Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations. In what way do laboratory experiments primarily differ from other forms of scientific investigations?
A.
A laboratory experiment is the only accepted form of investigation within the scientific community.
B.
Studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.
C.
Data can only be generated through laboratory experiments, not other forms of investigation.
D.
Laboratory experiments involve the identification and control of variables.

Answer:

D. Gas

Explanation:

There are only three states of matter: solid, liquid and gas. This makes choice c (Mixture) incorrect because it is not part of the group.

The particles in gas are widely separated, which means there's a lot of free space between the particles. This makes it easily compressible. The particles then move past each other, which causes no regular arrangement.

Answer:

Magnetic induction cannot be done in a wood because it is not a magnetic person like iron , nickel,and cobalt

Answer: 10.98 N

Explanation:

Given

mass of box is \(m=0.5\ slugs\approx 7.3\ kg\)

The coefficient of kinetic friction is \(\mu= 0.4\)

It is given that on the application of force box started moving with constant speed i.e. there is no net external force

\(\Rightarrow F+mg\sin 30^{\circ}=\mu mg\cos 30^{\circ}\\\Rightarrow F=mg(\mu \cos 30^{\circ}-\sin 30^{\circ})\\\Rightarrow F=7.3\times 9.8(0.866\times0 .4-0.5)=-10.98\ N\\\)

The negative sign indicates direction of force is opposite i.e. it must be applied upwards

Answer:

C

Explanation:

trust?

Answer:

C. It has enough forward velocity to fall around the earth

Explanation:

This should be the correct answer.

The magnitude of the deceleration of the car will be 3.895 meters per second square.

One dimension denotes mobility in a single direction or in a straight line. Think of a vehicle traveling down a straight road or a person walking on a straight track. Imagine throwing something vertically into the air, then observing it fall.

When the driver suddenly presses the brakes, a car that is now moving at 28.6 m/s begins to slow down steadily. Within 105 meters, the vehicle stops.

v² - u² = 2as

0² - (28.6)² = 2 x a x 105

- 817.96 = 210a

a = - 3.895 meters per second square

The magnitude of the deceleration will be 3.895 meters per second square.

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Even before the advent of the telescope, ancient astronomers were able to observe the following:

1. Celestial Bodies: Ancient astronomers could observe celestial bodies such as the Sun, Moon, stars, and planets. They could track their movements across the sky and study their patterns and behaviors.

2. Solar and Lunar Eclipses: By carefully observing the positions of the Sun, Moon, and Earth, ancient astronomers could predict and witness solar and lunar eclipses. They noticed that during a solar eclipse, the Moon blocks the Sun's light, creating a temporary darkness on Earth, while during a lunar eclipse, the Earth casts a shadow on the Moon, causing it to appear reddish or darkened.

3. Stellar Positions: Ancient astronomers mapped and observed the positions of stars in the night sky. They recognized patterns and constellations, which helped them navigate and keep track of time.

4. Seasons and Celestial Movements: By observing the changing positions of the Sun and its daily and yearly motions, ancient astronomers could understand the changing seasons. They could determine solstices, equinoxes, and the length of days and nights.

5. Comet Appearances: Ancient astronomers were able to observe and document the appearance of comets in the night sky. They recognized these celestial objects as distinct from stars and noted their unusual and transient nature.

These observations formed the basis of ancient astronomy and laid the groundwork for the development of more advanced astronomical techniques and instruments, including the telescope.

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It would take approximately 546 days for the decay rate of the sample of this radioactive isotope to fall to 0.58 of its initial rate.

1. The decay rate of a radioactive isotope is proportional to the number of radioactive atoms present in the sample at any given time.

2. The decay rate can be expressed as a function of time using the formula: R(t) = R₀ * \(e^{(-\lambda t\)), where R(t) is the decay rate at time t, R₀ is the initial decay rate, λ is the decay constant, and e is the base of the natural logarithm.

3. The half-life of a radioactive isotope is the time it takes for half of the radioactive atoms in a sample to decay. In this case, the half-life is given as 210 days.

