TIME REMAINING 54:08 If a cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, how will heat flow between them? from the hand to the cup from the cup to the hand from the cup to the surrounding air from the hand to surrounding air

Answer:

13

Explanation:

Answer:

Biodiesel is considered a renewable energy source because it is made with animal fat

Explanation:

Biodiesel is a fuel generated from animal fats, vegetable fats, using a catalyst for chemical formulation of biodisel.

It is a renewable source of fuel, as it can be replenished (renewed) easily & in shorter time, since it is made of animal fats & vegetable fats. Unlike non renewable fuels which take long periods to replenish (renew), like fossil fuels.

So, Biodiesel is considered a renewable energy source because it is made with animal fat

Answer: D

Explanation: Took the test

Announcement 1: Fluid mechanics is a branch of chemistry that involves having a look at fluids:  c) False, True

Fluid mechanics is the branch of physics concerned with the mechanics of fluids and the forces on them. It has programs in an extensive variety of disciplines, such as mechanical, aerospace, civil, chemical, and biomedical engineering, geophysics, oceanography, meteorology, astrophysics, and biology. Fluid mechanics is the look at of the forces of the fluid and the way fluids flow. Fluid mechanics may be divided into parts: fluid statics and fluid dynamics. Fluid statics is the observation of fluids at rest, and fluid dynamics is the study of fluids in motion.

Fluid mechanics is the look at fluid behavior (beverages, gases, blood, and plasmas) at relaxation and in movement. Fluid mechanics has a huge variety of packages in mechanical and chemical engineering, organic structures, and in astrophysics.

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Answer:

Distance

Explanation:

Distance is the base quantity (measured in lengths) while speed, Area and Force are all derived quantities derived from base quantities.

Given:

Resistance of hair dryer, R1= 12.0 Ohms

Resistance of lamp, R2 = 125 ohms

Voltage of source = 125 V

Resistance = 1.50 ohms

Let's find the curent through the lamp when the hair dryer is on.

Here, the lamp and dryer are connected in parralel. To calculate the equivalent resistance, apply the formula:

Now, the Rp and the resistor are connected in series.

To find the equivalent resistance in series, we have:

We now have a single resistor flowing through the 125 voltage source.

To find the current, apply Ohm's law:

Solve for the current (I), where:

V = 125 volts

R = 12.4 Ω

Thus, we have:

Since the resistor and Rp are connected in series, we have:

Since the dryer and the lamp are in parallel, the voltage through them are the same.

V(dryer) = V(lamp) = 110.1 Volts

To find the current flowing through the lamp, we have:

Therefore, the current through the lamp when the hair dryer is on is 0.880 ampere.

ANSWER:

1) 0.880 A

The amplitude of the induced EMF in a generator with a square coil of 300 turns, side length 45 cm, magnetic field magnitude 0.80 T, and frequency 60.0 Hz is 30.24 V.


1. Calculate the area of the square coil: A = side^2 = (0.45 m)^2 = 0.2025 m^2
2. Calculate the angular frequency: ω = 2πf = 2π(60 Hz) = 376.99 rad/s
3. Use Faraday's Law to calculate the induced EMF amplitude: |EMF| = NABωsin(ωt)
4. Since we're looking for the amplitude, we only need the maximum value, which occurs when sin(ωt) = 1.
5. Thus, |EMF|max = NABω = (300 turns)(0.2025 m^2)(0.80 T)(376.99 rad/s) = 30.24 V

The amplitude of the induced EMF is 30.24 volts.

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Answer: The answer is 222.8

The truck's acceleration can be determined using the formula a = (vf - vi)/t, where a is acceleration, vf is final velocity, vi is initial velocity, and t is time. The average force required for the truck to accelerate from 4.2 m/s to 7.8 m/s in 14 s is 661.5 N.

a = (7.8 m/s - 4.2 m/s) / 14 s = 0.21 m/s² The truck's mass is 3,150 kg. To calculate the average force required for the truck to accelerate under these conditions, we'll use Newton's second law of motion, which states that force is equal to mass times acceleration: F = ma = (3,150 kg)(0.21 m/s²)F = 661.5 N Therefore, The average force needed for the truck to accelerate under these conditions is 661.5 N. The average force needed for the truck to accelerate under these conditions is 661.5 N. To calculate the force, we used Newton's second law of motion, which states that force is equal to mass times acceleration. We first calculated the acceleration of the truck using the formula a = (vf - vi)/t, where a is acceleration, vf is final velocity, vi is initial velocity, and t is time. The truck's acceleration is 0.21 m/s². We then multiplied the acceleration by the truck's mass, which is 3,150 kg, to find the force required. The answer is 661.5 N.

The average force required for the truck to accelerate from 4.2 m/s to 7.8 m/s in 14 s is 661.5 N.

