A girl throws a marshmallow that lands in her friend’s mouth 2 m away. The girl threw the marshmallow at an angle of 30 degrees. How hard did she throw the marshmallow?

The best example of Newton's third law of motion is, When a passenger stepped from a boat to the shore, the boat moved away from the shore. Thus, option C is correct.

Sir Issac Newton gives three laws of motion. The first law states that an object remains at rest or in continuous motion unless an external force acted on it. The second law stated that the force is directly proportional to the acceleration of the object. Newton's third law states that, for every action, there is an equal and opposite reaction.

From the given, Newton's third law is applicable, When a passenger stepped from a boat to the shore, the boat moved away from the shore. This shows the action and reaction of the boat and shore.

Thus, the ideal solution is option C.

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Answer:

of the net electric field at point P due to the two charges.

Explanation:

Answer:

D Constant velocity

Explanation:

if it has forces moving on it it has constant velocity

Tina's speed as she passes David is 25.0 m/s, which is the same as David's speed. To solve this problem, we can use the kinematic equations of motion:

Position as a kinematic equations of time: x = x0 + v0t + (1/2)at^2

Final velocity as a function of time: v = v0 + at

First, let's find out how long it takes for Tina to catch up to David. We can use the second equation above to find the time it takes for Tina to reach David's speed:

v = v0 + at

25.0 m/s = 0 + 2.60 m/s^2 * t

t = 9.62 s

Now we can use the first equation to find how far Tina travels during that time:

x = x0 + v0t + (1/2)at^2

x = 0 + 0 + (1/2)(2.60 m/s^2)(9.62 s)^2

x = 120.3 m

Therefore, Tina drives 120.3 meters before passing David. To find her speed as she passes David, we can use the second equation above:

v = v0 + at

v = 0 + 2.60 m/s^2 * 9.62 s

v = 25.0 m/s is the final velocity.

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Answer:

For a given system, there can be particular transformations for which the explicit equations of motion are the same for both the old and new variables. Transformations for which the equations of motion are invariant, are called invariant transformations. It will be shown that if the Lagrangian does not explicitly contain a particular coordinate of displacement  qi, then the corresponding conjugate momentum,  pi, is conserved. This relation is called Noether’s theorem which states “For each symmetry of the Lagrangian, there is a conserved quantity".

Taking into account the definition of kinetic energy, the velocity of the object with a kinetic energy of 250 J and a mass of 32 kg is 3.95 m/s².

Kinetic energy is the energy possessed by a body or system due to its movement.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed. Once the final speed is reached, the amount of kinetic energy accumulated will remain constant, that is, it will not vary, unless another force acts on the body again.

Kinetic energy is represented by the following expression:

Ec = 1/2×m×v²

Where:

In this case, you know:

Replacing in the definition of kinetic energy:

250 J = 1/2× 32 kg×v²

Solving:

250 J÷ (1/2× 32 kg) = v²

15.625 J÷kg = v²

√15.625 J÷kg = v

3.95 m/s² = v

Finally, the velocity of the object is 3.95 m/s².

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Answer:

The frequency of light can be calculated using the formula:

`c = λv`

Where `c` is the speed of light in a vacuum, `λ` is the wavelength of light, and `v` is the frequency of light.

The speed of light in a vacuum is `3.00 × 10^8 m/s`.

To convert the wavelength from nanometers to meters, we need to divide by `1 × 10^9`.

Thus, the frequency of light with a wavelength of 655 nm is:

`v = c/λ`

`v = (3.00 × 10^8 m/s)/(655 × 10^-9 m)`

`v = 4.58 × 10^14 Hz`

Therefore, the frequency of light with a wavelength of 655 nm is `4.58 × 10^14 Hz`.

Similarly, the frequency of light with a wavelength of 515 nm is:

`v = c/λ`

`v = (3.00 × 10^8 m/s)/(515 × 10^-9 m)`

`v = 5.83 × 10^14 Hz`

Therefore, the frequency of light with a wavelength of 515 nm is `5.83 × 10^14 Hz`.

Finally, the frequency of light with a wavelength of 475 nm is:

`v = c/λ`

`v = (3.00 × 10^8 m/s)/(475 × 10^-9 m)`

`v = 6.32 × 10^14 Hz`

Therefore, the frequency of light with a wavelength of 475 nm is `6.32 × 10^14 Hz`.

So, the frequency of light with a wavelength of 655 nm is `4.58 × 10^14 Hz`, the frequency of light with a wavelength of 515 nm is `5.83 × 10^14 Hz` and the frequency of light with a wavelength of 475 nm is `6.32 × 10^14 Hz`.

Answer:

The answer is 50 watts

Explanation:

The formula of power is work done over elapsed time

P= W/t
P= 550 J / 11 sec

P= 50 watts

The approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

To approximate the heat transfer through the air layer in the double-paned window, we can assume that the glass layers have a negligible impact on the heat flow. The heat transfer can be calculated using Fourier's Law of Heat Conduction, which states that the heat flow (Q) is proportional to the temperature difference (ΔT) and inversely proportional to the thickness (L) and thermal conductivity (k) of the material.

First, we need to calculate the effective thermal conductivity of the air layer due to its thickness and the thermal conductivity ratio between air and glass. Let's denote the thermal conductivity of air as k_air and the thermal conductivity of glass as k_glass. Since glass has a thermal conductivity roughly 36 times greater than air, we have k_glass = 36 * k_air.

Next, we calculate the effective thermal conductivity of the air layer as:

k_eff = (k_air * L_air) / (L_air + k_glass)

Substituting the given values, we have:

k_eff = (k_air * 0.0165 m) / (0.0165 m + 0.005 m) = 0.01309 * k_air

Now, we can calculate the heat flow per second through the air layer using the formula:

Q = (k_eff * A * ΔT) / L_air

Substituting the given values, we get:

Q = (0.01309 * k_air * 0.760 m^2 * 23.0 K) / 0.0165 m = 24.4 J/s

Therefore, the approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

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Answer:

Troposphere

Explanation:

The troposphere happens to be the lowest region amongst the atmosphere. It has a length that extends from the surface to a height of about 6–10 km. And that is the lower boundary of the stratosphere among the layers of the atmosphere

The troposphere in itself is bonded on the top by a layer of air tropopause. This layer is the one which separates the troposphere from the stratosphere, and on bottom by the surface of the Earth.

ISPs play a vital role in providing internet access to individuals and businesses, which in turn helps them to stay connected, communicate, and access information, making them an essential part of the modern digital world.

An ISP, or Internet Service Provider, plays a crucial role in enabling individuals and businesses to access the internet. Its primary function is to provide internet connectivity to its customers, which can be done through various technologies such as DSL, cable, fiber, satellite, or wireless.
ISPs not only provide internet connectivity but also offer different types of internet plans that cater to different user needs, ranging from basic internet access to high-speed broadband connectivity with added features such as security, email, and web hosting services.
ISPs also allocate unique IP addresses to their customers, which enable them to access and communicate on the internet. They also manage and maintain the network infrastructure required to provide internet connectivity, such as servers, routers, switches, and cables.
In addition to providing connectivity, ISPs may also offer additional services such as virtual private network (VPN) services, cloud storage, and online backup solutions.
Overall, ISPs play a vital role in providing internet access to individuals and businesses, which in turn helps them to stay connected, communicate, and access information, making them an essential part of the modern digital world.

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Answer:

The moving object transfers kinetic energy with the object that isn't moving.

Explanation:

Kinetic energy is a form of energy that a object  or particle has by the reason of motion. Potential energy is a form of energy that a object or particle has by the reason of no movement. The object that is moving knocks down or collides with an object that isn't  moving, and the object that is moving transfers kinetic energy to potential energy, and the object that wasn't moving transfers potential energy to kinetic energy.

Answer:

C. Muddy Water

Answer:

it is double the temperature change of iron

Answer:

States of matter

Explanation:

hopefully that's correct :)

Answer:

Scientists use the term the "state of matter" when comparing the properties of solid, liquid, and gases.

Explanation:

Wycleff is on block 1, Lilly is on block 4, Emilia is on block 12, and Quincy is on block 17 is the correct statement about each person standing at block.

As a source and observer move closer or farther apart, the Doppler effect, which is a phenomenon in physics, causes the frequency of sound, light, or other waves to rise or fall. When a source emits waves, those waves are compressed as they approach the observer.

Wycleff could hear a low-pitched sound the entire time, indicating that the police car was relocating away from him. He was thus in block 1.

A Doppler effect (change in pitch) was the first thing Lilly noticed. She was at block 4, so the car must have passed her first.

After Lilly, Emilia noticed a Doppler effect. She was at block 12 when the car passed Lilly before passing her.

The entire time, Quincy heard a high-pitched sound, which indicated that the police car was approaching. He was thus in block 17.

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Answer:

The reason that the nucleus of most atoms does not fall apart despite the oppositely charged protons exerting a repulsive force on each other is the strong nuclear force.

The strong nuclear force is one of the fundamental forces in nature that acts between protons and neutrons in the atomic nucleus. It is a short-range force that is much stronger than the electromagnetic force (which produces the repulsion between protons).

The strong nuclear force is responsible for holding the nucleus together.

Additionally, the ratio of protons to neutrons in a nucleus also affects its stability. Therefore, if there is an imbalance in this ratio, the repulsive force between the protons can become too strong, causing the nucleus to become unstable and undergo radioactive decay.

Overall, the nucleus remains stable due to the balance between the strong nuclear force and the repulsive force between the protons.

Answer:

1) The force per egg caused by the weight of the block is 17.15 N

2) \(A= 0.686\ mm^2\)

Explanation:

Pressure

The pressure is computed as the force acting upon a surface divided by the area of the surface :

\(P=\frac{F}{A}\)

The weight of an object of mass m is:

W = mg

Where g is the gravitational acceleration of \(9.8\ m/s^2\)

The cement block has a mass of m=14 kg, thus its weight is:

W = 14*9.8

W = 137.2 N

1) This weight is evenly distributed over the 8 eggs, thus the force per egg is:

F = 137.2 N/8= 17.15 N

The force per egg caused by the weight of the block is 17.15 N

2) It's given the pressure on each egg as \(P= 25 \ N/mm^2\) and we know the force acting on each one is F=17.15 N. To find the contact area we solve the formula of the pressure for A:

\(\displaystyle A=\frac{F}{P}\)

\(\displaystyle A=\frac{17.15}{25}\)

\(\mathbf{A= 0.686\ mm^2}\)

Answer:

Since the two forces are represented by Fap and For, we can assume that Fap refers to the force applied by your hand on the dog while petting it, and For refers to the equal and opposite force applied by the dog's body on your hand.

The diagram showing your hand petting a dog would look something like this:

```

____

/ \

/ \

/ D \

/ \

/____________\

H

```

In this diagram, the force Fap is represented by an arrow pointing from your hand towards the dog's body, and the force For is represented by an arrow pointing in the opposite direction, from the dog's body towards your hand.

We can describe the two forces as follows:

- Fap: The force applied by your hand on the dog's body while petting it.

- For: The equal and opposite force applied by the dog's body on your hand, according to Newton's third law of motion.

Answer:

c

Explanation:

in food and batteries chemical energy is stored :) hope this helped

Answer:

The characteristics that determine how easily two substances change temperature are:

The volume and density of the substances and the amount of time they are in contact do not directly affect how easily they change temperature.

Explanation:

The two evidence are the car's engine gets hot as it burns gasoline are the car remains full of gasoline if its engine stays off.

The car's engine gets hot as it burns gasoline and the car remains full of gasoline if its engine stays off are the two pieces of evidence support the conclusion that the total amount of energy in a close system remains the same because when the gasoline burns, the engine gets hotter and when the car remains full of gasoline if its engine stays off which means no energy leaves the system.

So we can conclude that The two evidence are the car's engine gets hot as it burns gasoline are the car remains full of gasoline if its engine stays off.

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a student rises their 15 kg back pack from the floor at a constant velocity of 5.0 m/s then they apply of 37.5 N of force.

Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s². There are two types of forces, balanced force and unbalanced force.

In this problem student rises 15 kg of backpack at constant velocity and it happens in 2s, so consider time t = 2s.

Force is change in velocity with respect to time multiplied by mass.

F = m dv/dt

F = 15 kg × 5.0 m/s/2s

F = 37.5 N

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Answer:

it is 3 times greater, because 30=3x10

❖ Your marble has a mass of 5.0g. What is its mass in kilograms? (Remember to include your units. Given: 1kg=1000g)

— — — — — — — — — —

— To calculate the mass in grams into kilograms, we just need to divide the given mass in grams by 1000 (since 1kg is equivalent to 1000 g).

_______________∞_______________

An electron in a Hydrogen atom goes from the n=3 energy level to the n=1 energy level by emitting light. The energy of this light is (E)= 19.38×10⁻¹⁹ J.

Energy is a physical term. If a object is affected by some forces and move a distance that means object has some energy. It can be measured in Joule.

To calculate the energy we are using the formula,

E= hc/λ

To calculate the energy we have to calculate the wavelength= λ  first, we are using the formula,

1/λ=R[(1/n₁²)-(1/n₂²)]

Here we are given,

R= the Rydberg constant.=1.097×10⁷ /m

n₁= the final energy level.=1

n₂= the initial energy level.=3

we have to calculate the wavelength. = λ m

Now we put the values in above equation we get,

1/λ=R[(1/n₁²)-(1/n₂²)]

Or, 1/λ= 1.097×10⁷×[(1/1²)-(1/3²)]

Or,  1/λ= 1.097×10⁷×[(1/1)-(1/9)]

Or,  1/λ=0.975×10⁷ /m

Now we put the value in first equation, we get

E= hc/λ

Here we are given,

h=  the Planck's constant.= 6.626×10⁻³⁴ J.s

c= The speed of light.= 3×10⁸ m/s

we have to calculate the energy. = E J

Now we put the values in above equation,

E= hc/λ

Or, E= 6.626×10⁻³⁴×3×10⁸×0.975×10⁷

Or, E= 19.38×10⁻¹⁹ J

From the calculation we can say that, The energy of this light is (E)= 19.38×10⁻¹⁹ J.

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If the universe were to suddenly begin shrinking rather than continuing to expand, it would have a significant effect on the cosmic microwave background radiation (CMB).

The CMB is the afterglow of the Big Bang and is observed as a nearly uniform background radiation in all directions. It is thought to have been emitted when the universe was about 380,000 years old and had cooled enough for neutral atoms to form.

If the universe were to suddenly begin shrinking, the photons in the CMB would lose energy as they travel through the contracting space. This would cause the CMB radiation to shift to shorter wavelengths, which is known as blue-shifting.

Therefore, the correct answer is B. It would blue-shift.

Answer:

option d - "the gas is lighter than air"

Explanation:

Based on the given experiment, the most likely conclusion is that the gas collected in the balloon is lighter than air, which causes the balloon to rise. Therefore, option d - "the gas is lighter than air" is the correct answer.

It is not possible to conclude whether the gas is poisonous, hydrogen, or hot because these properties cannot be determined solely from the given experiment. Additionally, it is not safe to assume that the collected gas will explode when touched with a match, as this would depend on the specific properties of the gas collected.

Explanation:

Here is the first one....you should try the second one...