What is the dependent variable in an experiment testing the effects of pH on growth of a seed?

a
Seed growth
b
pH
c
Filter paper
d
Type of seed

Answer:

i. Subtract v₀² from both of the equation.

ii. Divide both side of the equation by 2

iii. Divide both side of the equation by (x – x₀)

a = (v² – v₀²) / 2(x – x₀)

Explanation:

v² = v₀² + 2a(x – x₀)

To solve for a in the expression above, do the following:

i. Subtract v₀² from both of the equation.

v² – v₀² = v₀² – v₀² + 2a(x – x₀)

v² – v₀² = 2a(x – x₀)

ii. Divide both side of the equation by 2

(v² – v₀²) /2= 2a(x – x₀)/2

(v² – v₀²) /2 = a(x – x₀)

iii. Divide both side of the equation by (x – x₀)

(v² – v₀²) /2 ÷ (x – x₀) = a(x – x₀)/(x – x₀)

(v² – v₀²) /2 × 1/ (x – x₀) = a

a = (v² – v₀²) / 2(x – x₀)

Answer:

Explanation:

In this problem we are expected to calculate the velocity of Georges movements.

Given data

Total distance covered by  George= 850+250= 1100 meters

Time taken  by  George to cover the total distance= 25 seconds

We know that velocity is, v= distance/ time

Therefore substituting our data into the expression for velocity we have

v= 1100/ 25= 44 m/s

Hence the velocity in m/s is 44

The velocity of George is 44 m/s.

Since

Total distance covered by  George= 850+250= 1100 meters

Time is taken by  George to cover the total distance= 25 seconds

We know that

velocity is, v= distance/ time

So,

v= 1100/ 25

= 44 m/s

Hence the velocity in m/s is 44.

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Answer:

2.27kg

Explanation:

The Potential energy gained = Force gravity× Height

Force gravity on the ball is GPE/ height

56.8/2.5=22.72N

the mass = 22.72/10= 2.27kg

The mass of the ball when the gravitational potential energy of 56.8 J present is 2.27 kg.

The potential energy is the energy by virtue of its position in the effect of gravity.

Given is an exercise ball is on a table 2.5 m above the ground. It has a gravitational potential energy of 56.8 J.

Potential energy = gravity force × height

P.E =mgh

56.8 J = m x 9.8 x 2.5

m = 2.27kg

Thus, mass of the ball is 2.27 kg.

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Answer:

The speed at the end of the track = 27 m/s

The acceleration = 1.2 m/s²

Please find the Δx vs Δt, v vs Δt, a  vs Δt

Explanation:

We have;

x = u·t + 1/2·a·t²

Where;

x = The distance = 300 m

u = The initial velocity = 0 m/s (Ball at rest)

t = The time taken = 22.4 s

Therefore;

300 = 0 + 1/2×a×22.4²

a = 2×300/22.4² = 1.19579 ≈ 1.2 m/s²

v = u + a×t

∴ v = 0 + 1.2 × 22.4 = 26.88 ≈ 27 m/s

Part of the table of values is as follows;

t,                                     x,                                          v

0,                                    0,                                        0

0.4,                                 0.095663,                         0.478316

0.8,                                 0.382653,                          0.956632

1.2,                                   0.860969,                         1.434948

1.6,                                   1.530611,                            1.913264

2,                                     2.39158,                              2.39158

2.4,                                  3.443875,                           2.869896

2.8,                                   4.687497,                          3.348212

3.2,                                   6.122445,                           3.826528

3.6,                                   7.748719,                             4.304844

Answer:

14.64*10^-3 m

Explanation:

given that

Length of the wavelength, λ = 500*10^-9 m

Diameter of the hole, D = 0.5 mm

length of the slit, L = 6 m

W = 2.44 λL / D, where

W = width of the screen in m

λ = wavelength of the light in nm

L = length of the slit in m

D = diameter of the hole in m

on substituting the values, we have

W = (2.44 * 500*10^-9 * 6) / 0.5*10^-3

W = 7.32*10^-6 / 0.5*10^-3

W = 0.01464 mm

or also, 14.64*10^-3 m

Answer:

3. you need to ask your available lab instructors what to do.

