7. What causes waves to bend?

Answer: a= 1.77 m/s²

Explanation: acceleration is expressed in:

a= vf - vi / t

a= 18.8 m/s - 0 m/s / 10.6 s

a= 1.77 m/s²

Answer:

h = 2.5m

Explanation:

₈₈ Ra²²⁸ → ₂He⁴ + ₈₆Rn²²⁴

Explanation:

Radium -228 is a radio-active element. It undergoes ∝- decay which means it emits a helium particle that is composed of 2 neutrons and 2 protons. Then the radium- 228 is converted into radon-224 which is again a radio-active element contains 86 protons and 138 neutrons by emitting an ∝-particle. The other isotopes of Ra²²³, Ra²²⁴ and Ra²²⁶ occurs naturally in the chain decay of the radio-active elements Uranium and Thorium. The ∝- decay of ₈₈ Ra²²⁸ is given as,

₈₈ Ra²²⁸ → ₂He⁴ + ₈₆Rn²²⁴  

Answer:

Socrates believed that one as a matter of fact must concentrate more on self development than on material things. He encouraged people to engage in developing friendships and love among themselves.

Answer:

B. (Mind and body are inseperable).

Explanation:

Sedimentary rock changes when it is exposed to extreme heat and pressure, but it can be caused by tectonic plate movement ( for heat ) and when the collide, you get the pressure.

Hope this helps, if not, comment below please!!!!

Sedimentary rock changes when it is exposed to extreme heat and pressure, but it can be caused by tectonic plate movement ( for heat ) and when the collide, you get the pressure.

Hope this helps, if not, comment below please!!!!

Answer:

i) kinetic friction; ii) The friction force always acts in the opposite direction to the movement of the surface where friction exists.

Explanation:

Part i )

At that time the type of friction that exists is kinetic, as there is movement by the wheel. At the moment when the wheel remains in rest over the inclined plane, the friction force which would be used will be the static force.

Part ii)

The friction force always acts in the opposite direction to the movement of the surface where friction exists. It is not opposed to the sense of movement. In order for the wheel to rise on the inclined plane, it must turn to the right, that is to say in the clockwise direction, therefore the friction force must go in the opposite direction to the rotation of the wheel, that is to say, go in the opposite direction to the movement of the surface under friction effect, that is why it points in the same direction of displacement of the wheel.

Answer:

Explanation:

Magma is a molten and semi-molten rock mixture found under the surface of the Earth. This mixture is usually made up of four parts: a hot liquid base, called the melt; minerals crystallized by the melt; solid rocks incorporated into the melt from the surrounding confines; and dissolved gases. When magma is ejected by a volcano or other vent, the material is called lava. Magma that has cooled into a solid is called igneous rock. Magma is extremely hot—between 700° and 1,300° Celsius (1,292° and 2,372° Fahrenheit). This heat makes magma a very fluid and dynamic substance, able to create new landforms and engage physical and chemical transformations in a variety of different environments. How Magma Forms Earth is divided into three general layers. The core is the superheated center, the mantle is the thick, middle layer, and the crust is the top layer on which we live. Magma originates in the lower part of the Earth’s crust and in the upper portion of the mantle.

Molted magma comes outside Earth's surface and formed igneous rocks. Due to natural decay, this igneous rocks forms sedimentary rocks and due to  changes  of temperature, pressure and chemical changes both of the rocks transforms into metamorphic rocks.

A fundamental idea in geology, the rock cycle illustrates how the three primary types of rocks—sedimentary, metamorphic, and igneous—change over the course of geologic time.

When a rock is pushed out of its equilibrium circumstances, it changes. For instance, an igneous rock like basalt may disintegrate and evaporate when exposed to air or melt when it is subducted beneath a continent.

Rocks do not stay in an equilibrium state; rather, they change as they interact with new environments because of the driving forces of the rock cycle, plate tectonics, and the water cycle.

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Answer: Scientists used relative dating and absolute dating.

Explanation:

Scientists used absolute dating to determine the actual number of years ago that events happened. They used relative dating to divide Earth's past into several time frames when similar organisms were on Earth.

This is used by scientists to measure time and events during Earth's history.

