An arrow is shot vertically upward from a platform 33ft high at a rate of 214ft/sec. when will the arrow hit the ground? use the formula: h=−16t2+v0t+h0. (round your answer to the nearest tenth.)
The wheel and axe is a modified incline plane
A.True
B.False
If the sun were replaced by a 1-solar-mass black hole, what would be the gravitational pull of the black-hole "sun" on earth?
The gravitational pull that a 1-solar-mass black hole would exert on Earth is the same as the sun. This is because gravitational pull is determined by mass and distance. However, life on Earth would be greatly impacted due to the lack of sunlight and heat.
Explanation:If the sun was replaced by a 1-solar-mass black hole, the gravitational pull it exerts on Earth would be the same as that of the sun. This is due to the fact that gravitational pull is determined by mass and distance. Considering the mass would be the same and the distance between Earth and the black hole would remain constant, the gravitational pull remains unaffected.
However, without the sun's light and heat, life as we know it on Earth would not be sustainable. It's also important to note that while the gravitational pull remains the same, various other aspects of having a black hole instead of a sun would drastically impact our planet.
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Explain why sound travels faster through iron than through air
What is the frequency corresponding to a period of 8.01 s?
The frequency corresponding to a period of 8.01 seconds is calculated using the formula f = 1/T, resulting in a frequency of approximately 0.125 Hz.
Explanation:The question relates to the concept of period and frequency in wave motion which is a topic in Physics. To find the frequency corresponding to a period of 8.01 s, you use the formula f = 1/T, where f is the frequency and T is the period. Applying this formula:
f = 1/T = 1/8.01 s ≈ 0.125 Hz
Therefore, the frequency corresponding to a period of 8.01 seconds is approximately 0.125 Hertz (Hz).
Which of the following is an inelastic collision?
What is the electric field at a position that is 1.6m East of a point charge of 7.2 x 10^-6C?
Final answer:
The electric field at a position 1.6m East of a point charge of 7.2 x 10^-6C can be calculated using Coulomb's Law. The electric field is 25.2 N/C.
Explanation:
The electric field at a position 1.6m East of a point charge of 7.2 x 10^-6C can be calculated using Coulomb's Law. Coulomb's Law states that the electric field at a point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance.
The formula to calculate the electric field is:
E = k * q / r^2
where E is the electric field, k is the electrostatic constant, q is the charge, and r is the distance.
Plugging in the values:
E = (9 x 10^9 Nm^2/C^2) * (7.2 x 10^-6C) / (1.6m)^2
E = 25.2 N/C
Therefore, the electric field at a position 1.6m East of the point charge is 25.2 N/C.
Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table. Which lists the springs based on the amount of elastic potential energy, from greatest to least? X, Y, W, Z X, W, Y, Z Z, W, Y, X Z, Y, W, X
Answer:B
Explanation:
XWYZ
A transformer has 20 turns in its primary coil and 60 turns in its secondary coil. The input voltage for the transformer is 25 volts. What is the output voltage?
The graph shows the solubility of different compounds at different temperatures. Solubility refers to how much of something will dissolve in the given amount of water at a particular temperature. ________ shows the greatest change in solubility over the temperature range shown. A) KBr B) KNO3 C) NaCl D) NaClO3
Answer:
b
Explanation:
From the graph, it is clear that potassium nitrate, KNO₃ undergo great change in solubility over the temperature range.
What is solubility?
Solubility of a substance is the fraction of its concentration which is dissolved in a solvent at a specified temperature. Solubility of a substance is dependent on the nature of both solute and solvent.
The factors which determine the solubility of a solute are its bond types, molecular weight, temperature and pressure. As the temperature increases, the intermolecular force attraction between solute molecules decreases leading to solvent- solute interaction results in greater solubility.
From the graph it is clear that solubility of KNO₃ changes rapidly with temperature. Whereas , other compounds dose not show this steep curve with increase in temperature. Thus option B is correct.
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if 500 watts hit the surface of a solar panel every second and it generates 150 watts every second, how efficient is it?
The efficiency of the solar panel is 30%. This is determined by dividing the power generated by the panel (150 watts) by the power that hits the surface of the panel (500 watts).