4. You immediately have to drop down your cloth and roll it to extinguish the fire or move to the emergency shower if available

5. You have too keep calm and report to the lab instructor but do no shout.

6. Move immediately to the eye rinse basin if available and wash your eyes gently and thoroughly

Answer:

Fundamental units are the units of the fundamental physical quantities in SI system. They are not formed from other units. There are a total of seven fundamental units such as meter, kilogram, ampere, and second. Derived units are those units that are used for derived quantities.

Explanation:

Hope it helps

Explanation:

It is given that, a cross-country skier moves 32 meters westward, then 54  meters eastward, and finally 68 meters westward.

The attached figure shows the whole scenario. He starts walking 32 m west and finally it walks 68 m west.

Let west is negative and east is positive.

Displacement = final position - initial position

= -68 - (-32)

= -36 m

The magnitude of displacement is equal to 30 m westwards.

Explanation:

F = ma

F = m Δv / Δt

F = (1500 kg) (0 m/s − 30 m/s) / 3 s

F = -15,000 N

Answer:

vernier calipers....................

Answer:

d. vernier calipers

Explanation:

manometer is used for measuring pressure

measuring cylinder is for liquids

micrometer can only measure objects less than 2.5 cm (like a  thin wire)

so the answer is vernier calipers, they have a measuring range of 1-15 cm.

Answer:

a person climbs a set of stairs

Explanation:

A person climbing a set of stairs increases his height, which also increases his gravitopotential energy. Gravitopotential energy increases with height as you move further away from the surface of the Earth.

A wind up toy winding down is already expending its stored up potential energy. An apple falling from a tree is already losing its gravitipotential energy. A firecracker that explodes is already using up the potential energy stored in its chemical. All these are cases where the potential energy is decreasing.

This question is asking for the speed of the skateboarder. speed= distance/time. In this question we will do 2/4 in order to get a speed of 0.5 mph.

Answer:

Newtons law of universal gravitation is the phenomena in which Newton said that every particle in environment will attract other particles in the space.  

Explanation:

Newton law of motion and gravitation attract forcefully which is direct proportional to the masses of the particles and inversely proportional to the square of the distances between the centers. Other physicist used Newtons law in research related to motion or to find out the distance between earth and sun. Because this law is about the mass of the objects. When the mas of an object is doubled, the force between the objects get too doubled. When the mass of the two objects is doubled the gravitational pull between these two objects gets doubled. Sir Isaac Newton first gave this law when see fall down an apple from tree.

Formula is : F = G  Mm/r2 Here G is gravitational pull that is constant.

Answer:

Rayon

Wool

Silk Yarn

Explanation:

Rayon

This is Fabric A. Rayon basically burns very quickly even quicker than fabrics like cotton and linen. Its ash is gray in color. The rayon fabric smells of burning paper when it is burnt.

Wool:

This is Fabric B. Wool is basically hard to ignite. It burns slowly. Its ash is dark in color. The wool fabric smells of burning hair when it is burnt.

Silk Yarn:

This is Fabric C. The silk yarn shrinks from the flame when it is burned. It has a grayish black ash. The silk yarn fabric smells burnt meat of  when it is burnt.

Answer:

a = (v² − v₀²) / (2 (x − x₀))

Explanation:

v² = v₀² + 2a(x − x₀)

Subtract v₀² from both sides.

v² − v₀² = 2a(x − x₀)

Divide both sides by 2 (x − x₀).

(v² − v₀²) / (2 (x − x₀)) = a

Answer:

To indicate that energy has been added or removed as heat or work to a system, the internal energy of the system is calculated.

This is because:

1- the internal energy follows the formula:

ΔU = Q - W

2- the internal energy is indicated by any alternation in temperature

Therefore, the answer is:

internal energy

Answer:

170km/hr

Explanation:

Vav=v1+v+v3.....

A car travels for an hour at a speed of 20 km/hour, the next two hours at a speed of 65 km/hour, and the final hour at a speed of 85 km/hour, then the average speed of the car in the entire trip would be  56.25 kilometers/hour.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem,if a car travels for an hour at a speed of 20 km/hour, the next two hours at a speed of 65 km/hour, and the final hour at a speed of 85 km/hour,

The total distance traveled by car =  20×1 + 65×2 +85×1

                                                        =225 kilometers

The total time taken by the car = 4  hours

The avearge speed of the car = 225/4

                                                    =56.25 kilometers/hour

Thus,the average speed of the car would be 56.25 kilometers/hour.

