A kite 100 ft above the ground moves horizontally at a speed of 12 ft/s. at what rate is the angle (in radians) between the string and the horizontal decreasing when 200 ft of string have been let out?

Answer: The velocity of the object will be 8m/s.

Explanation:

Force exerted on the object = 80 N

Distance displaced by object by the action of force = 4 m

Mass of the object =  10 kg

Velocity gained by the object = v

Kinetic energy of the object =  Work done on the object

[tex]\frac{1}{2}mv^2=Force\times displacement[/tex]

[tex]\frac{1}{2}\times 10\times v^2=80 N\times 4 m[/tex]

[tex]v^2=64 m^2/s^2[/tex]

[tex]v=8 m/s[/tex]

The velocity of the object will be 8m/s.

The energy from stars is released through a process called nuclear fusion, where hydrogen atoms combine to form helium and release a tremendous amount of energy. This energy is in the form of electromagnetic radiation, including visible light, infrared radiation, ultraviolet radiation, and X-rays. Stars release this energy continuously throughout their lifetimes.

The energy from stars is released through a process called nuclear fusion. In the core of a star, hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the process. This energy is in the form of electromagnetic radiation, which includes visible light, infrared radiation, ultraviolet radiation, and X-rays.

During nuclear fusion, the mass of the combined helium nucleus is slightly less than the mass of the original hydrogen atoms. This mass difference is converted into energy according to Einstein's famous equation, E=mc^2, where E represents energy, m represents mass, and c represents the speed of light.

Stars release this energy continuously throughout their lifetimes, providing the heat and light that sustains life on Earth and allowing astronomers to study distant objects in the universe.

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Answer:

C). Genetic engineering can help reduce the effects of pests and weather on crop production.

Explanation:

the pressure difference between the two ends of a 2.0-km section of pipe, 25 cm in diameter, if it is to transport oil 10206.8139295042 Pa

the viscosity can be defined as the resistance that a fluid will flow when sliding one sheet over another.

Kinematic viscosity can be defined as its unit only depend on kinematic units (m / s ^ 2) and not physical properties such as mass.

Viscosity is described as both liquids and gases, it refers to the ability of a gas or liquid to resist flow.

In other words, it  exists between the molecules of a fluid, which resists its flow.

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Answer:

(2) 2s

Explanation:

Remember that the time that it takes an object to fall from a certain distance is only determined by the force with which the object is pulled towards the center of the earth which is gravity, so any object with 0 velocity will drop at the same rate to the ground when dismissing resistance from the air, in to calculate this you just have to use the next formula:

[tex]H=\frac{g*t^2}{2}\\ t=\sqrt{\frac{2H}{g} }[/tex]

So we just insert the data that we have into the formula:

[tex]t=\sqrt{\frac{2H}{g} }\\t=\sqrt{\frac{2*19,6}{9,81} }\\t=\sqrt{4}\\ t=2 seconds[/tex]

The steel guitar string stretches by 15 mm under a tension of 1500 N.

To determine how far a steel guitar string stretches under a tension force, we use principles from materials science, specifically Young's modulus and Hooke's law.

Identify the given values:

Initial length, l = 1.00 m

Cross-sectional area, a = 0.500 mm² = 0.500 × 10⁻⁶ m²

Young's modulus, Y = 2.0 × 1011 N/m²

Tension force, F = 1500 N

Use the formula for elongation:

δl = (F × l) / (Y × a)

Substitute the given values into the formula:

[tex]\delta l = \frac{1500 \, \text{N} \times 1.00 \, \text{m}}{2.0 \times 10^{11} \, \text{N/m}^2 \times 0.500 \times 10^{-6} \, \text{m}^2} \\[/tex]

Calculate the result:

[tex]\delta l = \frac{1500 \times 1.00}{2.0 \times 10^{11} \times 0.500 \times 10^{-6}} \\[/tex]

[tex]\delta l = \frac{1500}{1.0 \times 10^5} = 0.015 \, \text{m} = 15 \, \text{mm}[/tex]

The string stretches by 15 mm when a tension of 1500 N is applied.

