Which statement is true? (2 points)
The combustion of biomass can replace fossil fuels in conventional power plants.
Hydroelectric energy uses the energy from the sun, which is a renewable resource.
Oil is a non-renewable resource that is hardly ever used, so there is not a concern of depleting the Earth's supply.
Solar energy is a non-renewable resource that is used by many countries all over the world.

(A) The image you see of yourself in the shiny tablespoon is inverted.

(B) The image you see of yourself in the shiny tablespoon is reduced.

(C) The image you see of yourself in the shiny tablespoon is virtual.

A) When you look at the front side of the spoon, the light rays reflecting off your face or any other object get reflected by the curved surface of the spoon. This reflection follows the laws of reflection, resulting in an inverted image. Therefore, the image you see of yourself in the spoon is inverted.

B)  In this case, the shiny tablespoon acts as a concave mirror. Concave mirrors can produce reduced images depending on the position of the object relative to the mirror's focal point. When the object is held at arm's length, the image formed in the spoon is smaller in size compared to the actual object. Hence, the image you see of yourself in the spoon is reduced.

C) A virtual image is formed when the light rays do not physically converge at the location of the image. In the case of a spoon, the reflected rays from the curved surface do not intersect to form a real image that can be projected onto a screen. Instead, your eyes perceive the apparent image formed by the reflected rays, which is known as a virtual image. Therefore, the image you see of yourself in the spoon is virtual.

Option (A) inverted, (B) reduced, and (C) virtual are the correct answers.

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Answer:

Initial velocity (u) = 40 m/s

Distance travel in last 5 seconds = 100 m

Explanation:

Given:

Acceleration (a) = 8 m/s²

Final velocity (v) = 0 m/s

Find;

1] Initial velocity before 5 sec

2] Distance travel in last 5 seconds

Computation:

1] Initial velocity before 5 sec

v = u + at

0 = u + (-8)(5)

u - 40 = 0

Initial velocity (u) = 40 m/s

2] Distance travel in last 5 seconds

s = ut + (1/2)(a)(t²)

s = (40)(5) + (1/2)(-8)(5²)

s = 200 - 100

Distance travel in last 5 seconds = 100 m

If the magnetic field were to be flipped so that it points in the opposite direction, the stream of negatively-charged particles would experience an upward force.

In order to make the stream of negatively-charged particles experience an upward force, we need to change the direction of either the particle stream or the magnetic field. Here's a step-by-step explanation:

1. The original situation: The negatively-charged particles are moving to the right and experience a downward force due to the magnetic field.
2. Change the direction of the particle stream: If you reverse the direction of the particle stream (i.e., make the particles move to the left instead of right), the force they experience will also reverse and become upward.
3. Change the direction of the magnetic field: If you reverse the direction of the magnetic field, the force on the negatively-charged particles will change direction and become upward, while they continue to move to the right.

So, to achieve an upward force on the particle stream, you can either reverse the direction of the particle stream or reverse the direction of the magnetic field.

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It will take approximately 2.77 seconds before the motorcycle is moving as fast as the car.

To determine the time elapsed before the motorcycle is moving as fast as the car, we can use the equation of motion:

v = u + at

where:

v is the final velocity,

u is the initial velocity,

a is the acceleration,

t is the time.

Given:

Initial velocity of the motorcycle (umotorcycle) = 0 m/s (since it takes off at the instant the car passes it)

Acceleration of the motorcycle (amotorcycle) = 7.0 m/s²

Initial velocity of the car (ucar) = 70 km/h = 70,000 m/3600 s ≈ 19.44 m/s

Let's assume the final velocity of the motorcycle (vmotorcycle) is the same as the final velocity of the car (vcar), which is 19.44 m/s.

Using the equation of motion, we can rearrange it to solve for time (t):

t = (v - u) / a

For the motorcycle:

tmotorcycle = (vmotorcycle - umotorcycle) / amotorcycle

Plugging in the values:

tmotorcycle = (19.44 m/s - 0 m/s) / 7.0 m/s²

tmotorcycle ≈ 2.77 s

Therefore, it will take approximately 2.77 seconds before the motorcycle is moving as fast as the car.

