An iceberg is 3,000 metres from a submarine. The submarine emits ultrasound. How long until the submarine detects the iceberg?

Answer:

Increase friction

Explanation:

The others would make the object move faster

Answer:

C. precipitation

Explanation:

if clouds store too much water from evaporation, it will rain which is precipitation

Answer:

Heat refers to the energy transferred from a hotter object to a cooler one. Heat is transferred in three ways: radiation, conduction, and convection. ... The direct transfer of heat from one substance to another substance that it is touching is called conduction.

Explanation:

Answer:

ϟ [tex] \huge{ \boxed{ \purple{ \text{Simple \: Machine}}}}[/tex]

⤥ We use different types of devices in our life to make our work easier. A spade is used to dig , a broom is used to sweep , a hammer is used to pass a nail on the wall and a plank is used to drag a load up to a certain height. All these simple things or devices , which are used in our daily life are called simple machines. Such simple machines do not do our work themselves but we have to use force on them to work with them. Thus , Simple machines are those tools or devices which make our work easier and convenient to do in the direction of force.

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Explanation:

a simple machine is a device having simple structure which makes our work is a faster and more convenient.

hope it helps

Answer:

b. Comfortable pair of athletic shoes.

Explanation:

Analyzing the information and the options, the fitness product that would most assist Sergio in reaching his weight loss goals would be the pair of comfortable sports shoes, which he could use to do running exercises.

For beginning practitioners it is ideal to start exercising with short 30-minute walks until the body adapts and you gain physical conditioning and endurance.

Running has the advantage of being an excellent exercise that can be practiced anywhere, and helps in the production of dopamine, which produces a feeling of well-being and also helps in reducing hunger, in addition to working and strengthening various muscle groups in the body, activate blood circulation, decrease anxiety, improve cholesterol levels, control blood pressure, etc.

Answer:

b. Comfortable pair of athletic shoes.

Explanation:

Answer:

potential energy decreases

kinetic energy increases

Answer:

hope it helps...

Explanation:

Both the water in the ocean and the air in the atmosphere exert pressure because of their moving particles. ... This causes greater pressure. Denser fluids such as water exert more pressure than less dense fluids such as air. The particles of denser fluids are closer together, so there are more collisions in a given area.

Answer:

the velocity is 1.67 m/s

Explanation:

The computation of the velocity of the arrow/ice combination after the collison is shown below:

Here the law of conservation is applied

[tex]p_i = p_f\\\\m_av_a+m_b+v_b= (m_a + m_b)v[/tex]

Here

[tex]m_a = 2.0 kg\\\\v_a = 10m/s\\\\m_b = 10 kg\\\\v_b = 0[/tex]

Now

[tex]v = \frac{m_av_a+ m_bv_b}{m_a + m_b} \\\\= \frac{(2.0kg) (10 m/s) + 0}{2.0kg + 10.0kg}[/tex]

= 1.67 m/s

hence, the velocity is 1.67 m/s

Answer:

4761J

Explanation:

Given parameters:

Mass of the ball  = 18kg

Velocity before it hits the water below = 23m/s

Unknown:

Kinetic energy of the ball  = ?

Solution:

Kinetic energy is the energy due to the motion of a body. It is mathematically expressed as:

  Kinetic energy  = [tex]\frac{1}{2}[/tex] m v²  

m is the mass

v is the velocity

 So;

  Kinetic energy  =  [tex]\frac{1}{2}[/tex]  x 18 x 23²  = 4761J

The term used when heat is transferred from one piece of matter to another until they are of equal temperature is equilibrium so, option C is correct.

Heat is energy that is transmitted from one body to another when temperatures are different. When two bodies of different temperatures are brought together, energy is exchanged, or heat flows, from the hotter body to the colder.

An increase in the temperature of the colder body and a reduction in the temperature of the hotter body is typical, though not always, the results of this energy transfer.

The system (or collection of systems) is said to be in thermal equilibrium when these temperatures equalize and heat no longer flows through them. The absence of substance flowing into or out of the system is another implication of thermal equilibrium.

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Answer:

Atoms cannot move.