The two football players move together at a velocity of 5.99 m/s immediately after the collision. This value was obtained by conserving the momentum of the system: calculating individual momenta before the collision, summing them to obtain total momentum, and then dividing this by the total mass of both players. This is a typical conservation of momentum problem in high school level physics.

The situation you're describing is a perfect example of a conservation of momentum problem in physics. In this problem, the two football players can be seen as a system, and their individual momenta before the tackle add up to yield the total momentum of the system after the tackle, when they're moving together.

Momentum is calculated as mass times velocity, so we first calculate the momentum of each player before the collision. For the linebacker: 120kg× 8.6m/s = 1032 kg×m/s north. For the halfback: 75kg× 7.4m/s = 555 kg×m/s east.

These two momentum vectors form a right triangle, with the hypotenuse representing the  result vector or total momentum of the system after the tackle. We can use the Pythagorean theorem to calculate the magnitude of this vector: sqrt((1032²)+(555²)) = 1169 kg*m/s.

Since the players are moving together after the collision, the mass we use to find the final velocity should be the total mass of both players: 120kg + 75kg = 195 kg. The magnitude of the velocity at which the two players move together immediately after the collision can then be obtained by dividing the total momentum by the total mass: 1169kg×m/s / 195kg = 5.99 m/s.

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The pair of atoms that will form an ionic compound is "One atom of calcium and two atoms of chlorine.". The correct option is B.

In an ionic compound, one atom gives up one or more electrons to another atom, resulting in positively charged cations and negatively charged anions that are attracted to each other due to electrostatic forces.

Here in the question

In option B, calcium (Ca) has two valence electrons, while chlorine (Cl) has seven valence electrons. To obtain a stable octet configuration, calcium will lose two electrons to form a Ca2+ cation, and two chlorine atoms will each gain one electron to form Cl- anions. The resulting compound, CaCl2, is an ionic compound with a crystal lattice structure held together by electrostatic forces between the oppositely charged ions.

Option A involves two non-metals, and they typically form covalent compounds, not ionic compounds.

Option C is similar to option A and also involves two non-metals, which typically form covalent compounds.

Option D involves two non-metals, and although the atoms can bond covalently, the compound formed would be a polar molecule, not an ionic compound.

Therefore, The correct option is B i. e One atom of calcium and two atoms of chlorine which forms an ionic compound.

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The examination of color and streak are the physical tests that are performed on the minerals to know their exact origin.

Hence, this can be stated that a streak is useful to give true color of the mineral.

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First let us convert the distance into meters.

distance = 1600 km = 1,600,000 m

Then we get the maximum time by dividing the distance with the smallest movement rate possible, that is:

maximum time = 1,600,000 m / (50 m / year)

maximum time = 32,000 years

Final answer:

Using the minimum movement rate of 50 meters per year, the maximum amount of time required for an ice sheet to travel 1600 kilometers from Hudson Bay to Lake Erie is calculated to be 32,000 years.

Explanation:

The question revolves around calculating the maximum amount of time required for an ice sheet to move from the southern end of Hudson Bay to the south shore of present-day Lake Erie, a distance of 1600 kilometers, given varying movement rates.

First, convert kilometers to meters since the movement rates are given in meters per year. The distance is 1,600 kilometers, which equals 1,600,000 meters. Since we are interested in the maximum amount of time required, we will use the minimum speed of 50 meters per year. This will yield the longest possible time it would take for the ice sheet to cover this distance.

To find the time, we use the formula: Time = Distance / Speed. Substituting the given values: Time = 1,600,000 meters / 50 meters per year = 32,000 years.

Therefore, at a movement rate of 50 meters per year, the maximum amount of time required for an ice sheet to travel from Hudson Bay to Lake Erie would be 32,000 years.

