A 100 kg cart on a roller coaster has 1800J of kinetic energy. How fast is it going?
KE= 1/2mv2

The initial mass of the rocket will be 526.2 kg

As we know,

Final speed = 105 m/s

Time = 18.0 s

Exhaust initial speed = 1200 m/s

Mass of burned fuel = 150 kg

We need to calculate the initial mass Which would be 526.2 kg.

What do you mean by Initial and final mass?

The mass of an object at the starting point is known as initial mass while the mass which remains at the last is called Final mass. The Initial Mass Function (IMF) is usually expressed as a power law,

IMF = constant × m −α.

Hence, in the above case we have found the initial mass from the given formula.

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Answer:

the third one

Explanation:

she is using a card instead of paper

Answer & Explanation:

To solve this problem, we need to set the gravitational force acting on the bead equal to the electric force acting on it. The bead will hang suspended in the air when these two forces are equal.

The gravitational force \(\( F_g \)\) is given by:

\($$ F_g = m \cdot g $$\)

where \(\( m \)\) is the mass of the bead and \(\( g \)\) is the acceleration due to gravity.

The electric force \(\( F_e \)\) is given by:

\($$ F_e = q \cdot E $$\)

where \(\( q \)\) is the charge of the bead and \(\( E \)\) is the electric field strength.

Setting these two equal gives:

\($$ m \cdot g = q \cdot E $$\)

Solving for \(\( E \)\) gives:

\($$ E = \frac{m \cdot g}{q} $$\)

Given that the mass \(\( m \)\) of the bead is 0.10 g (or 0.10/1000 kg), the acceleration due to gravity \(\( g \)\) is approximately 9.8 m/s², and the charge \(\( q \)\) is the charge of \(1.0 x 10^10\) electrons (with the charge of one electron being approximately \(\( 1.6 \times 10^{-19} \) C)\), we can substitute these values into the formula to find the electric field strength. Let's calculate that.

The electric field strength that will cause the bead to hang suspended in the air is approximately \(\(6.13 \times 10^5\)\) N/C (Newtons per Coulomb).

The magnitude of the average force needed to hold onto the child is ________ N. Based on this result, the man's claim may or may not be valid. This problem highlights the importance of proper safety devices such as seat belts and special toddler seats.

In order to determine the magnitude of the average force needed to hold onto the child, we need to consider the physical factors at play. The force required to hold onto an object can be calculated using Newton's second law of motion, which states that force (F) is equal to the mass (m) of the object multiplied by its acceleration (a). In this case, the mass of the child is the relevant factor.

To find the magnitude of the average force, we first need to know the mass of the child. Let's assume the mass is given as m kg. The acceleration in this scenario would be the acceleration due to gravity, which is approximately 9.8 m/s^2. Therefore, the force needed to hold onto the child can be calculated using the equation F = m * a.

Now, let's calculate the force needed. F = m * 9.8 N/kg. Substitute the value of the child's mass (m) into this equation, and you will find the magnitude of the average force required to hold onto the child in newtons.

Based on the result obtained, we can assess the validity of the man's claim. If the calculated force is within a range that an average person can exert, the man's claim of being able to hold onto the child may be valid. However, if the force required exceeds what an average person can sustain, the man's claim may not be valid.

This problem underscores the importance of using proper safety devices such as seat belts and special toddler seats. Even if someone claims they can physically hold onto a child, it may not be feasible or safe to rely solely on their grip strength. Safety devices are designed to distribute forces evenly and provide additional protection in case of unexpected events, ensuring the safety of both the child and the person responsible for their care.

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Electromagnetic force is the force that moving, charged particles exert on one another.

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Organelles are small structures present inside the cell body in order to regulate the various functions of cell .

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Answer:

electric field must not exceed 5000 V / m  ( 5 kV/m)

Explanation:

All electrical equipment produces electric and magnetic fields that must be within the range recommended by WHO, the upper limit for the sum of all fields is

  The electric field must not exceed 5000 V / m

to get an idea of ​​the intensity produced by one of the devices that has the largest electric field in the radio with 180 V / m

Answer

Answer:

fdsbgdfshtrsnbfgsbnhgr

Explanation:

cdfrgresgtrshtrwhtrwhtwjhdgngdabfeahydrtgnb

The type of light that best illustrates the photoelectric effect is (c) ultraviolet light. Hence, the correct answer is option c).

Photoelectric effect refers to the emission of electrons from a metallic surface when a light of suitable frequency shines on the surface of the metal. The phenomenon, first noticed by Heinrich Hertz in 1887, was explained in 1905 by Albert Einstein when he used Planck's hypothesis to illustrate that light energy is carried in discrete quantized packets to describe the photoelectric effect.

