Which of the rays drawn above would be correct as the light goes from the air into the water?

A, B, or C ??

Answer:

New force, F' = 2.33 N

Explanation:

It is given that,

A physicist found that a force of 0.72 N was measured between two charged sphere.

The distance between the spheres was, d = 0.9 m

We have to find the force between the two sphere when the distance was decreased to d' = 0.5 m

The force acting between two charged particles is given by :

[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]

i.e. F is inversely proportional to the square of distance between the charges. Let F' is the force when distance is decreased.

So, [tex]\dfrac{F}{F'}=(\dfrac{d'}{d})^2[/tex]

[tex]\dfrac{0.72}{F'}=(\dfrac{0.5}{0.9})^2[/tex]

On solving, we get : F' = 2.33 N

Hence, on decreasing distance the force between the charges increases.

The runner's acceleration is -2 m/s², indicating deceleration at a rate of 2 meters per second squared over a period of 2 seconds.

The acceleration of a runner who goes from 6 m/s to 2 m/s in 2 seconds can be calculated using the formula for acceleration which is Δv/Δt, where Δv is the change in velocity and Δt is the change in time. In this case, Δv = final velocity - initial velocity = 2 m/s - 6 m/s = -4 m/s (the negative sign indicates deceleration). The time interval Δt is 2 seconds. Thus, acceleration a is calculated as:

a = Δv/Δt = (-4 m/s)/2 s = -2 m/s².

This indicates that the runner is decelerating at a rate of 2 meters per second squared.

m₁ = mass of sample of copper = m₂ = mass of sample of aluminum = 5 g

T = initial temperature of copper = initial temperature of aluminum

T₁ = final temperature of copper

T₂ = final temperature of aluminum

c₁ = specific heat of copper = 0.09 cal/g°C

c₂ = specific heat of aluminum = 0.22 cal/g°C

Since both receive same amount of heat, hence

Q₁ = Q₂

m₁ c₁ (T₁ - T) = m₂ c₂ (T₂ - T)

(5) (0.09) (T₁ - T) = (5) (0.22) (T₂ - T)

T₁ - T = (2.44)  (T₂ - T)

Change in temperature of copper = (2.44) change in temperature of aluminum

hence the correct choice is

c. The copper will get hotter than the aluminum.

Answer: c. The copper will get hotter than the aluminum.

Explanation: Specific heat capacity of a substance is the amount of heat required to raise the temperature of 1 gram of water through [tex]1^0C[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T[/tex]

m= mass

c = specific heat

[tex]\Delta T[/tex] = change in temperature

Given : [tex]Q_{Cu}=Q_{Al}[/tex]

mass of copper = mass of Aluminium= 5 g

[tex]c_{Cu}\times \Delta T_{Cu}=c_{Al}\times \Delta T_{Al}[/tex]      

Now put all the given values ,  we get

[tex]0.09\times \Delta T_{Cu}=0.22\times \Delta T_{Al}[/tex]

Thus as specific heat capacity of copper is less, the temperature change will be more as they both are at same initial temperature.

Answer:

B. Greater energy

Explanation:

Fast moving water is very energetic as its can displace very large rocks, boulders and make pebbles and sand out of them through the process r erosion. Fast moving water have kinetic energy, it opposes anything that come in its way. As river make its own channel by eroding plane. Many antecedent rivers have make their channel by cutting large mountains too.

The find the final speed of the 2.0-kilogram body is 65 m/s towards east.

To find the final speed of a 2.0-kilogram body initially traveling at 40 meters per second east, we will use the following physics concepts:

Newton's Second Law of Motion: F = ma, where F is the force, m is the mass, and a is the acceleration.

Kinematic Equation: vf = vi + at, where vf is the final velocity, vi is the initial velocity, a is the acceleration, and t is the time.

Step 1: Calculate the acceleration.

Using F = ma, we can solve for a:

F = 10 N

m = 2.0 kg

So, a = F/m = 10 N / 2.0 kg = 5 m/s²

Step 2: Calculate the final velocity using the kinematic equation.

Initial velocity, v_i = 40 m/s

Acceleration, a = 5 m/s²

Time, t = 5 s

So, vf = vi + at

[tex]v_f = 40 \, \text{m/s} + (5 \, \text{m/s}^2 \times 5 \, \text{s}) = 40 \, \text{m/s} + 25 \, \text{m/s} = 65 \, \text{m/s}[/tex]

Therefore, the final speed of the body is 65 meters per second east.

The bending of wave crests as they reach shallow water is called refraction, occurring alongside shoaling, which results in increased wave heights. Refraction is caused by the variation in wave speed due to different water depths. When waves become too tall relative to their wavelength, they break, often curling forward.