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A change in pressure will cause a corresponding change in the size of the air bubble trapped inside the test tube.

The relationship between pressure and volume of a gas is described by Boyle's Law, which states that at a constant temperature, the pressure and volume of a gas are inversely proportional. Mathematically, this can be expressed as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume of the gas, and P2 and V2 are the new pressure and volume of the gas, respectively.

Therefore, if the pressure inside the test tube increases, the volume of the air bubble trapped inside will decrease, and vice versa. For example, if the pressure inside the test tube doubles, the volume of the air bubble will be reduced to half of its initial volume.

A change in pressure will cause a corresponding change in the volume of air trapped inside the test tube, according to Boyle's Law. This relationship between pressure and volume is important in many areas of science and technology, such as in the design of engines, compressors, and pneumatic systems.

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Answer:Centripetal acceleration = v²/r = 8²/0.50 = 64/0.50 = 32

Centripetal force = mass * acceleration = 3 * 32 = 96 Newton

So, your answer is 96 Newton

Explanation:

When two capacitors 22 μF and 64 μF are connected to a 100-V source, the energy stored in each capacitor is different depending on whether the capacitors are connected in parallel or in series. When connected in parallel, the energy stored in each capacitor is 0.0022 mJ and 0.0064 mJ respectively. When connected in series, the energy stored in each capacitor is also 0.0022 mJ and 0.0064 mJ respectively.  

To answer the question of finding the energy stored in two capacitors 22 μF and 64 μF when connected to a 100-V source, first we need to determine if the capacitors are connected in parallel or series. When two capacitors are connected in parallel, the total capacitance is the sum of the individual capacitances.

Therefore, for two capacitors 22 μF and 64 μF connected in parallel, the total capacitance is 86 μF. The energy stored in each capacitor can be found using the formula W = ½CV2, where C is the capacitance and V is the voltage. For the 22 μF capacitor, W22 = 0.5 * 22 * 10-6 * (100)2 = 0.0022 mJ. Similarly, for the 64 μF capacitor, W64 = 0.5 * 64 * 10-6 * (100)2 = 0.0064 mJ.

When two capacitors are connected in series, the total capacitance is the reciprocal of the sum of the reciprocals of the individual capacitances. Therefore, for two capacitors 22 μF and 64 μF connected in series, the total capacitance is 4.3 μF.

The energy stored in each capacitor can be found using the same formula W = ½CV2. For the 22 μF capacitor, W22 = 0.5 * 22 * 10-6 * (100)2 = 0.0022 mJ. Similarly, for the 64 μF capacitor, W64 = 0.5 * 64 * 10-6 * (100)2 = 0.0064 mJ.

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The de Broglie wavelength of the recoiling electron is 0.0633 picometers.

The de Broglie wavelength of a particle with momentum p is given by λ = h/p, where h is Planck's constant. The momentum of the recoiling electron can be found using conservation of momentum:

where m_electron and v_electron are the mass and velocity of the electron, and m_alpha and v_alpha are the mass and velocity of the alpha particle.

Since the alpha particle is much more massive than the electron, we can assume that the velocity of the alpha particle is negligible after the collision, and we can solve for the velocity of the electron:

Now we can calculate the de Broglie wavelength:

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Answer:

A) d_o = 20.7 cm

B) h_i = 1.014 m

Explanation:

A) To solve this, we will use the lens equation formula;

1/f = 1/d_o + 1/d_i

Where;

f is focal Length = 20 cm = 0.2

d_o is object distance

d_i is image distance = 6m

1/0.2 = 1/d_o + 1/6

1/d_o = 1/0.2 - 1/6

1/d_o = 4.8333

d_o = 1/4.8333

d_o = 0.207 m

d_o = 20.7 cm

B) to solve this, we will use the magnification equation;

M = h_i/h_o = d_i/d_o

Where;

h_o = 3.5 cm = 0.035 m

d_i = 6 m

d_o = 20.7 cm = 0.207 m

Thus;

h_i = (6/0.207) × 0.035

h_i = 1.014 m

Some sort of base either underground or really high in the air. Zombies are unintelligent so locking your doors and having a safe unreachable location will give you time to relax.

Wear protective gear when going out so that zombies cannot get you. Gas mask, armor, and a weapon to fight with are good.

Collect food, water, and oxgen in your base. Sharing is not caring and feel free to stock material in order to survive.

The total travelled distance is • Speed, time and distance is one of the most common and important topics in the Mathematics or Quant section.

Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value.

For instance, 50 km/hr west denotes the velocity of a car whereas 50 km/hr (31 mph) denotes the speed at which it is moving down a route.

The average speed of an object is determined by dividing the distance traveled by the amount of time it takes the object to reach the distance.

