If the current through a resistor is cut in half, how does the power dissipated by the resistor change? (P=0VI=1^ 2 R= V^ 2 R )

Answer:

3 sig figs total mass is 54.32g

Explanation:

It is 3 sig figs because that is the accuracy that Block A was measured to

Answer:

5.48 m/s

Explanation:

We can find the final velocity of the basketball by using the SUVAT equation:

[tex]v^2 - u^2 = 2ad[/tex]

where

v is the final velocity

u = 4.0 m/s is the initial velocity

[tex]a=0.50 m/s^2[/tex] is the acceleration

d = 14 m is the distance covered

Solving the equation for v, we find:

[tex]v=\sqrt{u^2 +2ad}=\sqrt{4.0^2+2(0.50)(14)}=5.48 m/s[/tex]

Answer:

A: The frequency of the vibration is 1.3329 Hz

B: The total energy of the vibration is  18.39375 J

Explanation:

The force of the man his weight causes the raft to sink, and that causes the water to put a larger upward force on the raft.  This extra force is a restoring force, because it is in the opposite direction of the force put on the raft by the man.  Then when the man steps off, the restoring force pushes upward on the raft, and thus the raft – water system acts like a spring, with a spring constant found as follows:

k= F/x = ((75 kg) * (9.81 m/s²))/(5*10^-2 m) = 14715 N/m

The frequency of the vibration is determined by the spring constant (k) and the mass of the raft (210kg).

fn = 1/2π * √(k/m)  = 1/2π * √(14715 / 210) = 1.3329 Hz

The frequency of the vibration is 1.3329 Hz

b)

Since the gravitational potential energy can be ignored, the total energy will be :

Etot = 1/2 k* A² = 1/2 * (14715 )*(0.05)² = 18.39375 J

The total energy of the vibration is  18.39375 J

Answer:

47.9 m

Explanation:

Given:

y₀ = 0 m

t = 6.25/2 = 3.125 s

v = 0 m/s

a = -9.8 m/s²

Find: y

y = y₀ + vt − ½ at²

y = 0 + (0)(3.125) − ½ (-9.8)(3.125)²

y = 47.9 m

We have that for the Question "A baseball is popped straight up into the air and has a hang-time of 6.25 S.

Determine the height to which the ball rises before it reaches its peak. (Hint: the  time to rise to the peak is one-half the total hang-time.)" it can be said that Hence, the height to which the ball rises before it reaches its peak is

S=47.85m

From the question we are told

A baseball is popped straight up into the air and has a hang-time of 6.25 S.

Determine the height to which the ball rises before it reaches its peak. (Hint: the  time to rise to the peak is one-half the total hang-time.)

Generally the Newtons equation for the distance   is mathematically given as

[tex]s=ut+1/2at^2\\\\\ Where \\\\T=\frac{6.25}{2}\\\\T=3.125\\\\[/tex]

Therefore

[tex]s=0+1/2(9.8)(3.125)^2[/tex]

S=47.85m

Hence, the height to which the ball rises before it reaches its peak is

S=47.85m

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Answer

The intensity of a sound wave depends on the pressure of the wave,density of the medium and speed of sound in the medium. Higher density and higher sound speed both give a lower intensity. and may be it is because that sound wave is more characterize by wavelength than frequency..explanation

Explanation:

As decibel levels get higher, sound waves have greater intensity and sounds are louder. For every 10-decibel increase in the intensity of sound, loudness is 10 times greater. Intensity of sound results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound.

Final answer:

The intensity of sound waves can be increased by raising the amplitude of the wave oscillations, which can be done by increasing the volume on the speaker or enhancing the instrument's playing technique, such as pressing a bow more firmly against stringed instrument strings.

Explanation:

To increase the intensity of sound waves, one can manipulate several factors. The intensity (I) of a sound wave is directly proportional to the square of its amplitude (Δp) and inversely proportional to the density (p) and the speed (vw) at which the wave travels, as per the equation I = (Δp)2 / (2pvw). Therefore, increasing the amplitude of sound wave oscillations will result in a more intense sound. This can be achieved, for example, by increasing the volume on a speaker, which increases the amplitude of the sound waves it produces.

