Scientific _____ must be supported by observations and results many investigations and are not absolute

The resulting angular speed of the student and the stool system after catching the tossed mass is 0.354 rad/s, calculated using the conservation of angular momentum.

To find the resulting angular speed of the student and the stool after catching the mass, we need to apply conservation of angular momentum since no external torques act on the system. Initially, the system (student and stool) is at rest, so the initial angular momentum is 0. Upon catching the mass, the student-stool system gains angular momentum from the tossed mass.

The angular momentum of the tossed mass just before it is caught is given by L = mvr, where m is the mass of the object, v is its tangential velocity, and r is the distance from the axis of rotation to where the mass is caught. Plugging in the given values, L = (1.5 kg)(2.3 m/s)(0.42 m) = 1.449 kg·m²/s. This is the angular momentum that the system will have after the mass is caught because of the conservation of angular momentum.

To find the angular speed ω of the student-stool system after catching the mass, we use the equation L = Iω, where I is the moment of inertia of the system, and rearrange it to ω = L/I. The moment of inertia of the system remains 4.1 kg·m² since we are told to ignore any potential changes due to the mass being caught. Thus, ω = 1.449 kg·m²/s / 4.1 kg·m² = 0.354 rad/s.

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The change in thermal energy of a wooden block with a mass of 20.0 kg and a specific heat of 1700 J/kg°C warming from 15.0°C to 25.0°C is 340,000 Joules (or 340 kJ).

To find the change in thermal energy of the block as it warms from 15.0°C to 25.0°C, we can use the formula for specific heat capacity, which is Q = mcΔT. Here, Q represents the thermal energy transferred, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

For the given wooden block, we know:

Now we can calculate the change in thermal energy:

Q = mcΔT = (20.0 kg)(1700 J/kg°C)(10.0°C) = 340,000 J

Therefore, the change in thermal energy of the wooden block is 340,000 Joules (or 340 kJ).

Answer: Option (C) is the correct answer.

Explanation:

Nucleus of an atom consists of protons and neutrons. Whereas electrons revolve around the nucleus of the atom.

Protons are positively charged, neutrons have no charge and electrons are negatively charged. So, like charge of protons tend to oppose each other and as a result, electrostatic force of repulsion occurs.

This electrostatic force of repulsion is overcome by strong nuclear force which helps in binding of protons and neutrons into the nucleus.

Thus, we can conclude that the force that is most responsible for the stability of the atomic nucleus is strong nuclear force.

At which labeled points would the skateboarder have the most kinetic energy?

a. W and X

c. Y and Z

d. W and Z

Here's the picture for everyone :0

The skateboarder will have the most kinetic energy at point X and Y.

Kinetic energy is the energy possessed by an object due to its motion. Kinetic decreases with decrease in speed of the object.

K.E = ¹/₂mv²

In the given diagram, the skateboard will have have the highest speed at point X and Y. Kinetic energy is directly proportional to speed  

Thus, we can conclude that the skateboarder will have the most kinetic energy at point X and Y.

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A hot air balloon is ascending at speed of 7.5 m/s when a passenger drops a camera. If the camera is 25 m above the ground when it is dropped, it will take the object 3.15 seconds to reach the ground.

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

The time it takes for an object to reach a certain level given the distance and the initial velocity can be calculated through the equation,

   d = V₀t + 0.5*gt²

Where d is the distance, V₀ is the initial velocity, g is the acceleration due to gravity and t is time. Substituting the known values from the given above,

  25 = (-7.5)(t) + 0.5(9.8 m/s²)(t²)

The value of t from the equation 3.15 s

A hot air balloon is ascending at speed of 7.5 m/s when a passenger drops a camera. If the camera is 25 m above the ground when it is dropped, it will take the object 3.15 seconds to reach the ground.

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Answer:

C. Protons have an electrical charge, but neutrons have no charge.

Explanation:

Protons and neutrons both are parts of nucleus and they stay inside the nucleus due to large nuclear force between them

Mass of proton and mass of neutron is almost same or in more precisely we can say that neutrons are slightly heavy than protons

mass of neutrons is 1.008 amu while mass of protons are 1.007 amu.

the main different between them is that protons are positively charged and their charge is same as that of charge of electron

[tex]q_{proton} = 1.6 \times 10^{-19} C[/tex]

while neutrons are electrically neutral and they do not have any charge on them.

so correct answer will be

C. Protons have an electrical charge, but neutrons have no charge.

Answer:

c

Explanation:

Only about 11% of the volume of the iceberg is exposed.

[tex]\texttt{ }[/tex]

The basic formula of pressure that needs to be recalled is:

Pressure = Force / Cross-sectional Area

or symbolized:

[tex]\large {\boxed {P = F \div A} }[/tex]

P = Pressure (Pa)

F = Force (N)

A = Cross-sectional Area (m²)

Let us now tackle the problem !

[tex]\texttt{ }[/tex]

Given:

Density of Ice = ρ_ice = 0.92 g/cm³

Densiy of Seawater = ρ_seawater = 1.03 g/cm³

Asked:

Volume of the exposed iceberg = ΔV = ?