In relation to photoelectric effect, the type of light that best illustrates it is ultraviolet light. This is because ultraviolet light has a high enough frequency to remove electrons from the metal surface. As a result, electrons that absorb photons with enough energy from the ultraviolet region of the electromagnetic spectrum will be ejected from the metal, causing the photoelectric effect, and producing an electric current.

When light is shone on a metallic surface, an electric current is produced, which is called the photoelectric effect. The photoelectric effect is caused by the emission of electrons from a metal surface that is exposed to a light of suitable frequency. The energy of the electrons depends on the frequency of the light, and the intensity of the light determines the number of electrons ejected from the surface.

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C. a decrease in energy.

When water vapor cools, its molecules lose energy, causing them to move closer together. As the molecules become more closely packed, they eventually form liquid water. This change in the state of matter is known as condensation.

When water vapor loses energy through cooling, its molecules become closer together and eventually form liquid water. This process is called condensation.

Therefore, the correct answer to the question is C. a decrease in energy.

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At the time of the summer solstice, the noontime altitude of the sun is at its highest point, around 90°.

Altitude is the height above sea level. It is typically measured in either metres or feet. In aviation, altitude can also refer to the vertical distance between an aircraft and a certain reference point on the ground. Altitude can be used to determine the air pressure, temperature, and density of the air. Altitude can also be used to calculate the distance a plane can travel without refueling. Altitude can play an important role in the weather of an area, as air pressure and temperature tend to decrease with altitude. Altitude can also affect the type of vegetation found in an area. In mountain regions, the altitude can have a dramatic effect on the climate, creating distinct areas of vegetation and wildlife. Altitude can also affect the types of crops that can be grown in an area, depending on the air pressure, temperature, and precipitation.

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Answer:

Is Mercury an answer on your thing?

Explanation:

Mercury has the least amount of gravity, so therefore you can jump the highest on Mercury.

Answer:

Jupiter

Explanation:

Jupiter has more than 300 time the mass as earth. so, it's gravitational pull is stronger.

Hopefully this helps

Answer:

true stick up for urself

Answer:

the correct answer is 3 meters

"Increase its voltage and decrease its current" results change to a circuit that is most likely to decrease its electrical power.The correct option is C

Electrical power is calculated as the product of voltage and current (P = V * I). By increasing the voltage and decreasing the current, the overall power of the circuit will decrease.

The explanation for why the other options are not true:

A. Increase its voltage and increase its current: Increasing both voltage and current would result in an increase in electrical power. This contradicts the requirement of decreasing the power mentioned in the question.

B. Decrease its voltage and decrease its current: Decreasing both voltage and current would also result in a decrease in electrical power. This contradicts the requirement of decreasing the power mentioned in the question.

D. Decrease its voltage and increase its current: Decreasing the voltage and increasing the current would not necessarily lead to a decrease in power. Depending on the specific values of voltage and current, the power could increase or decrease. Therefore, this option does not guarantee a decrease in electrical power.

Hence, the correct answer is option C.

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The peak emission wavelength for a campfire with this temperature is 2.32 µm.

Wein's Law is given by the formula: Amax = a/T

We have to find the peak emission wavelength of the campfire using Wein's displacement law which is given by the formula Amax = a/T.

Where Amax is the peak emission wavelength in um, a is a constant that equals 2897 um-K, and T is the blackbody temperature.

Substituting the given values in the formula, we get:

Amax = 2897 / 1250 um-K = 2.32 um

Therefore, 2.32 µm is the peak emission wavelength for a campfire with this temperature

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Answer:

The answer is C2H60 hope this helps.

Explanation:

When a 10 MeV gamma-ray undergoes pair production in a given volume V, it results in the creation of an electron and a positron, both having equal energies of approximately 10 MeV.

Given that a 10 MeV gamma-ray undergoes pair production in volume V, it results in the creation of an electron and a positron with equal energies.

Pair production is a phenomenon where a gamma-ray photon, which is a high-energy photon, interacts with an atomic nucleus or an electron and converts its energy into the mass of an electron-positron pair. This process requires a minimum threshold energy, typically around 1.02 MeV, to produce an electron-positron pair.

In this case, the 10 MeV gamma-ray exceeds the threshold energy required for pair production. As a result, the gamma ray disappears and is transformed into an electron and a positron, both having equal energies. The energy of each particle will be approximately 10 MeV, as the total energy of the gamma-ray is conserved in the process.

It's important to note that pair production requires an atomic nucleus or an electron to interact with the gamma ray. The volume V mentioned in the question could refer to the specific region or medium where this interaction occurs, such as a target material or a radiation detector.

Overall, when a 10 MeV gamma-ray undergoes pair production in a given volume V, it results in the creation of an electron and a positron, both having equal energies of approximately 10 MeV.

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In the event of an accident or a car crash, road safety barriers and fences prevent automobiles from running off the road.

