How many calories are needed to melt 50 grams of ice at 0°C and convert it to liquid water at 35°C?

Two things that keep windows from shattering are the strength of the glass and the ability of the window frame to dampen vibrations.

The strength of the glass is important because it determines how much force the glass can withstand before it breaks. Modern windows are typically made of tempered glass, which is treated with heat to make it stronger and more resistant to shattering.

The ability of the window frame to dampen vibrations is also crucial because glass is prone to resonance, which is a phenomenon that occurs when an object is subjected to vibration at its natural frequency.

If the frequency of the vibration matches the natural frequency of the glass, the glass can begin to vibrate and eventually shatter. To prevent this, window frames are designed to be sturdy and to dampen vibrations, which helps to prevent the glass from vibrating and shattering.

In summary, both the strength of the glass and the ability of the window frame to dampen vibrations are important factors that help to prevent windows from shattering.

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Answer:

W = 1014 J = 1.014 KJ

Explanation:

As, Sam has to stop the boats in the log ride. Therefore, the work Sam needs to do, in order to stop a boat must be equal to the kinetic energy of the boat:

Work Done by Sam = Kinetic Energy of the Boat

W = K.E

W = (1/2)mv²

where,

m = mass of boat and its rider = 1200 kg

v = speed of the boat = 1.3 m/s

Therefore,

W = (1/2)(1200 kg)(1.3 m/s)²

W = 1014 J = 1.014 KJ

Answer:

(a) The resistance of 25m of wire is 3 ohms

(b) the length of this wire that has resistance 22 ohms is 183.33 m

Explanation:

Given;

resistivity of the wire, ρ = 0.12 ohms per meter

(a) The resistance of 25m of wire is calculated as follows;

\(R = \rho L\\\\R = 0.12 \ \frac{ohms}{m} \times 25\ m\\\\R = 3 \ ohms\)

(b) the length of this wire that has resistance 22 ohms is calculated as;

\(L = \frac{R}{\rho} \\\\L = \frac{22 \ ohms }{0.12 \ ohms/m} = 183.33 \ m\)

By separating actions that are motivated by obligation from those that are not, the first premise aids in the distinction between those actions that have moral value.

The first involves a salesman who, even though he is aware of the customer's inexperience, does not overcharge them because he does not want to risk damaging his reputation by being found out.

Because the salesman was not driven by a sense of obligation to treat the consumer fairly, Kant claims that this is not a moral issue.

The second claim is that "an action performed out of obligation has its moral significance not in the goal that it is intended to achieve.

Therefore, By separating actions that are motivated by obligation from those that are not, the first premise aids in the distinction between those actions that have moral value.

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Answer:

Yes

Explanation:

The total resistance of the circuit is 49 Ω. The current strength in the circuit, when connected to a voltage source of 56 V, is approximately 1.14 A.

To calculate the total resistance of the circuit, we need to determine the equivalent resistance of the resistors connected in a series.

Given:

R1 = 4 Ω

R2 = 30 Ω

R3 = 10 Ω

R4 = 5 Ω

Calculate the equivalent resistance (RT) of R1 and R2, as they are connected in series:

RT1-2 = R1 + R2

RT1-2 = 4 Ω + 30 Ω

RT1-2 = 34 Ω

Calculate the equivalent resistance (RTotal) of RT1-2 and R3, as they are connected in parallel:

1/RTotal = 1/RT1-2 + 1/R3

1/RTotal = 1/34 Ω + 1/10 Ω

1/RTotal = (10 + 34) / (34 * 10) Ω

1/RTotal = 44 / 340 Ω

1/RTotal ≈ 0.1294 Ω

RTotal ≈ 1 / 0.1294 Ω

RTotal ≈ 7.74 Ω

Calculate the equivalent resistance (RTotalCircuit) of RTotal and R4, as they are connected in series:

RTotalCircuit = RTotal + R4

RTotalCircuit = 7.74 Ω + 5 Ω

RTotalCircuit ≈ 12.74 Ω

Therefore, the total resistance of the circuit is approximately 12.74 Ω.

To determine the current strength (I) when connected to a voltage source of 56 V, we can use Ohm's Law:

I = V / RTotalCircuit

I = 56 V / 12.74 Ω

I ≈ 4.39 A

Therefore, the current strength in the circuit, when connected to a voltage source of 56 V, is approximately 4.39 A (or 1.14 A, considering significant figures).

