Given the hypothesis that the element zinc prevents cancer, which of the following procedures BEST exemplifies the nature of scientific investigation?

A- Analyze zinc, looking for different forms

B- Do research on zinc and its uses throughout history to determine if there is evidence that zinc prevents incidence of cancer


C- Rely on testimony of friends and relatives, as well as conduct a survey to see if there is a concentration of cancer in the people not taking zinc supplements


D- Give zinc supplements to a group of rats and not to another group. After a period of time, determine if there is a higher incidence of cancer in the control group​

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 100 × 4

We have the final answer as

Hope this helps you

Answer:

We know that the speed of sound is 343 m/s in air

we are also given the distance of the boat from the shore

From the provided data, we can easily find the time taken by the sound to reach the shore using the second equation of motion

s = ut + 1/2 at²

since the acceleration of sound is 0:

s = ut + 1/2 (0)t²

s = ut    (here, u is the speed of sound , s is the distance travelled and t is the time taken)

Replacing the variables in the equation with the values we know

1200 = 343 * t

t = 1200 / 343

t = 3.5 seconds (approx)

Therefore, the sound of the gun will be heard at the shore, 3.5 seconds after being fired

The statements that is true about the car and the truck is "The car's measurement is a scalar, and the truck's measurement is a vector"

third option is the correct answer.

Scalar quantities are those quantities that can be described by magnitude only.

These type of quantity has no direction, but can be effectively described by direction only.

Examples of scalar quantities include the following;

Vector quantities are those type of quantity which can be described by both quantity and direction.

Examples of vector quantities include the following:

Speedometer is a device used in measuring the speed of a car, hence the measurement of the car is scalar. The speed of the truck has direction (next lane), so it can be effectively regarded as vector quantity.

Thus, the speed of the truck has both magnitude and direction and can be called vector measurement.

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Answer: The distance covered by a certain object which is travelling at a certain speed is calculated through the equation,

    d = (V₀)t + 0.5at²

where d is the distance, V₀ is the initial speed, a is deceleration, and t is the time. Substituting the known values,

   85 = (V₀)(t) + (0.5)(-0.43 m/s)(t²)

Because we are not given with the initial velocity, our answer would remain as the equation which is written above.

Explanation: Hope this helps

A) The tangential (linear) velocity of each shape is:

For the ring: v = rω = 2.41 m/s.

For the sphere: v = rω = 1.57 m/s.

For the solid cylinder: v = rω = 2.41 m/s.

B) The linear acceleration of each shape is:

For the ring: α = 2gsinθ/(3r(1 + 0.3) + 2R) = 1.191 m/s^2.

For the sphere: α = 2gsinθ/(5r(1 + 0.3)) = 1.176 m/s^2.

For the solid cylinder: α = 2gsinθ/(3r(1 + 0.3) + 2R) = 1.228 m/s^2.

C) The solid cylinder has the greatest moment of inertia.

D) The time taken for each shape to reach the bottom of the slope is:

For the ring: t = 0.576 s.

For the sphere: t = 0.197 s.

For the solid cylinder: t = 0.576 s.

E) The sphere will reach the bottom of the slope first, followed by the ring and the solid cylinder.

Answer:

g = 0.0114 m/s²

Explanation:

The value of acceleration due to gravity on the surface of the moon can be given by the following formula:

\(g = \frac{Gm}{r^2}\)

where,

g = acceleration due to gravity on the surface of moon = ?

G = Universal Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²

m = mass of moon = 4.2 x 10¹⁶ kg

r = radius of moon = 1.57 x 10⁴ m

Therefore,

\(g= \frac{(6.67\ x\ 10^{-11}\ N.m^2/kg^2)(4.2\ x\ 10^{16}\ kg)}{(1.57\ x\ 10^4\ m)^2}\)

g = 0.0114 m/s²

current X delivers more charge,it delivers 0.48 C more of charge

Current can be calculated using the formula:

so

Step 1

find the charge on situation (current X)

a)let

b) now, replace in the formula and solve for Q

Step 2

find the charge in situation(current Y)

a) let

b) now , replace in the formula and solve for Q

Step 3

now,

a) compare

b)finally, find the difference in the charges

therefore, the answer is

current X delivers more charge,it delivers 0.48 C more of charge

I hope this helps you

Answer:

128 is the ans cuz N is also lnown as mass

Explanation:

128

Use the work-energy theorem: the total work done on the 0.80 kg block by the spring to make it come to a stop is equal to the change in the block's kinetic energy.