Newton's Three Laws of Physics can help explain what these safety barriers are and how they help to save lives during car accidents :

I.  Unless acted upon by an imbalanced force, an object at rest will remain at rest, and an object at constant velocity will remain at constant velocity.

II.  If an imbalanced force occurs, a mass will experience acceleration proportional to its magnitude.

III.  When you apply a force to an object, you will feel a force that is equal    in magnitude but opposite in direction.

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b. False

When using accelerated depreciation, the present value of future cash flows does not increase. Accelerated depreciation methods, such as the double-declining balance or sum-of-the-years'-digits, allocate more depreciation expense in the early years of an asset's life, resulting in lower taxable income and tax savings in those years. However, the total amount of depreciation remains the same over the asset's useful life.

The present value of future cash flows is determined by discounting future cash flows to their present value using an appropriate discount rate. Accelerated depreciation methods do not directly impact the timing or magnitude of future cash flows, and therefore do not increase the present value of those cash flows.

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Explanation:

The inertia of a 4 kg mass is four times as great as a 1 kg mass.

-20 j is the change in internal energy.

When work is done and heat and light are produced, energy is the quantitative quality that is transferred to the body or to the physical system. The law of conservation of energy asserts that although energy can be changed in form, it cannot be created or destroyed. Energy is a conserved quantity. The definition of a joule, the SI unit used to measure energy, is "the energy imparted to an object by the work of moving it a distance of one metre against a force of one newton."

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a) The ratio of the power required for part b to the power required for part a is 2.14.

b) The minimum theoretical power required by the air conditioner is about 2.14 times the minimum theoretical power required by the air conditioner in part a.

a) Minimum theoretical power required by the air conditioner

The heat transfer rate for air conditioner, Qdot is given by:

Qdot = U A ΔT,

where U is the heat transfer coefficient,

           A is the surface area, and

          ΔT is the temperature difference across the wall.

Since the temperature difference across the wall for the inside is 28 - 21 = 7 ∘C, the temperature difference between the inside and the outside of the air conditioner is 7 ∘C.

The surface area of the air conditioner, A = 10 m²

The heat transfer coefficient, U = 5 W/m² K

Thus,

                 Qdot = U A ΔT

                          = 5 (10) (7)

                           = 350 W

                            = 0.35 kW

The minimum theoretical power required by the air conditioner is 0.35 kW.

b) Minimum theoretical power required when TC​=17C and TH​=32+C

The temperature difference across the wall is the difference between the inside and the outside temperature.

That is:

                ΔT = TH - TC

                      = 32 - 17

                      = 15 °C

The rate of heat transfer is given by:

          Qdot = U A ΔT

The temperature difference between the inside and the wall of the air conditioner, ΔT1 = 7°C

The temperature difference between the wall of the air conditioner and the outside,

             ΔT2 = 15 - 7

                    = 8°C

The rate of heat transfer between the inside and the wall of the air conditioner:

                   Qdot1 = U A ΔT1

                              = 5 (10) (7)

                              = 350 W

The rate of heat transfer between the wall of the air conditioner and the outside:

              Qdot2 = U A ΔT2

                         = 5 (10) (8)

                          = 400 W

The total rate of heat transfer,

                           Qdot = Qdot1 + Qdot2

                                    = 350 + 400

                                     = 750 W

The minimum theoretical power required by the air conditioner is 0.75 kW.

The ratio of the power for part (b) to the power for part (a) is:

                         Pb / Pa = 0.75 / 0.35

                                    = 2.14

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Answer:

Efficiency = 80%

Explanation:

Given the following data;

Mechanical advantage (MA) = 4

Ideal mechanical advantage (IMA) = 5

To find the efficiency of the machine;

Mathematically, the efficiency of a machine is given by the formula;

\( Efficiency = \frac {MA}{IMA} * 100 \)

Substituting into the formula, we have;

\( Efficiency = \frac {4}{5} * 100 \)

\( Efficiency = 0.8 * 100 \)

Efficiency = 80%

Hubble's law requires the measurement of two properties of a galaxy: distance and recessional velocity.

Distance is important because it determines how far away a galaxy is from us, and this is necessary in order to calculate its recessional velocity. Recessional velocity is the speed at which a galaxy is moving away from us due to the expansion of the universe.

By measuring the recessional velocity of a galaxy, astronomers can determine its distance from us and how fast it is moving away. This information is essential in understanding the structure and evolution of the universe.

Therefore, the correct answer is option (c) distance; recessional velocity.

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Answer:

273,000 Astronomical Units.

Explanation:

4.3 light years = 40,850,000,000,000 kilometeres, 4.3 x 9,500,000,000,000.

Convert kilometers to astronomical unit:

149,597,870 kilometers = 1 AU, convert unit.

40,850,000,000,000 divided by 149,597,870 = 273,065.385222 or approx. 273,000 AU.