Excitation of vibrational motion of molecules is associated with which region of the electromagnetic spectrum?.

The correct answer is option B.

A car is being lifted by a crane so that it moves upwards at a constant speed. Force of gravity is doing negative work on the car as it is being lifted upward.

In this case, we can see a certain amount of work is being done by the crane to uplift the car upward with constant speed.

The car also covers a displacement in upward direction.

In Physics, Work is defined as the distance covered by an object under a particular force. Work is the product of force and displacement i.e. w = F.d

However, as the car is moving in upward direction, so the displacement is upward while the force of gravity due to displacement is also acting on the car which is opposite the direction of displacement i.e. downward. Therefore, gravity is doing negative work on the car.

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The complete question is:

A car is being lifted by a crane so that it moves upwards at a constant speed. which force is doing negative work on the car as it is being lifted?

a) The force of rope acting on the car

b) The force of gravity acting on the car due to earth

c) The force of car acting on the rope

d) There is no work being done

Answer:

The distance travelled in the next 5 seconds is 20 m.

Explanation:

The distance travelled is given by the formula,

\(s=ut+\frac{1}{2} at^{2}\)

Where,

u is the initial velocity in m/s

t is the time in s

a is the acceleration in \(m/s^{2}\)

As per the given data,

u= 9 m/s

t= 5 s

a= -2 \(m/s^{2}\) (The negative sign indicates the deceleration)

Substituting the values,

\(s=(9) * (5) +\frac{1}{2} (-2) (5)^{2}\)

=45-25

=20

So, a runner travels 20 m in the next 5 seconds.

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Answer:

https://brainly.com/question/24997963 this will help you. You need to sq rt the added values then divide a+b by the square value. Keeping anything thats negative negative if negative is answer and set to = cos theta. then convert from cos theta = 1 cos will = 0. But if cos theta = decimal then ensure its positive number and that's your answer. Formula a+b/ sqrt a+b

Explanation:

The current is 5 amperes (option c). To calculate the current (in amperes) when a certain amount of charge passes through a wire in a given time, we can use the formula: I = Q / t.

To calculate the current (in amperes) when a certain amount of charge passes through a wire in a given time, we can use the formula:

I = Q / t

Where:

I is the current (in amperes)

Q is the charge (in coulombs)

t is the time (in seconds)

In this case, we have Q = 10.0 coulombs and t = 2.0 seconds. Substituting these values into the formula, we get:

I = 10.0 coulombs / 2.0 seconds = 5 amperes

Therefore, the current is 5 amperes (option c).

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To determine the value of c2−4mk, we need to use the given values and equations.Given: m = 4 kg (mass), k = (7.5 N / 1.5 m) = 5 N/m (spring constant), c = 4 (damping constant)

Using these values, we can calculate c2−4mk as follows:
c2−4mk = (4)2 - 4(5)(4) = 16 - 80 = ... (final result)
To find the position of the mass after it is released with zero velocity, we can use the equation of motion for a damped harmonic oscillator:
x(t) = A * e^(-ct/2m) * cos(√(k/m - c^2/4m^2) * t + φ)
In this case, the mass is released with zero velocity, which means the initial conditions are:
x(0) = 3 m (initial displacement)
v(0) = 0 m/s (initial velocity)
Using these initial conditions and the given values, you can substitute them into the equation to calculate the position of the mass at any given time. The phase angle φ can be determined based on the specific initial conditions.

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We can say that the downward gravitational pull of the Earth on the car and the upward contact force of the Earth on it are equal and opposite because the two forces form an interaction pair.

According to Newton's Third Law of Motion, for every action force, there is an equal and opposite reaction force. In the case of the car at rest, the action force is the gravitational force exerted on the car by the Earth, which is directed downwards. The reaction force is the contact force exerted on the car by the Earth, which is directed upwards.

Since these two forces are equal and opposite, we can conclude that the net force on the car is zero. Mathematically, we can represent this as:

F_gravity = -F_contact

where F_gravity is the gravitational force exerted on the car by the Earth, and F_contact is the contact force exerted on the car by the Earth.

By adding the two forces, we get:

F_net = F_gravity + F_contact = 0

This means that the car is in a state of equilibrium, and there is no net force acting on it.