Answer: 3 m/s

Explanation:

We can solve the problem by using the law of conservation of momentum: during the collision between the two balls, the total momentum of the system before the collision and after the collision must be conserved:

[tex]p_i = p_f[/tex]

The total momentum before the collision is given only by the cue ball, since the solid ball is initially at rest, therefore

[tex]p_i = m_c u_c = (0.5 kg)(3 m/s)=1.5 kg m/s[/tex]

So, the final total momentum will also be

[tex]p_f = 1.5 kg m/s[/tex]

And the total momentum after the collision is given only by the solid ball, since the cue ball is now at rest, therefore:

[tex]p_f = m_s v_s[/tex]

from which we find the velocity of the solid ball

[tex]v_s = \frac{p_f}{m_s}=\frac{1.5 kg m/s}{0.5 kg}=3 m/s[/tex]

3, just did the assignment

Answer:

D.  1.4 × 10^2 kilogram meters/second

We know that in an elastic collision the moments of the both the objects is conserved i.e

Intial momentum of object1 + Intial momentum of object2 =Final momentum of object1 + Final momentum of object2

Intial momentum of object1 =12 kg.m/s

Intial momentum of object2 = P (assume that P is the momentum)

Final momentum of object1= 14 kg.m/s

Final momentum of object2 =16 kg.m/s

On substituting all values we get

12 + P =14 kg.m/s + 16 kg.m/s

P = -18 kg.m/s

(-ve sign indicates the second object was moving in the opposite direction to the object1 before collision )

Therefore the initial momentum of the second object was 18 kg.m/s.

The distance of every object in a round trip is always positive

Distance is a scalar quantity, the total distance of an object in any trip is the total path covered by the object from the starting point to the finish point.

On the other hand, the displacement of the object will be zero. Displacement is the change in the position of an object.

Thus, we can conclude that the distance of every object in a round trip is always positive while the displacement is zero.

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Scientists have proven that genes play no role in self-esteem is a FALSE statement. In fact, most mental health (including self-esteem) has many connections with genetics.

The OXTR gene is said to be related to our self-esteem. Just a fun fact:

Those with 1 or 2 copies of the OXTR with an "A" allele gene are shown to be the more "negative" type of people with lower self-esteems. Those with 2 copies of the OXTR with a "G" allele gene were said to be more optimistic.

The statement that genes do not affect self-esteem is false. Research has found a connection between certain genes and levels of self-esteem, although genes are not the only influencing factors.

The statement that genes play no role in self-esteem is False. It has been scientifically proven that genes play a role in determining an individual's level of self-esteem. Through research studies, it has been observed that there is a connection between specific genes and self-esteem. Such studies involve analyzing the DNA of different individuals and examining the likelihood of these individuals having higher or lower self-esteem, depending on the presence of certain genes.

Research suggests that genes can have an influence on certain personality traits which are associated with self-esteem. For instance, individuals who are naturally more outgoing or socially inclined due to their genetic makeup might have a higher self-esteem than those who are introverted. However, it's important to note that genes are not the only factors that influence self-esteem - environmental factors also play a significant role.

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Final answer:

The distance from the cannon to the ship is 32.0 km, but to calculate initial velocity and maximum height of the shell, additional information such as angle of launch or time is required. The Earth's curvature slightly affects the height of the ocean's surface relative to the ship over long distances.

Explanation:

Assuming the dread pirate Roberts never misses, the distance from the end of the cannon to the ship trying to be hit is the maximum distance the cannon shell can travel, which is 32.0 km when neglecting the dimensions of the cannon and air resistance. To calculate the initial velocity of the shell, we would use the kinematic equations for projectile motion. However, the question does not provide angle of launch or time required for the calculation, so further information would be needed to complete part (a).