Answer : Geologic Time

Answer: acceleration is equal to the change in velocity per unit time in seconds.

a= ∆v / t = vf - vi / t

Explanation: change in velocity or ∆v can be expressed as (vf - vi)

A designation of 100000 volts is a need for greater caution. The voltage is a unit of the potential different by which a given amount.

Answer:

A ratio of equivalent units

Explanation:

A conversion factor is a ratio of equivalent units and depends on which units are to be converted.

For example we want to convert 275 [mm] to inches, so we have to find the right conversion factor to allow us to work that conversion.

275 [mm] = inches = ?

[tex]275 [mm] * \frac{1in}{25.4mm} = 10.82 [in][/tex]

In this case the ratio is 1/25.4 = 0.039 [in/mm]

1)The average acceleration of eagle is 1.75 m/s².

2) The average acceleration of roller coaster is 6 m/s².

3)Acceleration in m/s² is 4 m/s².

4) Acceleration required to stop the car is -17.9 m/s².

5) Acceleration required to stop the car is -8.78 m/s².

6) Acceleration of the plane is 2.87 m/s².

7)Acceleration of the sled is 243 m/s².

Answer:

Explanation:

1) Average acceleration is equal to the rate of change in velocity with respect to time. Here the final and initial velocities are given as 22 m/s and 15 m/s respectively and the time is given as 4 seconds.

So, average acceleration = (Final velocity-Initial velocity)/Time

Average acceleration = (22-15)/4= 1.75 m/s².

Thus, the average acceleration of eagle is 1.75 m/s²

2) Similarly we have to use the above formula for determining the average acceleration of the roller coaster. Here the initial velocity is 4 m/s and final velocity is 22 m/s and the time taken to reach this final speed is 3 seconds.

So, average acceleration = (Final velocity-Initial velocity)/Time

Average acceleration = (22-4)/3= 6 m/s².

Thus, the average acceleration of roller coaster is 6 m/s².

3) Acceleration = 26.8/6.7=4 m/s².

Acceleration in m/s² is 4 m/s².

4) Acceleration required to stop the car = -35.8/2=-17.9 m/s².

Acceleration required to stop the car is -17.9 m/s².

5) Acceleration of the car skidding to stop = (0-22.4)/2.55=-8.78 m/s².

Acceleration required to stop the car is -8.78 m/s².

6) Acceleration of the plane= 88.3/30.8=2.87 m/s².

Acceleration of the plane is 2.87 m/s².

7) Acceleration of the sled = 444/1.83=243 m/s².

Acceleration of the sled is 243 m/s².

The eagle's average acceleration is equal to 1.75 [tex]m/s^2[/tex].

Given the following data:

An acceleration can be defined as the rate of change of the velocity of an object with respect to time. Also, it is usually measured in meter per seconds square.

Mathematically, acceleration is given by this formula:

[tex]a = \frac{V\;-\;U}{t}[/tex]

Where:  

Substituting the given parameters into the formula, we have;

[tex]a = \frac{22\;-\;15}{4}\\\\a=\frac{7}{4}[/tex]

Acceleration, a = 1.75 [tex]m/s^2[/tex].

Note: You should use the above formula to solve the other exercises.

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Answer:

C) Electronegativity

Perception involves more than just sensory input; it includes interpretation by the brain, as evidenced by the existence of optical illusions, philosophical arguments, and conditions like synesthesia which demonstrate complex brain functions involved in perceiving the world.

The concept that there is more to perception than what our senses can detect is supported by a variety of evidence. It is important to realize that perception is a cognitive process that involves interpreting sensory information, rather than just receiving it passively. The phenomenon of illusions serves as evidence that perception can lead to misinterpretation of sensory inputs. For example, optical illusions often show that what we perceive does not always match the physical reality of what we are sensing, suggesting that our brain is involved in constructing our experiences of the world to a greater degree than we might assume.

Philosophers like Russell and Moore highlight that our beliefs about the world are mediated through and sometimes limited by our sensory experiences, which are subject to error due to limitations or malfunctions in our sense organs or interpretations by the brain. G.E. Moore’s argument about the evidence of a hand existing simply because we can perceive it without further proof is an example of direct realism and points to our reliance on perception for evidence of the external world, yet acknowledges that there is a degree of trust involved in the acceptance of sensory evidence. Furthermore, the concept of homeostasis and allostasis in relation to emotions and reason, shows that our state of mind and body can influence how we interpret sensory information.

