what is best for a scientist to base a hypothesis

Answer:

b

Explanation:

Answer:

5000J

Explanation:

hope this helps you

Answer:

Dorsal side:B

Ventral side:D

Anterior end:A

Posterior end:C

Explanation:

The four regions of the earthworm are, A is the anterior end,B is the dorsal side, C is the posterior end, and D is the ventral side.

Earthworms are common soil dwellers who are both safe and useful. Earthworms help plants flourish by collapsing dead and decaying organic debris into rich humus soil.

They also aerate the soil and enhance flow by digging small canals and holes.

The four regions of the earthworm are;

A is the Anterior end

B is the Dorsal side

C is the Posterior end

D is the Ventral side

Hence all the regions are clearly defined with the help of digrame.

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Answer:

3.33m/s

Explanation:

Speed is the change in distance of a body with respect to time.

Speed = Distance/Time

Given

Distance = 1100m

Time = 330s

Speed = 1100/330

Speed = 3.33m/s

Hence her average speed in m/s is 3.33m/s

Answer:

3.33

Explanation:

khan academy

The magnitude of the force which the motorcycle exerts backward on the ground to produce its acceleration can be calculated using Newton's second law of motion. According to Newton's second law, force is equal to mass multiplied by acceleration.

The mass of the motorcycle with the rider is given as 265 kg. Let's assume the acceleration of the motorcycle is a.
that the magnitude of the force which the motorcycle exerts backward on the ground to produce its acceleration is 265 kg multiplied by the acceleration.

According to Newton's second law of motion, the force exerted by an object is directly proportional to its mass and acceleration. In this case, the mass of the motorcycle with the  rider is given as 265 kg. By multiplying the mass by acceleration, we can find the magnitude of the force exerted by the motorcycle.

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Answer:

their ability to conduct electricity

If the heat capacity at constant volume is 30 J / k. the energy change upon heating the system from 200 k to 350 k would be 450 Joules.

It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.

As given in the problem we have to calculate the energy change upon heating the system from 200 k to 350 k, if the heat capacity at constant volume is 30 j/k.

The energy change upon the heating = 30 × (350 -200)

                                                            = 450 Joules

Thus, the energy change upon heating the system from 200 k to 350 k would be 450 Joules.

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Answer:

20km

Explanation:

20km/h means that for every 1h, the car traves 20km. 1h is 60 minutes so for every 60 minutes, the car travels 20km. Thus, it would travel 20km for 60 minutes.

Answer:

the answer is 50......

Explanation:

average speed =total distance/time

=50/2

=25m/hr

Answer:

4200 J/°C/kg

Explanation:

The formula for heat transfer is given by :

Q= m*c*ΔT  where;

Q= heat transferred = 6930 J

m=mass of the liquid = 0.330 kg

c= specific heat capacity=?

ΔT = 25-20 = 5.0°C

Applying the values in the formula as;

Q= m*c*ΔT

6930 = 0.330 * c * 5

6930 = 1.65 c

6930/1.65 = c

4200 = c

c= 4200 J/°C/kg

Answer:

1a: Lead atoms are heavier than aluminum atoms, which means that a given mass of lead contains fewer atoms than the same mass of aluminum. Since the heat required to raise the temperature depends on the number of atoms, it takes less heat to raise the temperature of the lead than the temperature of the aluminum.

Answer:

if the earth stops rotating the value of g increases

Answer:

6

Explanation:

because the numbers before the decimal point are whole numbers so that would mean the 4 & 0 before the points the ones and tens place. and anything behind a decimal goes in order as usual ones,tens,hundredths, thousandths, ten thousandths, and so on. so that what makes the 6 be in the hundredths place.

Answer:

6 is the speed.

Explanation:

Answer:

32 m/s

Explanation:

the formula to find speed is to either multiply the wavelength by the frequency or divide the wavelength by the period. Thus the frequency of 8 times the wavelength of 4 would be 32 meters per second.

Answer:

B generator

Explanation:

When you change the thickness of the wire in a circuit, option B. the resistance (R) and current (I) will also change, but the voltage (V) will remain constant.

