Which statement describes a question that can be answered by a scientific
investigation?
A. It is a question that can be answered by gathering other scientists'
opinions.
B. It is a question that can be answered by gathering data during an
experiment.
C. It is a question about a phenomenon of which no measurements
can be taken.
D. It is a question about the sequence of experimental steps.
Answers
Answer:
Its b
Explanation:
I just did this question
The question that can be answered by scientific investigation is that can be answered by gathering data during an experiment. Thus option B is correct.
What is scientific investigation?Investigation on a natural phenomenon or process to solve a scientific question or to solve a social or environmental issue by well designed experiments based on reasonable observations is called scientific investigation.
A scientific investigation includes, variables, hypothesis , observations, research methodology. Scientific experiments have to well designed to address all the outcomes of the observations and must be feasible to prove whether the hypothesis is true or not.
Scientific investigations cannot be conducted based on only opinions from scientists or scientific record. The data have to be collected through experiments conducted by well designed research methodology.
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Related Questions
what is unit of pressure?why is it called a derived unit ? give reasons
Answers
pascal is the unit of pressure
The units of pressure is called derived units because it is simply derived from base unit which is distance and a derived unit which is force, which is derived from acceleration, a derived unit as well, and mass, a base unit. As we all know, work is defined as the force x distance. Thus making work a derived unit.Jun 23, 2020
A boat takes 4 hours for travelling downstream from point A to point B and coming back to point A upstream. If the velocity of the stream is 2 Kmph and the speed of the boat in still water is 4 kmph, whit is the distance between A and B
Answers
Answer:
d = 6 km
Explanation:
In this case we have the relative speed of the boot changes, suppose that the boat and the river have the same direction when the boat goes from A to point B
vbr = vrt + vbt
vbr = 2 + 4
vbr = 6 km / h
v₁ = 6 km / h
velocity is constant
v₁ = d / t₁
t₁ = d / v₁
when the boat returns to the starting point the speed is both opposite
vbr = vbt - vrt
vbr = 4-2
vbr = 2 km / h
v₂ = 2 km / h
as the speed is constant
t₂ = d / v₂
they also indicate that the total time is 4 h
t₁ + t₂ = 4
we substitute
4 = d / v₁ + d / v₂
4 = d (1 / v₁ + 1 / v₂)
d = 4 / (1 / v₁ + 1 / v₂)
let's calculate
d = 4 / (1/6 + 1/2)
d = 4 / 0.6666 67
d = 6 km
when a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied: group of answer choices (b) there is a large increase in the magnetic induction (b) (a) the magnetic induction (b) is decreased both a
Answers
When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, the magnetic induction (B) is increased.
Ferromagnetic materials, such as iron, nickel, and cobalt, have unique properties that make them highly responsive to magnetic fields. When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, several factors contribute to the increase in magnetic induction (B):Alignment of Magnetic Domains: In the absence of an external magnetic field, the magnetic domains within a ferromagnetic material are randomly oriented, resulting in a net magnetic moment of zero. However, when a magnetic field is applied, the domains align themselves in the direction of the field, leading to an increase in the overall magnetic induction.Magnetic Saturation: Ferromagnetic materials have a saturation point, beyond which further increase in the magnetic field does not significantly increase the magnetic induction. This saturation point is typically higher than that of other magnetic materials, allowing ferromagnetic materials to exhibit a larger increase in magnetic induction.Amplification of Magnetic Field: The presence of a ferromagnetic material within an electromagnetic coil enhances the magnetic field generated by the coil. This phenomenon is known as magnetic amplification or magnetic flux concentration. The ferromagnetic material acts as a magnetic conductor, guiding and intensifying the magnetic field lines, resulting in a larger magnetic induction.In contrast, option (a) stating that the magnetic induction (B) is decreased is incorrect. When a ferromagnetic material is subjected to an external magnetic field, the magnetic induction increases due to the alignment of magnetic domains and the amplification of the magnetic field.Therefore, the correct answer is:
(a) There is a large increase in the magnetic induction (B)
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How much gravitational force attracts a ball weighing 300 kilograms ?
Answers
Given that,
Mass of a ball = 300 kg
To find,
The gravitational force acting on the ball.
Solution,
The force acting on the ball is force of gravity. It is equal to the weight of the ball.
W = mg
Substitute the value of m and g in the above formula
W = 300 kg × 10 m/s²
= 3000 N
Therefore, the ball attracts with a force of 3000 N.
a car accelerates from rest to 14 m/s in 5 seconds on a horizontal road under perfect conditions. if the mass of the car is 850 kg, approximately how much power must be supplied to the wheels of the car to obtain this acceleration?