The bending of wave crests as they reach shallow water is known as refraction. This phenomenon occurs because different segments of the wave crest experience changes in wave speed due to the varying depths of water they encounter. The sections of a wave crest in deeper water travel faster compared to those in shallower water, causing the wave to bend and tend to align more parallel to the shoreline. As waves reach shallow water, there is also an increase in wave height due to the shoaling effect, where the energy of the wave is compressed into a smaller volume of water. The process of waves becoming more asymmetric and experiencing changes in their crest and trough structure is a result of both shoaling and refraction.

Moreover, when a wave 'touches bottom' in shallow water, the friction causes the wave to slow down and the wavelength to decrease while the wave height increases. When the wave height becomes too high relative to the wavelength, the wave becomes unstable and forms a breaker. The top part of the wave moves faster than the bottom, due to less friction encountered by the seafloor, often resulting in a forward curling motion as the wave breaks.

Answer:

Answer D: It describes the relationship between motion and force.

Explanation:

The answer is D because a law is something that describes something in nature, but does not try to explain how or why is occurs (that is a theory). Options B and C sound more like theories, while option A sounds like a definition. Option D is correct because a law describes without explaining.

Final answer:

The correct statement about Newton's first law of motion is that it describes the relationship between motion and force. While related, the second law quantitatively establishes the cause and effect between force and changes in motion.

Explanation:

When examining Newton's laws of motion, it is important to understand the specific insights they provide about force and motion. Newton's first law of motion, often called the law of inertia, states that an object at rest will stay at rest, and an object in motion will remain in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Given the options, the most accurate statement about Newton's first law of motion is:

D. It describes the relationship between motion and force.

Newton's second law of motion complements the first by providing a mathematical expression of the relationship between force, mass, and acceleration. This law is crucial because it quantifies the cause and effect of forces on objects and allows us to make predictions about how an object will move when a force is applied.

it becomes a magnet.

Carrie is making a presentation on solar winds. Her notes of the steps that must occur for solar winds to form are given then the correct sequence in the formation of solar winds would be 3 ⇒2⇒4⇒1.

The energy transferred from the Sun in the form of electromagnetic radiation is known as the solar energy

It can be used as thermal energy for various life purposes as well as for electricity conversion with the help of solar photovoltaic cells,

As given in the problem Carrie is making a presentation on solar winds. Her notes of the steps that must occur for solar winds to form are below

1. The stream of electrically charged particles collides with gas atoms, causing the latter to give off light.

2. The electrically charged particles flow outward in all directions as far as Saturn.

3. The stream of electrically charged particles flows outward from the corona.

4. The particles of the solar wind flow along lines of the magnetic field.

Thus, the correct sequence in the formation of solar winds would be 3 ⇒2⇒4⇒1.

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By definition, we have that the displacement of the object is given by:

[tex] r = \int\limits^t_0 {v} \, dt [/tex]

Where,

v: object velocity

dt: time differential

Therefore, since the integral of a function is the area under the curve of the function, then in a graph of velocity vs time, we have that the displacement is:

The area under the curve of the velocity vs. time graph.

Answer:

to calculate the displacement of the object we have to calculate:

The area under the curve of the velocity vs. time graph.

The elastic constant of the wire is about 470 N/m

[tex]\texttt{ }[/tex]

Let's recall Elastic Constant formula as follows:

[tex]\boxed{k = \frac{E A}{L}}[/tex]

where:

k = elastic constant ( N/m )

E = Young's Modulus ( Pa )

A = cross-sectional area ( m² )

L = initial length ( m )

Let us now tackle the problem!

[tex]\texttt{ }[/tex]

Translation:

A wire, with cross sectional area A = 5 mm² and length L = 32 cm, is stretched by a force. Assuming that Young's modulus of wire E = 3 × 10⁷ N/m², calculate the elastic constant k of the wire !

Given:

cross sectional area = A = 5 mm² = 5 × 10⁻⁶ m²

length of wire = L = 32 cm = 0.32 m

Young's modulus of wire = E = 3 × 10⁷ N/m²

Asked:

elastic constant of wire = k = ?

Solution:

[tex]k = \frac{E A}{L}[/tex]

[tex]k = \frac{ (3 \times 10^7) \times (5 \times 10^{-6})}{0.32}[/tex]

[tex]k = 468.75 \texttt{ N/m}[/tex]

[tex]k \approx 470 \texttt{ N/m}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Elasticity

Newton's first law of motion states that an object remains at rest unless a(n) external force acts on it.

Newton's first law can be defined as if an object is at rest it remains at rest, or if in motion, remains in motion which has a constant velocity unless acted on by a net external force.

