Is resistance greater or lesser in a hotter wire?

When Amelia apply brakes the car will start reducing its speed and then finally stop

So here as per Newton's First law we can say all object continue its state of motion until and unless some unbalanced external force act upon its.

This property is due to inertia of the object which is the property of mass. Here inertia is the property which resist the change in state of motion of an object.

If brakes are applied and an object stops after some time (let say t = 5 s) and on applying brakes other object stop in other time (let say t = 10 s) then if other object took longer time to stop then it means its inertia will be more.

So its all depends on inertia of object that how much time it will take to stop after applying brakes

So correct answer is

B.  inertia

Answer:

B

Explanation:

Inertia

Trade winds near equator blows in curve path instead of straight path. This is because of earth rotation. This effect of earth rotation that cause wind to move in curve motion is called Coriolis effect. These kind of wind blows at the northeast of the North hemisphere and southeast of the South hemisphere. The trade wind are warm and it blows due to rising of hot air from equator.

Final answer:

Trade winds don't blow straight toward the equator because the Coriolis effect causes deflection to the right in the northern hemisphere, forming northeast trade winds, and to the left in the southern hemisphere, forming southeast trade winds.

Explanation:

The trade winds don't blow straight toward the equator due to the influence of the Coriolis effect, which is caused by the rotation of the Earth. In the northern hemisphere, air moving toward the equator is deflected to the right, creating the northeast trade winds. Conversely, in the southern hemisphere, air moving toward the equator is deflected to the left, resulting in the southeast trade winds. These winds converge near the equator in the Intertropical Convergence Zone (ITCZ), leading to very wet conditions and the formation of the world's great rainforests.

i believe it is element or compound

Final answer:

Gravity according to Newton is a pulling force between objects with mass, while Einstein's general relativity posits gravity as the warping of spacetime by mass. While Newton's theory works well for less extreme situations, Einstein's accommodates oddities in strong gravitational fields and explains anomalies like Mercury's orbit that Newton's law could not.

Explanation:

Understanding Gravity: From Newton to Einstein

In his universal law of gravitation, Sir Isaac Newton described gravity as a force that pulls any two objects with mass toward one another, proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This concept allowed Newton to explain both the motion of falling objects on Earth and the celestial movements of planets and moons. Objects are drawn towards each other along a line connecting their centers, similar to an invisible 'tug of war.'

Albert Einstein's theory of general relativity, on the other hand, provided a revolutionary understanding of gravity. Instead of viewing gravity as a force, Einstein described it as the warping of spacetime by mass. Massive objects distort the fabric of spacetime, creating what we perceive as gravitational attraction, akin to how a heavy object placed on a stretched-out sheet would cause it to curve and objects around it to roll towards the impression.

Newton's theory operates exceptionally well for everyday phenomena and has been crucial for developments like space travel. However, Einstein's general relativity illuminates peculiar behaviors in strong gravitational fields, such as around black holes, and accounted for the precession of Mercury's orbit, a detail classical physics could not explain. While Einstein's model modifies Newton's, both theories address the observed accelerations of massive bodies influenced by gravity.

It is essential to note that while Einstein's theory adjusts Newton's laws, it does not render them obsolete. Einstein's predictions coincide with Newton's in situations of weaker gravitational fields - a testament to the accuracy of Newton's calculations in familiar conditions. This congruence illustrates Einstein's respect for the robustness of Newtonian physics while extending our understanding to the cosmos's most extreme environments.

Answer:

Water is a simple compound.

Explanation:

Water, from first glance, is a simple compound. This is because it is made up of two atoms - hydrogen and oxygen. This gives the formula:

[tex]H_{2}O[/tex]

In the simple compound, one atom of oxygen is bound to two hydrogen atoms like this:

[tex]H - O - H[/tex]

The bonding in water is hydrogen bonding.  This is a bonding that takes place between the oxygen atom and a hydrogen atom of the next water molecule.

This makes the water molecule an interesting molecule.

here we need to write the two components of the displacement and then we need to add them

first displacement is given as

[tex]d_1 = 75 km[/tex] 30 degree West of North

[tex]d_1 = - 75 sin30 \hat i + 75 cos 30 \hat j[/tex]

[tex]d_1 = - 37.5 \hat i + 64.9\hat j[/tex]

Other displacement is given as

[tex]d_2 = 155 km[/tex] 60 degree due East of North

[tex]d_2 = 155 sin60 \hat i + 155 cos60 \hat j[/tex]

[tex]d_2 = 134.2 \hat i + 77.5 \hat j[/tex]

now we need to find the net displacement

[tex]d = d_1 + d_2[/tex]

[tex]d = (-37.5 + 134.2)\hat i + (64.9 + 77.5)\hat j[/tex]

[tex]d = 96.7\hat i + 142.4\hat j[/tex]

so it is given as

[tex]d = \sqrt{96.7^2 + 142.4^2}[/tex]

[tex]d = 172.1 km[/tex]

and its direction is given as

[tex]\theta = tan^{-1}\frac{96.7}{142.4} = 34.1 degree[/tex]

so it will displace by 172.1 km at 34.1 Degree East of North

As a student, to reduce waste, you should recycle materials like old books, start a compost program at school, buy used items, and properly recycle electronics. Avoid actions that are against the reduce, reuse, and recycle principles like disposing reusable products, replacing items prematurely, or trashing computer equipment.