If we take the block's initial direction of motion to be positive, then the spring does negative work on the block, and

-1/2 k (0.11 m)² = 0 - 1/2 (0.80 kg) (2.2 m/s)²

Solve for the spring constant k :

k = (1/2 (0.80 kg) (2.2 m/s)²) / (1/2 (0.11 m)²) = 320 N/m

We can use the same equation as above to find the distance the 1.40 kg block would travel as it is slowed down by the same spring:

-1/2 (320 N/m) x ² = 0 - 1/2 (1.40 kg) (3.0 m/s)²

Solve for the displacement x :

x = √((1/2 (1.40 kg) (3.0 m/s)²) / (1/2 (320 N/m))) ≈ 0.20 m

If airflow lifts a 3.6 kg bird 50 m up, then the work done by the airflow is 1764 joules.

Given,

Work done against the friction (W) =?

We know that :

Work done against the friction (W) = force × displacement

W = F × d

W = m × g x d        [ Force = mass × acceleration due to gravity ]

W = 3.6 × 9.8 × 50      [ g = 10 m/s2 ]

W = 1764 joules

Hence,  the work done by the airflow is 1764 joules.

A force is an influence that has the power to alter an object's motion. A force can cause an object with mass to accelerate when it changes its velocity, for as when it moves away from rest.

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Answer:

a variable (often denoted by x) whose variation does not depend on that of another.

Explanation:

Answer:

D. 10 atoms

Explanation:

The answer for the experiment is obtained by the principle of Newton's law of cooling. The initial temperature of the Room is taken as 32°C.

The ice cubes are mixed with room-temperature water, the ice starts to melt and the water becomes cold. This is because the ice and water have two different temperatures and when they are mixed there is an exchange of heat is taken place. When the ice cubes mixed with water the room temperature is decreases from 32°C. After stirring the mixture because of the heat released, the temperature increases.

When the ice-water mixture is stirred, the heat energy is evolved which melts the ice in the mixture, and therefore the temperature increases gradually. And stirring of water for every 5 minutes leads ice cubes to melt completely to form water and the level of water increases in the final stage. This was given by Newton's law of cooling.

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The runner is running the fastest in Graph B because of the graph's steepest slope. Graph B is the solution as a result.

The slope, or steepness, of each line shows the velocity of the item. In general, the steeper the slope, the faster an object moves. A straight line denotes constant speed, whereas changes in slope over time denote varying speeds.

A position-time graph's slope serves as a proxy for velocity. The rate of change of motion increases with slope steepness. A negative slope indicates that the object is moving backward or in the opposite direction, or that the velocity is negative.

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Explanation:

Density = mass / volume

ρ = 11.1 g / 44.5 mL

ρ = 0.249 g/mL

The magnitude of the magnetic field B must change at a rate of approximately -2.6675 T/s to induce a current of 0.1 A in the windings of the coil.

To find the rate at which the magnitude of the magnetic field B must change, we can use Faraday's law of electromagnetic induction. The formula is:

EMF = -N * (ΔΦ/Δt)

where EMF is the induced electromotive force, N is the number of turns in the coil, ΔΦ is the change in magnetic flux, and Δt is the change in time.

We know that EMF = I * R, where I is the induced current and R is the resistance. In this case, I = 0.1 A and R = 8 Ω, so:

EMF = 0.1 A * 8 Ω = 0.8 V

Now we can find the change in magnetic flux (ΔΦ). The magnetic flux (Φ) through a rectangular coil is given by:

Φ = B * A

where A is the area of the coil. The area of the rectangular coil is 5 cm * 8 cm = 40 cm², or 0.004 m² when converted to square meters.

