Answer:
Explanation:
Renewable energy such as solar energy, wind energy, geothermal energy and hydropower are inexhaustible and obtained from natural sources. This energy can be replenished. Whereas, the non-renewable energy sources such as coal and petroleum products are exhaustible energy. They cannot be replenished. It takes millions of years to form non-renewable energy. The non-renewable energy cause pollution but renewable energy is environment-friendly without being depleted. Therefore, renewable sources of energy better than non-renewable sources.
Four students are asked to find the mass of a mineral using a calibrated balance. The results were as follows: 16.009 g, 15.780 g, 16.110 g, and 15.990 g. The known mass of the mineral is 16.100g. Which student's result was the most accurate? The results were _____. 16.009 g 15.780 g 16.110 g 15.990 g
Answer:
16.110 g
Explanation:
A state government is trying to decide what type of energy its state should rely on for electricity in the future. Which of the following is a benefit associated with the use of coal power that the government should take into consideration?
A.Coal power plants release toxic chemicals into the air
B.Mining for coal hurts the environment
C.Coal power can be generated both day and night
D.Burning coal releases greenhouse gases
Answer: C. Coal power can be generated both day and night.
Explanation:
Coal is an important form of source of energy. It is a non-renewable source of energy. It is obtain by mining of the surface below the earth crust. Coal plays an important role in generation of electricity worldwide.
It acts as a raw material for the generation of electricity in both day and night. When the coal is turned into a gas. The gas turbine is hot enough to boil the water that can be used to make the steam. The steam spin another type of turbine so as to generate the electricity.
Two particles oscillate in simple harmonic motion along a common straight-line segment of length
a. each particle has a period of 1.5 s, but they differ in phase by pi/6 rad. (a) how far apart are they (in terms of
a.0.50 s after the lagging particle leaves one end of the path
Cassy shoots a large marble (Marble A, mass: 0.06 kg) at a smaller marble (Marble B, mass: 0.03 kg) that is sitting still. Marble A was initially moving at a velocity of 0.7 m/s, but after the collision it has a velocity of –0.2 m/s. What is the resulting velocity of marble B after the collision? Be sure to show your work for solving this problem along with the final answer.
Final answer:
The final velocity of marble B after the collision is determined by using the conservation of momentum, which yields a resulting velocity of 1.8 m/s.
Explanation:
To solve the problem, we use the principle of conservation of momentum because no external forces are acting on the system of the two marbles. The total momentum before the collision must equal the total momentum after the collision. The equation for this is:
m1 * v1_initial + m2 * v2_initial = m1 * v1_final + m2 * v2_final
where:
m1 = Mass of Marble A = 0.06 kg
m2 = Mass of Marble B = 0.03 kg
v1_initial = Initial velocity of Marble A = 0.7 m/s
v2_initial = Initial velocity of Marble B = 0 m/s (since it is at rest)
v1_final = Final velocity of Marble A after collision = -0.2 m/s
v2_final = Final velocity of Marble B after collision (this is what we are solving for)
Plug in the known values and solve for v2_final:
0.06 kg * 0.7 m/s + 0.03 kg * 0 m/s = 0.06 kg * (-0.2 m/s) + 0.03 kg * v2_final
0.042 kg∙m/s = -0.012 kg∙m/s + 0.03 kg * v2_final
Add 0.012 kg∙m/s to both sides:
0.054 kg∙m/s = 0.03 kg * v2_final
Divide both sides by 0.03 kg to get the final velocity of Marble B:
v2_final = 0.054 kg∙m/s / 0.03 kg = 1.8 m/s
Therefore, the resulting velocity of marble B after the collision is 1.8 m/s.
Why do you lurch forward in a bus that suddenly slows? why do you lurch backward when it picks up speed? what law applies here?