Solution:

We will use Archimedes' principle to solve the problem as follows:

[tex]w = F[/tex]

[tex]mg = \rho_{seawater} g V'[/tex]

[tex]\rho_{ice} \ g V = \rho_{seawater} \ g V'[/tex]

[tex]V' = ( \rho_{ice} \div \rho_{seawater} ) V[/tex]

[tex]V' = (0.92 \div 1.03) V[/tex]

[tex]V' = \frac{92}{103} V[/tex]

[tex]\texttt{ }[/tex]

[tex]\Delta V = V - V'[/tex]

[tex]\Delta V = V - \frac{92}{103} V[/tex]

[tex]\Delta V = \frac{11}{103}V[/tex]

[tex]\Delta V \approx 11 \% V[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Pressure

[tex]\texttt{ }[/tex]

Keywords: Gravity , Unit , Magnitude , Attraction , Distance , Mass , Newton , Law , Gravitational , Constant , Liquid , Pressure

Extrinsic motivation is not a characteristic of a creative person. Hence, option (B) is correct.

The psychological phenomena in which people engage in particular behaviors as a result of rewards from outside sources is known as "extrinsic motivation."

The practice of operant conditioning, a method of behavior modification that makes use of extrinsic motivators—or stimuli like rewards and punishments to motivate particular actions and their repetition, is based on this idea. Both intangibles and extrinsic motivators are possible.

Examples of extrinsic motivation are :

Therefore, the extrinsic motivation is not a characteristic of a creative person. So, option (B) is correct.

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In the darkest aquatic ecosystem, light cannot reach in the The open ocean .

Aquatic ecosystems, which include wetlands, rivers, lakes, and coastal estuaries, are vital to human economy and health as well as crucial components of Earth's dynamic processes.

Wetlands are the link between land and water, operating as natural filters to filter out pollutants, control flooding, and serve as cnidiaries for a variety of aquatic animals.

Estuaries, lakes, and rivers are crucial hubs for transportation, recreation, and biodiversity. Wetlands, rivers, lakes, and coastal estuaries are all aquatic ecosystems—critical elements of Earth’s dynamic processes and essential to human economies and health.

Therefore, In the darkest aquatic ecosystem, light cannot reach in the The open ocean .

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In electric circuits, amperage (current) is the flow of charge, voltage is the potential that causes this flow, and power is the rate of energy consumption or conversion. Power is calculated with the formula P = VI, indicating the direct proportionality between voltage and current, and the inverse relationship with resistance.

The relationship between amperage, voltage, and power in electric circuits is fundamental to understanding electric power.

Amperage, or current (measured in amperes), is the flow of electric charge. Voltage (measured in volts) is the potential difference that causes current to flow through a circuit. The power (measured in watts) is the rate at which electrical energy is consumed or converted into another form of energy. According to Ohm's Law, the formula to calculate power is P = VI, where P represents power, V voltage, and I current.

There is a directly proportional relationship between voltage and current in ohmic devices, meaning that if the voltage increases, the current also increases proportionally, provided the resistance remains constant. Conversely, for a fixed voltage, the current will differ depending on the resistance of the material - the lower the resistance, the higher the current. Hence, if we have two lightbulbs with different wattages operating at the same voltage, the one with a higher power rating must have a lower resistance and consequently draw more current. Increasing voltage will also increase power, which explains why a lightbulb designed for a particular voltage will burn out if connected to a higher voltage.

The electron configuration with the greatest stability is the one that follows the Aufbau principle and has completely filled energy levels or sublevels.

The electron configuration that has the greatest stability is one that follows the principle of filling up the energy levels and sublevels in a specific order. This principle, known as the Aufbau principle, states that electrons will fill the lowest energy levels and sublevels first before moving to higher energy levels and sublevels. Additionally, the electron configuration that has a completely filled sublevel or energy level is more stable due to the electron-electron repulsion being minimized.

For example, the electron configuration of the element neon (Ne) is 1s2 2s2 2p6. This configuration has a completely filled 2p sublevel and is considered more stable than a configuration with only partially filled sublevels.

Therefore, the electron configuration with the greatest stability is the one that follows the Aufbau principle and has completely filled energy levels or sublevels.

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The resistance of an electric oven's heating element that produces 5.0 kW of heat when connected to a 220 V source must be 9.68 ohms.

To determine the resistance of the heating element that produces 5.0 kW of heat when connected to a 220 V source, we use the formula for electrical power (P): P = V^2 / R, where P is power, V is voltage, and R is resistance. Rearranging the formula for resistance gives us R = V^2 / P.

Substituting the given values, we get R = (220 V)^2 / (5.0 kW), which can be further simplified as R = 48400 V^2 / 5000 W = 9.68

Therefore, the resistance of the heating element must be 9.68 ohms.

Answer: The given statement is true.

Explanation:

A change that is observable is known as a stimuli. Every individual has their own way of thinking and interpreting things.

For example, Lisa got a chocolate as a reward for completing her homework whereas his elder brother gets upset with his mom because of this.

So, in this situation Lisa will be happy as she has got a reward whereas his brother is taking this thing in a negative way by getting jealous or upset about it.

Hence, we can conclude that the statement one's perception depends on the way the brain interprets the stimuli, is true.

stress is the correct answer to this problem