For part (b), the maximum height reached by the shell cannot be calculated without additional information such as the launch angle or time of flight. For part (c), the curvature of the Earth impacts the level of the ocean's surface in relation to a straight line extending from the ship. Using the Earth's radius (6.37×10³ km), we can apply the principles of geometry to find the drop in height over a distance of 32.0 km, with the assumption that the ocean surface follows the curvature of the Earth.

i just did it and the answer us A

We can use the temperature coefficient of resistance to determine the resistance of the nichrome wire at 0.0 °C. The temperature coefficient of resistance (α) is the amount by which the resistance of a material changes per degree Celsius of temperature change.

Given information:

Resistance of the nichrome wire at 11.5°C = 200.00 Ω

Temperature at which resistance is to be found = 0.0°C

We can use the following formula to find the resistance of the nichrome wire at 0.0°C:

R₂ = R₁ [1 + α (T₂ - T₁)]

Where,

R₁ = Resistance of the wire at temperature T₁

R₂ = Resistance of the wire at temperature T₂

α = Temperature coefficient of resistance

T₁ = Temperature at which R₁ is given

T₂ = Temperature at which R₂ is to be found

Since we are given the resistance of the nichrome wire at 11.5°C, we can take this as R₁ and T₁ as 11.5°C. We also know that the temperature coefficient of resistance for nichrome wire is 0.0004 per °C.

Substituting the given values into the formula, we get:

R₂ = 200.00 Ω [1 + (0.0004/°C) (0.0°C - 11.5°C)]

R₂ = 200.00 Ω [1 - 0.0046]

R₂ = 200.00 Ω (0.9954)

R₂ = 199.08 Ω

Therefore, the resistance of the nichrome wire at 0.0°C is 199.08 Ω.

Nichrome wire resistance at 0.0°C is 199.08 Ω.

Calculate nichrome wire resistance at 0.0°C using its temperature coefficient and resistance at 11.5°C.

The resistance R of a conductor at a temperature T is given by the formula:

[tex]\[ R_T = R_0 \left(1 + \alpha \Delta T\right) \][/tex]

Rearrange the formula to find [tex]\( R_0 \)[/tex] (resistance at 0.0°C):

[tex]\[ R_0 = \frac{R_{11.5}}{1 + \alpha \Delta T} \][/tex]

[tex]\( \Delta T \)[/tex]= 11.5 °C - 0.0°C = 11.5°C

Substitute the values:

[tex]\[ R_0[/tex]=  200.00Ω/(1 + (0.0004°C* 11.5°C))

[tex]\[ R_0[/tex] = 200.00Ω/(1 + 0.0046)

[tex]\[ R_0[/tex] = 200.00Ω/(1.0046)

[tex]\[ R_0[/tex] = 199.08 Ω

Final answer:

The number 6.3 is expressed in scientific notation as 6.3×10^0.

Explanation:

To express the number 6.3 in scientific notation, we need to follow a standard format where the number is between 1 and 10 followed by an exponent of 10.

For 6.3, this is already the case, so it can be expressed as 6.3×10^0 because any number raised to the power of 0 is equal to 1, so this does not change the value of 6.3.

Therefore, when writing in scientific notation, we are just acknowledging that we could move the decimal zero places and maintain the same value.

Answer:

It takes 2.04s to get to the maximum height

Explanation:

This is a vertical throw problem so it can be  treated as a uniform accelerated rectilinear motion. For computing time we are going to use the formula:

[tex]v_{f}=v_{o}+g*t[/tex]

where[tex]v_{f}[/tex] is the final velocity, [tex]v_{o}[/tex] is the initial velocity, [tex]t[/tex] is the time and, [tex]g[/tex] is the gravity.

For solving this kind of problems we need at least three values. The values we have are:

Now:

[tex]v_{f}=v_{o}+g*t[/tex]

[tex]v_{f}-v_{o}=g*t[/tex]

[tex]\dfrac{v_{f}-v_{o}}{g}=t[/tex]

[tex]\dfrac{0-20}{-9.8}=t[/tex]

[tex]t=2.04s[/tex]

It is the second one or the one with the letter F