4. Using the half-life, we can find the decay constant (λ) using the formula: λ = ln(2) / T₁/₂, where ln(2) is the natural logarithm of 2 and T₁/₂ is the half-life.

5. Substituting the given half-life into the formula, we have: λ = ln(2) / 210.

6. Now, we need to find the time it takes for the decay rate to fall to 0.58 of its initial rate. Let's call this time "t".

7. Using the formula for the decay rate, we can write: 0.58 * R₀ = R₀ * e^(-λt).

8. Simplifying the equation, we get: 0.58 = \(e^{(-\lambda t\)).

9. Taking the natural logarithm of both sides, we have: ln(0.58) = -λt.

10. Substituting the value of λ from step 5, we get: ln(0.58) = -(ln(2) / 210) * t.

11. Solving for t, we have: t = (ln(0.58) * 210) / ln(2).

12. Evaluating the expression, we find: t ≈ 546.

13. Therefore, it would take approximately 546 days for the decay rate of the sample of this radioactive isotope to fall to 0.58 of its initial rate.

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Answer:

I think its B

Explanation:

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 60 × 10 × 4

We have the final answer as

Hope this helps you

Answer: Taxpayers

Explanation:

Taking alcohol before driving or while driving is dangerous and has resulted in lots of accidents and deaths. Alcohol tampers with the normal functioning of the brain, and also impairs ones reasoning.

Alcohol impaired driving cases handled by government officials are paid for by the taxpayers. A tax is the levy that the people in the country pays. Those funds are used in handling different government objectives and this is one of such ways.

Answer:

Energy is flowing from the air and the table to the ice cream, which causes the ice cream to melt

For the dish of ice cream, energy is flowing from the air and the table to the ice cream, which causes the ice cream to melt.

The energy transfer is the process of conversation of the one of energy into the another form. This energy can be transfer from heat energy to mechanical energy or from light energy to electric energy.

Here, the dish of ice cream was left out on a table and is beginning to melt.

As the dish of ice cream is melt, then there is the endothermic process (the process in which the energy is released in the form of light or heat) take place.

As the endothermic process is the process in which the energy is released in the form of light or heat.

Thus, in order to melt the dish of ice cream, it need to absorb the energy by the ice cream to melt. This energy is transferred from the surrounding to the ice cream.

Thus, for the dish of ice cream, energy is flowing from the air and the table to the ice cream, which causes the ice cream to melt. Option D is the correct option.

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Suspending the balloons near each other and observing which way they deflect

Suspending each balloon near the material it was not rubbed on and seeing which way it deflects

An object can be charged by friction. When two objects are rubbed against each other, electrons can be transferred from one object to the other, resulting in one object becoming positively charged and the other becoming negatively charged. This is known as the triboelectric effect.

We know that if the objects do have the same charge then they will deflect away from each other but towards each other if they have opposite charges.

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The speed of how fast the birdman should be to hit the bucket is 18.8 m/s

The only force acting on the height at which birdman flies is the gravitational force field.

Suppose the initial velocity (u) is parallel to the ground when the time (t) hits the ground.

Then, we can use the second equation of motion to determine the time (t) when the bird hits the ground.

\(\mathbf{S = ut + \dfrac{1}{2}gt^2}\)

\(\mathbf{78 \ m =(0)t + \dfrac{1}{2}(9.8)t^2}\)

\(\mathbf{78 \ m =4.9 t^2}\)

\(\mathbf{t^2 = \dfrac{78 \ m}{4.9 m/s^2} }\)

\(\mathbf{t^2 = 15.918 \ s^2}\)

\(\mathbf{t =\sqrt{ 15.918 \ s}}\)

\(\mathbf{t =3.989\ s}}\)

Now, the speed of how fast the birdman should be to hit the bucket can be determined using;

\(\mathbf{Speed = \dfrac{Distance}{Time}}\)

\(\mathbf{Speed = \dfrac{75 \ m }{3.989\ s}}\)

\(\mathbf{Speed = 18.8 m/s}\)

Therefore, we can conclude that the speed of how fast the birdman should be to hit the bucket is 18.8 m/s

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Cheese is made of casein protein, which is originally made from milk and is high in protein. The texture of the cheese is determined by the quality of the milk, so cow's milk cheese differs from goat's milk cheese.