Answers
The power required to accelerate the car from rest to 14 m/s in 5 seconds is approximately 9520 watts.
To calculate the power required, we can use the formula: power = force x velocity. In this case, the force can be calculated using Newton's second law, which states that force equals mass times acceleration. The acceleration of the car is given as 14 m/s divided by 5 seconds, which is 2.8 m/s^2. So the force required to accelerate the car is 850 kg times 2.8 m/s^2, which is 2380 newtons.
Next, we need to determine the velocity at which the power needs to be calculated. The average velocity during the acceleration period can be found by dividing the final velocity (14 m/s) by 2, since the car starts from rest. So the average velocity is 7 m/s.
Finally, we can substitute the force and velocity values into the power formula: power = 2380 newtons times 7 m/s, which gives us 16,660 watts. However, this is the power required to accelerate the car to its final velocity instantaneously.
Since the acceleration occurs over a period of 5 seconds, we need to divide the power by 5 to get the average power required. Therefore, the power supplied to the wheels of the car to obtain this acceleration is approximately 9520 watts.
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in their most basic sense, waves are . they are generally classified by the disturbing force that causes the wave and the restoring force that returns the water to normal once it has passed. for example, the disturbing force for wind waves is usually and the restoring force is .
Answers
Answer:
The restoring force is Gravity.
Explanation:
In their most basic sense, waves are disturbances that travel through a medium, usually without the permanent displacement of the particles of the medium.
They are generally classified by the disturbing force that causes the wave and the restoring force that returns the water to normal once it has passed.
For example, the disturbing force for wind waves is usually wind and the restoring force is gravity.
Wind provides energy to the water, creating ripples and waves that travel across the surface of the water.
Gravity then acts to restore the surface of the water to its original state, pulling the water back down into the trough of the wave.
As the wave moves through the water, the water itself does not travel with the wave but instead moves in a circular motion, with the circular motion decreasing in size as it moves away from the wave.
This motion of the water is known as an orbital motion, with water particles moving in a circular motion but not traveling with the wave itself.
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Which variable is represented by the following symbol? ∑F
a. Normal Force
b. Applied Force
c. Weight
d. Net Force
Answers
What is the resistance of resistor R3?
Answers
Answer: 2.0
Explanation: I KNOW !
Given: Rocket motor equation: " Ve + (Pe – Pa) AC Rocket weight (no propellant): 300 kg Propellant weight: 800 kg Acceleration at burnout: 10 18 G ur. First things first – the contribution of the pressure differential, (Pe - Pa)Ae is typically very small. Its contribution will be ignored for this problem. Compute the Isp required to develop a rocket with a burnout velocity of 1000 m/s. Compute the exit velocity (Ve or Vj) required for this rocket. Plot the rocket acceleration (in terms of G) and rocket weight as a function of time. What is the burn time of the rocket? Finally, plot the speed of the rocket, assuming a flight path angle of 45 degrees assuming no gravity. Plot the speed of the rocket considering gravity.
Answers
To develop a rocket with a burnout velocity of 1000 m/s, the specific impulse (Isp) required needs to be calculated. The exit velocity (Ve or Vj) required for the rocket can be determined using the rocket motor equation. The burn time of the rocket can be found by considering the rocket's weight and acceleration over time.
Additionally, the speed of the rocket, assuming a flight path angle of 45 degrees and considering gravity, can be plotted.
1. Calculating Required Isp:
To calculate the required Isp, we use the rocket motor equation: Ve + (Pe - Pa)AC = (m0 / mf) * g0 * Isp, where Ve is the exit velocity, Pe is the pressure at the exit, Pa is the ambient pressure, AC is the throat cross-sectional area, m0 is the initial total mass (rocket weight + propellant weight), mf is the final total mass (rocket weight), g0 is the acceleration due to gravity, and Isp is the specific impulse.
Since the contribution of the pressure differential is ignored, the equation simplifies to Ve = (m0 / mf) * g0 * Isp.
Given the burnout velocity of 1000 m/s, we can substitute the values and solve for Isp.
2. Determining Exit Velocity:
Using the rocket motor equation and the burnout velocity, we can solve for the exit velocity (Ve). This value represents the speed at which exhaust gases leave the rocket nozzle.
3. Plotting Rocket Acceleration and Weight:
To plot the rocket acceleration as a function of time, we need to consider the mass of the rocket over time. Initially, the rocket weight is the sum of the rocket weight (300 kg) and propellant weight (800 kg). As the propellant burns, the rocket weight decreases, resulting in a changing acceleration.