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Answer:

89 i would say

Explanation:

Answer:

B. 44.1

Explanation:

We can use the equation y=1/2gt^2 to find the distance in the vertical direction, where y= distance in the vertical direction, g=acceleration due to gravity, and t=time

we only know acceleration due to gravity(9.8m/s^2),

plug in known variables,

y=1/2*9.8*t^2

we still need to plug in the time variable.

In order to do that, we an use the s=d/t equation and re arrange that formula to get: t=d/s, where t=time, d=distance, and s=speed.

plug in known variables,

t=60/20

t=3

now that we know the time, we can plug that into our original equation

y=1/2*9.8*3^2

simplify,

y=4.9*3^2

y=4.9*9

y=44.1m

Thus, B is your answer

Answer:

J = 500 kg-m/s

Explanation:

Given that,

Initial speed of the motor, u = 5 m/s

Final speed of the motor, v = 7 m/s

Mass of the boat, m = 250 kg

We need to find the impulse applied by the motor. We know that impulse is equal to the change in momentum. It is represented by letter J.

J = m(v-u)

J = 250 (7-5)

J = 500 kg-m/s

Hence, the impulse applied by the motor is 500 kg-m/s.

The ratio of time of flight for inelastic collision to elastic collision is 1:2

The given parameters;

Considering inelastic collision, the final velocity of the system is calculated as;

\(m_1u_1 + m_2u_2 = v(m_1 + m_2)\\\\m_1u_1 + 0 = v(m_1 + m_2)\\\\v= \frac{m_1u_1}{m_1 + m_2} \ -- (1)\\\\\)

The time of motion of the system form top of the table is calculated as;

\(v = u + gt\\\\v = 0 + gt\\\\v = gt\\\\t= \frac{v}{g} \\\\t_A = \frac{m_1u_1}{g(m_1 + m_2)} \ \ ---(2)\)

Considering elastic collision, the final velocity of the system is calculated as;

\(m_1u_1 + m_2 u_2 = m_1v_1 + m_2v_2\\\\m_1u_1 + 0 = m_1v_1 + m_2v_2\\\\m_1 u_1 = m_1v_1 + m_2v_2\)

Apply one-directional velocity

\(u_1 + (-v_1) = u_2 + v_2\\\\u_1 -v_1 = 0 + v_2\\\\v_1 = v_2 -u_1\)

Substitute the value of \(v_1\) into the above equation;

\(m_1u_1 = m_1(v_2 - u_1) + m_2 v_2\\\\m_1u_1 = m_1v_2 -m_1u_1 + m_2v_2\\\\2m_1u_1 = m_1v_2 + m_2v_2\\\\2m_1u_1= v_2(m_1 + m_2)\\\\v_2 = \frac{2m_1u_1}{m_1+ m_2} \ --(3)\)

where;

\(v_2\) is the final velocity of the block after collision

Since the bullet bounces off, we assume that only the block fell to the ground from the table.

The time of motion of the block is calculated as follows;

\(v_2 = v_0 + gt\\\\v_2 = 0 + gt\\\\t = \frac{v_2}{g} \\\\t_B = \frac{v_2}{g} \\\\ t_B = \frac{2m_1u_1}{g(m_1 + m_2)} \ \ ---(4)\)

The ratio of time of flight for inelastic collision to elastic collision is calculated as follows;

\(\frac{t_A}{t_B} = \frac{m_1u_1}{g(m_1 + m_2)} \times \frac{g(m_1 + m_2)}{2m_1u_1} \\\\\frac{t_A}{t_B} = \frac{1}{2} \\\\t_A:t_B = 1: 2\)

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Answer:

Design 2

Explanation:

I had this same question

My answer:

"Design 2 is the well-designed one, because the air molecules are the most compact and could protect the individual better than 1,3,and no air bag."

The total cooling degree days (CDDs) of the two days is -10 CDDs. This is because the base temperature for cooling degree days is 65 degrees Fahrenheit, and both days had temperatures below 65 degrees Fahrenheit.

Cooling degree days (CDDs) are a measure of how much cooling is needed to maintain a comfortable indoor temperature.

They are calculated by subtracting the base temperature from the average temperature for a day or a period of days. The base temperature for cooling degree days is typically 65 degrees Fahrenheit.

