Which sentence describes the energy changes that occur when a chemical
reaction happens?
o a. energy is absorbed to break bonds in the reactants and released
when the bonds in the products form.
b. energy is released to break bonds in the reactants and absorbed
when the bonds in the products form.
c. energy is released when bonds in the reactants break and when
bonds in the products form.
d. energy is absorbed to break bonds in the reactants and to form
bonds in the products.

Thus the closest object that the woman should be able to see while looking through the upper part of the bifocal lens would be the object that lies between 25cm of the lens.

Bifocal spectacles are specs which are created of both convex and concave lens. The upper part is made up of the concave lens while the lower part consists of convex lens.

When looking through the upper part of the bifocal lens the objects at a little distance become clearer as the upper part of bifocal lens consists of diverging lens that is used to correct distant or vision at some distance.

There are two types of lens the converging or convex lens and the diverging lens or concave lens.

Convex lens is called the converging lens as a two parallel rays of light when passing through a convex lens get bent towards each other and converge at some point.

Concave lens is called the converging lens as two parallel rays on passing through the concave lens get diverged from each other.

The clearest image that is formed by a concave lens is when the object lies between the focal point and the lens, where the image is formed at the focal point on the image side of the lens.

Thus the closest object that she would be able to see is the object that she would be able to see clearly would be the object that lies between 25cm of the lens.

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Answer:

Explanation:

I need the answer me too

Answer:

p and q are 4.0 m apart

moments around q

4 p = (10 * 5) + (4 * 2) - (8 * 1)

p = 12.5

Rp = 12.5 g

moments around p

4 q = (8 * 5) * (4 * 2) - (10 * 1)

q = 9.5

Rq = 9.5 g

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Explanation:

Answer:

Venus

Explanation:

The angular momentum of a system is constant when there is no net external torque acting on the system. This is known as the conservation of angular momentum.

Angular momentum is a measure of the amount of rotational motion of an object or a system of objects. It is defined as the product of the moment of inertia and the angular velocity of the object or system.

When there is no net external torque acting on a system, the total angular momentum of the system remains constant. This means that if one part of the system gains angular momentum, another part must lose an equal amount of angular momentum to maintain the total angular momentum of the system.

The conservation of angular momentum has many important applications in physics and engineering. For example, it explains why a spinning ice skater speeds up when she pulls her arms in towards her body and why a gyroscope maintains its orientation in space even when it is subjected to external forces.

Therefore, the angular momentum of a system is constant when there is no net external torque acting on the system.

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Available options are:

A. –4500 N

B. –2500 N

C. 2500 N

D. 4500 N

Answer:

-4500 N

Explanation:

Given that we have F₁ = 3000N? (force of the barge)

the force of the tugboat is F '

To pull the barge, the force of the tugboat must be greater than or equal to the force of the barge.

Hence, according to Newton's third law which states that for every action or force in nature, there is an opposite reaction.

Therefore considering the available option the correct answer is "- 4500N, " this is because it is greater than the force of the barge and it's in opposition to the force exerted.

Answer:

The answer is -4500 N

Explanation:

The first step is to convert the parallax angle of the star to distance. We can use the formula: parallax angle in arc seconds = (distance to star in parsecs)^-1 We can rearrange this equation to isolate distance: d = (parallax angle)^-1 Therefore, the distance to the star in parsecs is:

d = (0.0190 arcseconds)^-1 = 52.6 parsecs Next, we need to find the actual distance in meters. One parsec is equivalent to 3.09 × 10^16 meters. Therefore, the distance to the star in meters is: distance = (52.6 parsecs)(3.09 × 10^16 meters/parsec) = 1.63 × 10^18 meters Now, we can use the formula for time: d = vt Solving for time: t = d/v We are told to travel at half the speed of light, which is v = 0.5c, where c is the speed of light.

Therefore, the time to travel to the star is: t = (1.63 × 10^18 meters)/(0.5c) Using the speed of light, c = 3.00 × 10^8 m/s, we get: t = (1.63 × 10^18 meters)/(0.5 × 3.00 × 10^8 m/s)t ≈ 10.9 years Therefore, it would take about 10.9 years to travel to the star if traveling at half the speed of light.