Diary products are made from milk, such as cheese, curd, yogurt, etc., but all of them have different nutrients. The quality of these dairy products depend upon the quality of the milk, as some milking animals have a higher concentration of fats in their milk than other animals. These dairy products are used in different industrial sectors, such as for making ice cream, chocolate, and different food products.

Hence, cheese is made up of casein proteins that are present in the milk.

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An electromagnet consists of a conductive wire wrapped around a magnetic core, creating a magnetic field when an electrical current is passed through it.

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Answer:Because you just really need help on your work!

Explanation:

Answer:

Gravity is on our side. On top of that, the optimal body position allows us to do it.

It is useful to use a model in order to demonstrate how an electric circuit works.

In science, a model is a graphical representation that my result useful to predict the behavior of the components of a given system that works together to produce a particular outcome.

For example, an electrical circuit can be modeled by taking into account resistance, voltage, and intensity as parameters of functioning.

The electrical circuits are graphically represented by modeling the movement or flow of negatively charged electrons (e-) from the negative pole to the positive pole of a closed electric circuit.

In conclusion, it is useful to use a model (ie., a scientific model) to demonstrate how an electric circuit works.

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How much heat will change 10 g of ice at 0 C to

water at 0 C?

Answer:

Weight of 21 kg is misleading as kg is a unit of mass.

F = m g = 21 kg * 9.8 m/s^2 = 206 Newton's

P(pressure) = Force / Area        definition of pressure

1 cm^2 = 1.0E-4 m^2

200 cm^2 = .02 m^2

P = 206 N / .02 m^2 = 10,300 N/m^2 = 10,300 Pascals

Answer:

20 seconds

360 meters

Explanation:

On a distance-time graph:

Therefore:

Convert Bus A's given speed of 54 km/h into m/s by dividing by 3.6:

\(\implies \sf 54\; km/h=\dfrac{54}{3.6}=15\:m/s\)

Therefore:

So the y-intercept is (0, 60) and the gradient is 15.

Substitute this information into the slope-intercept form of a linear equation to create an equation representing the motion of Bus A:

\(\boxed{y=15x+60}\)

Convert Bus B's given speed of 36 km/h into m/s by dividing by 3.6:

\(\implies \sf 36\; km/h=\dfrac{36}{3.6}=10\:m/s\)

Therefore:

So the y-intercept is (0, 160) and the gradient is 10.

Substitute this information into the slope-intercept form of a linear equation to create an equation representing the motion of Bus B:

\(\boxed{y=10x+160}\)

To find the time when Bus A is at the same position as Bus B, substitute Bus A's equation into Bus B's equation and solve for x:

\(\implies 15x+60=10x+160\)

\(\implies 15x+60-10x=10x+160-10x\)

\(\implies 5x+60=160\)

\(\implies 5x+60-60=160-60\)

\(\implies 5x=100\)

\(\implies \dfrac{5x}{5}=\dfrac{100}{5}\)

\(\implies x=20\)

Therefore, the two buses are at the same position 20 seconds after they start moving.

To find their position at this point, substitute x = 20 into one of the equations and solve for y:

\(\implies y=10(20)+160\)

\(\implies y=200+160\)

\(\implies y=360\)

Therefore, the two buses are at the same position at 360 m from the origin.

Bus A overtakes Bus B 20 seconds after they start moving and at 360 m from the origin.

There is more to the Earth than what we can see on the surface. In fact, if you were able to hold the Earth in your hand and slice it in half, you'd see that it has multiple layers. But of course, the interior of our world continues to hold some mysteries for us. Even as we intrepidly explore other worlds and deploy satellites into orbit, the inner recesses of our planet remains off limit from us.