In this case, the average temperature for day 1 is 45 degrees Fahrenheit and the average temperature for day 2 is 75 degrees Fahrenheit. Subtracting the base temperature from each average temperature gives us:

Day 1: 45 degrees Fahrenheit - 65 degrees Fahrenheit = -20 degrees Fahrenheit

Day 2: 75 degrees Fahrenheit - 65 degrees Fahrenheit = 10 degrees Fahrenheit

The total cooling degree days for the two days is the sum of the cooling degree days for each day, or -20 degrees Fahrenheit + 10 degrees Fahrenheit = -10 degrees Fahrenheit.

CDD_day_1 = 45 degrees Fahrenheit - 65 degrees Fahrenheit = -20 degrees Fahrenheit

CDD_day_2 = 75 degrees Fahrenheit - 65 degrees Fahrenheit = 10 degrees Fahrenheit

total_CDDs = CDD_day_1 + CDD_day_2 = -20 degrees Fahrenheit + 10 degrees Fahrenheit = -10 degrees Fahrenheit

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The mass of a blow dart that experiences a blowing force of 0.20 Newtons and travels the length of the 1.2 meter barrel in 0.04 seconds is 0.26 g

a = v / t

v = d / t

a = Acceleration

v = Velocity

d = Distance

t = Time

d = 1.2 m

t = 0.04 s

v = 1.2 / 0.04

v = 30 m / s

a = 30 / 0.04

a = 750 m / s²

According to Newton's second law of motion,

F = m a

F = Force

m = Mass

F = 0.2 N

m = F / a

m = 0.2 / 750

m = 2.6 * \(10^{-4}\) kg

m = 0.26 g

Therefore, the mass of a blow dart is 0.26 g

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-50 m/sec is the change in the velocity. Correct option is: d

A particle or object moves with respect to time while moving at a certain speed, which is expressed vectorially as velocity. The metre per second (m/s) is the accepted unit of velocity magnitude (also known as speed). Alternately, the amount of velocity can be expressed in centimetres per second (cm/s).

Speed is denoted by the letter v (italic), whereas velocity is denoted by the letter V (boldface). A bar is added above the symbol for average values as well.

A vector quantity called velocity (v) measures displacement over time (Δt), or the change in position (Δs).

Given that,

A baseball is traveling ( 20 m/s) and is hit by a bat

it leaves the bat traveling (−30 m/s).

Now calculate the change in velocity:

Δv = v₂ - v₁

or, Δv = (-30) - 20

or, Δv = - 50 m/sec

It acts on the negative direction.

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In the actual case where there is water inside the eye, the lens needs to be stronger than if there were only air in our eyes.

This is because the refractive index of water is higher than that of air, meaning that light will bend more when it passes through water than when it passes through air. This makes it harder for the eye to focus light onto the retina, and so a stronger lens is needed to compensate for this increased bending.

If there is also water outside the eye, such as when we are underwater, we need to wear goggles to provide a layer of air in front of our eyes, which allows light to be refracted less and therefore makes it easier to see clearly.

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Answer:

Yes please

Explanation:

A high albedo indicates that a planetary object reflects a significant amount of incoming sunlight back into space.

Albedo is a measure of the reflectivity of a surface. It quantifies the fraction of solar radiation that is reflected by an object compared to the total amount of radiation incident upon it. Albedo is expressed as a value between 0 and 1, where 0 represents a perfectly absorptive (dark) surface that reflects no light, and 1 represents a perfectly reflective (bright) surface that reflects all incident light. When a planetary object, such as a planet or moon, has a high albedo, it means that it reflects a large portion of the sunlight it receives. This indicates that the surface of the object is relatively bright and does not absorb much of the incoming solar radiation. Instead, it reflects a significant amount of light back into space.

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With α = .05, the two-tailed critical region for a t test using a sample of n = 20 participants would have boundaries of t < -2.093 and t > 2.093.

Explanation:

A t-test is a hypothesis test that compares the means of two sets of data.

A t-test helps to understand whether the mean value of a variable is different from a specific value or not. The following are the steps to perform a t-test:

Step 1:

Define a null and alternative hypothesis.

Step 2:

Determine the level of significance.

Step 3:

Calculate the test statistic.

Step 4:

Determine the critical value of the test statistic.

Step 5:

Decide the conclusion based on the calculated test statistic and critical value.