Explanation:The efficiency of a solar panel can be calculated by dividing the output power by the input power. Here, the solar panel is receiving an input of 500 watts every second and generates 150 watts every second. Therefore, the efficiency is calculated as 150W / 500W = 0.3, or 30%. So, the solar panel is 30% efficient.
This efficiency is actually quite decent for a typical solar panel as most panels operate at around 15-20% efficiency. Factors impacting the efficiency include the amount and angle of sunlight, ambient temperature, and the type and configuration of the solar cells within the panel.
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Explain where most of the mass of an atom is located. Also, explain why some particles that make up the atom do not contribute much to its mass.
What are the short eruptions of intense high-energy radiation from the sun's surface called? Corona Prominences Solar flares Sunspots
The answer is Solor flare, this is because this is a sudden eruption of energy that is magnetic on or even near the surface of the star, the sun.
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Which organelles is used to transport materials through the cell
What is the focal length of a lens?
Explain how the "natural frequency" of objects must be considered/analyzed in places like concert halls and airplanes.
Sasha uses a basketball and a tennis ball to represent two astronomical bodies based on their sizes. Which of the following representations is the most correct based on what Sasha has? The basketball represents Earth and the tennis ball represents the solar system. The basketball represents the moon and the tennis ball represents the solar system. The basketball represents the solar system and the tennis ball represents Earth. The basketball represents the solar system and the tennis ball represents the Milky Way.
Answer:
C
Explanation:
im doing the test rn but i think this is right correct me if im wrong also have a good day or night
Explain why a cow that touches an electric fence experiences a mild shock
Final answer:
A cow experiences a mild shock from an electric fence because its body conducts electricity, completing a circuit to the ground, which is designed to be unpleasant but not harmful. Modern electric fences use pulsed currents to allow detachment, with safety standards keeping shocks below the harmful threshold.
Explanation:
When a cow touches an electric fence, it experiences a mild shock due to the principles of electricity and current flow in living organisms. Our bodies, similar to the cow's, are good conductors because of the high water content. This conductivity allows electric currents to flow through us, following the path of least resistance to reach the ground, often referred to as 'earthing'. Electric fences are designed to give a shock that is unpleasant but not harmful, utilizing a small current that can cause a sensation but is usually not enough to damage tissue.
Modern electric fences are now pulsed on and off to allow someone who touches them to pull away. This design is vital for safety, preventing prolonged exposure that could lead to muscular contractions strong enough to prevent letting go of the fence. Shocks from electric fences are typically below 5 mA (milliamps), which is the maximum allowed shock according to many safety standards. This threshold ensures the shock is felt but remains within a range considered to be harmless.
Additionally, the earth acts as a natural electron sink, allowing currents to dissipate safely when an individual or animal completes the circuit by touching the fence while grounded. However, insulating materials such as rubber shoes can break this path, preventing the shock, which is why electrical safety protocols often include insulating gear to prevent the flow of electrical currents through the body.
A light bulb burns out is a chemical or physical change ?
Which of these is NOT large and gaseous?
A) Jupiter
B) Mercury
C) Saturn
D) Uranus
A train travels 120 km In 2 hours and 30 minutes what’s its average speed
Do non metals have luster
A sheet of aluminum (al) foil has a total area of 1.000 ft2 and a mass of 3.716 g. what is the thickness of the foil in millimeters (density of al = 2.699 g/cm3)?
The thickness of foil having total area of 1ft² and mass of 3.716g is 0.451 millimeters.
Given, that the aluminum foil has a total area of 1.000 ft^2 and a mass of 3.636 g.
To find the thickness of the foil, calculate its volume.
The volume of the foil can be determined by multiplying its area by its thickness. Since the area is given in square feet, we need to convert it to square centimeters.
To convert the area from square feet to square centimeters, we use the conversion factor:
1 ft = 30.48 cm.
So, the area of the foil is 30.48 cm².
Let's assume the thickness of the foil is 'd' centimeters. The volume of the foil can be expressed as 30.48 cm² * d cm³.
Using the density formula, we have: density = mass / volume. Rearranging the formula, we get: volume = mass / density.
Plugging in the values,
Volume = [tex]3.716 g / 2.699 g/cm^3[/tex].
Volume = 1.376cm³
Equating the volume,
(30.48 cm)^2 * d = 1.376 cm^3.