Final answer:
You lurch forward in a bus that suddenly slows due to Newton's First Law of Motion, or the law of inertia, which suggests an object in motion stays in motion unless acted on by an unbalanced force. When the bus accelerates, inertia causes you to feel pushed back as your body prefers to remain at rest. Understanding this law helps in recognizing the importance of safety measures like seatbelts.
Explanation:
Understanding Movement in a Bus: Newton's First Law of Motion
When a bus suddenly slows down, you lurch forward because of Newton's First Law of Motion, also known as the law of inertia. This law states that an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Since your body wants to keep moving at the same speed the bus was going before it slowed down, you lurch forward when the bus decelerates.
Similarly, when the bus speeds up, you might feel like you are being pushed back into your seat. This is again due to the law of inertia. Your body wants to remain at its state of rest (or moving at a constant speed if the bus was already moving), so when the bus accelerates, it creates a temporary imbalance, making you feel pushed back.
Using seatbelts or holding onto something stable inside the bus can counteract these effects by providing the necessary force to keep you in place, thereby preventing injury and ensuring safety.
Why Understanding Newton's First Law is Important
The applications of Newton's First Law are seen in everyday life, not just in theoretical physics. It explains a wide range of phenomena, from why it's crucial to wear a seatbelt to the importance of headrests in preventing whiplash injuries. Understanding these principles can help improve personal safety and awareness in moving vehicles.
Explain why the extrapolated temperature is used to determine the maximun temperature of the mixture rather than the highest recorded temperature
The extrapolated temperature is used to determine the maximum temperature of the mixture because it provides a more accurate estimate. The highest recorded temperature may not necessarily represent the maximum temperature due to outliers or external factors. Extrapolation allows us to estimate the maximum temperature based on the trend in the data.
Explanation:The extrapolated temperature is used to determine the maximum temperature of the mixture rather than the highest recorded temperature because it provides a more accurate estimate. Extrapolation involves extending a trend or pattern in data beyond the existing range, based on mathematical calculations. This allows us to estimate the maximum temperature that the mixture would reach if the trend continued.
On the other hand, the highest recorded temperature may not necessarily represent the maximum temperature the mixture can achieve. It could be an outlier or affected by external factors such as experimental errors or limitations of the measuring instrument. Therefore, relying solely on the highest recorded temperature may lead to inaccurate conclusions.
For example, let's say we have a mixture that is being heated and we measure its temperature at regular intervals. The recorded temperatures show a steady increase, but eventually, the rate of increase slows down. By extrapolating the trend, we can estimate the maximum temperature the mixture would reach if the heating process continued.
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Extrapolated temperature is used to determine the maximum temperature of a mixture because it accurately takes into account the broad distribution of molecular speeds that emerges when masses of different temperatures are mixed. It offers a more accurate representation of the maximum temperature.
Explanation:The reason the extrapolated temperature is used to determine the maximum temperature of the mixture, rather than the highest recorded temperature, is largely because of the way temperature distributions work. For instance, when two masses of different temperatures are mixed, the mixture is less orderly and less structured. This results in a broad distribution of molecular speeds, the average of which yields an intermediate temperature that is not necessarily the highest possible temperature. This concept can be best illustrated with blackbody curves showing the distributions of wavelengths at different temperatures. The
extrapolated temperature
takes this broad distribution into account, hence, offering a more accurate representation of the maximum temperature. With this in mind, it's clear that the extrapolated temperature provides the most accurate measurement when determining the highest temperature of a mixture.
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If there is no crosswalk or limit line near an intersection, you should stop __________.
a. one car length before the corner
b. 20 ft before the corner
c. at the corner
Answer:
The best answer to the question: If there is no crosswalk or limit line near an intersection, you should stop _____, would be, C: at the corner.
Explanation:
This regulation is part of what is taught to drivers before they get their drivers license. In essence, the regulation says that if you come to an intersection, and there is a limit line, or a crosswalk, of course you know you must stop before moving on. The problem comes when neither a crosswalk, nor a limit lines is marked near the intersection. To solve this, the regulation states that even if there are no such limiting lines, or marks, the driver must still come to a stop at the corner, before entering the intersection. This is why the anwer is C.