Interestingly, the existence of phenomena like synesthesia, where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway, suggests that perception is not purely a direct function of the senses, but can involve more complex brain functions that combine different types of sensory data into unique perceptual experiences that are not directly linked to the external stimuli.

The resultant vector is 11√2 km due north east.

The vector is a type of quantity which has both magnitude and direction. This quantities when expressed needs to specify both magnitude and direction.

We need to calculate the magnitude and direction separately.

Here firstly for the magnitude,

The magnitudes are both 11 km and they are at right angles to each other.

So, the resultant magnitude = √(11² +11²) km

=11√2 km

Now for the direction, one vector is due north and the other is due east.

So the resultant vector is due north east.

So the final vector is 11√2 km due North-East.

Explanation:

Let the distance covered by the body be s, initial and final velocities be u and v respectively and time taken be t.

[tex] \therefore Average\: velocity = \frac{u+v}{2} \\\\ Now, \:we \:know\: that\\\\ Distance \:covered\\ = Average\: velocity \times time\\\\ \therefore s= \frac{(u+v) }{2} \times t..... (1)\\\\[/tex]

By first equation of motion:

[tex] v = u + at[/tex]

Substituting the value of v in equation (1), we find:

[tex] s= \frac{(u+u + at)}{2} \times t\\\\ \therefore s= \frac{(2u + at)}{2} \times t\\\\ \therefore s= \frac{(2ut + at^2)}{2}\\\\ \therefore s= \frac{2ut} {2}+ \frac{at^2}{2}\\\\ \huge \orange {\boxed {\therefore s= ut+ \frac{1}{2}at^2}} \\\\[/tex]

Hence proved.

Answer:

unbalanced force

Explanation:

i just did it.

Two forces acting opposite each other then the acceleration is caused if one force is greater in magnitude than the other.

A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull.

A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton (N). Force is represented by the symbol F (formerly P).

The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. If the mass of the object is constant, this law implies that the

Acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object.

Hence Two forces act opposite each other then the acceleration is caused if one force is greater in magnitude than the other.

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0.12244898 is the value obtained when solving the given.

Explanation:

Given:

3 times 10 to the 8th power can be expressed in equation format as [tex]3 \times 10^{8}[/tex] (3 times symbolizes ‘multiplication’ then it is to the tenth power of 8)

2.45 times 10 to the 9th power can be expressed in equation format as [tex]2.45 \times 10^{9}[/tex] (2.45 times symbolizes ‘multiplication’, then it is to the tenth power of 9)

Asked to find the solution when dividing the above,

                 [tex]\frac{3 \times 10^{8}}{2.45 \times 10^{9}}=\frac{3}{2.45} \times 10^{8-9}[/tex]

When the tenth power of any value goes from denominator to numerator and vice-versa, presents in opposite sign to that it possess (like when ‘[tex]10^{9}[/tex] ' goes to numerator changed as ' [tex]10^{-9}[/tex] ').

Now by solving the above equation, we get

                [tex]\frac{3}{2.45} \times 10^{8-9}=1.22 \times 10^{-1}=\frac{1.22}{10}=0.12244898[/tex]

Answer:462400joules

Explanation:

Mass=m=800kg velocity=v=34m/s

Kinetic energy=(m x v^2)/2

Kinetic energy =(800x34^2)/2

Kinetic energy =(800x34x34)/2

kinetic energy =924800/2

Kinetic energy =462400joules

In a scientific investigation, hypotheses best are tested through experimentation because the result of the experiment confirms the validation of the theoretical hypothesis formed while framing the problem statement, therefore the correct answer is option B.

Scientific investigation is the process of looking for answers by doing extensive research and finding the answers through experimental results.

The greatest way to test a hypothesis in scientific research is through an experiment since the outcome validates the theoretical hypothesis made while defining the issue statement.

Thus, the correct answer is option B.

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C₇H₁₆+11O₂⇒7CO₂+8H₂O

Answer:

Sound waves strike a glass and cause it to shatter. This illustrates what phenomenon? the angle at which a wave strikes a reflective medium (the angle of incidence, or theta_i) is equal to the angle at which a wave reflects off the medium (the angle of reflection)

Answer:

The image will most likely be 20cm in front the mirror since the mirror was placed further 5cm.