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Which example shows Pascal's principle a hydraulic jack .

What is a hydraulic jack?

A hydraulic jack is a device used to lift heavy objects or materials by using a hydraulic cylinder to generate a large amount of force. It works by using a pump to transfer fluid from a reservoir into a cylinder, which in turn applies pressure to a piston.

When the pressure is high enough, the piston will push against the object it is lifting, allowing the user to raise or lower the object. Hydraulic jacks are often used for automotive repair, construction, and other heavy-lifting applications.

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C. the energy levels of the electrons within the gas cloud.

C. the energy levels of the electrons within the gas cloud.

The exact wavelength of the spectral lines of a gas cloud is determined by the energy levels of the electrons within the gas cloud. When electrons in an atom or molecule transition between different energy levels, they emit or absorb photons with specific wavelengths corresponding to the energy difference between those levels. These emitted or absorbed photons form the spectral lines observed in the spectrum of the gas cloud.

The temperature of the gas cloud (option A) can affect the broadening of the spectral lines due to thermal motion, but it does not determine the exact wavelengths of the lines.

The relative motion of the molecules in the gas cloud (option B) can cause Doppler shifts, which alter the observed wavelengths, but again, it does not determine the intrinsic wavelength of the spectral lines. The number of atoms within the gas cloud (option D) does not directly influence the wavelengths of the spectral lines; it can affect the intensity or brightness of the lines, but not their specific wavelengths.

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Answer:

to talk??? i will talk with you

Different stages of life require different nutritional needs. Teenagers grow physically so they need more calories and nutrients. Therefore, option (B) is correct.

Nutritional needs changes will continue throughout all life stages with the requirements for protein, calories, vitamins, and minerals adjusting as we grow older.

The physical needs of the human body change over time, and dietary needs at various life stages will change as a result of psychological, economic, and social aspects. The change in nutritional requirements for each life stage such as infants, children, teens, adults, and the elderly.

Due to the growth period, teenagers need a balanced diet packed full of nutrients including calcium, iron, and protein which will ensure they are getting these essential nutrients. Vegetables are good for older people as they reduce health risks.

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Answer:

lighter ones will go faster

Explanation:

assuming you throw both bolwing ball with 10N of force. one is 3kg and the other is 5kg.

by using the equation: F = ma

a = F/m

a = 10/5 = 2m/s^2

a = 10/3 = 3.33333 m/s^2

The effect that this will have on the amplitude of your oscillation.is b.) The amplitude of oscillation will decrease.

The amplitude of an oscillating system is the magnitude of change in the oscillating variable with each oscillation. Sound waves in air, for example, are oscillations in atmospheric pressure, and their amplitudes are proportional to the pressure change during one oscillation.

When a wave travels through a medium, it loses energy as it moves. As the distance between the wave and its source grows, it spreads out over a larger and larger area. As the wave spreads through the medium, it loses energy and its amplitude decreases.

In this case, at the point of equilibrium, the cart and the skater will have maximum kinetic energy. By dropping the same bag, the energy is reduced. The amplitude of an oscillating pendulum decreases with time because of friction due to air

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On a whim, you are trying to stand in a cart attached to a strong spring. The spring is compressed and then released, and you oscillate back and forth, trying to maintain your balance. There is a sand bag in the cart.

At the instant you pass through the equilibrium (x=0) location of the spring, you drop the sandbag onto the ground, out of the cart.

Question: If you drop the sand bag out of the cart right at the equibrium location, what effect will that have on the amplitude of your oscillation? (choose correct choice):

a.) The amplitude of oscillation will increase.

b.) The amplitude of oscillation will decrease.

c.) There will be no effect on the amplitude.

Answer:

Look below.

Explanation:

All the symptoms provided points to the common problem of dehydration. Especially a physically active person because they are constantly sweating which leads to the loss of bodily fluids and dehydration.