You push forward on a car with a force of 150 N, but the car does not move. What is the net force on the car?
A plucked guitar string produces a sound wave with a wavelength of 0.15 m and a velocity of 10.5 m/s, what is the frequency of the wave?
Using the wave equation, the frequency of the sound wave produced by the guitar string can be calculated by dividing the velocity (10.5 m/s) by the wavelength (0.15 m), resulting in a frequency of 70 Hz.
The student is asking about the frequency of a sound wave produced by a plucked guitar string. To calculate this, we can use the basic wave equation v = f λ, where v is the velocity of the wave, f is the frequency, and λ is the wavelength. Given the wavelengths of 0.15 m and the velocity of 10.5 m/s, we can rearrange the formula to solve for the frequency (f):
f = v / λ
f = 10.5 m/s / 0.15 m
By calculating this, we find that the frequency of the wave is 70 Hz.
Are all neon lights made up of neon gases
In terms of energy, think about what happens when you eat a hot meal. Describe all the different forms of energy that you experience. For example, if you are eating under a lamp, its electromagnetic energy helps you see the food. Explain the source of each form of energy.
What makes science different from other fields of knowledge like art or philosophy?
What will most likely occur if sulfur forms an ionic bond with another element?
The velocity of waves having wavelength 0.643 m and frequency 3.25 e 10 hz is
The relationship between velocity (v), wavelength (w) and frequency (f) is expressed as:
v = w f
Plugging in the given values into the equation:
v = 0.643 m (3.25 e 10 Hz)
Where Hz = 1 / s , therefore:
v = 0.643 m (3.25 e 10 / s)
v = 2.09 e 10 m / s
Taking into account the definition of wavelength, frecuency and propagation speed, the velocity of waves having wavelength 0.643 m and frequency 3.25 e 10 Hz is 2.09 e 10 m/s.
What is wavelength, frecuency and propagation speedWavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
On the other side, frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Finally, the propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave disturbance propagates along its displacement.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation: v = f×λ
What is the velocity of waves in this caseIn this case, you know:
f=3.25 e 10 Hzλ=0.643 mReplacing in the definition of propagation speed:
v= 3.25 e 10 Hz× 0.643 m
Solving:
v= 2.09 e 10 m/s
Finally, the velocity of waves having wavelength 0.643 m and frequency 3.25 e 10 Hz is 2.09 e 10 m/s.
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Ptolemy's model was __________, with the earth fixed in the center of the universe.
Which statement is true about magnetic poles?
North and south poles repel each other.
North and south poles attract each other.
Two south poles will attract each other.
Two north poles will attract each other.
North and south poles attract each other.
Explanation;A magnet is a material that has an ability to produce magnetic fields.A magnet has two poles, north pole and a south pole. The north pole is the side which points north when a magnet is freely suspended on air, while south pole is the pole that points south. Based on the basic law of magnetism, like poles repel while unlike poles attract. Therefore, north pole attracts with a south pole, but repels another north pole. Two north poles repel while two south poles also repel.A magnetic field applies forces on:
a.static charges
b.moving charges
c.water flow
Answer:
its b on oddessey ware
Explanation:
Water current has the greatest effect on which type of boat?
Water currents have the most significant effect on smaller and lighter boats such as kayaks, canoes, and dinghies as these boats have less weight and hence lower inertia, making them less capable of resisting the force of the water current. However, all types of boats, including large vessels, are affected by water currents.
Explanation:The water current can have a great impact on different types of boats but it especially affects smaller and lighter boats like kayaks, canoes, or dinghies, which are more susceptible to being moved by currents. This is due to these boats having less weight and hence lower inertia/displacement, which means they are less capable of resisting the force of the current.
This does not mean that larger boats are not affected by water currents. Even large vessels such as cargo ships are impacted by currents. They must account for the current when navigating, and miscalculations can lead to off-course journeys and even accidents. However, changes in their courses brought about by currents are less abrupt compared to smaller boats.