The equation for Newton’s first law is as follows:

F = dp /dt

or

F = d(mv)/dt

In this statement, p is the momentum. As p=mv, the second equation replaces p with mv. V is the object’s velocity, t is the time, and F is for force.

Newton's first law can also be called as the law of inertia because inertia refers to the amount of resistance of an object can be related to a velocity change. Here, Velocity change can be described in terms of the speed of the object or its direction.

When we known with the different part of inertia is the tendency to continue which moves in the same direction line at a constant speed when no forces act on them. Thus, it can be described as an object remains at rest unless an external force acts on it.

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Final answer:

Newton's first law of motion, or the law of inertia, indicates that an object at rest stays at rest and an object in motion maintains its velocity unless acted on by a net external force.

Explanation:

Newton's first law of motion, also known as the law of inertia, states that an object remains at rest or if in motion, continues to move at a constant velocity unless acted upon by a net external force. This principle explains why an object will not change its state of motion unless a force is applied to it. For example, a soccer ball on the ground will not move until a player kicks it, applying a net external force to overcome its inertia.

Answer:  

Light from star would take 100 years to reach the Earth.

Explanation:

1 light year can be defined as the distance which light travels in one year in space.

1 light year = speed of light × 1 year

1 light year = 9.46 × 10¹⁵ m

A star at a distance of 1 light year means that observer on earth would see the first light from the star after 1 year.

If a star is located 100 light years from the Earth, the light from the star will reach the Earth in 100 years.

Answer:

sea floor spreading

Explanation:

I got it right on studyisland

The term that best describes the geologic event taking place in the above illustration is seafloor spreading. The correct option is D.

The magma forces itself upward more dramatically when the seafloor spreads slowly. As a result, mountain ranges and cliffs become taller and more dramatic. The process by which crustal plates—large cubes of Lithospheric plates from one another is known as seafloor spreading.

As the tectonic plates move away from one another, they pull the seafloor with them, causing fractures and cracks to form. During this time, hot magma would bubble up and quickly fill in the cracks, causing the seafloor to move. This is demonstrable because magnetism on the ocean floor indicates that it formed in this manner.

Therefore, the correct option is D. seafloor spreading.

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The question is incomplete. Your most probably complete question is given below: The image is added.

Answer:

52.2%

Explanation:

Efficiency= output temperature/ input temperature

output temperature= input temperature-exhaust temperature

so, 653 K - 312 K = 341 K

341 K / 653 K = 52.2%

I got the answer correct on the online quiz.

The velocity of car 2 from the frame of reference of car 1 will be 10 mph.

The change of distance with respect to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.

The given data in the problem is

The velocity of car 1, V₁ = 20 mph south

The velocity of car 2, V₂ = 30 mph north

From the frame of reference of car 1, the velocity of car 2 will be V₁₂

From the frame of reference of car 1, the velocity of car 2 will be;

V₁₂=V₂ - V₁

V₁₂= 30 mph - 20 mph

V₁₂= 10 mph

Hence, the velocity of car 2 from the frame of reference of car 1 will be 10 mph.

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The incorrect statement about seasons is A. Earth's proximity to the Sun does not cause the seasons; it is the tilt of Earth's axis that causes seasons. The question's primary focus is on dispelling the misconception that Earth's distance from the Sun determines seasonal changes.

The statement that is not true of the seasons is A. The Earth is closer to the sun during the summer and farther away from the sun during the winter. In fact, the Earth's distance from the Sun varies only by about 3%, which is not significant enough to cause the seasons. Moreover, during the Northern Hemisphere's winter in December, Earth is actually closest to the Sun. The seasons are instead caused by the Earth's 23.5-degree tilt on its axis, leading to varying angles and durations of sunlight exposure for different parts of the world as the Earth orbits the Sun.

The tilt causes one hemisphere to be more directly exposed to the Sun's rays, making it summer there, while the other hemisphere receives less direct sunlight and thus experiences winter. This is why the Southern and Northern Hemispheres have opposite seasons. Additionally, summer does not start on the same day in every country, and during the summer, days are indeed longer due to the tilt of the Earth.

The system gains energy and the sign of w is positive if work is done on it. According to the principle of energy conservation, every change in the system's energy must take into account both the energy it has received and lost. Thus, option B is correct.

An interaction with its environment causes a system's internal energy to decrease. The internal energy of a system grows when work is done on it.

The energy change from work always takes place as part of a process, much like the energy change from heat: a system can perform work, but it doesn't contain work.

Therefore, when the system makes an impact on the environment, we characterize work as being positive (energy leaves the system). The work is negative if it is done to the system (energy added to the system).

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