Answer:

Acceleration = 3.5 [m/s^2]

Explanation:

We can solve this problem using Newton's second law, which states that the sum of forces on a body is equal to the product of the mass by the acceleration

F = 350 [N]

m = 100 [kg]

Using Newton's second law we have:

F = m*a

where:

F = force [N]

a = acceleration or desacceleration [m/s^2]

therefore:

a = 350/100

a = 3.5 [m/s^2]

Answer:

it would be 86725.1 m

Explanation:

please give brainly

Answer: 53.9ml/hr = 24.1m/s

Explanation:

Since 1ml = 1609m

And 1hr = 3600sec

53.9ml/hr = 53.9*1609/3600

= 24.1m/s

Answer:

D- Water in the Pacific Ocean has more thermal energy and a lower temperature.

Explanation:

The Pacific Ocean had much more quantity compared to a cup of hot coffee.

The cup of coffee has a higher temperature due to direct heating, although the Pacific Ocean has more thermal energy because of its great mass.

Explanation:

The initial horizontal speed is 39 m/s, and the initial vertical speed is 0 m/s.

v₀ₓ = 39 m/s

v₀ᵧ = 0 m/s

In the y direction:

Δy = 73 m

v₀ᵧ = 0 m/s

aᵧ = 9.8 m/s²

Find: t

Δy = v₀ᵧ t + ½ aᵧt²

73 = 0 + ½ (9.8) t²

t = 3.9 s

In the x direction:

v₀ₓ = 39 m/s

aₓ = 0 m/s²

t = 3.9 s

Find: Δx

Δx = v₀ₓ t + ½ aₓt²

Δx = (39) (3.9) + 0

Δx = 150 m

The initial horizontal speed of the cannonball is 39 m/s, its initial vertical speed is 0 m/s, it remained in the air for approximately 3.86 seconds, and it landed about 150.3 meters from the base of the building.

The cannonball's initial horizontal speed is the speed at which it was fired, which is 39 m/s. Since the cannonball was fired horizontally, its initial vertical speed is 0 m/s.

To find out how long the ball was in the air, we need to use the equation of motion. With the use of the formula for the time of flight for a vertically projected body (t = √(2h/g)), where h is the height from which the cannonball was dropped, and g is the acceleration due to gravity, which is 9.8 m/s², we get t = √(2*73/9.8) = 3.86 seconds.

Finally, to find the distance along the ground, we multiply the time in the air by the horizontal speed (because the horizontal velocity stays consistent in a vacuum), so we get 39 m/s * 3.86 seconds = 150.3 meters.

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Answer:Quantitative experiments show that 4.18 Joules of heat energy are required to raise the temperature of 1g of water by 1°C.

Explanation:

Answer:

F = -1.682 i + 3.374 j [N] ; F = 3.77[N]; α = 65.78°

Explanation:

In order to be able to understand this problem more easily, we will have to draw the vectors at the point of origin and in this way, with the help of the angles we will be able to find each of the components of the forces.

Looking at the attached image we can see each of the three forces, take each force and decompose them into the x & y axes.

F1 = 5.81 [N]

[tex]F_{1x} = 5.81*cos(77) = 1.306[N]\\F_{1y} = 5.81*sin(77) = 5.66[N][/tex]

F2= 4.88 [N]

[tex]F_{2x}= - 4.88*cos(180-156) =-4.458[N]\\F_{2y}= 4.88*sin(180-156) =1.984[N][/tex]

F3= 4.52 [N]

[tex]F_{3x} = 4.52*cos(360-289)=1.47[N]\\F_{3y} = - 4.52*sin(360-289) = -4.27[N][/tex]

Now we can sum each of the forces in the different components

[tex]F_{x} =F_{x1}+F_{x2}+F_{x3} = 1.306-4.458+1.47 = - 1.682[N]\\F_{y} =F_{y1}+F_{y2}+F_{y3} = 5.66+1.984-4.27 = 3.374[N][/tex]

F = -1.682 i + 3.374 j [N]

The total magnitude can be calculated by Pythagoras theorem

[tex]F = \sqrt{(1.682)^{2}+(3.374)^{2} } \\F = 3.77 [N][/tex]

The direction can be calculates as follows:

tan(α) = 3.374/1.682

α = 65.78°

This angle was calculated with respect to the horizontal