The effect of water current on a boat also depends on other factors like the skill and experience of the boat operator, the boat's design, and the conditions of the water body.
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A boat moves 60 kilometers east from point A to point B. There, it reverses direction and travels another 45 kilometers toward point A. What are the total distance and total displacement of the boat?
The answer will be c the total distance is 105
Which of these statements is true? controlled data produces valid experiments. controlled experiments produce valid data. valid experiments produce controlled data?
Each of the choices may be considered right depending on the use of context or on how terms are defined, but the one that is most correct is:
"Controlled experiments produce valid data"
Controlled experiments are experiments in which factors which are not the interest of the study or which are not being studied are controlled or accounted for in the design, so that resulting data are less likely to be caused by some anomaly or by some variable other than those being studied. In usual research scenarios it is not the data itself that is acted upon in the experiment - it is the experiment itself, the factors and the physical processes that will eventually yield data.
The truthful statement is 'controlled experiments produce valid data'. This is because in controlled experiments, only a single variable is adjusted, allowing scientists to directly observe the effects, producing valid, reliable data.
Explanation:Out of these options, the statement: 'controlled experiments produce valid data' is accurate. In a controlled experiment, researchers only change one variable at a time while keeping all other variables constant, which helps in isolating the effects of the one variable that is manipulated and facilitates the collection of valid data. Proper experimental design involves both control and experimental groups, with the only difference being whether participants are exposed to the experimental manipulation. With correct procedures and considered analysis, significant and valid data can be produced.
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Ep-35 if your inboard/outboard boat runs aground, what action should you take in addition to shifting the weight away from the point of impact
If your inboard or outboard boat runs aground, after shifting the weight away from the point of impact, you should stop the engine and lift the outdrive.
What is a gasoline engine?A gasoline engine can be defined as a mechanical system that is primarily designed and developed to only make use of hydrocarbons (organic compounds) such as fuels, in order to enable a vehicle or boat to move from one point to another on a water body.
Generally, an outboard gasoline engine is installed on the outside of a vehicle or a boat while an inboard gasoline engine is typically installed on its inside.
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While standing near a bus stop, a student hears a distant horn beeping. The frequency emitted by the horn is 440 Hz. The bus is traveling at 20.0 m/s, and the speed of sound is 330 m/s. What frequency will the student hear at each point in the bus's motion?
A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding
B. 415 Hz while approaching, 440 Hz through the crossing, 468 Hz while receding
C. 440 Hz while approaching, 415 Hz through the crossing, 400 Hz while receding
D. 505 Hz while approaching, 440 Hz through the crossing, 438 Hz while receding
Answer:
A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding
Explanation:
When bus is approaching the stand where boy is standing then the frequency is given as
now we know that
[tex]f_0 = 440 Hz[/tex]
[tex]v = 330 m/s[/tex]
[tex]v_b = 20 m/s[/tex]
frequency is given by
[tex]f_1 = f_0 \frac{v}{v - v_b}[/tex]
now plug in the data in the equation
[tex]f_1 = 440 \times \frac{330}{330 - 20}[/tex]
[tex]f_1 = 468 Hz[/tex]
Now when bus is moving away from the bus stop then frequency is given as
[tex]f_2 = f_0 \frac{v}{v + v_b}[/tex]
[tex]f_2 = 440 \times \frac{330}{330 + 20}[/tex]
[tex]f_2 = 415 Hz[/tex]
so here correct answer would be
A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding
A beaker contain 200mL of water
What is its volume in cm3 and m3
Make the curvature radius 0.6 m, the refractive index 1.5, and the diameter 0.6 m. place the lamp so that the source of light is 120 cm from the middle of the lens (use the ruler). the focal length of the lens is ____________, and the focal plane is ___________ from the lens.