In conclusion, we can conclude that the downward gravitational pull of the Earth on the car and the upward contact force of the Earth on it are equal and opposite because the two forces form an interaction pair. This relationship is explained by Newton's Third Law of Motion, which states that every action force has an equal and opposite reaction force. Since the net force on the car is zero, it is in a state of equilibrium.

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There is a disk rotating around an axis, and on this disk, there are two points labeled as "a" and "b." Point "a" is located three times farther from the axis compared to point "b."

Let's assume that the distance of point b from the axis is "r" units. Since point a is three times as far from the axis as point b, the distance of point a from the axis is 3r units.

The speed of a point on a rotating disk is determined by its distance from the axis and the angular velocity of the disk. In this case, the angular velocity is the same for both points a and b, as they are on the same rotating disk.

The formula that relates the speed (v) of a point on a rotating disk to its distance from the axis (r) and the angular velocity (ω) is:

v = ω * r

For point b:

\(v_b = \omega \cdot r\)

For point a:

\(v_a = \omega \cdot (3r)\)

Since the angular velocity (ω) is the same for both points, we can express it as a common factor:

\(v_a = 3 * v_b\)

Therefore, the speed of point a is three times the speed of point b.

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We may use the equations of motion to calculate the initial distance between the two objects in this issue. Let's call the starting height of the objects "h." Because the first item is at rest, its initial vertical velocity is 0.

When the second item is launched horizontally at a speed of 2.5 m/s, its initial vertical velocity is also 0. When the items crash after falling 20 meters, we may apply the following equation of motion: h = 1/2gt^2 where g denotes gravity's acceleration and t the time it takes for the objects to collide. The horizontal velocity of the second item may be used to calculate the time t: distance = time x speed 20m = 2.5m/s x t t = 8 seconds Now we can use the equation of motion again to find h: h = 1/2gt^2 = 1/2 x 9.81 m/s^2 x (8 s)^2 = 313.92 m Therefore, the initial distance between the objects was 313.92 meters.

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Answer:

To solve this problem, we need to use the concept of buoyancy. When an object is submerged in a fluid, it experiences a buoyant force, which is equal to the weight of the fluid displaced by the object. This buoyant force reduces the apparent weight of the object.

Let's start by finding the weight of the rock in air:

Weight of rock in air = mass of rock x acceleration due to gravity

= 0.6 kg x 9.8 m/s^2

= 5.88 N

Now, let's find the weight of the fluid displaced by the rock when it is submerged in water:

Weight of fluid displaced = mass of fluid displaced x acceleration due to gravity

The mass of fluid displaced is equal to the volume of the rock submerged in water times the density of water. We can use the apparent mass of the rock to find the volume submerged in water:

Volume submerged in water = (weight of rock in air - weight of rock in water) / (density of water x acceleration due to gravity)

= (5.88 N - 3.75 N) / (1000 kg/m^3 x 9.8 m/s^2)

= 0.0228 m^3

Now, we can find the weight of fluid displaced by the rock:

Weight of fluid displaced = 0.0228 m^3 x 1000 kg/m^3 x 9.8 m/s^2

= 224.16 N

The buoyant force acting on the rock is equal to the weight of fluid displaced:

Buoyant force = 224.16 N

Therefore, the weight of the rock when submerged in water is:

Weight of rock in water = Weight of rock in air - Buoyant force

= 5.88 N - 224.16 N

= -218.28 N

The negative sign indicates that the buoyant force is acting in the upward direction, opposing the weight of the rock.

Now, we can find the density of the rock using the formula:

Density = mass / volume

The mass of the rock is 0.6 kg, and the volume of the rock is equal to the volume submerged in water:

Density = 0.6 kg / 0.0228 m^3

= 26.32 kg/m^3

Therefore, the density of the rock is 26.32 kg/m^3.

Explanation:

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One of the first explanations for the high redshifts of quasars was that they were ejected from galaxies at extremely high speeds. Since no quasars with significant blueshifts have been discovered, this hypothesis was dismissed.

It explains why quasars with both blue shifted lines should be expected if they were ejected from neighboring galaxies. By calculating the quasar's redshift, one can determine how big the universe was in comparison to how big it is now. The quasars were identified to have significant radio emission but the appearance of stars.