Additionally, when sound travels through a medium such as a string, the medium's tension can affect sound intensity. A tight string will transmit sound waves more efficiently than a loose one. Similarly, when a bow is pressed more firmly against the strings of a musical instrument, the increased normal force results in a higher frictional force, which in turn increases the work done (W = Fd) and subsequently the amplitude of the produced sound wave.

It's also important to note that the amplitude and loudness of a sound wave are related; a wave with larger amplitude typically sounds louder because it carries more energy. The energy carried by a wave is proportional to the amplitude squared, meaning doubling the amplitude increases the power by a factor of four. Moreover, the frequency of the sound also impacts the energy reaching your ear, as higher frequency sound waves make the same amplitude hit your eardrum more often.

When a car brakes to a stop, its kinetic energy is transformed primarily into thermal energy due to friction. The brakes and tires may become warm as a result of this energy conversion. Energy is neither lost nor does it become unobservable potential energy; it simply changes form in accordance with the law of conservation of energy.

When a car brakes to a stop, its kinetic energy is transformed into other forms of energy. This is a fundamental concept in physics related to the conservation of energy, which tells us that energy cannot be created or destroyed, only transformed from one form to another. In the case of a car stopping, the kinetic energy is mostly converted into thermal energy due to the friction between the car's brakes and wheels. This energy transfer can cause the brakes and tires to warm up, and it is why they may feel hot after use. Additionally, some of the energy may be transferred to the surroundings as the car interacts with the air, causing air movement and sound.

The explanation that kinetic energy is transformed into potential energy to be used later is incorrect. Potential energy is related to an object's position in a gravitational field, not its motion. Thus, when the car stops, its kinetic energy does not become potential energy. Similarly, saying that the kinetic energy is still there but not observable is also incorrect, as the kinetic energy has been converted into other forms. The idea that kinetic energy is lost and not conserved is also a misconception because energy conservation is a fundamental law of physics.

Final answer:

When a car brakes to a stop, the kinetic energy is transformed into heat energy through friction.

Explanation:

When a car brakes to a stop, the kinetic energy of the car is transformed into heat energy. The brakes use friction to reduce the car's speed, and as a result, the kinetic energy is converted into heat energy. This can be observed by the warmth of the tires and the fact that the brakes can become very hot after coming to a stop.

Answer:

10 Is the last one (D)  11 is the one you picked, or the third option. (C)

Explanation:

We can confirm that the statement made in the question is in fact true, a healthy body weight is associated with a low BMI.

BMI is the acronym for "Body Mass Index". This is a measurement that indicates the fat contents of the body of the individual being measured. A low BMI is associated with healthy body weight as it indicated low levels of fat. Anything below 25% is considered to be acceptable, while anything below 15% is considered to be fit/athletic.

Therefore, we can confirm that this statement is in fact true, as a low BMI indicates low fat levels and therefore is associated with healthy body weight.

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The statement associating a low BMI with a healthy body weight is false. A healthy body weight, as indicated by BMI, falls within the 18-24.9 range. However, BMI is an imperfect measure and can be misleading due to its disregard for muscle mass, fat distribution, and bone density.

The statement that a healthy body weight is associated with a low body mass index (BMI) is False. A healthy body weight, as indicated by BMI, falls within a range. A BMI ranging from 18-24.9 is considered normal weight, 25-29.9 is considered overweight, and a BMI greater than 30 is considered obese. However, BMI has its limitations. It does not account for muscle mass, fat distribution, or bone density, which can lead to inaccuracies in determining actual health status. A muscular person may have a high BMI but low body fat, while an individual with less muscle mass might have a lower BMI but higher body fat percentage.

Answer:

A. Energy is lost when machines don't work right.

Explanation:

Energy cannot be created nor destroyed, according to the Law of Conservation of Energy.