To reduce the amount of waste you make as a student, focus on actions that adhere to the Reduce, Reuse, and Recycle principles. Firstly, recycle your old books, newspapers, and magazines instead of throwing them away. Starting a compost program at school will help reduce food waste by turning it into nutrient-rich soil instead of contributing to landfill mass.

Other actions include buying used or fewer items, maintaining and repairing products to extend their lifespan, and borrowing or sharing infrequently used items. Always avoid disposing of products that can still be reused, and do not replace items before they wear out. Moreover, never throw away computer equipment; recycle it properly as electronic waste can be hazardous to the environment.

Recycling efforts in your community are important; participate by separating recyclables like aluminum, plastics, glass, and paper. Encourage and join initiatives at school to promote recycling and conservation.

Answer: Based on the weather station symbols shown below, what is the most likely location of the low pressure system?

A.Just West of City A.

Answer:

a) Acceleration, a = -u/9, where u is the initial velocity

b) Acceleration = 0.741 m/s², Initial velocity = 6.67 m/s

Explanation:

 We have equation of motion, v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.

a)  We have v = 0 m/s, t = 9 s

 So,    0 = u + a x 9

      Acceleration, a = -u/9, where u is the initial velocity

b) We have equation of motion , [tex]s= ut+\frac{1}{2} at^2[/tex], s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

 s = 30 m , u = -9a, t =9 s

 So,  [tex]30= -9a*9+\frac{1}{2} *a*9^2\\ \\ 30=-40.5a\\ \\ a=-0.741m/s^2[/tex]

u = -9a = 6.67 m/s

So acceleration = 0.741 m/s², Initial velocity = 6.67 m/s

Final answer:

The answer explains how to calculate the acceleration of the puck given the distance it traveled and the time taken. It further details how to find the initial velocity of the puck using the acceleration obtained earlier.

Explanation:

A. To determine the acceleration of the puck, we can use the equation:

a = 2x / t^2

Substitute the values given: x = 30m and t = 9s.

b. To find the initial velocity of the puck, we first calculate the acceleration using the formula a = Δv / t, where Δv = final velocity - initial velocity.

Then, knowing the acceleration from part (a), we can calculate the initial velocity using the equation v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time taken.

T = tension force in the cable

m = mass of the flowerpot = 10 kg

θ = angle cable makes with the horizontal = 30 deg

there are horizontal and vertical components of tension force . The vertical component of tension force in cable is in opposite direction of the weight of the flowerpot. hence vertical component of tension balances the weight of flowerpot. so we can write

T Sinθ = mg

inserting the above value

T Sin30 = 10 x 9.8

T(0.5) = 98

T = 98/0.5

T = 196 N

Answer:

vertical distance, s = 0.16 meters

Explanation:

It is given that,

An amateur player is about to throw a dart with an initial velocity of 15 meters/second onto a dartboard.

Dashboard is placed at a distance of 2.7 meters.

Calculating time from velocity and distance i.e. [tex]t=\dfrac{d}{s}=\dfrac{2.7}{15}\ s=0.18\ s[/tex]

Using second equation of motion for finding vertical distance :

[tex]s=ut+0.5gt^2[/tex]

Here, u = 0 (for vertical velocity )

[tex]s=0.5gt^2[/tex]  

[tex]s=0.5\times 10\times (0.18)^2[/tex]        

s = 0.162 meters

or s = 0.16 meters

Hence, the vertical distance by which the player will miss the target if he throws the dart horizontally, in line with the dartboard is 0.16 meters.

Ball is thrown at an angle of 20 degree with velocity 18 m/s

so first we will find the two components of the velocity

[tex]v_x = 18 cos20[/tex]

[tex]v_x = 16.91 m/s[/tex]

similarly for other component

[tex]v_y = 18 sin20[/tex]

[tex]v_y = 6.16 m/s[/tex]

now the ball will cover horizontal distance of 30 m till it reach to other player

so here we can use the formula of time

[tex]x = v_x * t[/tex]

[tex]30 = 16.91 * t[/tex]

[tex]t = \frac{30}{16.91}[/tex]

[tex]t = 1.77 s[/tex]

so it will take 1.77 s to reach the other player

Answer:

1.77 on ed2020

Explanation:

the amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound. In Figure 10.2 sound C is louder than sound B. hope i helped!