Therefore, The total travelled distance is • Speed, time and distance is one of the most common and important topics in the Mathematics or Quant section.

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Answer: (d)

Explanation:

Given

Mass of the first ram \(m_1=49\ kg\)

The velocity of this ram is \(v_1=-7\ m/s\)

Mass of the second ram \(m_2=52\ kg\)

The velocity of this ram \(v_2=9\ m/s\)

They combined after the collision

Conserving the momentum

\(\Rightarrow m_1v_1+m_2v_2=(m_1+m_2)v\\\Rightarrow 49\times (-7)+52\times (9)=(52+49)v\\\Rightarrow v=\dfrac{125}{101}\ m/s \quad[\text{east}]\)

Momentum after the collision will be

\(\Rightarrow 101\times \dfrac{125}{101}=125\ kg-m/s\ \text{East}\)

Therefore, option (d) is correct

Answer:

So work require will be 3888×10×10³J

Explanation:

⇒Work done=Change in kinetic energy

⇒KE=1/2mv²

⇒Mass->15000kg

⇒Velocity->72km/h

⇒KE=1/2×15000×(72)²

⇒KE=1/2×15000×5184

⇒KE=7500×5184

⇒KE=3888×10×10³J

Answer:

609.6 cm is the answer

The attraction or repulsion between electric charges or the force between two charge bodies is called the coulomb force.

Coulomb's law or coulombs force (or Coulomb's inverse-square law) defines the force wielded by an electric field on an electric charge. This is the force acting between electrically charged objects and is determined by the value of the commerce between two stationary point electric charges in a vacuum. Coulomb's law states" The electrical force of magnet or aversion between two charges is equally commensurable to the forecourt of the distance that separates them." Coulomb's force is a consequence of Newton's third law that states that when two bodies interact, equal and contrary forces appear in each of them.

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Complete question: What is the attraction or repulsion between electric charges or the force between two charge bodies is called?

The results of the calculations demonstrate that the appropriate frequency bands for FM radio stations and TV channels 7 through 13 overlap.

The signals from radio and television stations are transmitted using particular frequency bands. The wavelength range for FM radio stations is between 2.78 and 3.41 metres (m), whereas the frequency range for TV channels 2 through 13 is between 59.5 and 215.8 megahertz (MHz).

To assess whether these frequency bands overlap, we can apply a formula that links frequency and wavelength.

The results of the calculations demonstrate that the appropriate frequency bands for FM radio stations and TV channels 7 through 13 overlap. This suggests that sometimes it can be challenging to receive both impulses since they might conflict with one another.

FM radio stations and TV channels 2 to 6 operate in distinct frequency bands, thus they may live harmoniously.

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Thermal energy is transferred between objects only when they have different temperatures.

The movement of atoms and molecules within a substance is a form of energy known as thermal energy.

When two objects are in contact, or even in proximity, the atoms and molecules in the hotter object collide with those in the colder object.

Because of these effects, a portion of the kinetic energy from the more sizzling object is moved to the colder object, raising the temperature of the previous and bringing down the temperature of the last option.

A material's thermal conductivity — an estimation of how well it moves heat — decides how rapidly heat is moved between various sorts of materials.

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The work done by the three students is 3,000 J.

The energy transferred in the process is 3,000 J.

W = Fd

The work done by the three students is calculated as follows;

W = 300 x 10

W = 3,000 J

The energy transferred in the process is determined by work energy theorem.

E = W

E = 3,000 J

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Answer:

A

Explanation:

It depends on the scale of the volcanic eruption. A smaller eruption may only affect the nearby area, but a large one can affect the whole world. For example, the Krakatoa eruption of 1883 created an ash cloud which lowered global temperatures and affected the climate for a year afterwards.

An explosive eruption by a single volcano can affect only the lifeforms living on the volcano. The correct option is B.

A volcano is an opening in the Earth's surface through which molten rock, ash, and gas can escape. Volcanoes are formed by the movement of tectonic plates, which create weak spots or vents in the Earth's crust where magma can rise to the surface.

Volcanoes can form in different ways, but most are formed at plate boundaries, where one tectonic plate is moving under another (subduction zone), or where two plates are moving away from each other (divergent boundary). When magma rises to the surface, it can form a volcanic cone or mountain over time.

There are three main types of volcanoes, based on their shape and the type of eruptions they produce:

(i)Shield volcanoes - broad, gentle slopes formed by lava flows that spread out over a wide area.

(ii)Stratovolcanoes (also called composite volcanoes) - tall, steep-sided cones formed by alternating layers of lava, ash, and other volcanic debris.

(iii)Calderas - large, basin-shaped depressions that form when a volcano collapses or erupts so forcefully that it empties its magma chamber.