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Answer:

The warm seas create a large humid air mass. The warm air rises and forms a low pressure cell, known as a tropical depression.

Explanation:

Hurricanes arise in the tropical latitudes (between 10 degrees and 25 degrees N) in summer and autumn when sea surface temperature are 28 degrees C (82 degrees F) or higher.

Answer:

air

Explanation:

The average velocity of the car would be 24 kilometers per hour in the north direction if the car travels 48 kilometers in the north for 2 hours.

The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.

As given in the problem, we have to find the average velocity of the car if the car travels 48 kilometers in the north for 2 hours.

The average velocity of the car = 48 kilometers / 2 hours

                                                     = 24 kilometers per hour

Thus, the average velocity of the car would be 24 kilometers per hour

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The amount of work done on the toboggan by the tension force of 105 N with a rope directed 32° above the snow is 3.12 KJ

W = F d cos θ

W = Work done

F = Force

d = Distance

θ = Angle between force and displacement vector

d = 35 m

F = 105 N

θ = 32°

W = 105 * 35 * cos 35°

W = 105 * 35 * 0.85

W = 3123.75 N m

W = 3.12 KJ

Work done is energy transferred to make an object move to a distance. Its unit is Joules which is denoted as J. It is the amount of work done by a force of 1 Newton to move a distance of 1 meter.

Therefore, the amount of work done on the toboggan by the tension force is 3.12 KJ

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Answer:

c. Total energy

Explanation:

An "orbit" is a path for an object to follow. An example of an object is the "satellite."

At certain points in the orbit, the satellite increases its speed and decreases its speed in relation to the gravity caused by the Earth. As it moves farther away from the Earth, its speed slows down. So, this means that the kinetic energy changes. It also gains and loses height which is responsible for the changes occurring regarding potential energy. This is true for elliptical motion of satellites.

However, the total mechanical energy (TME) of the satellite remains the same or is unchanged (elliptical/circular).

Answer:

the glove could be heavy so slowing down his power

Explanation:

JUST GUESSED

The given statement about “Nuclear energy is a clean energy source with virtually no greenhouse gas emissions.” is true, because Nuclear is a zero-emission clean energy source.

Fission is the process by which atoms of uranium are separated to release energy, and this is how nuclear power plants produce electricity. Electricity is produced without the emission of hazardous pollutants often associated with the combustion of fossil fuels by using the heat released by fission to create steam that turns a turbine. The Nuclear Energy Institute (NEI) estimates that in 2020 the United States will have prevented the release of about 471 million metric tons of carbon dioxide. That's more than all other forms of clean energy put together, and it's the same as taking 100 million cars off the road. In addition to preventing acid rain, pollution, lung cancer, and cardiovascular illness, it also cleans the air by thousands of tons annually.

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The minimum velocity for the meteorite before entrance into earth's atmosphere is 36.8 m/s.

To calculate the minimum velocity the meteorite must have had before it entered Earth's atmosphere, the equation for heat transfer is:

Q = mcΔT

Where Q = the heat transferred,

m = the mass of the meteorite,

c = the specific heat capacity of iron, and

ΔT = the change in temperature.

The specific heat capacity of iron is approximately = 0.45 J/g°C.

Temperature of the meteorite changes from -105°C to the melting point of iron, which is approximately = 1535°C.

So: Q = mc(1535 - (-105))

Mass of the meteorite unknown, but we know it is made of iron, so assume a value for the mass, such as 100 g.

Q = 100 x 0.45(1535 - (-105))

Solving for Q:

Q = 67875 J

To calculate the kinetic energy of the meteorite, which is given by the equation: Ek = 1/2mv²

where Ek is kinetic energy,

m = the mass of the meteorite and

v = the velocity of the meteorite.

Therefore, the velocity of the meteorite is given by the following equation: v = √(2Ek/m)

Substituting the values of Ek and m, we get

v = √(2 x 67875/100)

Solving for v:

v = √1357.5

The minimum velocity the meteorite must have had before it entered Earth's atmosphere is approximately 36.8 m/s.