Answer:

Ampere

Explanation:

The ampere is the unit of measurement in the international system. Its equal to a coulomb/second. It can be describe as the rate of charges flowing throught a conductor

If you're talking water current, it could be gallons per hour, liters per second, acre feet per month, feet per second, mile per hour, etc. Any time rate of volume or distance.

If you're talking electrical current, then the unit is almost certainly 'Amperes' .

I believe your answer is Ionic solids.

Answer:

a drought

Explanation:

bullfrogs would only need to store more water if they would go longer periods of time without it - think about how cacti store all the water they can in desert, since there is not a lot of water there.

Answer: 516 m

Explanation:

Speed [tex]V[/tex] is defined as the distance traveled [tex]d[/tex] in a especific time [tex]t[/tex]:

[tex]V=\frac{d}{t}[/tex]

Where:

[tex]V=344 m/s[/tex] is the speed of sound

[tex]t=1.5 s[/tex] the time you hear the thunder after you see the flash of lightning

We need to find the distance at which you are from the lightning strike:

[tex]344 m/s=\frac{d}{1.5 s}[/tex]

Finding [tex]d[/tex]:

[tex]d=(344 m/s)(1.5 s)[/tex]

Finally:

[tex]d=516 m[/tex]

Final answer:

To calculate the distance of a lightning strike using the sound of thunder, multiply the time delay of 1.5 seconds by the speed of sound (344 m/s), giving an answer of 516 meters or approximately 0.516 kilometers.

Explanation:

When observing a lightning strike, we often witness the light (the flash) well before we hear the sound (thunder) due to the speed of light being much faster than the speed of sound. In the given scenario, if you hear thunder 1.5 seconds after seeing a flash, we can calculate the distance to the lightning strike by multiplying the time it took to hear the thunder by the speed of sound in air.

Since the speed of sound is approximately 344 m/s, we can estimate the distance to the lightning strike with the following calculation:

Distance = Speed of Sound × Time Delay
Distance = 344 m/s × 1.5 s
Distance = 516 m

Converted to kilometers, the lightning strike was approximately 0.516 km away from you.

Answer:

A. pulls back on the Earth, which is the main cause of the rise and fall of the ocean tides on Earth.

The moon’s gravity pulls back on the Earth. Therefore, option (A) is correct.

The Moon's gravity can be described as the acceleration due to gravity on the surface of the Moon. The value of g on the Moon can be calculated by considering the mass of the Moon and earth.

The mass of the Moon is equal to 7.342 x 10²² kg which is 1.2% of the mass of the earth and the radius of the Moon = 1.74 x 10⁶ m

Since the formula to calculate the value of g = GM/r2

The value of the g for the Moon is equal to 1.652 m/s² which is 16.7 % of the gravity of the earth.

The moon's gravity on the Earth is the reason for the rise and fall of ocean tides. The moon's gravitational pull arises two bulges of water on the oceans of the earth in which one where ocean waters face the moon and the pull is strongest and another where ocean waters face away from the moon and the pull is weakest.

Therefore, the gravity of the moon pulling back on the Earth is the correct option.

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Answer:

65 m/s north

Explanation:

The velocity of an object is given by:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement of the object

t is the time interval needed for the displacement

For the rocket in this problem,

d = 390 m north

t = 6 s

So the velocity is

[tex]v=\frac{390}{6}=65 m/s[/tex] north

It is important to keep in mind that velocity is a vector, so it both has a magnitude (65 m/s) and a direction (which is equivalent to that of the displacement, so in this case north).

Melting

Explanation:

This process is called melting in which a solid changes to a liquid

Answer:

g = -9.8 m/s²

Explanation:

Gravity is the only force pulling on any object in free fall. Gravity near earth's surface pulls with an acceleration g.

The acceleration of the ball is -9.8 meter per sec square acting as deceleration when the ball left the hand after being thrown upwards.  