Since we want to find ΔΦ/Δt, we can rearrange Faraday's law:

ΔΦ/Δt = -EMF / N

Plugging in the values, we get:

ΔΦ/Δt = -0.8 V / 75 turns = -0.01067 Vs/turn

Now we can find the rate of change of the magnetic field (ΔB/Δt):

ΔB/Δt = (ΔΦ/Δt) / A

ΔB/Δt = -0.01067 Vs/turn / 0.004 m² = -2.6675 T/s

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Option C, Because of the wavelength of radio waves and other forms of electromagnetic radiation, diffraction is most likely to occur as the wave travels through a classroom doorway.

Diffraction is the bending of waves around barriers or through apertures that are equivalent to or smaller than the wavelength of the wave.

Because radio waves have longer wavelengths than visible light and X-rays, they are more likely to diffract while passing through a similar-sized aperture, such as a classroom doorway.

Because X-rays have considerably shorter wavelengths and visible light has wavelengths in between, diffraction is less likely to occur in this scenario for these forms of electromagnetic energy. As a result, option C is the right answer.

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Therefore, the angle between the direction of F and due north is 41.32 degrees.

Angle is a geometric concept that describes the relationship between two lines or surfaces that meet or cross at a certain point. It is measured in degrees, and is usually indicated by the Greek letter "θ". An angle can be classified as acute, right, obtuse, reflex, or straight, depending on the size of the angle. Angles can also be classified as complementary, supplementary, vertical, adjacent, and congruent.

c^2 = a^2 + b^2 - 2ab cos(x)

where c is the magnitude of the displacement vectors (55 m and 46 m), a and b are the magnitudes of the corresponding sides of the triangle (55 m and 46 m) and x is the angle we are trying to find.

Substituting in the values, we get:

55^2 = 46^2 + 55^2 - 2(46)(55)cos(x)

Solving for cos(x), we get:

cos(x) = (55^2 - 46^2) / (2(46)(55)) = 0.7261

Taking the inverse cosine of both sides gives us x = 41.32 degrees.

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The magnitude of the power dissipated in resistor R4 is approximately 10,028 watts.

To find the power dissipated in resistor R4, use the formula:

P = I² × R

where P = power, I = current flowing through the resistor, and R = resistance of the resistor.

The total resistance, Rt, can be calculated using the formula:

1/Rt = 1/R1 + 1/R2 + 1/R3

Substituting the given values:

1/Rt = 1/3 + 1/0.8 + 1/2

Simplifying the equation:

1/Rt ≈ 1.6667

Rt ≈ 0.6 Ω

Next, calculate the total voltage, Vt, by summing the individual voltage sources:

Vt = ε1 + ε2 + ε3

Substituting the given values:

Vt = 9 + 6 + 4

Vt = 19 V

Now calculate the current flowing through resistor R4 using Ohm's Law:

I = Vt / Rt

Substituting the calculated values:

I = 19 / 0.6

I ≈ 31.6667 A

Finally, calculate the power dissipated in resistor R4:

P = I² × R4

Substituting the calculated values:

P = (31.6667)² × 10

P ≈ 10,028 W

Therefore, the magnitude of the power dissipated in resistor R4 is approximately 10,028 watts.

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Answer:

Its gonna be (Guided)

Have a nice day <3

They pick up speed and move away from the usual.

Using meter sticks, a group of pupils makes a straight line (shoulder to shoulder) and connects to their closest neighbor. Two media are separated in the room by a strip of masking tape. Students can be seen moving normally in one of the media (on one side of the tape). The kids in the other medium (or on the opposite side of the tape) move very slowly and in baby stages. The class moves in the union in a straight line in the direction of the diagonal piece of masking tape. As they get close to the masking tape, the pupils stay in line. Each pupil immediately changes the speed of her or his walk as she or he reaches the tape.

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Answer:

Time taken to stop = 6 sec

Explanation:

Given:

Rotation of wheel = 1.10 × 10² rev/min

Final velocity (v) = 0

Angular acceleration (a) = - 1.92 rad/s²

Find:

Time taken to stop

Computation:

Initial velocity (u) = (1.10 × 10² × 2π rad) / 60 sec

Initial velocity (u) = 11.52 rad / sec

We know that,

V = U +at

t = (v-u)a

t = (0 - 11.52) / (-1.92)

Time taken to stop = 6 sec

Hello..! :)

We first apply the data to the problem.