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Explanation

Step 1

Diagram:

Step 2

the work done by an object is defined as:

the product of the displacement of an object and the component of the applied force which is in the direction of the object's displacement:

so,let

therefore,l to reduce the amount of force needed , we need to affect the distnace or the angle

Step 3

let's check every option

A)Make the ramp higher.

as the distnace becomes greater the force must increase too, so this is not the rigth option,in other words , a higher distnace will neeed a stronger force

B)making the ramp longer will make the angle becomes smaller, and this makes the distance becomes greater,

C) when yuo make the ramp shorter ,you will need the same force because the displacementis vertical

when the angle becomes smaller, the work will be the same, but the distnace and force, change, cos

when the angle goes to 0° degrees the required force becomes smaller, so

the answer is

b. Make the ramp longer.

D)finally, if yuo lift the object witouth the ramp ( vertically) , the distnace becomes smaller, ( only 3 m),but the force is the total weigth of the object ( 300 N)

I hope this helps you

Answer:

Noether's theorem or Noether's first theorem states that every differentiable symmetry of the action of a physical system with conservative forces has a corresponding conservation law. The theorem was proven by mathematician Emmy Noether in 1915 and published in 1918.

The range of capacitance values that are needed so the antenna can pick up all the radio waves broadcasted by FM stations is from 5.45 x 10⁻¹² H to 3.62 x 10⁻¹² H.

The frequency at which the antenna can pick the radio waves broadcasted is known as resonance frequency.

At resonance frequency, the capacitive reactance is equal to inductive reactance.

Xc = Xl

\(\frac{1}{2\pi fC} = 2\pi fL\\\\4\pi^2 f^2 LC = 1\\\\C = \frac{1}{4\pi^2 f^2L}\)

where;

When the frequency is 88 MHz, the capacitance is;

\(C = \frac{1}{4\pi^2 \times (88 \times 10^6)^2 \times (6\times 10^{-7})} \\\\C = 5.45 \times 10^{-12} \ H\\\\\)

When the frequency is108 MHz, the capacitance is;

\(C = \frac{1}{4\pi^2 \times (108 \times 10^6)^2 \times (6\times 10^{-7})} \\\\C = 3.62\times 10^{-12} \ H\\\\\)

Thus, the range of capacitance values that are needed so the antenna can pick up all the radio waves broadcasted by FM stations is from 5.45 x 10⁻¹² H to 3.62 x 10⁻¹² H.

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The answer by onyebuchinnaji is correct, except for the fact that the final answer is in Farad (F), not H.

The change in internal energy, ΔE(AB) is 7.14 kJ.

Since, the ideal gas goes through a cycle of processes, the total change in internal energy will be zero.

ΔE = ΔE(AB) + ΔE(BC) + ΔE(CD) + ΔE(DA) = 0

So,

ΔE(AB) = -ΔE(BC) - ΔE(CD) - ΔE(DA)

​

We know that the process CD s an isothermal process.

So, the change in internal energy, ΔE(CD) = 0

According to the first law of thermodynamics,

ΔE = Q + W

Therefore, the change in internal energy,

ΔE(AB) = -[Q(BC) + W(BC)] - [Q(DA) + W(DA)]

ΔE(AB) = -[Q(BC) + P(B)ΔV(BC)] - [Q(DA) - P(D)ΔV(DA)]

ΔE(AB) = -(100 + 0.31 x3) - (-150 - 1 x -1)

ΔE(AB) = -100 - 0.93 + 150 + 1

ΔE(AB) = 50 + (0.07 x 1.013 x 10⁵)

ΔE(AB) = 50 + 7091

ΔE(AB) = 7.14 kJ

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Answer:

\(3.52\times 10^{25}\ \text{J}\)

Explanation:

G = Gravitational constant = \(6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^2\)

M = Mass of Sun = \(1.989\times 10^{30}\ \text{kg}\)

m = Mass of Earth = \(5.972\times 10^{24}\ \text{kg}\)

\(r_i\) = Initial radius of orbit = \(1.5\times 10^{11}\ \text{m}\)

\(r_f\) = Final radius of orbit = \(((1.5\times 10^{11})+2\times 10^3)\ \text{m}\)

Energy required is given by

\(E=\dfrac{1}{2}\Delta U\\\Rightarrow E=\dfrac{GMm}{2}(\dfrac{1}{r_i}-\dfrac{1}{r_f})\\\Rightarrow E=\dfrac{6.674\times 10^{-11}\times 1.989\times 10^{30}\times 5.972\times 10^{24}}{2}(\dfrac{1}{1.5\times 10^{11}}-\dfrac{1}{(1.5\times 10^{11})+2\times 10^3})\\\Rightarrow E=3.52\times 10^{25}\ \text{J}\)

The energy required would be \(3.52\times 10^{25}\ \text{J}\).