Explanation:

Explanation:

Mass = m

Velocity = v

If Mass is increased 4 times = 4m

New velocity = 2v

Kinetic Energy

[tex] \frac{1}{2}m {v}^{2} [/tex]

So it will be 1/2 × 4m × 2v × 2v

[tex]8m {v}^{2} [/tex]

so Kinetic Energy will increase 4 times

Answer:

Astronomical location of Mount St. Helen's is 46°12′01″N 122°11′22″O, meaning that such statovolcano is located at middle latitudes. In middle latitudes, troposphere is 17 kilometers high, which is below stratosphere, whose height is 10 kilometers at middle latitudes. Hence, the eruption of Mount St. Helen's in 1980 contiminated troposphere and lower parts of stratosphere due to volcanic ash.

Explanation:

Astronomical location of Mount St. Helen's is 46°12′01″N 122°11′22″O, meaning that such statovolcano is located at middle latitudes. In middle latitudes, troposphere is 17 kilometers high, which is below stratosphere, whose height is 10 kilometers at middle latitudes. Hence, the eruption of Mount St. Helen's in 1980 contiminated troposphere and lower parts of stratosphere due to volcanic ash.

Explanation:

The buoyant force must be greater to float, otherwise it would sink, its like a barrel in water, the more water weight in it the more it sinks, the more air weight the more it rises.

The change that should arise at the time when an atom undergoes alpha decay is that nucleus loses mass and a new element is produced.

It is the type of radioactive decay where the atomic nucleus should be emitted an alpha particle and due to which it transforms and it should be distinct atomic nucleus.

Therefore we can say that The change that should arise at the time when an atom undergoes alpha decay is that nucleus loses mass and a new element is produced.

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Answer:

6 m/s^2

Explanation:

Answer:

a = 7.4 m / s²

Explanation:

The centripetal acceleration of an object that has constant speed is

         a = v² / r

linear and angular velocity are related

         v = w r

let's substitute

         a = w² r

the angular velocity is related to the period

        w = 2π / T

we substitute

        a = [tex]\frac{4\pi ^2 \ r}{T^2}[/tex]

let's calculate

        a = 4π²  3.00 /4²

        a = 7.4 m / s²

Answer:

C. 4.0 J

Explanation:

Work is equal to the change in kinetic energy or kinetic energy final - kinetic energy initial. 1/2 mv^2 is the equation for kinetic energy. SInce the mass is the same, you don't have to include it when solving. 1/2 times 1^2 = 1/2. 1/2 times 3^2 = 4.5. 4.5 - 0.5 = 4 J

Answer:

The approximate velocity the rocket must have to stop the asteroid completely after the collision is;

C. -324 m/s

Explanation:

The parameters of the asteroid and the rocket are;

The mass of the asteroid, m₁ = 11,000 kg

The initial velocity with which the asteroid is approaching Earth, v₁ = 50 m/s

The mass of the rocket, m₂ = 1700 kg

The initial velocity of the rocket = v₂

The final velocity of the combined asteroid and rocket after the collision, v₃ = 0 m/s

By the law of conservation of linear momentum, we have;

The total initial momentum = The total final momentum

m₁·v₁ + m₂·v₂ = (m₁ + m₂)·v₃

Substituting the known values, we get;

11,000 kg × 50 m/s + 1,700 kg × v₂ = (11,000 kg + 1,700 kg) × 0 m/s

11,000 kg × 50 m/s + 1,700 kg × v₂ = 0

∴ 1,700 kg × v₂ = -11,000 kg × 50 m/s

v₂ = (-11,000 kg × 50 m/s)/(1,700 kg) = -323.529412 m/s ≈ -324 m/s

The approximate initial velocity the jet must have to completely stop the asteroid after the collision is -324 m/s.

Explanation:

Because they evolved rapidly, and moulted like other arthropods,trilobites serve as excellent index fossils, enabling geologists to date the age of the rock in which they are found

Answer:

Nitrous oxide

Nitrous oxide, often called laughing gas, makes a serious impact on the Earth.

Answer:

can be called kinetic or potential energy

Explanation:

Answer:

In physics we say that work is done on an object when you transfer energy to that object. If one object transfers (gives) energy to a second object, then the first object does work on the second object. Work is the application of a force over a distance. ... Energy can be defined as the capacity for doing work.

Answer:

Explanation:

Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks

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Answer:

Kinetic energy is the energy due to motion. Potential energy is energy stored in matter. The joule (J) is the SI unit of energy and equals (kg×m2s2) ( kg × m 2 s 2 ) .

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Answer:

250 m/s

Explanation:

Answer:

250m/s

Explanation:

Frequency = velocity/wavelength

Then rearrange,

Velocity = frequency x wavelength

Velocity = 500 x 9.5 = 250m/s