(sorry if wrong)

f=ma is newton's second law ...68x1.2=68+2/10x68 = 68+13.6=81.6n

Answer:

81.6N

Explanation:

Force = Mass x Acceleration

Force = 68 x 1.2

Force = 81.6

Units = Newtons

81.6 N

(81.6 Newtons)

no. energy is not created or destroyed, just transformed.

a hot light source is less efficient than a cold one ... heat is not light ...

The term 'inefficient' in energy transformations does not mean that energy is destroyed. Instead, it refers to the second law of thermodynamics, where some energy is always lost in an unusable form, typically as heat, during the transformation process.

When scientists state that energy transformations are inefficient, they don't mean that energy is destroyed. Rather, they're referring to the fact that in every energy transfer or transformation, a portion of that energy is lost in a form that is unusable, most often as heat energy. This concept is based on the second law of thermodynamics, which states that no energy transfer is entirely efficient.

In an isolated system, according to the first law of thermodynamics, energy cannot be created or destroyed but only converted from one form to another. However, not all forms of energy are useful in doing work. During these energy transformations, some energy inevitably gets 'degraded' into a less useful form, such as waste heat.

For instance, when an airplane flies through the air, some of the plane's energy is lost as heat due to friction with the surrounding air. Similarly, during cellular metabolic reactions, some energy is lost as heat. This is beneficial for warm-blooded animals like us, as it helps in maintaining our body temperature.

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The reciprocal of resistance or measure of a devices ability to conduct is called Conductance. Conductance is the ability of material that allows electricity to pass through it. The unit of conductance is seimens. It can also be represented by "mho" , inverse of "ohm" which is unit of resistance. Best example of conductive metals are silver and copper. Materials that allows conductivity are called Conductor. Material that partially allows conductivity are called Semi-conductor. Material that does not allow conductivity are called Insulator.

Conductance can also be defined as ability to flow. The term conductance is not only used for electrical conductivity, but it is also used for thermal conductivity and fluid conductivity.

Answer:

conductance

Explanation:

Final answer:

The potential energy gained by driving the car from sea level to Nu’uanu Pali lookout is approximately 3,589,260 joules.

Explanation:

To calculate the potential energy gained by driving your car from sea level up to the Nu’uanu Pali lookout, we can use the formula: PE = mgh, where m is the mass of the car, g is the acceleration due to gravity, and h is the change in height. In this case, the mass is 1000 kg, g is approximately 9.81 m/s², and h is 366 m. Plugging in the values, we get:

PE = 1000 kg * 9.81 m/s² * 366 m = 3,589,260 joules

So, driving your car up to the Nu’uanu Pali lookout increases its potential energy by approximately 3,589,260 joules.

Answer : It experience the acceleration is, [tex]7.5m/s^2[/tex]

Explanation :

By the 1st equation of motion,

[tex]v=u+at[/tex] ...........(1)

where,

v = final velocity = 85 m/s

u = initial velocity  = 23 m/s

t = time = 8.3 s

a = acceleration = ?

Now put all the given values in the above equation 1, we get:

[tex]85m/s=23m/s+a\times (8.3s)[/tex]

[tex]a=7.5m/s^2[/tex]

Thus, it experience the acceleration is, [tex]7.5m/s^2[/tex]

Answer:

[tex]T_2 = 1.40 hours[/tex]

Explanation:

As per kepler's law of time period we know that

square of time period is proportional to the cube of the distance

so here we can say

[tex]\frac{T_1^2}{T_2^2} = \frac{r_1^3}{r_2^3}[/tex]

so we know that

for moon

[tex]T_1 = 27.4 days[/tex]

[tex]r_1 = 384,400 km[/tex]

[tex]r_2 = 6370 km[/tex]

now from above formula we have

[tex]\frac{27.4^2}{T_2^2} = \frac{384,400^3}{6370^3}[/tex]

[tex]T_2 = 0.058 days[/tex]

[tex]T_2 = 1.40 hours[/tex]

Using Kepler's third law and the period of the Moon, we find that an artificial satellite very close to Earth has a period of approximately 1.41 hours. This involves comparing the orbital radii and periods using the proportional relationship given by Kepler's law. Substituting values and simplifying yields the final period.

