what mass of aluminum metal would absord 250 kj when it melted at its melting point? the heat of fusion for aluminum is 396.6 j/g

Galileo Galilei made the first detailed observations of the largest planet in our solar system.

Galileo Galilei made the first detailed observations of Jupiter in solar system. Galileo is renowned for his discoveries. He was the first to report telescopic observations of mountains on the moon, moons of Jupiter,  phases of Venus, and rings of Saturn. He also invented an early microscope and a predecessor to the thermometer.

Galileo's discoveries about the Moon, Jupiter's moons, Venus, and sunspots supported the idea that the Sun was the center of the Universe.  Work of Galileo also laid the foundation for today's modern space probes and telescopes.

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If a comet flies over 50,000 km/h for four hours, then comet has travelled a distance of 2 * 10^5 km.

Speed distance time is the formula that is used to explain the relationship between speed, distance and time. Here, speed = distance ÷ time. We can also say that distance divided by speed will give you the time. Provided you know two inputs, then you can work out the third one.

Given Speed is 50,000 km/h and time is 4 h

We know that distance is speed * time

= 50,000 * 4

= 2 * 10^5 km

Comet has travelled a distance of 2 * 10^5 km.

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The fact that the speed of light is constant (as it travels through a vacuum) has several important implications in physics, including:

1) Time dilation: The constancy of the speed of light is a fundamental postulate of the theory of special relativity.

This theory predicts that time dilation occurs when objects are moving at high speeds relative to each other.

This means that time appears to move slower for objects that are moving at high speeds relative to an observer who is at rest.

2) Length contraction: The constancy of the speed of light also predicts that lengths appear to be shorter for objects that are moving at high speeds relative to an observer who is at rest. This is known as length contraction.

3) Mass-energy equivalence: The constancy of the speed of light is also related to the famous equation E=mc^2, which states that mass and energy are equivalent and interchangeable.

This equation arises from the fact that the speed of light is a fundamental constant of nature.

4) Limitation of causality: The constancy of the speed of light also implies that there is a limit to the speed at which information can travel through the universe.

This means that there are limitations on causality and how quickly events can influence each other across space and time.

Overall, the constancy of the speed of light is a fundamental principle of physics, and has far-reaching implications for our understanding of the universe.

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The answers are (a) velocity, v=2.8m/s , mass, m=0.0038kg and x=0.055m.

(b) v=2.7m/s.

Any object or system that has stored energy as a result of its position or component arrangement is said to have potential energy. Nevertheless, it is unaffected by external factors like air pressure or altitude. On the other hand, kinetic energy is the force that propels a moving object or group of particles.

(a) By equating the compressed spring's potential energy to the cork's kinetic energy at release, we have

The formula is :

k = \(\frac{1}{2} mv^2\)

v = \(\sqrt{\frac{2k}{m} }\)

And potential energy of spring = \(\frac{1}{2}mx^2\)

On equating these two equations we get ;

v = x\(\sqrt{\frac{k}{m}\)

After substituting the value of x = 5.5 cm and m = 3.8g we would get

v=2.8m/s m=0.0038kg and x=0.055m.

(b) In the novel scenario, there is some potential energy present just before release. Energy conservation changes when d=0.015m.

Similarly solving the question we get :

v = 2.7 m/s

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Contaminants are substances or agents that are present in a material or environment, frequently in unwanted or hazardous proportions, and which may harm the environment, and human health.

They include pollutants that are released from industrial operations, agricultural practices, or human activities, such as pesticides, heavy metals, volatile organic compounds (VOCs), and polychlorinated biphenyls (PCBs).

They include pollutants that are released from industrial operations, agricultural practices, or human activities, such as pesticides, heavy metals, volatile organic compounds (VOCs), and polychlorinated biphenyls (PCBs).

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The energy density in the electric field of a point charge decreases as we move away from it. The energy density at a distance d from a point charge q is u.

If we now go to a distance d/2 from the charge, the energy density at the new location will be four times the energy density at distance d. This is because the energy density is inversely proportional to the square of the distance from the charge.