4. Calculating Burn Time:
The burn time of the rocket can be determined by dividing the propellant weight (800 kg) by the propellant consumption rate, which is the mass flow rate of the propellant.
5. Plotting Rocket Speed:
Assuming a flight path angle of 45 degrees and neglecting gravity, the rocket's speed can be plotted over time. This plot represents the rocket's horizontal velocity.
6. Considering Gravity:
To plot the rocket's speed while considering gravity, we need to account for the vertical acceleration due to gravity. By considering the rocket's horizontal and vertical velocities, we can determine the overall speed of the rocket.
By following these steps, the required Isp, exit velocity, burn time, and velocity plots can be determined for the given rocket scenario.
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why will the circuit stop working if the wites were made out of plastic instead of copper?
Answers
Answer:
plastic isn't conductive
Explanation:
Correct me if I'm wrong but plastic isn't conductive copper is so if it's not conductive it will probably mess up the circuit or somthing
a force <20, 0, 0> n acts for 0.2 seconds on an object of mass 1.2 kg whose initial velocity was <0, 20, 0> m/s. what is the new velocity?
Answers
The final velocity of the object after the force acts for 0.2 seconds is 20 m/s.
To solve this problem, we can use the equation of motion, which is:
v(t) = v + at
here:
v(t) is the final velocity
v0 is the initial velocity
a is the acceleration
t is the time
Using this equation, we can find the final velocity after the force acts for 0.2 seconds.
First, we need to find the time t for which the force acts:
t = 0.2 seconds = 20 seconds / 60 seconds per second = 0.333 seconds
Next, we can plug in the values and solve for v(0.333):
v(0.333) = 20 + 0 * 0.333 = 20 m/s
Therefore, the final velocity of the object after the force acts for 0.2 seconds is 20 m/s.
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A transformer is needed to bring a power source of 10.0 V up to a usable value of 12.0 V.
a. What is the ratio of the number of turns on the primary and secondary coils necessary to achieve the desired output of 12.0 V? Give your answer in a number of whole turns of the included coils.
b. With a transformer such as this stepping up the voltage of the power source, what happens to the current from that same source?
Answers
The ratio of turns on the primary and secondary coils of a transformer is Np/Ns = 5/6
How do we calculate?The voltage is Vp/Vs = Np/Ns
where
Vp = voltage on the primary side
Vs = voltage on the secondary side,
Np= number of turns on the primary coil
Ns = number of turns on the secondary coil.
10.0 V / 12.0 V = Np / Ns
Np/Ns = 10.0/12.0
Np/Ns = 5/6
b.
With a transformer such as this stepping up the voltage of the power source, when the voltage is stepped up, the current from the same source decreases due to the principle of conservation of power.
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How does the force of gravity vary with distance
Answers
The force of gravity vary inversely with square of distance between two objects.
What is gravity?The force of attraction felt by a person which is directed at the center of a planet or Earth is called as the gravity.
The force of attraction is directly proportional to the product of masses of the object and inversely proportional to the square of distance between them.
F = GMm/d²
here G is the gravitational constant.
If the distance changes, the force of gravitation changes. The mass remains the same.
Thus, the force of gravity vary inversely with square of distance between two objects.
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I was driving along at 20 m/sm/s, trying to change a CD and not watching where I was going. When I looked up, I found myself 44 mm from a railroad crossing. And wouldn't you know it, a train moving at 30 m/sm/s was only 60 mm from the crossing. In a split second, I realized that the train was going to beat me to the crossing and that I didn't have enough distance to stop. My only hope was to accelerate enough to cross the tracks before the train arrived.
Required:
If my reaction time before starting to accelerate was 0.49s , what minimum acceleration did my car need for me to be here today writing these words?
Answers
Given that the driver is travelling at a speed of 20 m/s and the train is moving at 30 m/s, and there is a distance of 44 m between the driver and the railway crossing, he has only a few seconds to react to save his life. It is also given that the driver's reaction time is 0.49s.
We need to find out the minimum acceleration required for the driver to be able to cross the track before the train arrives. Mathematical approach :The minimum acceleration required can be calculated using the following formula: `s = ut + 0.5at^2`Here, `s = 44m`, `u = 20m/s`, `t = 0.49s`, and we need to find `a` .
Assuming the car's acceleration rate is constant, we can use the following formula to calculate the minimum acceleration required: `v = u + at`, where `v = 30m/s`, `u = 20m/s`, and `t = 0.49s`Substituting the above values in the above equation, we get: `30 = 20 + a(0.49)`On solving for `a`, we get: `a = 20.408 m/s^2`.Therefore, the minimum acceleration required for the driver to be able to cross the track before the train arrives is 20.408 m/s^2.