Answer:    

   1. The death penalty should be abolished.

   2. Human cloning should be legalized.

   3. All drugs should be legalized.

   4. Animal testing should be banned.

   5. Juveniles should be tried and treated as adults.

   6. Climate change is the greatest threat facing humanity today.

   7.  Is There Life After Death?

   8. Is Evolution or Creationism the Truth?

Explanation:

Answer:

f = 459.8 Hz

Explanation:

When a trumpet is playing it is an open tube at both ends, therefore there is a belly in each one, the resonance occurs to

           λ = 2L             1st harmonic

           λ = 2L /2        2nd harmonic

           λ = 2L /3       3rd harmonic

the speed of the wave is

           v = λ f

           λ = v / f

we substitute in the third harmonic

            \(\frac{v}{f} = \frac{2L}{3}\)            (1)

            L = \(\frac{3}{2} \ \frac{v}{f}\)

            L = \(\frac{3}{2} \ \frac{343}{ 510}\)

            L = 1.009 m

indicates that to  add ΔL = 0.110 m, so the total length is

            L_total = L + ΔL

            L _total = 1.009 + 0.110

            L _total = 1,119 m

we use equation 1

            f =  \(\frac{3}{2} \ \frac{v}{L_{total}}\)

            f = \(\frac{3}{2} \ \frac{343}{1.119}\)

            f = 459.8 Hz

A preserved quantity is momentum. Snowball and skater's initial system momentum is 0 because everything is motionless. A snowball must have zero motion overall after being thrown. To make the skater's momentum equal zero, she skates backward (in the opposite direction of the snowball).

The conservation of momentum is a general law of physics which states that the total momentum of a system remains constant and that the quantity called momentum which characterizes motion never changes in an isolated collection of objects. Momentum is the force necessary to bring an item to a complete stop in a unit of time, and is determined by multiplying an object's mass by its velocity.

The total momentum is equal to the sum of the individual momenta for any array of multiple objects. The momenta of objects moving in opposite directions might cancel out to produce an overall sum of zero, due to the oddity that momentum is a vector that includes both the direction and the amplitude of motion.

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Given an average acceleration of 3.51 m/s² for a duration of 2.01 seconds and a final velocity of 15.9 m/s, the car's initial velocity can be calculated as 8.868 m/s.

The equation of motion that relates acceleration (a), time (t), initial velocity (u), and final velocity (v) is v = u + at. Rearranging this equation, we have u = (v - at).

In this scenario, the car's average acceleration is given as 3.51 m/s² and the time is 2.01 seconds. The final velocity of the car is 15.9 m/s. Plugging these values into the equation, we can calculate the initial velocity of the car.

Substituting the given values, we have 15.9 m/s = u + (3.51 m/s² * 2.01 s). By rearranging the equation and isolating the initial velocity, we get u = 15.9 m/s - (3.51 m/s² * 2.01 s). Performing the calculations, we find that u = 8.868 m/s.

Therefore, the car's initial velocity is determined to be 8.868 m/s.

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Answer:

"Coal has many important uses worldwide. The most significant uses of coal are in electricity generation, steel production, cement manufacturing and as a liquid fuel. Different types of coal have different uses. Steam coal - also known as thermal coal - is mainly used in power generation."

Explanation:

Answer:

Coal can be used for many things. Mostly though, to help steel production. For example, electricity generation. They can also be used for cemet as a liquid fuel. There are many types of coals with different purposes.

At 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

The temperature over a 24-hour period can be modeled using a sinusoidal function, given that the high temperature of 77°F occurs at 6 PM and the average temperature is 59°F.

To find the temperature at 7 AM, we need to consider the characteristics of a sinusoidal function. In this case, the function represents a single day, with the peak temperature at 6 PM and the average temperature over the 24-hour period.

Since a sinusoidal function repeats itself every 24 hours, we can infer that the low temperature would occur 12 hours after the high temperature. Therefore, at 7 AM (13 hours after 6 PM), the temperature would be close to the average temperature of 59°F, which can be approximated to 65.9°F.

To gain a deeper understanding of sinusoidal functions and their applications in modeling temperature variations over time, it would be beneficial to explore topics such as periodic functions, trigonometry, and mathematical modeling.