To understand this, consider the formula for energy density in an electric field:

u = (1/2)ε₀E²

where u is the energy density, ε₀ is the permittivity of free space, and E is the electric field strength. Since the electric field strength at a distance d/2 is four times stronger than at distance d (as E is inversely proportional to the distance from the charge), the energy density at the new location is four times greater than at distance d. Therefore, the energy density at the new location would be 4u.

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Answer:

b. 4 ms-2

Explanation:

acceleration = velocity / time

The mass m of the block on the left is 16 Kg , correct answer.

What is friction?

Friction is a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion.

Think about how a 100 kilogramme block would move.

beginning speed (Vi) = 0 m/s

a stands for speed.

d=displacement=1 m

Time taken is t = 0.53 seconds.

Using the formula:

d=Vi t+(0.5)a t2

1 = (0) (0.53) + (0.5) a (0.53) (0.53)

2

a = 7.12 m/s2

Acceleration for an at wood machine is expressed as

7.12 = (100 - m) (9.8)/ (100 + m)

m = 15.84 kg

m = 16 kg

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Answer: The author uses metaphors to explain how childeren taking on certain traits by (put what story is about here). The effect is that (put what happened at the end of story here).

Explanation:

The limiting frictional force is 50 N.

Frictional force is the force that opposes motion. The frictional force acts in a direction that is opposite to the force moving the body forward.

The weight of the object is given by;

W = mg

W = 10 Kg × 10 ms-2 = 100 N

Now;

Recall that;

μ = F/R

μ = coefficient of friction

F = limiting frictional force

R = reaction force

Reaction = weight = 100 N

0.5 = F/100 N

F = 0.5 × 100 N

F= 50 N

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Answer:

it is going down down down down the hill it goes so the roller coaster will then be down to a 0 m

Answer:

Electromagnetic waves have crests and troughs similar to those of ocean waves. The distance between crests is the wavelength. The shortest wavelengths are just fractions of the size of an atom, while the longest wavelengths scientists currently study can be larger than the diameter of our planet!

Explanation:

hope it's helps u ...........!

Answer:

It is C the kelvin scale

Explanation:

Have a great day

Answer:

Only about 12%–30% of the energy from the fuel you put in a conventional vehicle is used to move it down the road, depending on the drive cycle. The rest of the energy is lost to engine and driveline inefficiencies or used to power accessories. Therefore, the potential to improve fuel efficiency with advanced technologies is enormous.

Answer:

Because if we do nothing the artic will melt, ocean levels will rise and cause flooding, the earth will be extremely hotter, there will be more blackouts.

Explanation:

The example that is NOT an example of Simple Harmonic Motion is:

A ball rolling down a hill.

Simple Harmonic Motion is a type of periodic motion where the restoring force is proportional to the displacement from equilibrium and is directed towards the equilibrium point. The classic example of simple harmonic motion is the motion of a mass attached to a spring that is oscillating back and forth. Other examples of simple harmonic motion include a pendulum swinging back and forth and the vibration of a guitar string.

A ball rolling down a hill does not exhibit simple harmonic motion because it does not have a restoring force that is proportional to the displacement from equilibrium. The motion of the ball is affected by the force of gravity, which is not directed towards the equilibrium point, and the frictional force between the ball and the surface of the hill, which is not proportional to the displacement from equilibrium. Therefore, it is not an example of simple harmonic motion.

If an alumina fiber reinforced magnesium composite the composite stress at the matrix yield strain is 153 MPa.

To calculate the composite stress at the matrix yield strain, we need to use the rule of mixtures, which assumes that the composite behaves as a homogeneous material with properties that are a weighted average of the individual constituents. The composite stress can be calculated using the following formula:

σc = (1-Vf)σm + Vfσf

Where:
- σc is the composite stress
- Vf is the volume fraction of fiber
- σm is the matrix stress at yield
- σf is the fiber stress at yield

First, we need to calculate the fiber stress at yield. We can assume that the fiber remains elastic and does not yield. Therefore, the fiber stress at yield is equal to its maximum yield stress, which we do not have in this question. However, we can assume a typical maximum yield stress for alumina fibers of around 3 GPa.