Explanation:

The ball is thrown with a speed of 14 m/s and the moment it comes into the projectile, gravity starts to work on it. The gravity applies the uniform acceleration of 9.8 m/s^2.

This acceleration is in the form of deceleration [the negative acceleration] is termed as the deceleration. And here, the ball is thrown opposite to the gravity and hence the motion is against the gravity, the acceleration becomes -9.8 m/s^2.

The slope of a velocity-time graph represents the acceleration of an object.

Acceleration is the rate of change of velocity over time. A steeper slope indicates a greater acceleration, meaning the object is speeding up or slowing down more rapidly.

A horizontal line on the graph, where the slope is zero, indicates constant velocity, implying no acceleration. If the slope is negative, the object is decelerating or moving in the opposite direction. In summary, the slope of a velocity-time graph provides valuable information about how an object's velocity changes over time, offering insights into its acceleration or deceleration behavior.

Answer:

A. repetition, completing more trials for each solution

Explanation:

In this experiment, the two differ in results that is why they ca not agree on the next step.This happens when experimental results do not confirm the hypothesis of the experiment.In such cases, you are required to assess the stages in the experiment which are- the hypothesis, the experimental stages,the analysis stage and the result stage.The key here is to go through the write up of the experiment to see the problems that cause the variations in results.

In this case where they were testing the freezing points of several solutions, there are four cognitive properties of a solution that affects the solvent. They are lowering of vapor pressure, lowering of freezing point, rise in boiling point or initiation of an osmotic pressure in the process.When they perform more trials for each solution, they will see if they carried out the experiment correctly.

Answer:

A. Repetition, completing more trials for each solution

Explanation:

Just got it right on Edg :)

Answer:

a = 2d / t²

Explanation:

d = ½ at²

Multiply both sides by 2:

2d = at²

Divide both sides by t²:

a = 2d / t²

The solution of the acceleration a would be (2dt²) by using the equation d=1/2at²

Newton provided three equations of motion.

This is how the first equation is presented.

v = u + at

The second equation is given as follows.

d= ut + 1/2×a×t²

Following is the third equation.

v² - u² = 2×a×d

Keep in mind that only uniform acceleration is supported by these equations. where the initial and final velocities, respectively, are u and v.

d is the object's overall distance traveled, and a represents its acceleration.

As given in the problem we have to solve the acceleration by using newtons second equation given that the initial velocity is zero

By using The second equation is given as follows.

d = ut + 1/2×a×t²

as u =0

d=1/2at²

a = d/(1/ 2t²)

a =2dt²

Thus, The solution of the acceleration a would be (2dt²) by using the equation d=1/2at²

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speed = wavelength × frequency

but the frequency was given to as

10khz ,

which means

[tex] {10}^{3} [/tex]

= 1000

so now frequency = 1000hz

substitute it into the equation

speed = 1000×2

speed = 2000ms^-1

The speed of the wave with the frequency of 10 kHz and a wavelength of 2 meters is 20,000 meters per second, or 20 km/s.

To calculate the speed of a wave, we can use this simple physics formula: speed = frequency × wavelength. In this case, the frequency of the wave is 10 kHz (or 10,000 Hz) and wavelength is 2 meters. Knowing these values, we can substitute them into the formula.

Speed = 10,000 Hz × 2 meters

Therefore, the speed of the wave is 20,000 meters per second, or 20 km/s.

The speed of the wave with the frequency of 10 kHz and a wavelength of 2 meters is 20,000 meters per second, or 20 km/s.

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Answer:

2 m/s²

Explanation:

Acceleration is change in velocity over change in time.

a = Δv / Δt

a = (18 m/s − 10 m/s) / 4 s

a = 2 m/s²

The acceleration of a car going 10 m/s and 4 seconds later it is going 18 m/s is 2m/s².