There are  44180640 seconds in 1.40 year .

365 or 366 days, divided into 12 months or 52 weeks, make up the time from 1 January to 31 December, or a year.

1 year equals to 365.25 days

1.40 years equal to (1.40 × 365.25 days)

= 511.35 days.

1 day equals to 24 hours.

1 hour equals to 60 minute.

1 day equals to (24 × 60 × 60) second = 86400 seconds.

511.35 days equals to (511.35 ×  86400 seconds) = 44180640 seconds

So, 1.40 years equal to 44180640 seconds.

Hence, There are  44180640 seconds in 1.40yr .

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Answer:

The torque on the child is now the same, τ.

Explanation:

       \(I_{to} = I_{d} + m*r^{2} = m*\frac{r^{2}}{2} + m*r^{2} = \frac{3}{2}* m*r^{2} (1)\)

       \(I_{t} = I_{d} + m*\frac{r^{2}}{4} = m*\frac{r^{2}}{2} + m*\frac{r^{2}}{4} = \frac{3}{4}* m*r^{2} (3)\)

       τ = 3/4*m*r² * (2α) = 3/2*m*r²

        same result than in (2), so the torque remains the same.

The temperature gradient in the flow of direction is 294525 W.

A temperature gradient is the gradual variance in temperature with distance. The slope of the gradient is consistent within a material. A gradient is established anytime two materials at different temperatures are in physical contact with each other.

Q= T/( L/ KA)

Q= ( 1500 − 450) / 0.15 / 9.35v * 4.35)

   = 294525 W

Units of measure of temperature gradients are degrees per unit distance, such as °F per inch or °C per meter.

Many temperature gradients exist naturally, while others are created. The largest temperature gradient on Earth is the Earth itself. Q= T/Ka.

Therefore, The temperature gradient in the flow of direction is 294525 W.

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Answer: I am pretty sure it is (b) what is the value of mass suspended at the end of the spring.

Explanation:

If the universe were to suddenly begin shrinking rather than continuing to expand, it would have a significant effect on the cosmic microwave background radiation (CMB).

The CMB is the afterglow of the Big Bang and is observed as a nearly uniform background radiation in all directions. It is thought to have been emitted when the universe was about 380,000 years old and had cooled enough for neutral atoms to form.

If the universe were to suddenly begin shrinking, the photons in the CMB would lose energy as they travel through the contracting space. This would cause the CMB radiation to shift to shorter wavelengths, which is known as blue-shifting.

Therefore, the correct answer is B. It would blue-shift.

On the runway, aeroplanes accelerate between 115 and 160 mph (ca. 257 km/h). However, the precise acceleration is influenced by the plane's model, the weather, and other elements.

Seat belts will definitely feel under strain, and loose objects will become displaced. Considerable, sudden changes in height, attitude, and typically, large variations in indicated airspeed are all symptoms of severe turbulence. There's a chance the jet will briefly lose control.

Therefore, In general, tiny planes need the least amount of acceleration to take off, whereas commercial planes need the greatest.

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A large tank is filled with water to a depth of 38 m. If an opening is located 13 m above the bottom of the tank. then the water will emerge at a speed of 22.14 m/s.

The total applied force per unit of area is known as the pressure.

The pressure depends both on externally applied force as well the area on which it is applied.

As given in the problem A large tank is filled with water to a depth of 38 m. An opening is located 13 m above the bottom of the tank.

Velocity head available = 38-13

                                        =25 meters

The speed of the water from the opening = √2gΔH

                                                                     = √2×9.81×25

The speed of the water from the opening = 22.14 m/s

Thus, water will emerge at a speed of 22.14 m/s.

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Goal posts at the end of football field are padded as a safety measure to players who might run into them,these thick paddings of the goal posts are done to prevent injuries to the players because the padding of the goal post increases the time of impact and this in-turn decreases the force on the the players body or the force it will have when a player's body hit against it and therefore decreasing the force applied to bring the player to a stop.

We can also say that it increases the time of collision between the player's body and the post.

Speed is defined as a change in position over time. Position's derivative is velocity, and velocity's derivative is acceleration.

                             S = d/t

                               v = v 0 + a t

                          v = s/t

                      a = (v - v0) / t = Δv / t

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