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area (thickness). As the thickness of the wire changes, the cross-sectional area changes, which in turn affects the resistance. Thicker wires have a larger cross-sectional area, resulting in lower resistance, while thinner wires have a smaller cross-sectional area, resulting in higher resistance. Therefore, changing the thickness of the wire will cause a change in resistance.

According to Ohm's Law (V = IR), the voltage (V) in a circuit is equal to the product of the current (I) and the resistance (R). If the voltage is kept constant, and the resistance changes due to the thickness of the wire, the current will also change to maintain the relationship defined by Ohm's Law. When the resistance increases, the current decreases, and vice versa.

However, it's important to note that changing the thickness of the wire will not directly affect the voltage. The voltage in a circuit is determined by the power source or the potential difference applied across the circuit and is independent of the wire thickness. As long as the voltage source remains constant, the voltage across the circuit will remain constant regardless of the wire thickness. Therefore, the correct answer is option B.

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Jupiter's moon Io exhibits a high level of geological activity on its surface.Its volcanic eruptions and the dynamic processes at work provide insights into the geological forces operating in extreme environments

Jupiter's moon Io is known for its intense geological activity, making it the most volcanically active object in our solar system. The tidal forces exerted by Jupiter and its other moons cause significant internal heating, resulting in a dynamic and geologically active surface.

Observations by various space missions, including the Voyager and Galileo missions, have revealed hundreds of active volcanoes on Io. These volcanoes spew out plumes of sulfur and other materials, creating a complex network of colorful volcanic features. Some of these eruptions reach heights of up to 300 kilometers (190 miles), far exceeding any volcanic activity on Earth.

The high level of geological activity on Io's surface makes it a fascinating celestial body to study. By studying Io, scientists gain a better understanding of how celestial bodies evolve and the complex interactions between moons and their parent planets.

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Answer:

A satellite.

Explanation:

I got this answer right.

The satellite was the first launched craft during the Space Race. The correct answer would be an option (B)

The space race was a series of technological tests between the United States and the Soviet Union in order to demonstrate dominance in spaceflight. According to an online exhibit from the National Air and Space Museum, it was an offshoot of the mid-twentieth-century Cold War, a violent worldwide war that pitted the philosophies of capitalism and communism against one another (opens in new tab).

The first goal of this "space race" was to launch an unmanned object, a satellite, into orbit around the Earth.

A satellite is an instrument that has been sent into orbit to collect data or to serve as part of a communication system.

Thus, the correct answer would be option (B) satellite was the first launched craft during the Space Race.

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The bulb should be placed on parabolic focus to ensure a perfect beam of light

The point on a parabola known as the parabolic focus is where all parallel light rays are reflected at a single point or when all rays travelling through the focus are reflected parallel to the axis of symmetry. The focus of a parabolic reflector is the location at which the reflected light congregates.

The parabola point is equally spaced from the directrix and the vertex, to use mathematical terminology. An equation for a parabola is presented in standard form. Therefore, a parabola lying sideways and facing right with an extremum of will serve as the visual representation in the given example in Cartesian (2; -3). Given that 13 is the focal parameter, the focus will be at (2+0.5p; -3) or (8,5; -3).

Complete Question:

Gabriella is designing a flashlight that uses a parabolic reflecting mirror and a light source. The shape of the mirror can be modeled by (y+3)^2=26(x-2) where x and y are measured in inches. Where should she place the bulb to ensure a perfect beam of light?

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Answer:

72 km / hour

Explanation:

Speed equals to distance over time. We are given distance equal 360 km and time in 5 hours.

Hence:

\(\displaystyle \large{s=\frac{360}{5}}\\\displaystyle \large{s=72}\)

Therefore, the speed is 72 km / hour.

Notes

Sometimes, speed is defined as ‘v’ while velocity is defined as ‘v vector’ indicating that velocity is speed with direction and speed is just velocity with only magnitude.

__________________________________________________________

Two key problems for controlled fusion on Earth are high temperature and containment.

Nuclear fusion can be defined as a type of nuclear reaction that involves joining or combining two (2) smaller (light) nuclei of atoms, so as to form a single heavier nucleus accompanied with the release of energy.