HOW TO CALCULATE ACCELERATION:

Where;

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Answer:

1.75 s

Explanation:

The vertical position of the rock at time t is given by:

[tex]y(t) = h +ut - \frac{1}{2}gt^2[/tex]

where

h = 15.0 m is the initial height

u = 0 is the initial velocity

g = 9.8 m/s^2 is the acceleration of gravity

t is the time

When the rock reaches the bottom of the cliff,

y(t) = 0

Substituting this condition into the previous equation, we can find the time at which the rock reaches the bottom of the cliff:

[tex]0 = h - \frac{1}{2}gt^2\\t= \sqrt{\frac{2h}{g}}=\sqrt{\frac{2(15.0)}{9.8}}=1.75 s[/tex]

Answer:

The state of matter that has the most energy is gas.

Explanation:

In a solid, there is limited room for molecules to move around.

Answer:

The greatest amount of particle movement is in gaseous state of matter.

Explanation:

It is known that matter can be classified as solid, liquid and gas states. The molecules in each state exhibit vibrations or movement of particles will be occurring in them. The kinetic energy exhibited by the different states of matter depend upon the bond strength.

If the bond strength is more and if the particles are densely packed like in solids. So the gas state has least bond strength and they are loosely packed molecules and thus the particles can move freely with more kinetic energy.

t=5s

it was correct on my do-now

so I hope it was useful for you

Answer:

Time, t = 5 seconds          

Explanation:

It is given that,

Initial speed of the bike, u = 8 m/s

Final speed of the bike, v = 14 m/s

Length of the hill, d = 55 m

Firstly, we can find the acceleration of the bike. Let it is equal to a. It can be calculated using third equation of motion as :

[tex]a=\dfrac{v^2-u^2}{2d}[/tex]

[tex]a=\dfrac{(14)^2-(8)^2}{2\times 55}[/tex]  

[tex]a=1.2\ m/s^2[/tex]

Let t is the time passes during the descent. It can be calculated using the first equation of motion as :

[tex]t=\dfrac{v-u}{a}[/tex]

[tex]t=\dfrac{14-8}{1.2}[/tex]      

t = 5 seconds

So, the time passes during the descent is 5 seconds. Hence, this is the required solution.                                                      

Answer:

A physical trait is visible to the naked eye, such as, having six fingers; and a character trait is invisible to the naked eye, such as, being charming. Both can be subjective, for instance, claiming somebody has a big nose is a subjective comment about somebody's physical appearance.

The difference between physical traits and personality traits are that physical traits are mainly determined by a person’s genes, personality traits are determined by both a person’s genes and environment.

Answer: Option B

Explanation:

Physical traits are facial similarities, body language, nature of hairs and skins. Mostly the face of siblings and the children will have some similarities with their parents or other members in their family.

So, we can say that physical traits are mainly determined by person’s genes. While the personality traits determine a person’s character , hobbies, likes, dislikes, point of view etc.

Thereby, the personality traits will be coming from genes and also from the environment the person has been grown. Both genes and environment effect equally on a persons’ character and personality.

Answer:

True.

Explanation:

Hypotheses are supposed to be tested, to be proven correct. They usually start from a small thought without 100% correct, but as you do further testing, they become stronger.

Answer: 1)True

Explanation:

A scientific hypothesis is a statement which is based on the the direct observation of a scientific event, process or phenomena. It can be based on the assumptions. It is testified using appropriate scientific methodology.

The scientific hypothesis can be proved to be negative or false but repeated experimental trials can prove a hypothesis true and acceptable.  

Answer:

mass number of 38

Explanation:

Charge is 0 - No. of protons is equal to nom.of electrons, so no charge

Atomic number is 18 - Atomic number is number of protons

Mass number is 38- mass number is number of protons AND neutrons

Answer:

a mass number of 38

Explanation:

X This atom has no a negative charge .

because, number of  protons (18) & electrons (18) are same. so,This atom is neutral.

X This atom has an atomic number of 20.

Because, it has 18 protons. so, This atom has an atomic number of 18.

X  This atom has a positive charge

because, number of  protons (18) & electrons (18) are same.so,This atom is neutral.