Volcanoes can be active, dormant, or extinct. Active volcanoes are those that have erupted recently or are expected to erupt soon, while dormant volcanoes have not erupted in a long time but could still erupt in the future. Extinct volcanoes are those that have not erupted in thousands of years and are unlikely to erupt again.

Here in the question,

An explosive eruption by a single volcano can have a significant impact on the surrounding environment and local communities, but its effects are generally limited to the immediate vicinity of the volcano. The eruption may release ash, gases, and lava flows that can cause damage to nearby ecosystems and affect the health of humans and animals living in the area. However, the effects are unlikely to extend beyond the local region, let alone affect lifeforms throughout the world.

Therefore,  B. only the lifeforms living on the volcano, is the correct option.

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Answer:

1) θ = 45,  b)  R₄₀ = R₅₀ = (v₀² / g) 0.985,  R₂₅ = R₆₅ = (v₀² / g) 0.766

3)  θ = 90º, d)   y₂₅ = (v₀ / 2g)   0.179, y₄₅ = (v₀ / 2g) 0.5, y₆₅ = (v₀ / 2g) 0.821

Explanation:

This is a projectile throwing exercise, let's use the relations

         R = \(\frac{v_o^2 \ sin \ 2\theta }{g}\)

1) the angle for a maximum reach (R) is θ = 45

         R = v₀²/g

2) let's compare the scopes

θ = 25º

          R₂₅ = (v₀² /g) sin 2 25

          R₂₅ = (v₀² /g)  0.766

θ = 65º

         R₆₅ = (v₀² / g)  sin 2 65

         R₆₅ = (v₀² / g) 0.766

θ = 40º

        R₄₀ = (v₀²/g)  sin 2 40

        R₄₀ = (v₀²/ g) 0.985

θ = 50

        R₅₀ = (v₀²/g)  sin 2 50  

        R₅₀ = (v₀² / g) 0.985

we can see that it has the same scope

         R₄₀ = R₅₀ = (v₀² / g) 0.985

         R₂₅ = R₆₅ = (v₀² / g) 0.766

3) the maximum height is reached when the vertical speed is zero

         \(v_y^2 = v_{oy}^2 - 2 g y\)

          v_y = 0

         y = \(\frac{v_{oy}^2}{2g}\)

         y = (v₀² /2g) ( sin θ)²

therefore the height is maximum for θ = 90º

4) θ = 25º

         y₂₅ = (v₀ / 2g)   (sin 25)²

         y₂₅ = (v₀ / 2g)   0.179

θ = 45º

         y₄₅ = (v₀ / 2g) (sin 45)²

         y₄₅ = (v₀ / 2g) 0.5

θ = 65º

         y₆₀ = (v₀ / 2g) (sin 65)²

         y₆₅ = (v₀ / 2g) 0.821

5) It is appreciated that as the launch angle increases the height increases, the maximum is when the movement is vertical

For the launch angle, the reach has a maximum for the angle of 45º, this is due to the symmetry of the sine function around this value.

The answer is as voltage increases current increases and therefore resistance would remain constant

The final image is located 30 cm relative to the second lens.

First, we need to find the image location created by the diverging lens (first lens) using the lens formula: 1/f = 1/u + 1/v, where f is the focal length, u is the object distance, and v is the image distance.

For the diverging lens, f = -30 cm and u = -20 cm. Solving for v, we get an image distance of -60 cm relative to the first lens.
Next, we determine the object distance for the converging lens (second lens).

The lenses are 40 cm apart, and the first image is 60 cm behind the diverging lens, so the object distance for the second lens is 20 cm. The focal length of the converging lens is 60 cm.

Using the lens formula, we solve for the image distance (v) and find that it is 30 cm relative to the second lens.

Summary: By calculating the image distance for both lenses, we determine that the final image is located 30 cm relative to the second lens (converging lens). The correct answer is (D) 30.

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Answer:

he is the first person can be 3in and a 6man is the best not a man of the hartford

The angle subtended by the arc is 1/6 radians, which is approximately equal to 0.524 radians or 30 degrees.

To find the angle subtended by an arc of length 0.20 m on a circle of radius 1.20 m, we can use the formula for the arc length of a circle:

Arc Length = Radius x Central Angle

We can rearrange this formula to solve for the central angle:

Central Angle = Arc Length / Radius

Plugging in the given values, we get:

Central Angle = 0.20 m / 1.20 m

Simplifying, we get:

Central Angle = 1/6 radians

Therefore, the angle subtended by the arc is 1/6 radians, which is approximately equal to 0.524 radians or 30 degrees.

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Because copper is the second-best electrical conductor, it's cheaper and more plentiful than silver, and it's relatively easy to get it out of the ground, refine it, and form it into wires.

(If the electrical wiring in your house was all silver wire, I guess nothing would ever work, because people would keep stealing your wiring.)