To determine the period of an artificial satellite orbiting very near the Earth’s surface using Kepler’s laws, we will use Kepler's third law, which states that the square of the orbital period (T) is proportional to the cube of the average orbital radius (r). Given the following:

Now, add the radius of the Earth to get the orbital radius of the satellite, r2 = rE + 0 = 6.38 × 106 m. According to Kepler’s third law ([tex]T_2[/tex] ∝ [tex]r_3[/tex]), we have:

Substitute the known values:

Simplifying the right side:

Taking the square root of both sides to solve for [tex]T_2[/tex] :

Converting days to hours (1 day = 24 hours):

Therefore, the period of an artificial satellite orbiting very near the Earth’s surface is approximately 1.41 hours.

The different colors in the sky are caused by the scattering of sunlight in Earth's atmosphere. Blue light scatters more efficiently than other colors, resulting in the blue color of the sky.

The different colors that appear in the sky are caused by the scattering of sunlight. When sunlight enters Earth's atmosphere, it scatters from the molecules of air. The small size of the air molecules causes blue light to scatter more efficiently than other colors, such as greens, yellows, and reds. Therefore, the blue light is scattered all over the sky, resulting in the blue color of the sky.

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I'm pretty sure you can find it out by using a speed monitor and compass or just observing it

if there any answer choices tell me.

The friction force is equal to 120 N. This is based on Newton's First Law. The friction force balances the pushing force, thus keeping the box stationary.

When you push on a large box with 120 N of force and it does not move, it means that the friction force opposing your push is equal to the pushing force. This is based on Newton's First Law of Motion which states that an object in motion tends to stay in motion and an object at rest tends to stay at rest unless acted upon by an unbalanced external force. Friction is the resisting force that occurs between two surfaces in contact when one or both of the surfaces are moved or attempt to move. In this case, the friction force is 120 N because it precisely offsets the applied force, keeping the box stationary.

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Answer:imagine Bohr coming up to you and saying i have 2 atoms; it sticks together and becomes a compound.

Explanation:

Answer:

option a

Explanation:

Answer:

A ( 11; the number of protons

Explanation:

if the atomic mass is 11 that means there are also 11 protons

materials, metals, gold

Final answer:

The movement of heat or electricity occurs through materials called conductors, with metals like copper and silver being excellent examples due to their high number of free electrons that facilitate this transfer.

Explanation:

The movement of heat or electricity through materials. Metals are good conductors, particularly copper and silver.

Good electrical conductors are often good heat conductors, too. This is because large numbers of free electrons can carry electrical current and can transport thermal energy. Materials like copper, aluminum, gold, and silver are excellent conductors of both electricity and heat due to their high number of free electrons, which allow them to transfer thermal energy efficiently. On the other hand, insulators such as wood, plastic, and rubber are poor heat conductors because they lack these free electrons.

Understanding the conduction of electricity and heat is fundamental in industries and applications that require efficient energy transfer, including electronic components and cooking utensils. Metals are frequently employed in these applications; for example, metals like copper are used in wires for electricity transmission, while cooking utensils are made of metals because of their superior heat conduction abilities.

here we can use energy conservation

like initial kinetic + potential energy is always conserved and it will be same at all points

so we can say

[tex]KE_i + PE_i = KE_f + PE_f[/tex]

[tex]\frac{1}{2}mv_i^2 + mgh_1 = \frac{1}{2}mv_f^2 + mgh_2[/tex]

now we can plug in all the given values in it

[tex]v_i = 0[/tex]

[tex]h_1 = 443 m[/tex]

[tex]h_2 = 221 m[/tex]

[tex]\frac{1}{2}m*0 + m*9.8*443 = \frac{1}{2} m*v_f^2 + m*9.8*221[/tex]

now divide whole equation by mass "m"

[tex]9.8*443 = \frac{1}{2} v_f^2 + 9.8*221[/tex]

[tex]2175.6 = \frac{1}{2}v_f^2[/tex]

[tex]v_f = 65.96 m/s[/tex]

so final speed will be 65.96 m/s

Answer: The work OUTPUT of a simple machine can never exceed the work INPUT because FRICTION uses some of the work.

Explanation:

This concept is related to ideal machines and efficiency.

Only ideal machines can convert all the work input into useful work (work ouput).

The efficiency is a concept that tells you the proportion of input work that is transformed into output work.

         Efficiency = (output work / input work) × 100

Ideal machines, those where friction does not exist, have a 100% efficiency, and so ideal machines convert all the input work into useful output work.

Real machines have a efficiency less than 100%. Friction lowers the efficiency and the work outpu is less than the work input, because friction uses work which is converted, mostly, into heat energy or sound energy.

Here's the formula to use:

D = 1/2 A T²

Distance = (1/2) (Acceleration) (time)²

Now let's use it:

Distance = (1/2) (9.8 m/s² for Earth gravity) (1.2 seconds)²

Distance = (4.9 m/s²) (1.44 sec²)

Distance = (4.9 x 1.44) (m-s² / s²)

Distance = 7.06 meters