A critical region is a range of values that will lead to the rejection of the null hypothesis. For a two-tailed test with α = .05, the critical region would have area α/2 = .025 in each tail of the distribution.

The boundary values for a two-tailed test with 20 degrees of freedom and α = .05 can be found using a t-distribution table or a statistical software.

The critical value is t = ±2.093, which indicates that the critical region for the test would be t < -2.093 or t > 2.093.

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Answer:

0.05

Explanation:

You should list the choices.

Efficiency = energy used / energy need * 100%

Efficiency = 5%

energy used = ?

energy needed = 1

Formula

Efficiency = energy used/energy needed * 100

100 * efficiency * energy needed = energy used.

Solution

1.00 * 5% = 1.00 * 5/100 = 1.00 * 0.05 = 0.05

Your answer should be something resembling 0.05 Joules

The negative plate is the one facing us because the electric field between the plates is zero, which can only happen if the two plates have the same magnitude and opposite sign of charge density.

Charge density is the amount of electric charge per unit area or per unit volume of a material or object. It is usually denoted by the symbol ρ and is measured in units of coulombs per square meter (C/m²) or coulombs per cubic meter (C/m³).

In the case of a charged plate, the charge density is the total charge on the plate divided by its surface area. For example, if a plate has a charge of 60 µC and an area of 2 m², then the charge density is:

Charge density = 60 µC / 2 m² = 30 µC/m²

Charge density is an important concept in electrostatics, as it is used to describe the distribution of electric charge over a surface or within a volume. It is also used in the calculation of electric fields and forces in electrostatics, as the electric field depends on the charge density of the objects producing the field.

Two large, charged plates with charge density ±30µC/m² facing each other with a separation of 5.0 mm.

One of the plates has a negative charge density.

We want to find out which plate is negative

1. Calculate the total charge on one of the plates using the charge density and the area of the plate:

Q = ±30 µC/m² * A

Here, A is the area of one of the plates.

2. Calculate the electric field due to each plate using Coulomb's law:

E = (1/4πε₀) * (Q / r²)

Here, r is the distance between the plates, which is 5.0 mm or 0.005 m.

ε₀ is the permittivity of free space, which is a constant and has a value of 8.85 x 10⁻¹² F/m.

Since there are two plates, calculate the electric field due to each plate and then take the difference between them to get the net electric field between the plates.

3. Substitute the values and calculate the electric field due to each plate:

E1 = (1/4πε₀) * (Q / r²)

E2 = (1/4πε₀) * (Q / r²)

Here, E1 is the electric field due to one plate, and E2 is the electric field due to the other plate. Since the plates have the same magnitude of charge density, their charges will have the same magnitude too, so we can drop the absolute value sign in Coulomb's law.

4. Subtract the electric field due to one plate from the electric field due to the other plate to get the net electric field:

E = E1 - E2

E = 0

Since, the net electric field is zero, this means that the electric field due to one plate is equal in magnitude and opposite in direction to the electric field due to the other plate. Therefore, the plates must have the same magnitude of charge and opposite signs of charge density.

5. Since, one of the plates has a negative charge density is known, this means that the negative plate is the one facing us. Therefore, the negative plate is the one that we were asked to identify.

Therefore, the negative plate is the one facing us.

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Answer:

The final equilibrium temperature is approximately 26.69 °C

Explanation:

The heat transferred, ΔQ, from a hot body to a cold one is given by the following formula;

ΔQ = m·c·ΔT

Where;

m = The mass of the body

c = The specific heat capacity of the body

ΔT = The temperature change of the body

The given mass of the gold bar, m₁ = 20.0 kg

The initial temperature of the gold bar, T₁ = 35.0 °C

The specific heat capacity of gold, c₁ = 0.13 kJ/(kg·K)

The mass of the glass container, m₂ = 0.8 kg

The initial temperature of the glass container, T₂ = 15°C

The specific heat capacity of glass, c₂ = 0.792 kJ/(kg·K)

The mass of the added water, m₃ = 2.0 kg

The initial temperature of the added water, T₃ = 25°C

The specific heat capacity of water, c₃ = 4.2 kJ/(kg·K)

The heat lost by the gold = The heat gained by the glass and the water

Let 'T' represent the temperature at the final equilibrium, we have;

m₁·c₁·ΔT₁ = m₂·c₂·ΔT₂ + m₃·c₃·ΔT₃

Where;