To find the focal length of the lens, the Lens Maker's Equation can be used. With the given information, we can calculate the focal length to be approximately 1.2 m. The focal plane is also located at a distance equal to the focal length of the lens.
Explanation:To calculate the focal length of a lens, we can use the Lens Maker's Equation. The equation is given by:
1/f = (n - 1) * (1/R₁ - 1/R₂)
where f is the focal length, n is the refractive index, R₁ is the radius of curvature of the first surface, and R₂ is the radius of curvature of the second surface. In this case, the lens is plano-convex, which means one surface is flat and the other is curved. Let's assume the flat surface is the first surface and has a radius of curvature of infinity. The second surface has a radius of curvature of -0.6 m. With a refractive index of 1.5, we can plug in these values into the equation to find the focal length:
1/f = (1.5 - 1) * (1/infinity - 1/-0.6)
Since the radius of curvature of the first surface is infinity, the first term becomes zero. Simplifying the equation further, we get:
1/f = (1.5 - 1) * (0 + 1.67)
1/f = 0.5 * 1.67
1/f = 0.835
Solving for f, we find:
f = 1/0.835
f ≈ 1.2 m
The focal plane is located at a distance equal to the focal length of the lens. Therefore, the focal plane is approximately 1.2 m from the lens.
In a collision, the __________ collision is when an unsecured driver strikes the inside of the vehicle.
Answer:
In a collision, the SECOND collision is when an unsecured driver strikes the inside of the vehicle.
Explanation:
When driver in the car is unsecured then it means that the driver is not having his safety seat belt.
Now when collision occurs between the car and some other object then due to the property of inertia of driver it has tendency to move in the direction of his motion.
So the driver will continue his motion and collide with other parts of the car and due to this he may got injured.
So in any car collision there are two types of collision
first is the collision of car with other objects
second collision is between car and the driver inside the car
A mixture can be classified as a solution, suspension, or colloid based on the
A. number of particles it contains.
B. size of its largest particles.
C. color of its particles.
D. size of its smallest particles.
What term refers to the region of an atom where an electron is most likely to be found?
Answer:
Orbital
Explanation:
Quantum theory established that electrons doesn't follow a perfectly determined pathway in their movement around the nucleus. Rather, this theory establishes a region, called orbitals, where an electron is likely to be found in an atom.
When merging onto an expressway from an acceleration lane, you should
When merging onto an expressway from an acceleration lane, you should gradually accelerate to match the speed of traffic and merge safely. Avoid excessive speed, travel during less congested times, and decelerate gradually to avoid abrupt stops.
When merging onto an expressway from an acceleration lane, you should achieve a speed close to that of the traffic on the expressway. It's important to use the acceleration lane to increase your speed to a safe level that allows you to merge into traffic without causing other drivers to brake abruptly. To ensure safety, remember to avoid high speed driving beyond the flow of traffic, travel when congestion is light to reduce the need to merge at very high speeds, and avoid unnecessary braking by smoothly accelerating up to highway speeds and planning for potential traffic conditions that allow for gradual deceleration before stops.
Observing the other drivers on the road will also help. Drivers going in the same direction as you appear to move at lower speeds — this is relative motion. However, ensure you're paying attention to your speedometer to maintain an appropriate speed. Oncoming traffic may seem to be moving much faster due to their relative speed in comparison to your vehicle, but do not let this perception cause you to speed up excessively when merging.
Which has a greater momentum: a heavy truck at rest or a moving skateboard?
You are retrieving your boat from the water. as a courtesy to others, when should you pull your boat into a launch lane?
Explanation:
Traffic jams on boat ramps can be avoided if everyone follows and practices some common courtesy at the ramp. While retrieving the boat from the water surface, it is a common courtesy to place the boat into the launch area only after the towing vehicle has arrived at the ramp. Drop off the driver and then generously wait wait offshore for your turn. Try to clear up the ramp until the trailer arrives at the ramp. This is a most common practice that every body should follow as a common courtesy to others.