Which simple machine makes work easier by converting a small force exerted over a large distance into a larger force over a smaller distance?.

Answer:

Pluto because is the farest away from the sun

The work done by the friction on the refrigerator when the car drags it across the 10-meter yard is 3.499 kJ.

Work done equals the product of force and displacement. It defines the energy transferred to the system by the means of force. Work done = force × displacement. When the body is in motion, it experiences a frictional force. The frictional force is the product of normal force and the coefficient of kinetic friction(μk).

From the given,

mass of the refrigerator (m) = 140kg

distance travelled d = 10m

co-efficient of kinetic friction (μk) = 0.25

form an angle θ = 25°

Force = (μk) × Fₙ   (Fₙ represents the normal force )

Fₙ = m×g = 140 × 10 = 1400 N ( g represents acceleration due to gravity)

Force = (μk) × Fₙ

         =  0.25 × 1400

         = 350 N

Force F = 350 N

The work done,

W = F×d

   = F×d×cosθ

   = 350×10×(cos(25°))

   =  3.499kJ

Thus, the work done by friction is W = 3.499kJ.

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Answer:

i dont know but what i could say is you could go on  and ask the question and it would help you

Explanation:

Answer:

709.5 cal

Explanation:

masa m de la barra de aluminio = 100 g

temperatura ambiente = 27 ° C

Asumiremos que la barra de aluminio está en equilibrio térmico con el ambiente.

Esto significa que la temperatura inicial de la barra es de 27 ° C

temperatura final a la que la barra debe calentarse = 60 ° C

el aumento de temperatura ΔT será

ΔT = 60 ° C - 27 ° C = 33 ° C

capacidad calorífica específica c del aluminio = 0.215 cal/g°C

Calor C requerido = mcΔT

C = 100 x 0.215 x 33 = 709.5 cal

Answer:

volume is not a property of air

Answer:

The orbital speeds of stars far from the galactic center are surprisingly high, suggesting that these stars are feeling gravitational effects from unseen matter in the halo.

That's pretty simple, we have;

We know that;

And..

Put all the values;

Therefore, the total time taken will be 92.85 sec.

a) The acceptance of a particular scientific theory is determined by scientists who work in that field of study: This statement is generally true.

b) The general public determines which scientific theories are acceptable: This statement is not entirely accurate.

c)  When published, scientific theories are accepted completely by all: This statement is false.

a.) The acceptance of a particular scientific theory is determined by scientists who work in that field of study: This statement is generally true. Scientists play a crucial role in evaluating and accepting scientific theories. They critically analyze the evidence, conduct experiments, peer-review research papers, and engage in scientific discourse to assess the validity and credibility of theories. The scientific community relies on the expertise and consensus among scientists to determine the acceptance of a theory.

b.) The general public determines which scientific theories are acceptable: This statement is not entirely accurate. While public opinion and perception can influence the visibility and popularity of scientific theories, acceptance within the scientific community is primarily based on rigorous scientific evidence and expert evaluation. The general public may have varying levels of understanding and knowledge in specific scientific fields, which can impact their acceptance or rejection of certain theories. However, scientific consensus is typically based on the collective judgment of experts in the field rather than public opinion alone.

c.) When published, scientific theories are accepted completely by all: This statement is false. Scientific theories are not automatically accepted completely by all when published. The publication of scientific theories marks an important step in the scientific process, allowing researchers to share their findings and ideas with the scientific community. However, acceptance of a theory requires rigorous scrutiny, replication of results, further experimentation, and critical evaluation by other scientists in the field. Scientific theories are subject to ongoing refinement, revision, and even rejection based on new evidence and advances in knowledge. The process of scientific inquiry involves continuous questioning, testing, and refining of theories to ensure the most accurate understanding of the natural world.

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Answer:

Because even if iron is magnetic its not a magnet it self unless rubbed a magnetic object

The specific heat capacity formula is used to determine the quantity of heat required to alter the temperature of a unit mass of a substance by one degree Celsius.

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Answer:

Energy conversion, also termed as energy transformation, is the process of changing one form of energy into another. Energy conversion occurs everywhere and every minute of the day. There are numerous forms of energy like thermal energy, electrical energy, nuclear energy, electromagnetic energy, mechanical energy, chemical energy, sound energy, etc. On the other hand, the term Energy Transformation is used when energy changes forms from one form to another. Whether the                                                                    energy is transferred or transformed, the total amount of energy doesn’t change and this is known as the Law of Conservation of Energy.

Explanation:

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Answer:

saddle weighs 250 newtons. The mass of the saddle is ____250/9.8 kg______ kilograms. Use g = 9.8 N/kg for gravity.

Answer:

A bricklaying job

Explanation:

To start with an acute strain is a type of inury that occurs when heavy objects are improperly lifted an individual in ways that the person's muscles becomes overstressed.

There are a number of jobs that are likely to cause acute strain including bricklaying jobs. People engaged in bricklaying jobs tend to improperly lift heavy objects, an activity that leads to repititive and prolonged overuse of muscles and tendons which is known as acute strain.

Another example of a job that can lead to acute strain is furniture moving.

Answer:

I completely agree with the first person's response.

Explanation:

They deserve Brainliest. Have a great summer.

The choice that correctly pairs a scientist with their work on atoms and elements is Thompson-the plum pudding model

Dalton's work on atoms and elements is called the atomic theory of matter. The quantum theory of the atom was proposed by Erwin Schrödinger. Bohr's work on atoms and elements is called planetary model / Bohr's atomic model. The uncertainty of particles in an atom is the work of Werner Heisenberg. Rutherford's work on atoms and elements is called Rutherford model of the atom or Rutherford atomic model.