ΔT₁ = T₁ - T

ΔT₂ = T - T₂

ΔT₃ = T - T₃

∴ 20.0 × 0.13 × (35 - T) = 0.8 × 0.792 × (T - 15) + 2.0 × 4.2 × (T - 25)

Expanding and collecting like terms (using a graphing calculator) gives;

91 - 2.6·T = 9.0336·T - 219.504

9.0336·T + 2.6·T = 219.504 + 91 = 310.504

11.6336·T = 310.504

T = 310.504/11.6336 ≈ 26.69

The final equilibrium temperature, T ≈ 26.69 °C.

Mass = density • volume

so (12)(920)(kg/m^3•m^3)

11040 kg

Answer:

Phones as sunglasses with a mic. I put on my glasses and I say what's the weather today, The sunglasses will tell me the weather and can be charged just like phones

Explanation:

When a test charge is brought near an insulating or conducting ball, it will experience attraction or repulsion depending on the charge of the ball. By measuring the force experienced by the test charge, it is possible to determine the charge on the insulating or conducting ball.

In the case of insulating balls, the charge is determined by rubbing the balls with a material that can transfer charge. This process is called charging by friction. The insulating balls will acquire a static charge, which can be positive or negative. By bringing a test charge near the insulating ball, it is possible to determine the sign of the charge.

In the case of conducting balls, the charge is determined by using a device called an electroscope. The electroscope can detect the presence of charge on the conducting ball by measuring the flow of charge through a metal leaf in response to the presence of the ball. By measuring the direction of flow of charge, it is possible to determine the sign of the charge on the ball.

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Answer:

Selenium dichloride

Explanation:

Selenium (Se) and Chlorine (Cl) are both elements capable of combining together to form a compound with the chemical formula; SeCl2. Since the chlorine atom is more electronegative than selenium atom, the chlorine pulls more electrons towards itself to form an IONIC bond.

The SeCl2 compound formed is called Selenium dichloride as two atoms of Chlorine are needed to combine with one atom of Selenium to form the compound.

The name of the molecular compound is selenium dichloride (SeCl2).  

• Due to sharing of electrons between selenium and chlorine, Selenium dichloride is considered as covalent compound.  

• Both the elements are non-metals, and thus, would give rise to covalent bond.  

• Selenium is the least electronegative element of the two, so it is written first.  

• After that the more electronegative element is written, and then addition of suffix is done, that is, -ide.  

• If atoms of an element is more than one, then prefixes are supplemented that is mono for 1 atom, di for two atoms, and tri for three atoms.  

Thus, the name of the molecular compound is selenium dichloride.

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Answer:

it is b

Explanation:

Answer:

P since without a host the parasite won't be able to survive they would start decreasing as well but if the hosts were no more then they would go extinct. But since it is just decreasing then it should be P

Answer:

We can use Coulomb's law to solve this problem:

F = k * q1 * q2 / r^2

where F is the force between the two charges, k is Coulomb's constant (k = 9 x 10^9 N m^2 / C^2), q1 and q2 are the magnitudes of the charges, and r is the distance between them.

We know the force F, the distance r, and the magnitude of one of the charges q1. We can rearrange the equation to solve for the magnitude of the other charge q2:

q2 = F * r^2 / (k * q1)

Substituting the values we have:

q2 = (250 N) * (0.15 m)^2 / (9 x 10^9 N m^2 / C^2 * 6.5 x 10^-5 C)

Simplifying:

q2 = 8.65 x 10^5 C

Therefore, the magnitude of the other charge is 8.65 x 10^5 C.

Explanation:

150 km North, 50 km West,

a) The magnitude of the net magnetic force that acts on the particle is 2.18 x 10-6 N.
b) The angle that the net force makes with respect to the x axis is 63.8°.

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts. A pictorial representation of the magnetic field which describes how a magnetic force is distributed within and around a magnetic material.

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Answer:

C

Explanation:

The correct answer should be the micrometer.

The micrometer is an instrument that is capable of measuring the component of an object to very high precision. It is used to obtain accurate measurements in engineering.

In the case of the copper wire, the diameter of 0.3 mm was an approximation and a more accurate measure of the diameter would be obtained by using the micrometer.

The correct option is C.