σf = 3 GPa

Now, we can calculate the composite stress at the matrix yield strain:

σc = (1-0.5) x 180 MPa + 0.5 x 3 GPa
σc = 90 MPa + 1.5 GPa
σc = 153 MPa

Therefore, the composite stress at the matrix yield strain is 153 MPa.

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Answer:

Hetefrozygous, homofzygous

The main difference between Kinetic energy and Potential energy is that kinetic energy refers to movement while potential energy refers to storage.

Kinetic energy is a type of energy in motion or energy in movement such as a turbine (mechanical energy), while Potential energy refers to the energy that is stored to be used when required (e.g. chemical bonds of foods).

Therefore, with this data, we can see that  Kinetic energy is used as movement, while Potential energy is stored to be used in the future.

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Answer:

15mph

Explanation:

Because you've already done distance and time. Speed=distance divided by time. so it would be 300 divided by 20 giving you 15.

Answer:

C

Explanation:

Am increase in velocity?

Answer:

change in mass is not acceleration

Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 0.046 \times {15.5}^{2} \\ = 0.023 \times 240.25 \\ = 5.52575\)

We have the final answer as

Hope this helps you

the wave has a speed of 12 m/s.

Explanation:

Speed is directly proportional to wavelength and frequency. The wave has a frequency of 4 Hz. One Hertz (Hz) is equal to one cycle per second. The image shows that the wave has a wavelength of 3 m. Using the given speed and frequency, the wavelength can be calculated as shown below.

speed= wave length x frequency

speed = 3m x 4Hz

speed = 12m m/6

Kinetic energy is the kind of energy mentioned. The energy an object has as a result of its motion is known as kinetic energy.

Sound is a pressure density wave, whereas light is an electromagnetic wave. Sound must pass through a medium in order to be heard, but light does not. Sound energy is a continuous stream of energy on the scale while light energy is quantized into packets of energy called photons.

Sound is the longitudinal (compression or rarefaction) wave-based transfer of energy through materials. When a force causes an object or substance to vibrate, sound is created. That is to say, the substance serves as a conduit for the energy.

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The type of energy mentioned is kinetic energy. Kinetic energy is the energy that an object has as a result of motion.

Light is an electromagnetic wave, whereas sound is a pressure density wave. Light does not require a medium for transmission, but sound must. On the scale, sound energy flows continuously, whereas light energy is quantized into units of energy called photons.

The longitudinal wave-based transport of energy through materials is known as sound. Sound is produced when a force causes an item or substance to vibrate. In other words, the substance acts as a conduit.

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____________ energy the energy of motion, observable as the movement of an object or subatomic particle. Every moving object and particle have this energy. A person walking, a soaring baseball, a crumb falling from a table and a charged particle in an electric field are all examples of this energy at work.

What type of energy is described above? A. sound energy B. light energy C. heat energy D. kinetic energy

Answer:

the greater the half life is the slower the rate of decay will be.

Explanation:

half life of a radioactive substance is inversely proportional to the radioactive decay.

Answer:

B. The greater the half life is, the slower the rate of decay will be

Explanation: Most living things contain carbon-14, an unstable isotope of carbon that has a half-life of around 5,000 years. That means that when scientists dig up fossil bones, they can figure out how old they are by measuring the amount of carbon-14 remaining in the bones.

The height of the building is 8 meters. to calculate the height, we can use the equation for free fall:

\(v^2 = u^2 + 2as,\)

where v is the final velocity (4 m/s), u is the initial velocity (0 m/s), a is the acceleration due to gravity (-10 m/s^2), and s is the distance or height.

Rearranging the equation, we get:

\(s = (v^2 - u^2) / (2a)\)

Substituting the given values, we have:

\(s = (4^2 - 0^2) / (2 * -10) = 16 / -20 = -0.8 meters.\)

Since the height cannot be negative, we take the absolute value:

|\(s| = 0.8 meters.\)

Therefore, the height of the building is approximately 0.8 meters or 8 meters.

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Answer:

a teeter-toter, a car jack and a crowbar

Metals have shiny apperances