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Answer:

Walked on a circular nature trail

Explanation:

We are told that you walked 3 miles.

Now, we are also told that the reference point used to calculate the total distance that you walked was the same as the ending point.

For, one to end up at the same place where he started a journey using the same reference point, it means the journey was not a straight line but a circle because the radius would have to be constant for that to happen.

Thus, it means you walked on a circular nature trail.

Answer:

The answer is "4".

Explanation:

The luminaire would be recessed inside a wall, so that, dependent on the surface mountings, its top-level is flush with the ceiling. It is the hanging under the primary structural, in which the drop was an area of the above falling ceiling, that referred to its full space, because it will be generally used for the HVAC air return and the total space is also used to obfuscate piping, cabling, and ducts, that's why the middle-to-middle spacing of curved lighting systems would have to be in incremental increases of 4 ft.

Answer:

d) atoms share electrons

Explanation:

Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bond. Atoms with large differences in the electronicnegativity transfer electron's to form ions. The ions are then attracted to each other.

Answer:

D.

Explanation:

edge

Answer:

x=-2 and y=3

Explanation:

Isolate y and then x to get: y=13+5(-2)

Simplify to get y=3 then plug it back in to get x=-2

We can check, 9+ (-4)=5 hope this helps

Explanation:

32. The area under the curve from t = 0 and t = 2 is the area of the triangle.  The base of the triangle is 2 seconds, and the height of the triangle is 2 m/s.  The area is therefore:

A = ½ bh

A = ½ (2 s) (2 m/s)

A = 2 m

33. The car is not moving when the velocity is 0 m/s.  This occurs at t = 0, t = 6, and t = 10.

Answer:

The required answer is 35100

Answer:

35100mg

Explanation: When converting bigger to smaller units, we move the decimal point to the right side. As there are 6 zeroes, The decimal point will move six places to the right. Therefore answer id 35100mg

Explanation:

F = mv²/r

If the velocity is halved:

F' = m(v/2)²/r

F' = ¼ mv²/r

F' = ¼ F

The centripetal force is reduced by a factor of 4.

Answer:

1.15×10⁶ J

Explanation:

Heat needed to bring the ice to 0°C:

q = mCΔT

q = (3 kg) (2100 J/kg/K) (0°C − (-2°C))

q = 12,600 J

Heat needed to melt the ice:

q = mL

q = (3 kg) (3.36×10⁵ J/kg)

q = 1,008,000 J

Heat needed to bring the water to 10°C:

q = mCΔT

q = (3 kg) (4200 J/kg/K) (10°C − 0°C)

q = 126,000 J

The total heat is:

q = 12,600 J + 1,008,000 J + 126,000 J

q = 1,146,600 J

q = 1.15×10⁶ J

Answer:

(D. Gestalt psychology) , is the school of psychology that believes perception is more than the sum of its parts, it involves a whole pattern .

This type of school of psychology studied how all components of sensations are assembled into one's perception .

hope this helps :)

Answer:

Gestalt psychology is the school of psychology that believes perception is more than the sum of its parts—it involves a whole pattern.

Answer:

2u

Explanation:

2u

W = Vq

q = CV

W = V.CV

W = CV²

W/C = V²

V = √(W/C)

√(W1/C1) = √(W2/C2)

√(u/c) = √(x/2c)

x = 2u

Explanation:

When spring is used to shoot an arrow, the Elastic Potential Energy is converted into Kinetic Energy.

The efficiency of Spring Toy = 69%

According to Conservation of Energy :

P. E. = K. E.

NOW,

69% of P. E. = m * v^2 / 2

[tex]P.E. = \frac{0.0342 \times 5.5 \times 5.5}{2 \times 0.69} = 0.75J[/tex]

Answer:

because speed is the modulus of velocity which is a vector

the velocity to be zero it must be a round trip

Explanation:

This is because speed is the modulus of velocity which is a vector.

For the velocity to be zero it must be a round trip, therefore the resulting vector zero

On the other hand, the speed of the module is the same in both directions