At first, their visible light looked perplexing, but astronomers soon discovered that they had significantly greater redshifts than stars. Redshifts for the quasars in the currently available spectra range from 15% to over 96% of the speed of light.

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Answer: If all forces acting on a car are zero, than the cars speed is zero since there are no forces to push or pull the car :)

Explanation:

The temperature decreases 5°C in one hour and then decreases another 3°C in the next hour fits the description of weather.

This is defined as the atmospheric condition of a place within a short period of time and is influenced by a lot of factors in the environment.

In this scenario, the temperature was taken every hour which is a short period of time and is thereby denoted as weather.

On the other hand, climate is the condition of a place over a long period of time which is usually up to a year which is why weather fits the definition provided.

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Answer:

48.55mm

Explanation:

The correct response is 3. 4.5 W for the power lost by 40 ohm resistor that is depicted.

In electronics, each circuit is a wholly circular path for electricity to travel. A simple circuit consists of a current supply, conductors, as well as a load. The term "circuit" can broadly be used to describe any ongoing path via which energy, data, or even a signal might go.

Each circuit is made to supply electricity to one or maybe more loads. For instance, the speakers of a boombox receive power. The light bulb in a lamp receives power similarly.

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Answer:

When the student slides the rock along the flat surface of the frozen pond, according to Newton's second law of motion, the rock is given an initial velocity of motion. According to Newton's first law of motion, the rock will continue to slide indefinitely unless it is slowed or stopped by an opposite force. According to Newton's third law, the rock experiences a reaction force from the force of friction of the ice which slows it down at a rate given by Newton's second law of motion and the rock is seen to decelerate

Explanation:

Newton's first law of motion, states that an object will remain at rest or maintain a uniform motion in a straight line, unless impressed upon by an external force

Newton's second law states that an applied force is equal to the rate of change of momentum it produces

Newton's third law states action and reaction are equal and opposite.

Answer:

B. herbivore.

Explanation:

Meadow voles primarily consume plants, such as grasses, herbs, and bark, although they may also eat insects occasionally. As a result, their niche in an ecosystem is that of a herbivore, which is an organism that consumes primarily plants.

The specific heat capacity of the metal sample is determined from the ratio of quantity heat to the product of mass and temperature rise.

The specific heat capacity of a substance is the quantity of heat required to raise a unit mass of the substance.

Q = mcΔθ

where;

c = Q/mΔθ

Thus, the specific heat capacity of the metal sample is determined from the ratio of quantity heat to the product of mass and temperature rise.

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Answer:

Toaster

Explanation:

A toaster draws electric current (electrical energy) from a wall outlet and converts these moving electric charges into heat (thermal energy) in the filaments that turn red hot to cook your toast. ... As electricity runs through the filaments in a space heater, the electrical energy is converted into heat (thermal energy).

Answer:

Explanation:

A hydrometer is a device used to measure the density of liquids, typically calibrated around the density of pure water. The behavior of a hydrometer in different liquids will depend on the density of the liquid compared to the density of pure water. Here are a couple examples of liquids and how a hydrometer calibrated around the density of pure water would behave:

It's important to note that the density of liquids can vary depending on temperature, pressure and chemical composition, so a hydrometer must be calibrated under specific conditions.

To find the image distance formed by a concave mirror, we can use the mirror equation:

1/f = 1/di + 1/do

Where:

f is the focal length of the mirror,

di is the image distance,

and do is the object distance.

In this case, the object distance (do) is given as 12.0 cm, and the focal length (f) is given as 15.0 cm. We can rearrange the equation to solve for the image distance (di):

1/di = 1/f - 1/do

Substituting the given values:

1/di = 1/15 - 1/12

To simplify this expression, we need to find a common denominator:

1/di = (12 - 15)/(12 * 15)

1/di = -3/180

Now, we can invert both sides to find di:

di = 180/-3

di = -60 cm

Therefore, the image distance is -60 cm. The negative sign indicates that the image is formed on the same side as the object (in this case, it is a virtual image).