In Science, controlled fusion can be defined as a thermonuclear process that typically involves the fusion of smaller (light) atomic nuclei into a single heavier nucleus, usually at high temperatures and under controlled conditions.

In this context, we can reasonably infer and logically deduce that high temperatures (heating) and containment are the two fundamental problems that are associated with controlled fusion on planet Earth.

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Complete Question:

Two key problems for controlled fusion on Earth are _______ and containment.

Answer:

Below

Explanation:

17.4 inches = 441.96 mm      14.8 inches = 375.92 mm

volume = 441.96 X 375.92 X T  

                                   = 166141.6 T  mm^3  <===where T = thickness in mm

Volume X density = mass

 166141.6 T mm^3  * 2.7 gm/cm^3  * cm^3 / 1000mm^3  = 10.8 gm

     solve for T = .024 mm

To calculate the efficiency of a machine, divide the work output by the work input and multiply the result by 100%.

Correct question:

The work output of a machine is 80 Joules, and its work input is 120 Joules. What is the efficiency of the machine?

Work output = 80 Joules

Work input = 120 Joules.

Efficiency = Working output/Work input *100

Efficiency = 80/120 *100

Efficiency = 0.67 *100

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Answer:

Kinectic friction is the answer to the lower part of the question

Answer:

Explanation: V°( INITIAL VELOCITY ) = 22 m/S

                       ANGLE (THETA) = 35°

                    V°Y( INITIAL VELOCITY AT Y AXIS ) =   ?

                     AS WE KNOW THAT  

                        V°Y    = V°sin ∅

                        V°Y    = 22 sin 35

                        V°Y    = 12.61 m/s

The cue ball's final velocity is 0.453 m/s, or 0.90 m/s.

The pace at which an item goes in one direction is known as its velocity. As the velocity of a car driving northward on a highway or the pace at which a rocket takes off. The vector quantity velocity (v), denoted by the formula v = s/t, quantifies deformation (or shift in position, s), over change in time (t).

The displacement that such an object or particles experiences with regards to time is expressed vectorially as velocity. The meters per second (m/s) is the accepted unit of velocity profile (sometimes known as speed).

Let "v" represent the ball's ultimate speed.

Apply the law of linear momentum conservation.

Total initial momentum is = Total final momentum

=(0.17 x 1.3) + (0.16 x 0) = (0.17 x v) + (0.16 x 0.90)

0.221 = 0.17v + 0.144

0.17 v = 0.221 - 0.144

v = (0.077) / (0.17)

v = 0.453 m/s

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Answer:

Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.

Explanation:

(self-explanatory)

I hope this helps, have a nice day.

When the capacitor is fully charged, the potential difference across the capacitor is equal to the voltage source.

Capacitor is a device which stores charges. Charges come from the current passing through it.

The charges stored in a capacitor is called capacitance.

Its unit is farad (F)

No current flows in the circuit when a capacitor is fully charged because the potential difference across the capacitor is equal to the voltage source.

Here, the charging current will be zero such that capacitor voltage equal to source voltage.

When the capacitor is fully charged, the potential difference across the capacitor is equal to the voltage source.

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The energy levels of a hydrogen atom are given by the equation E = -13.6 eV / n^2, where E is the energy, n is the principal quantum number, and -13.6 eV is the ionization energy of hydrogen.

For the 5th energy level (n = 5), we can calculate the radius of the electron's orbit using the Bohr radius formula:

r = (0.529 Å) * n^2 / Z,

where r is the radius, n is the principal quantum number, and Z is the atomic number (which is 1 for hydrogen).

Converting the Bohr radius from angstroms (Å) to nanometers (nm), we have:

r = (0.529 Å) * (5^2) / 1 = 2.645 Å.

To express the radius in nanometers, we convert the answer from angstroms to nanometers:

r = 2.645 Å * (0.1 nm/Å) = 0.2645 nm.

Therefore, the electron in the 5th energy level of a hydrogen atom orbits the nucleus at a radius of approximately 0.2645 nm.

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