However, advances in seismology have allowed us to learn a great deal about the Earth and the many layers that make it up. Each layer has its own properties, composition, and characteristics that affects many of the key processes of our planet. They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core. Let's take a look at them and see what they have going on.

Like all terrestrial planets, the Earth's interior is differentiated. This means that its internal structure consists of layers, arranged like the skin of an onion. Peel back one, and you find another, distinguished from the last by its chemical and geological properties, as well as vast differences in temperature and pressure.

Explanation:

The car is moving at approximately 12.5 meters per second.

The kinetic energy (KE) of an object can be calculated using the formula:

KE = 1/2 * m * \(v^2\)

where

KE = kinetic energy,

m =Mass of the object, and

v = velocity.

In this case, we are given the mass (m) of the car as 1600 kg and the kinetic energy (KE) as 125,000 J. To find the velocity .

Substituting the  values , we have:

125,000 J = 1/2 * 1600 kg *\(v^2\)

Now, we can solve for v by rearranging the equation:

\(v^2\) = (2 * 125,000 J) / 1600 kg

\(v^2\) = 156.25 \(m^2/s^2\)

Taking the square root, we find:

v = √156.25\(m^2/s^2\)

v ≈ 12.5 m/s

Therefore, the car is moving at approximately 12.5 meters per second.

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D. The input rating of the furnace is determined as 100,000 BTU.

Input power rating means the power, expressed in Watts or one of its multiples, for which the energy storage unit has been designed to operate at nominal conditions.

eff = (output rating / input rating) x 100%

80/100 = 80,000 BTU / input rating

0.8 = 80,000 BTU / input rating

input rating = 80,000 BTU/0.8

input rating = 100,000 BTU

Thus, the input rating of the furnace is determined as 100,000 BTU.

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If the frequency is doubled, the maximum induced emf is multiplied by a  factor of 2.

a) the maximum induced emf is 137.39 V.

b) the maximum induced current is 11.63 A

c)  the induced emf and current as functions of time is given by E = Eₘ sin ωtI = (Eₘ / R) sin ωt

d) the maximum torque required to keep the coil turning is 5.17 Nm.

The frequency of the AC generator is 62.1 Hz

The number of turns of wire, n = 8

Area of each turn of wire, A = 0.0940 m²

Total resistance of wire, R = 11.8 Ω

Magnetic field, B = 0.549 T

The formula to find the maximum induced EMF is given by E = nABω

Where,E is the maximum induced EMF, n is the number of turns of wire, A is the area of each turn of wire, ω is the angular frequency of the coil in rad/s, B is the magnetic field

Substituting the values in the above formula, we get

E = 8 × 0.0940 × 0.549 × 2π × 62.1E = 137.39 V

Therefore, the maximum induced EMF is 137.39 V.

b) The formula to find the maximum induced current is given by

I = E/R

Where,I is the maximum induced current, E is the maximum induced EMF, R is the resistance of the wire

Substituting the values, we get

I = 137.39 / 11.8I

I = 11.63 A

(c) Induced EMF and current as functions of time

E = Eₘ sin ωtI = (Eₘ / R) sin ωt

where Eₘ = maximum induced EMF

(d) Maximum torque required to keep the coil turning

τ = B² A n² ω²/ Rτ

τ = 0.549² × 8² × 0.0940 × (2π × 62.1)² / 11.8τ

τ = 5.17 Nm

Therefore, the maximum torque required to keep the coil turning is 5.17 Nm.

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The vector product of A=2.00i+3.00j+1.00k and B=1.00i-3.00j-2.00k is C=9.00i+4.00j-9.00k.

To find the vector product (also known as the cross product) of two vectors, A and B, we can use the following formula:

C = A × B

Where C is the resultant vector, A and B are the given vectors, and × denotes the cross product.

Given A = 2.00i + 3.00j + 1.00k and B = 1.00i - 3.00j - 2.00k, we can substitute these values into the formula to find the vector product:

C = (2.00i + 3.00j + 1.00k) × (1.00i - 3.00j - 2.00k)

Now, let's expand the cross product using the properties of vector products:

C = (2.00i × 1.00i) + (2.00i × -3.00j) + (2.00i × -2.00k) +

   (3.00j × 1.00i) + (3.00j × -3.00j) + (3.00j × -2.00k) +

   (1.00k × 1.00i) + (1.00k × -3.00j) + (1.00k × -2.00k)

Now, let's calculate each of these cross products:

C = (2.00 × 1.00) \(i^2\) + (2.00 × -3.00) i × j + (2.00 × -2.00) i × k +

   (3.00 × 1.00) j × i + (3.00 × -3.00) \(j^2\) + (3.00 × -2.00) j × k +

   (1.00 × 1.00) k × i + (1.00 × -3.00) k × j + (1.00 × -2.00) \(k^2\)

Since i × j = k, j × k = i, and k × i = j, we can simplify the expression further:

C = 2.00k - 6.00i + 4.00i - 9.00j + k - 3.00j - 2.00j - 2.00k

Combining like terms, we get:

C = (2.00i + 4.00i) + (-6.00i - 9.00j - 3.00j) + (2.00k + k - 2.00k)

Simplifying further:

C = 6.00i - 12.00j + k

Therefore, the vector product of A and B is C = 6.00i - 12.00j + k, which can be written as C = 9.00i + 4.00j - 9.00k in terms of i, j, and k.

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The vector product of A and B is -3i - 5j - 9k.

The vector product, also known as the cross product, of two vectors A and B is denoted as A x B. It is a vector that is perpendicular to both A and B. To calculate the vector product, you can use the formula A x B = (Ay * Bz - Az * By)i + (Az * Bx - Ax * Bz)j + (Ax * By - Ay * Bx)k.

In this case, we have A = 2.00i + 3.00j + 1.00k and B = 1.00i - 3.00j - 2.00k. Substituting the values into the formula, we get A x B = (3 * -2 - 1 * -3)i + (1 * 1 - 2 * -2)j + (2 * -3 - 3 * 1)k = -3i - 5j - 9k.

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Answer:

108 N

Explanation:

Use Newton's second law.

F = ma

F = (90 kg) (1.2 m/s²)

F = 108 N

The rank of the forces in order of increasing magnitude is Fg < FB < FA.

option D is the correct answer.

The net force on an elevator moving upwards is determined by the force of gravity acting downwards and the normal force of the elevator acting upwards.

That is, the two forces acting on a person when he is moving in an elevator are:

When the two forces are of equal magnitude, the elevator will be static or moving with constant velocity.

When the magnitude of the two force are unequal, then the elevator will be accelerating upward or downward.

Since the elevator is moving upwards, it implies that the normal force is greater than the force of gravity acting downwards.

The box at the bottom will feel much heavier due to the weight of box and gravity acting downwards.

FA = FB + Fg

Thus, the force exerted on box A is the greatest, followed by the force on box B and then, the smallest is force of gravity.

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Answer:

a)  \(v_2=35.60ft/sec\)

b) \(h_2=45ft\)

Explanation:

From the question we are told that:

Weight \(W=100lbf\)

Decrease in kinetic energy \(dK.E= 500 ft lbf\)

Increase in potential energy \(dP.E =1500 ft lbf.\)

Velocity \(V_1=40\)

Elevation \(h=30ft\)

\(g=32.2 ft/s2\)

a)

Generally the equation for Change in Kinetic Energy is mathematically given by

\(dK.E=\frac{1}{2}m(v_1^2-v_2^2)\)

\(500=\frac{1}{2}*\frac{100}{32.2}(v_1^2-v_2^2)\)

\(v_2=35.60ft/sec\)

b)

Generally the equation for Change in Potential Energy is mathematically given by

\(dP.E=mg(h_2-h_1)\)

\(1500=mg(h_2-h_1)\)

\(h_2=45ft\)