Answer:

60 cm

Explanation:

the U (obj. distance)  =   12  as it is a concave mirror then u  =  -12cm

the f = -15cm

by mirror formula

1/v  +  1/u =  1/f

by substituting values

1/v  +  (1/-12)  =  1/-15

1/v = 1/-15 -(1/-12)

1/v = 1/-15 + 1/12

by taking L C M  60

1/v = -(4/60)  +  5/60

1/v = 1/60

so V = 60 cm

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Answer:

A.add the forces

Explanation:

since they're both going in the same direction then they should be added to get the total net force.

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The net force acting on the airplane if, An airplane is flying at 80 kilometers per hour when a strong tailwind, traveling in the same direction at 5 kilometers per hour is 85 km/hr so, option A is correct.

Force is the influence of either pull or pushes in the body. Basically, gravitation forces, nuclear forces, and friction forces are the types of forces.

For e.g. when the wall is hit by a hand then a force is exerted by the hand on the wall as well as the wall also exerts a force on the hand. There are different laws given to Newton to understand force.

Given:

An airplane is flying at 80 kilometers per hour when a strong tailwind, traveling in the same direction at 5 kilometers per hour,

Calculate the net force acting on the airplane as shown below,

The net force acting on the airplane = The velocity of the airplane + velocity of the wind  (As they both are in the same direction)

The net force acting on the airplane = 80 km / hr + 5 km / hr

The net force acting on the airplane = 85 km / hr

Thus, the net force acting on the airplane is added.

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The maximum size of the gold nucleus is approximately \(8.36 * 10^{-15} m.\)

The maximum size of a gold nucleus can be calculated from the information given as follows:

Given information: Average kinetic energy of 0-particles, E = \(2 * 10^1^0 J\)

Charge of a particle, q = \(1.69 * 10^-^1^9\) C ,  Atomic mass of gold, A = 79

Energy of 0-particles can be related to the radius of the nucleus by using the semi-empirical mass formula, which is given by

E = \(a_v A - a_s A^(2/3) - a_c (Z^2/A^(1/3)) - a_a (A - 2Z)^2/A + KE\)

where\(a_v, a_s, a_c, and a_a\) are constants representing different types of nuclear energies, Z is the atomic number of the element (number of protons), KE is the kinetic energy of the emitted particle, and A is the atomic mass of the element.

The equation can be rearranged to find the radius of the nucleus,

\(R:R = r_0 A^(1/3) + c Z(Z - 1)/A^(1/3)\) where \(r_0 = 1.2 * 10^-^{15} m\) and \(c = 1.33 * 10^{-15} m\)

We can find Z by using the atomic mass and atomic number of gold:

Atomic number, Z = A - number of neutrons Z = 79 - (118 - 79) = 40

We can now substitute the given values into the equation for R to find the maximum size of the gold nucleus:

R = \(r_0 A^{(1/3)} + c Z(Z - 1)/A^{(1/3)R\)

  = \((1.2 * 10^{-15 m})(79)^{(1/3)} + (1.33 *10^-15 m)(40)(39)/(79)^{(1/3)R}\)

   ≈\(8.36 * 10^{-15} m.\)

Therefore, the maximum size of the gold nucleus is approximately \(8.36 * 10^{-15} m.\)

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If the same amount of heat Q is applied to each cube, the aluminum cube will have a greater end temperature than the iron cube.

The average thermal energy of the particles in a system is measured by temperature. It is a scalar number that represents the amount of heat energy present in a substance and is usually expressed in degrees Celsius (°C), Kelvin (K), or Fahrenheit (°F). The kinetic energy of the particles in a system, which is the energy associated with their motion, is proportional to temperature. When a system's temperature rises, so does the kinetic energy of its particles, resulting in quicker and more chaotic motion. In contrast, when the temperature drops, the The particles' kinetic energy reduces, resulting in slower and less chaotic motion.

Here, The eventual temperature of the two cubes will be determined by their respective heat capacities. The quantity of heat energy required to raise the temperature of a unit of mass of a material by one degree Celsius is defined as its specific heat capacity.

Aluminum has a greater specific heat capacity than iron, which means it takes more heat energy to increase its temperature by the same amount.

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Answer: B, Ice has a lower density than liquid water.

Answer:

a) velocity - time realation

that graph's gradient gives the uniform acceleration

Answer:

thrust

Explanation:

Answer:

thrust

Explanation: