In a cinema theatre, why do we normally not hear echoes even though the sounds are loud?​

Answer:Let m =  mass of asteroid y.Because asteroid y has three times the mass of asteroid z, the mass of asteroid z is m/3.Given:F = 6.2x10⁸ Nd = 2100 km = 2.1x10⁶ mNote thatG = 6.67408x10⁻¹¹ m³/(kg-s²)The gravitational force between the asteroids isF = (G*m*(m/3))/d² = (Gm²)/(3d²)orm² = (3Fd²)/G     = [(3*(6.2x10⁸ N)*(2.1x10⁶ m)²]/(6.67408x10⁻¹¹ m³/(kg-s²))    = 1.229x10³² kg²m = 1.1086x10¹⁶ kg = 1.1x10¹⁶ kg (approx)Answer: 1.1x10¹⁶ kg

Explanation:

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The Correct choice is ~

The relative humidity of saturated (cloudy) air is 100%.

When the air is saturated, it contains the maximum amount of water vapor that it can hold at a given temperature and pressure. The relative humidity is a measure of how much moisture is present in the air compared to the maximum amount it can hold at that temperature.

At 100% relative humidity, the air is holding as much water vapor as it can, and any further increase in moisture content would result in condensation or the formation of clouds. In other words, the air is fully saturated with water vapor, leading to cloud formation.

Therefore, the relative humidity of saturated (cloudy) air is 100 percent.

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The radius of the cylindrical channel of the thermometer capillary is 1.8 mm.What is a capillary?A capillary is a tube that has a very small internal diameter. The name of the tube is derived from its thin, hair-like appearance. A capillary is a tube with an internal diameter of less than 0.8 mm and a wall thickness of approximately 0.1 mm.

The capillary's radius can be calculated using the given formula The capillary's volume can be calculated using the following formula:Here, r is the radius of the capillary and h is the height of the mercury column which is equal to 40 mm³The formula for the volume of a cylinder is:

Thus, the volume of the mercury column in the capillary tube will be equal to 251.32741228719 mm³. The radius of the cylindrical channel of the thermometer capillary is 1.8 mm. A capillary is a tube that has a very small internal diameter. The name of the tube is derived from its thin, hair-like appearance. A capillary is a tube with an internal diameter of less than 0.8 mm and a wall thickness of approximately 0.1 mm.

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Answer:

The box gains 3200 J of kinect energy.

Explanation:

Kinect energy is the energy of an object has because of its motion. Almost anything that has mass and it's in motion has kinect energy. Examples:

Also known as the principle of work and kinect energy, it states that the work done by all forces acting upon an object equals the change of its kinect energy.

For example, if you pull a box, then you're exerting a force on it and it moves forward. Since the box has mass and it's in motion, you have changed its kinect energy.

Solution:

Write the data down:

\(\bullet \quad \mathsf{m=50\,kg}\\\\\bullet \quad \mathsf{F=400\,N}\\\\\bullet \quad \mathsf{d=8\,m}\)

Apply work energy theorem:

\(\mathsf{W}= \Delta\mathsf{K}\)

The amount work done equals the change of kinect energy:

\(\mathsf{W}=\mathsf{K-K_o}\)

Since the block is at rest at the beginning, so it has zero initial kinect energy:

\(\mathsf{W}=\mathsf{K-0}\\\\\\\mathsf{W}=\mathsf{K}\)

Now, apply the formula for work to the left hand side of the equation:

\(\mathsf{F\cdot d}=\mathsf{K}\\\\\\\mathsf{400\cdot 8}=\mathsf{K}\\\\\\\therefore \boxed{\mathsf{K=3200\,J}}\)

Conclusion: the box has gained 3200 J of kinect energy.

Happy studying!

Brainly Team

Both have temperature differences due to differences in their heat capacities and thermal conductivities.

There is a temperature difference between sand and water because they have different heat capacities and thermal conductivities.

Water has a higher heat capacity, meaning it can absorb more heat before its temperature increases, while sand has a lower heat capacity.

Additionally, water has a higher thermal conductivity, meaning it can transfer heat more efficiently than sand. These differences in thermal properties cause sand and water to heat up and cool down at different rates, resulting in temperature differences between them.

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The maximum velocity of the object is 0.0272 m/s, and the kinetic energy it has at that point is 3.76 × 10⁻⁶ J.

The maximum velocity of the object and the amount of kinetic energy it has at that point can be found using the given values. Here's the step-by-step solution: Given data: Mass of the object, m = 0.0100 kg Force constant of the spring, k = 1.3 N/m Displacement of the object, d = 3.00 cm = 0.0300 m We know that the maximum velocity of the object can be determined using the following formula: v = ±√(2K/m)where, K = Potential Energy and m = mass of the object. The potential energy of the system can be obtained using Hooke's law.

According to Hooke's law, F = -k x Where, F = restoring force k = force constant x = displacement of the object from the equilibrium position. By using the above formula, we can find the force acting on the object. F = k x'. Force acting on the object, F = 1.3 N/m × 0.0300 m = 0.039 N. The restoring force is acting in the opposite direction of the displacement of the object. So, the force acting on the object is negative, i.e., F = -0.039 N. Now, we can calculate the potential energy of the system. K = (1/2)kx²K = (1/2) × 1.3 N/m × (0.0300 m)²K = 5.85 × 10⁻⁵ J By using the above value of potential energy and mass of the object, we can calculate the maximum velocity of the object. v = ±√(2K/m)v = ±√[(2 × 5.85 × 10⁻⁵ J) / 0.0100 kg]v = ±0.0272 m/s.

The maximum velocity of the object is 0.0272 m/s (rounded off to four significant figures).Now, we can calculate the amount of kinetic energy the object has at that point by using the following formula. Kinetic energy, K = (1/2)mv²where m = 0.0100 kg and v = 0.0272 m/s K = (1/2) × 0.0100 kg × (0.0272 m/s)²K = 3.76 × 10⁻⁶ J. The amount of kinetic energy the object has at its maximum velocity is 3.76 × 10⁻⁶ J (rounded off to three significant figures).So, the maximum velocity of the object is 0.0272 m/s, and the kinetic energy it has at that point is 3.76 × 10⁻⁶ J.

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Answer:

The dependent variable

Explanation:

This is because this variable depends on what happens during the experiment.

The formula you are referring to is the centripetal acceleration formula, which represents the acceleration required to maintain an object in circular motion. The formula is:

a = v^2/r

where a is the centripetal acceleration, v is the speed of the object, and r is the radius of the circular path.

The direction of the centripetal acceleration is always towards the center of the circle, which allows the object to follow the curved path. This is known as centripetal force, and it is provided by a force acting on the object towards the center of the circle. Examples of such forces include tension in a string, gravity, and friction.

It is important to note that the object's speed must remain constant for it to stay in circular motion. This means that any change in speed will cause the object to leave the circular path. The direction of the velocity, however, is constantly changing, as it is always directed tangent to the circle at any point along the path.

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The properties that can be observed from the use of telescope and other instruments include colour, parallax angle, spectral type, apparent brightness. The things that are inferred indirectly are luminosity, surface temperature, mass and radius.

A binary star is a system of two stars that are gravitationally bound to orbit around each other. Binary system in the night sky that are seen as a single object using the eye are often resolved using a telescope as separate stars known as visual binaries.

However, we can measure a star's mass directly if it is a member of an eclipsing binary system.  

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Answer:

Explanation:

Fe₂O₃ + 3C ---> 2Fe + 3CO

1 mole                          3 moles

From the balanced equation above , we see that , 1 mole of Fe₂O₃ reacts with carbon to form 3 moles of CO .

So , 4 moles of  Fe₂O₃ will react with carbon to form 3 x 4  moles of CO .

moles of CO formed = 3 x 4 moles = 12 moles.

Answer:

A. crushing the solid .

Answer:

A.) crushing the solid

Power is needed for (1) acceleration and (2) lifting the loaded chairs. These two parts can be calculated separately and then added together.

(1) Power for acceleration:

The final speed of the lift is

V=(10 km/h)(1 h×1000 m60 sec×1 km)=2.887 m/s.

Then the power needed is

Pa=12m(V2−V20)/Δt=12(50×250 kg)(2.778 m/s)2=9.6 kW.

(2) Power for lift

Assume that the acceleration is constant (i.e. power supply is constant), its value will be

a=ΔVΔt=2.778 m/s5 s=0.556 m/s2.

Then the vertical lift during acceleration will be

(12at2)×(2001000)=1.36 m.

Hence, the power needed to increase the potential energy of the lift is

Pg=mgΔhΔt=(50×250 kg) (9.89 m/s2)(1.36 m)/(5 s)=3.41 kW.

Then the total Power required is

Ptotal=Pa+Pg=9.6+34.1=43.7 kW.

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Answer:The continuity equation for a compressible liquid is a mathematical expression that relates the changes in fluid density, velocity, and volume to the changes in time. This equation can be written as:

∂ρ/∂t + (ρv)•∇ = 0

where:

ρ = fluid density

v = fluid velocity

∂/∂t = partial derivative with respect to time

∇ = del operator

The continuity equation expresses the principle of mass conservation, stating that the rate of change of fluid density in a fixed volume must be equal to the rate of flow of fluid into or out of that volume. This equation is commonly used in fluid dynamics to study the behavior of liquids and gases in various applications, such as in pipelines, pumps, valves, and compressors.

Explanation:

Answer:

rbeta=rearth

Explanation:

khan

Planet Beta has 2 times the gravitational field strength and 2 times the mass of the Earth.

How does the radius of planet Beta compare with the radius of Earth?

Answer: CORRECT (SELECTED

rBeta = rEarth

47,000 written as 4.7 x 104 in s scientific notation

Answer:

Cuba, Jamaica, Dominican Republic, Haiti, Turks & Caicos, and The Bahamas

Explanation:

Answer:

Cuba, Jamaica, Dominican Republic, Haiti, Turks & Ciacos & Bahamas's.

Answer:

The outline of the energy transfer are;

a) Kinetic energy → Clockwork spring → Potential energy

b) Potential energy in clockwork car → Clockwork spring coil unwound → Clockwork car run

c) Chemical potential energy → Batteries in the car → Electric motors → Kinetic energy

Please find attached the drawings of the energy transfer created with MS Visio

Explanation:

The energy transfer diagrams are diagrams that can be used to indicate the part of a system where energy is stored and the form and location to which the energy is transferred

a) The energy transfer diagram for the winding up a clockwork car is given as follows;

Mechanical kinetic energy is used to wind up (turn) the clockwork car such that the kinetic energy is transformed into potential energy and stored in the wound up clockwork as follows;

Kinetic energy → Clockwork spring → Potential energy

b) Letting a wound up clockwork car run results in the conversion of mechanical potential energy into kinetic (energy due tom motion) energy as follows;

Potential energy in clockwork car → Clockwork spring coil unwound → Clockwork car run

c) The energy stored in the battery of a battery powered car is chemical potential energy. When the battery powered car runs, the chemical potential energy produces an electromotive force which is converted into kinetic energy as electric current flows from the batteries

Therefore, we have;

Chemical potential energy → Batteries in the car → Electric motors → Kinetic energy

Answer:

Hello!

I could help you on this ^^

Explanation:

Newton’s Third Law of Motion states, “When one object exerts a force on a second object, the second one exerts a force on the first that is equal in magnitude and opposite in direction.”

-This law is sometimes called the “Law of Action and Reaction”.

-Even though the forces are equal in magnitude (strength) and opposite in direction, they do not cancel each other.

This law addresses two objects, each with only one force exerted on it.

-Each object is exerting one force on the other object.

-Each object is experiencing only one force.

The action and reaction forces are reciprocal (opposite) on an object.

Examples may include:

A swimmer swimming forward:

The swimmer pushes against the water (action force), the water pushes back on the swimmer (reaction force) and pushes her forward.

A ball is thrown against a wall:  

The ball puts a force on the wall (action force), and the wall puts a force on the ball (reaction force) so the ball bounces off.

A person is diving off a raft:

The person puts a force on the raft (action force) pushing it, and the raft puts a force on the diver (reaction force) pushing them in the opposite direction.

A person pushes against a wall (action force), and the wall exerts an equal and opposite force against the person (reaction force).

(Not my words)

"The Space Shuttle engines push out hot gases (action force), and the hot gases put a force on the shuttle engines (reaction force) so the shuttle lifts (there is no sling shot doing it)"

B) mostly empty space themselves. The atoms in a granite block are arranged in a crystal lattice structure, with the individual atoms spaced relatively far apart from each other.

This means that, despite the solid appearance of the block, the majority of the volume is actually empty space correctly arranged in a crystalline structure, which means that the atoms are arranged in a highly ordered pattern. While it may seem like the block is a solid mass, the reality is that the atoms themselves are separated by small amounts of space, which means that the block is mostly empty space. To understand this concept better, it's important to remember that atoms are not solid spheres, but rather they consist of a nucleus that is surrounded by a cloud of electrons. The electrons occupy a relatively large amount of space compared to the size of the nucleus. Additionally, there is also space between the atoms themselves. In the case of granite, which is a type of igneous rock, the atoms are arranged in a specific crystalline structure that gives the rock its strength and durability. However, even in this tightly packed structure, there is still space between the atoms, which means that the rock is mostly empty space.

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Answer:

engaging in more exercise

Explanation:

Maladaptive means not providing an adequate or appropriate adjustment to the environment or situation. Therefore the question is asking which is Not a bad way to respond to stress.

Answer:

w=120rpm        

Considering  it  a  disc

L=Iw

=220×(412)×120×602π

=31.415kgm/s

The angular velocity of wheel should be considered as the 31.415kgm/s  when the mass of wheel is 500 and the diameter is 500 revolutions per minute.  

Since  

So here

We know that

w = 120rpm        

And,

L = Iw

So,

= 220×(412)×120×602π

= 31.415kgm/s

hence, The angular velocity of wheel should be considered as the 31.415kgm/s.

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Yes, according to Newton's third law of motion, for every action, there is an equal and opposite reaction.

When you step off a ledge, you apply a force on the Earth due to gravity, and by Newton's third law, the Earth applies an equal and opposite force on you. The magnitude of the force on the Earth is the same as the force on you, but because the Earth is so much more massive than you, its acceleration is negligible.

However, technically speaking, the Earth does accelerate toward you, but the acceleration is so small that it is usually ignored.

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Answer:25

Explanation:

Formula(77°F − 32) × 5/9 = 25°C

Answer: The answer is C. 298 K

Explanation:

Answer:

Explanation:

i know don't  sorry remove my answer if you want to :(

Answer:

B

Explanation:

Answer:

b the motion of molecules

Explanation:

i just took the test and it makes the most sense

In alpha decay, the nucleus loses two protons, in beta decay, the nucleus either loses or gains a proton whereas in gamma decay, no change in proton number occurs only energy is released.

Alpha decay is a type of radioactive decay in which the nucleus of an atom emits an alpha particle which leads to transforming into a new atomic nucleus by losing two protons. During beta decay, the proton in the nucleus is transformed into a neutron and and neutron is transformed into proton while on the other hand, gamma decay is a type of decay in which nucleus changes from a higher energy state to a lower energy state due to the release of electromagnetic radiation.

So we can conclude that In alpha decay, the nucleus loses two protons, in beta decay, the nucleus either loses or gains a proton whereas in gamma decay, no change in proton number occurs only energy is released.

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