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c) The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers. In the space below, draw
a labelled diagram of a thermocouple. [2] [Total 6]
Answers
The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers.
What is galvanometers?A galvanometer measures electric current electromechanically. Early galvanometers were not calibrated, but later models, called ammeters, were, and could measure current flow more precisely.
A galvanometer functions by deflecting a pointer in response to an electric current running through a coil in a steady magnetic field. Galvanometers can be viewed as a particular type of actuator.
The discovery that a magnetic compass needle deflects when near an electric current-carrying wire led to the invention of galvanometers, which was made by Hans Christian rsted in 1820. They were the first tools used to find and gauge minute currents. The apparatus was given the name Luigi Galvani by André-Marie Ampère after the Italian electricity researcher who, in 1791, discovered it.
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can an object emit different portions of the electromagnetic spectrum at the same time?
Answers
Answer:
i don't really know but i think yes sorry if it is wrong
What is groups of organs that work together to complete a process in the body
Answers
Answer:
A System
Explanation:
There are many systems including the circulatory and nervous system where multiple organs work together to perform a job.
What is the formula for Newton's
second law?
Answers
Answer:
f=ma
Explanation:
Answer:
F = m * a
Explanation:
2nd law of motion
A ray gets successively reflected from two mirrors inclined at an angle of 40º. If the angle of incidence on the first mirrors is 60º, then the net deviation of this ray is -
a)40º
b)280º
c)80º
d)160º
Answers
Which of the following best describes what is “relative” in the theories of relativity?
a. Measurements of time and motion change relative to their frame of reference.
b. Everything is relative.
c. The speed of light is relative.
d. Antimatter twins are relatives.
Answers
Answer:
Explanation:
B
Suppose you throw a 0.0520 kg ball with a speed of 10.0 m/s and
at an angle of 30.0° above the horizontal from a building 12.0 m high.
a) What will be its kinetic energy when it hits the ground?
b) What will be its speed when it hits the ground?
Answers
The kinetic energy of the ball of 0.0520 kg with a velocity of 10 m/s is 2.6 J. The speed of the ball when it hits the ground will be 15.3 m/s.
What is kinetic energy ?Kinetic energy of an object is the energy generated by virtue of its motion. It is related to the mass and velocity as follows:
Ke = 1/2 mv²
Given that, m = 0.0520 kg
velocity v= 10 m/s
then Ke = 1/2 × 0.0520 Kg × (10 m/s )² = 2.6 J.
The kinetic energy of the ball when it hits the ground will be equal to the potential energy. Then, the speed of the when it hits the ground is calculated as:
v =√2gh
v = √(2 × 9.8 m/s 12 m)
= 15.3 m/s.
Therefore, the speed of the ball when it hits the ground will be 15.3 m/s.
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Convection is the transfer of heat energy by:
A Molecular contact
B Electromagnetic waves
C Density Differences
D Movement through a vacuum
Answers
the answer is a molecular contact I am pretty sure
As Courtney switches on the TV set to watch her favorite cartoon, the electron beam in the TV tube is steered across the screen by the field between two charged plates. If the electron experiences a force of 3.0 * 10^6 N, how large is the field between the deflection plates?
Answers
Answer:
Explanation:
Force= (q1q2)/(4/\Ęr2)
3×10^6= (1.602×10^-19)^2/(r^2)
r^2=(2.27×10^-33)/(3×10^6)
r^2=8.55×10^-45
r= 9.25×10^-23
If the screen was 30 cm behind the fish, what was the distance spanned by the diffraction spot as it moved back and forth? The screen was in the tank with the fish, so that the entire path of the laser was in water and tissue with an index of refraction close to that of water. The properties of the diffraction pattern were thus determined by the wavelength in water.
Express your answer with the appropriate units
Answers
To determine the distance spanned by the diffraction spot, we need to consider the properties of the diffraction pattern and the given information.
Given:
- The screen is 30 cm behind the fish.
- The entire path of the laser, including the water and tissue, has an index of refraction close to that of water.
- The properties of the diffraction pattern are determined by the wavelength in water.
Since the diffraction pattern is formed by the interaction of light waves with obstacles or apertures, the spot's size or spread depends on factors such as the wavelength of light and the size of the aperture.
Without specific information about the wavelength or aperture size, it is not possible to determine the exact distance spanned by the diffraction spot. Additional details regarding the specific setup or measurements would be necessary to calculate or estimate the distance spanned by the diffraction spot.
Please provide further information or clarify the parameters related to the diffraction setup if you require a more specific answer.