Solving for 'd', we divide both sides of the equation by (30.48 cm)^2. This gives us:
[tex]d = 1.376 cm^3 / (30.48 cm)^2[/tex]
d= 0.0451 cm.
Finally, to express the thickness in millimeters, multiply 'd' by 10.
This gives the thickness of the foil as approximately 0.451 mm.
Therefore, the thickness of the aluminum foil is approximately 0.451 mm.
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To determine the thickness of aluminum foil with provided mass and area, the volume is first calculated by dividing the mass by the density of aluminum. Then, the area is converted from square feet to square centimeters, and finally, the volume is divided by the converted area to get the thickness in millimeters.
Explanation:The thickness of a piece of aluminum (Al) foil can be calculated knowing its mass, area, and the density of aluminum. First, we need to find the volume of the aluminum, which can be done by dividing the mass by its density. Since the density is provided in g/cm³ and the mass in grams, we skip any conversion for these two. However, we have the area in ft² which needs to be converted to cm² (1 ft² = 929.0304 cm²).
To find the volume (V) in cm³, we use the formula V = mass / density. In this case, V = 3.716 g / 2.699 g/cm³ = 1.3764 cm³. Now, we convert the area from ft² to cm²: area = 1.000 ft² * 929.0304 cm²/ft² = 929.0304 cm². The thickness (T) in cm can now be found by dividing the volume by the area T = 1.3764 cm³ / 929.0304 cm² = 0.00148 cm or 0.0148 mm when converted to millimeters.
An ac generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
which term best describes the movement of waves and how they interact with one another?a.wave shape b.wave velocity c.wave behavior d.wave chemistry
The correct choice is
c.wave behavior.
wave behavior consists of refraction , reflection , interference . refraction talks about the movement of wave when it travels from one medium to another. reflection talks about how wave return back to same medium where it came from after hitting a surface. interference deals with how waves interact with each other.
So correct choice is wave behavior.
Which type of radiation has a negative charge? alpha beta gamma which type of natural radiation is pure energy? beta alpha gamma which type of natural radiation has the most massive particles? gamma alpha beta?
The Beta particles are negatively charged. Electromagnetic Radiation is pure energy (Gamma). The largest particles are alpha.
What is radiation?Atomic and subatomic particles as well as waves, such as those that characterize X-rays, heat rays, and light rays, move as a result of radiation. All staff is constantly being bombarded by radiation of both types, coming from both cosmic and terrestrial sources.
This page describes the properties and behavior of radiation and the stuff it interacts with. It also describes how energy is transferred from radiation to its surroundings.
There is a lot of focus on the effects of such an energy transfer on living things, including the typical effects on several biological processes (e.g., photosynthesis in plants and vision in animals).
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PLEASE ANSWER ASAP
Most scientists recommend reducing carbon dioxide emissions. Less carbon dioxide in the atmosphere would be expected to reduce the rate of global warming increase damage caused by acid rain decrease the number of biotic factors in ecosystems reduce destruction of the ozone layer
The time it takes for one wavelength to pass a fixed point is known as:
Answer:
A
Explanation:
A car approaches a police radar gun. how does the wavelength of the signal detected within the car compare with that emitted by the radar gun? the wavelength detected inside the car is longer. the wavelength detected inside the car might be shorter or longer depending on speed range. the wavelength detected inside the car is the same. the wavelength detected inside the car is shorter.
A formation of igneous rock on earth's surface is known as ______.
The rocks originated from cooled and crystallized magma flown from the volcanic eruptions on planet surfaces is called igneous rocks. They are also called magmatic rocks due to their formation from magma.
A formation of igneous rocks on the earth's surface is known as extrusive, or volcanic igneous rocks.
How igneous rocks are formed?They can be originated in the form of intrusive or extrusive manner. The lava from volcanic eruptions causes the deposition of cooled magma on Earth surfaces and that solidifies after sometimes resulting in the formation of extrusive igneous rocks.The extrusive igneous rocks are formed near or above planet surfaces while the intrusive forms below the planet surface because magma cools slowly in intrusive igneous formation compared to fast cooling of extrusive rock formation.Therefore, the appearance of igneous rocks on the earth's surface is known as extrusive igneous rocks.
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