Data:

Now, we convert km/h to m/s.

Conversion:

Then, we apply the formula that is.

Formula:

Finally we develop the problem.

Developing:

The distance covered is 2737.26 meters.

¿Doubts? On the comments. Greetings :D

Answer:

2737.5 m

Explanation:

\(\boxed{\sf Speed=\dfrac{Distance}{Time}}\)

Given values:

Convert kilometers per hour into meters per second by dividing by 3.6:

\(\implies \sf Speed=\dfrac{365}{3.6}=\dfrac{3650}{36}=\dfrac{1825}{18}\; m/s\)

Substitute the values into the formula and solve for distance:

\(\implies \sf \dfrac{1825}{18}=\dfrac{Distance}{27}\)

\(\implies \sf Distance=\dfrac{1825\times27}{18}\)

\(\implies \sf Distance=\dfrac{49275}{18}\)

\(\implies \sf Distance=\dfrac{5475}{2}\)

\(\implies \sf Distance=2737.5\;m\)

Answer:

When the lines (representing peaks) pass over each other, constructive interference occurs. To put it another way, when two waves are in phase, they constructively interfere. When two waves are entirely out of phase (a peak lies in the middle of two waves), destructive interference ensues.

Explanation:

Question↓

Which of the following is required for a liquid to become a solid?

Answer↓

an increase in kinetic energy Is The Answer

Particles in the liquid state move faster than particles in the solid state. Therefore, they have more kinetic energy.

xXxAnimexXx

have a great day!!! ^ω^

The lenght of the missing side is 29.41 ft.

To calculate the missing length of the triangle, we use pythagoras theorem.

Pythagoras theorem states that in a right angle triangle, the square the hypotenus is equal to the sum of the square of the two other sides.

These can be expressed mathematically as

From the question,

Substitute these values into equation 1

Hence, the lenght of the missing side is 29.41 ft.

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For a longitudinal wave, the compression region, is the one represented by the densely packed particles with high pressure and the region with loosely packed particles is called rarefaction. Hence, the first part is C he dense region and the second one with some space between the dots is labeled as R.

Longitudinal waves are a type of mechanical waves passing through a medium. Unlike electromagnetic waves, they cannot be passed through vacuum.

In a longitudinal wave, the oscillation of particles is along the direction of wave propagation. The wave is composed of high pressure regions and low pressure regions called compressions and rarefactions respectively.

The regions where, particles are densely packed and shows the thick dote are labelled as compressions and the regions where, some space between particles are labeled as rarefactions.

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From the histogram given, there were at approximately 7 downloads between 3pm and 4pm . This can be derived by counting the rows in that time period.

A histogram is a graph that depicts the frequency distribution of a few data points from a single variable.

Histograms frequently divide data into "bins" or "range groups" and count the number of data points that belong to each of those bins.

Histograms are frequently used to depict the key properties of data distribution in a handy format. It is especially beneficial when working with huge data sets (more than 100 observations). It can aid in the detection of uncommon observations (outliers) or gaps in the data.2

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Answer:

We are given:

V1 = 5.5L          T1 = -38 C   or   235 k

V2 = 1.3L           T2 = T

From the gas equation:

PV = nRT

Since the pressure (P) , number of moles (n) and the universal gas constant (R) are constants, we can write the same equation as:

V / T = k  (where k is a constant)

so a bit more insight, since the values noted above are constant, when multiplied by each other, they will provide us with a constant number irrespective of the value of the variables

Changing the variables for the first case:

V1 / T1 = k   (where k is the same constant) ----------------(1)

Similarly,

V2 / T2 = k  (again, k has the same value)----------------(2)

From (1) and (2):

k is the common value

V1 / T1 = V2 / T2

Replacing the variables

5.5 / 235 = 1.3 / T

T = 1.3 * 235 / 5.5

T = 55.54 k

Therefore, at 55.54 K the gas will have a volume of 1.3L