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We've put together a step-by-step explanation of how people hear—from the moment sound waves arrive to the outer ear, then travel through the middle and inner ear and transform into meaningful signals sent on to the brain. Our brain uses these signals to organize and communicate with the external world.

Answer:

R = 240 Ω

Explanation:

The resistance created by the light bulb can be calculated by using Ohm's Law:

\(V = IR\\\\R =\frac{V}{I}\)

where,

R = Resistance created by the light bulb = ?

V = Voltage across the bulb = 120 volts

I = current passing through the light bulb = 0.5 A

Therefore,

\(R = \frac{120\ volts}{0.5\ A}\)

R = 240 Ω

The speed of the Earth's rotation affects the length of a day, which in turn influences various aspects of life, including the distribution of sunlight, temperature patterns, and the overall dynamics of ecosystems.

To calculate the speed of the Earth's rotation 155 million years ago, we need to consider the rate at which the Earth's rotation is slowing down. According to the given information, the Earth slows down 1/30000 of a minute every 100 years.

Let's first calculate the change in the Earth's rotation speed over 155 million years:

Change in rotation speed = (1/30000 minute/100 years) * (155 million years)

Now we can calculate the speed of the Earth's rotation at that time:

Current rotation speed - Change in rotation speed

Given that the current rotation speed is 1670 kilometers/hour, we can substitute the values and calculate:

Rotation speed at that time = 1670 km/hour - (Change in rotation speed)

Once we have determined the rotation speed at that time, we can assess its potential impact on the movement of dinosaurs or mankind.

A change in the rotation speed could have implications for the behavior, adaptation, and survival of living organisms, including dinosaurs and early humans.

However, it is important to note that the exact magnitude and direct consequences of changes in rotation speed on specific species and their movements would require a more detailed analysis and consideration of various ecological factors.

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In IPv6, each extension header is identified by a particular "Next Header" value.What are IPv6 and Extension Headers?IPv6 stands for Internet Protocol version 6, which is an improved version of IPv4.

IPv6 addresses are 128 bits long, compared to IPv4 addresses which are 32 bits long. IPv6 uses a modified packet format and some other features, including extension headers. Extension headers are used by IPv6 to provide additional features and information, such as fragmentation, security, and routing information.

What are the Next Header and Header Fields? The Next Header field is one of the header fields used in IPv6 to indicate the type of the next header that follows the current header. It has an 8-bit length and is located just after the source address field. The next header field's value determines the type of the extension header that follows. The header fields are data fields that carry information about the IPv6 packet. It includes the source address, the destination address, the payload, and the various extension headers (if any).

The Next Header field in IPv6 identifies each extension header by a particular value. It is located after the source address field and has an 8-bit length.
IPv6 has a Next Header field that identifies each extension header by a specific value. Extension headers provide additional features and information to IPv6 packets, such as fragmentation, security, and routing information.

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The balance point of the bar from the 100 g mass is 12 cm.

Apply principle of moment as follows;

Let the balance point from 100 g mass = x

Clockwise moment = anti clockwise moment

100x = 150(20 - x)

100x = 3,000 - 150x

250x = 3000

x = 3000/250

x = 12 cm

Thus, the balance point of the bar from the 100 g mass is 12 cm.

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Each polarizing filter will only allow light waves that are oscillating in a plane perpendicular to its axis to pass through, while blocking those oscillating parallel to its axis.

Since the axis of each filter is rotated by 15 degrees with respect to the previous filter, the intensity of the light passing through will decrease by a factor of cos^2(15) for each filter, where cos(15) is the cosine of 15 degrees. Therefore, the intensity of the light emerging from the last filter will be I_0 * cos^2(15) raised to the power of 7, as there are 7 filters in the stack. This can be calculated as approximately 0.048 I_0 or about 4.8% of the original intensity I_0.

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Answer:

1. The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time

2. 36÷4= 9

(formula) Speed = distance ÷ time

3. Meter (M) centimeter (cm) kilometers (km)

4. Seconds , Hour, Minute

5. 65÷13=5 (object A)

125÷ 25= 5 (object B)

their both Equal of the amount of speed, so they are travelling at the same speed

Hope I helped