The plum pudding model was the atomic model of J J Thomson. It was proposed in 1900. It explains the inner structure of the atom. He also discovered electrons during a cathode ray tube experiment in 1897.

Therefore, the choice that correctly pairs a scientist with their work on atoms and elements is Thompson-the plum pudding model

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Newton's Law of Cooling is a simplification based on the assumption that the rate of energy flow is proportionate to the temperature difference.

Radiative energy flow becomes essential at very high temperature differences, and this is proportional to the difference in temperatures raised to the fourth power.

Its capacitance Double the charge and double the plate area.

Doubling the distance between the plates of a capacitor double the capacitance. Doubling the distance between the plates of a capacitor quadruples the capacitance. As the distance between the plates decreases, the capacitance increases because the potential difference decreases.

Halving the distance between the plates of a parallel plate capacitor doubles the capacitance of the capacitor from its initial capacitance. When two or more capacitors are connected in parallel, the overall effect is that of a single equivalent capacitor with the sum of the plate areas of the individual capacitors. As we saw earlier all other factors being equal, more disk space equals more capacity.

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Answer:

Actually it is linear motion but here option is not given so the best option is translators motion.

Explanation:

Hope it will help you :)

Answer:

d rotatory motion

Explanation:

Answer: 90Kg

Explanation:

The mass of air hitting the sail each second can be calculated as:

mass of air = density of air * volume of air

The volume of air hitting the sail can be calculated as:

volume of air = area of sail * velocity of wind * time

Here, the area of sail is given as 3.8 m², the velocity of wind is 20 ms^-1, and the time is 1 second (since we want to calculate the mass of air hitting the sail each second).

Therefore,

volume of air = 3.8 m² * 20 ms^-1 * 1 s = 76 m³

Using the given density of air of 1.2 kg m^-3, we can calculate the mass of air hitting the sail each second as:

mass of air = 1.2 kg m^-3 * 76 m³ = 91.2 kg

Therefore, the mass of air hitting the sail each second is approximately 90 kg.

one Mpc is equal to about 3.26 x 10^6 x 9.46 x 10^12 km, or about 3.09 x 10^19 km.

The number of seconds per year is approximately 3.15 x 10^7 sec/yr.

:In order to calculate the age of the universe, we need to know the value of H and use it to calculate the Hubble time, which is the time it would take for the universe to expand to its current size given the current rate of expansion. This can be calculated using the formula t = 1/H,

where t is the Hubble time and H is the Hubble constant (RV/D).

Once we know the Hubble time, we can use it to calculate the age of the universe, which is simply the Hubble time multiplied by a correction factor (which accounts for the fact that the universe has been expanding at a slower rate in the past). The current best estimate for the age of the universe is about 13.8 billion years.

To calculate the age of the universe, we need to know the value of the Hubble constant (H), which is the rate at which the universe is expanding. We also need to know the number of seconds per year and the number of kilometers per Mpc, which can be calculated from other astronomical measurements.

The number of seconds per year is approximately 3.15 x 10^7 sec/yr.

This value is derived from the fact that one year is equal to the time it takes for the Earth to orbit the Sun once, and the length of that time is about 365.25 days, or 31,557,600 seconds.

The number of kilometers per Mpc is approximately 3.09 x 10^19 km/Mpc. This value is derived from the fact that one Mpc (megaparsec) is equal to about 3.26 million light years, and the speed of light is about 300,000 kilometers per second.

Therefore, one Mpc is equal to about 3.26 x 10^6 x 9.46 x 10^12 km, or about 3.09 x 10^19 km.

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Answer:

option (c).

Explanation:

A thermodynamical system is the system in which the system is closed and the volume is constant.

Here, the glass container which is sealed is the best example of thermodynamical closed system.

Given:

The mass of the car is: m = 873 kg

The initial speed of the car is: vi = 0 m/s (as initially, the car is at rest)

The final speed of the car is: vf = 35 m/s

The time over which the speed of car increases is: t = 5 s

To find:

The force exerted on the car.

Explanation:

The acceleration of the car can be calculated by using the following equation.

Here, a is the acceleration of the car.

Substituting the values in the above equation, we get:

The acceleration of the car is 7 m/s² in an eastward direction.

Now, using Newton's second law of motion, the force exerted on the car can be calculated as:

Substituting the values in the above equation, we get:

The force exerted on the car is 6.111 kN. The direction of force is the same as the direction of the car. Thus, the direction of the force is in an eastward direction.

Final answer:

The force exerted on the car is 6.111 Kilo-Newtons (kN) eastward.

Answer:

2970dB

Explanation:

30 x99=2970

Answer:  NOx and VOC combine chemically with oxygen to form ozone

Explanation:

The total distance the bird travels is 168 kilometers. Let’s start by using time to determine the distance that the two trains would travel before they meet.

Now let us think about the bird. Since the bird flies from the first train towards the second train and then back to the first train and so on, we can think of this as one complete round trip. For one round trip, the bird covers the distance between the two trains twice, which is 42 km each time. Therefore, the bird travels a total distance of 2 × 42 = 84 km for one round trip.

The two trains are now traveling together as one unit with a combined speed of 21 km/h. Therefore, the bird can just sit on top of the trains and not fly anymore! Therefore, the bird will travel a total distance of 84 km before the two trains meet, and then it will travel 84 km again with the trains after they meet. Therefore, the total distance the bird travels is:84 km + 84 km = 168 km.

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Answer:

Neil Armstrong was the astronaut