

Answer:

A

is answer

because of questions

Answer:

D. A football thrown upward at an angle.        

Explanation:

When an object is thrown in space, it is known as projectile and its motion is known as projectile motion. 1 dimensional motion refers to the motion either in horizontal or vertical direction. 2-dimensional motion refers to the motion in both horizontal and vertical direction. A football thrown at an angle will have constant horizontal velocity and accelerated motion in vertical direction. Thus, it is an example of projectile motion as well as two-dimensional motion.

Answer:

0

Explanation:

Forces with equal magnitudes and opposite directions cancel each other out, so the net force is 0.

Answer:

0

Explanation:

when you try to give two equal force on object in opposite side, the object will not move.hence the net force will be zero

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