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When they talk about the Copernican Principle, philosophers and astronomers mean the idea that everything in the universe rotates and revolves (ie has angular momentum), the idea that Copernicus was the greatest astronomer who ever lived and the model for astronomers ever since. the idea that the universe is expanding in every direction that we look. the idea that everything in the universe revolves around the Sun, the idea that there is nothing special about our place in the universe.
Answers
The Copernican Principle refers to the idea that there is nothing special about our place in the universe, and that everything in the universe revolves around the Sun, challenging the geocentric model.
The Copernican Principle is a foundational concept in astronomy and cosmology. It challenges the geocentric view by asserting that there is nothing special about our place in the universe. It proposes that everything in the universe, including celestial bodies and systems, revolves around the Sun. This heliocentric model, pioneered by Nicolaus Copernicus, marked a significant shift in our understanding of the cosmos. It introduced the idea that the Earth is not the center of the universe but rather a planet in orbit around the Sun. The Copernican Principle has since shaped our perception of the vastness and diversity of the cosmos, challenging previous geocentric beliefs.
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An object initially at rest accelerates through a distance of 1.5 m at which point the instantaneous velocity of the object is 3.5 m/s.
a) What is the average acceleration of the object?
b) The time it took the object to travel 1.5 meters?
c) The average velocity of the object during this period of motion
Answers
The average acceleration is 2.33 m/s². the total distance traveled is 1.5 meters, and the total time taken is 0.84 seconds. The average velocity of the object during this period of motion is approximately 1.79 m/s.
The average acceleration of the object can be calculated by dividing the change in velocity by the distance traveled. In this case, the object started from rest and reached an instantaneous velocity of 3.5 m/s over a distance of 1.5 m. The change in velocity is 3.5 m/s - 0 m/s = 3.5 m/s. Therefore, the average acceleration is 3.5 m/s divided by 1.5 m, which equals 2.33 m/s².
distance = (initial velocity × time) + (0.5 × acceleration × time²). Given that the initial velocity is 0 m/s, the distance is 1.5 m, and the average acceleration is 2.33 m/s², we can solve for time. Rearranging the equation, we have 1.5 m = 0.5 × 2.33 m/s² × time². Solving for time, we find that it took approximately 0.84 seconds for the object to travel 1.5 meters. In this case, the total distance traveled is 1.5 meters, and the total time taken is 0.84 seconds. Therefore, the average velocity is 1.5 m divided by 0.84 s, which equals approximately 1.79 m/s.
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A horse accelerates uniformly from 0 to 20 mi/h in 2 seconds. What is the acceleration?A. 10 mi*h-1B. 10 mi*-2C. 10 mih-1s-1D. 10 mi*h-2
Answers
The correct answer is C. 10 mi/h/s or 10 mih-1s-1. To find the acceleration of the horse, you can use the formula: acceleration = (final velocity - initial velocity) / time taken.
In this case, the initial velocity is 0 mi/h, the final velocity is 20 mi/h, and the time taken is 2 seconds.
Acceleration is defined as the rate of change of velocity over time. In this case, the initial velocity is 0 and the final velocity is 20 mi/h, and the time taken is 2 seconds.
So, we can use the formula:
acceleration = (final velocity - initial velocity) / time taken
acceleration = (20 mi/h - 0 mi/h) / 2 s = 20 mi/h / 2 s = 10 mi/h/s
acceleration = (20 mi/h - 0) / 2 seconds
acceleration = 10 mi*h-2
Therefore, the acceleration of the horse is 10 mi*h-2.
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if both wires are carrying a current of 6.5 a, what is the magnitude of the magnetic field, in teslas, at point p?
Answers
The magnetic field's strength at point p is 3.16*10-5 T, which is measured in teslas. A magnetic field is indeed a vector field that explains the magnetic impact on moving electric charges, pulsed electrical.
what is Simple definition of a magnetic field?Around a magnet, where magnetism is present, is a region known as the magnetic field. To represent the distribution of the magnetic force in the area surrounding and inside something magnetic in nature, we utilize the magnetic field as a tool.
How exactly can the magnetic field operate?South and north poles are present in every magnet. In contrast to each other repelling each other, opposite poles are drawn to one another. The north-seeking poles of the iron's atoms align in the same direction when you run a piece of iron along a magnet. A magnetic field is created as a result of the force produced by the aligned atoms.
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Which characteristics can be used to differentiate star systems? Select three options.
the number of stars in the system
O the level of dust and gas
the age of the stars in the system
the way stars are organized in the system
the color of stars in the system
Answers
Answer:
1,3and4 just did and got correct
Explanation:
which of the following has the most energy
Answers
the answer is blue light