A train traveling at 50m/s comes to a complete stop in 45 seconds. what was the rate of acceleration of the train?

(a) The distance of the image of the pencil from the lens is determined as 6 m.

(b) The image formed is upright, because it is magnified.

The distance of the image formed is determined by applying lens formula as shown below;

1/f = 1/v + 1/u

1/v = 1/f - 1/u

1/v = 1/2 - 1/3

1/v = (3 - 2)/6

1/v = 1/6

v = 6 m

M = v/u

M = 6/3

M = 2

A convex lens forms an upright and magnified image.

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Based on the calculations, the speed of this roller coaster at the bottom of the hill is equal to: B. 39.6 m/s.

Given the following data:

Height = 80.0 meters.

Scientific data:

Acceleration due to gravity (g) = 9.8 m/s².

In accordance with the law of conservation of energy, the potential energy possessed by the roller coaster at the top is equal to the kinetic energy possessed by the roller coaster at the bottom of the hill:

PE = KE

mgh = ½mv²

2mgh = mv²

v = √(2gh)

Substituting the given parameters into the formula, we have;

v = √(2 × 9.8 × 80)

v = √1,568

Speed, v = 39.6 m/s.

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The total thermal power generated by this plutonium source is determined as 5.65 J/s.

The total thermal power generated by this plutonium source is determined as follows;

ΔP = Eλ

where;

ΔP = (5.6 mev) x (6.3 x 10¹⁵ s⁻¹)

ΔP = (5.6 x 10³ x 1.6 x 10⁻¹⁹ J) x (6.3 x 10¹⁵ s⁻¹)

ΔP = 5.65 J/s

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The student measured the extension for five different forces rather than just measuring the extension for one force to identify anomalies. This is further explained below.

Generally, measurement is simply defined as the process of determining the size of something.

In conclusion, The student took five separate measurements of extension for various forces in order to better detect any discrepancies.

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Metals tend to readily lose electrons and form cations. Most of them react with atmospheric oxygen to form metal oxides. However, different metals have different reactivities towards oxygen (unreactive metals such as gold and platinum do not readily form oxides when exposed to air

For sodium

For Magnesium

For potassium

Answer:

Force of gravity.

So I think it's the gravity option?

Gravity keeps earth and other objects in the solar system from spinning off into outer space.

The force that pulls objects towards the center of a planet or other body is known as gravity.

Here,

Since it depicts the interaction that results when two masses are in close proximity, gravity is in fact a force. The warping of spacetime and the motion of things through the stretched spacetime are the primary causes of gravitational effects.

It appears as though a force was exerted towards the end, though.

The force that pulls objects towards the centre of a planet or other body is known as gravity. All of the planets are kept in orbit around the sun by the force of gravity.

We are confined to the surface of the Earth by gravity alone. Size, mass, density, and composition of planets are all quantifiable characteristics. The gravitational pull of a planet is determined by its size and mass.

Hence,

Gravity keeps earth and other objects in the solar system from spinning off into outer space.

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According to Newton's first law of motion, the puck gradually slows down because friction would be acting on it.

Newton's first law of motion states that an object will remain at rest or move uniformly in a straight line unless acted upon by an external force.

According to this question, a hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.

However, in accordance with the first law of motion proposed by Newton, the puck gradually slows down because friction would be acting on it.

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Answer:B. The puck gradually slows down because friction would be acting on it.

Explanation:

From the calculations, the absolute refractive index of the material is 0.6.

The refractive index is the ratio of the sine of the angle of incidence to the sine of the angle of refraction.

Having looked at the path of the travelling light wave, we can see that the absolute refractive index of the ray of light is; sine 27/sin 49 = 0.454/0.755

= 0.6

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Answer:

it is called arachnophobia

Explanation:

most reason are they way they walk and jump and the people who know they have 4 eyes

Hope This Helped i Like Spiders (^^vv^^) (spider smiley face)

Answer:

The presence of body hair seems to be significantly associated with both fear and disgust of spiders (Davey, 1991). We suggest that the rationale for this perception (fear of hairiness) is that body hair (or fur) when standing up in many mammals occur when the animal is threatened.

Explanation:

The force of the person is 68 N away from the wall.

Force is the product of mass and acceleration.

To calculate the force used by the person to push the wall, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the force of the person is 68 N away from the wall.

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The question on how electromagnets are produced that students may answer to help explain the disparities in the quantity of paper clips taken up by the electromagnets "What is the strength of  electromagnet”

The imbalance of electric charges within or on the surface of a substance, or between materials, is known as static electricity.

Static electricity is generated by Van de Graaff generators. Static does not include acceleration, implying that it is stationary, which pertains to the formation of electric charges.

a)The question on how electromagnets are produced that students may answer to help explain the disparities in the quantity of paper clips taken up by the electromagnets "What is the strength of  electromagnet”

b)The one factor, other than how the electromagnets were manufactured, that influences the quantity of paper clips the electromagnet picks up will be electrostatics.

Hence,the whole activity is about the electromagnets.

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The photography that shows a person using a type of wave technology, allows people to see very small objects clearly. D as it is a microscope

Wave technologies are important because;

Thus, the photography that shows a person using a type of wave technology, allows people to see very small objects clearly. D as it is a microscope.

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Answer:

[tex]2.8\; {\rm s}[/tex].

Explanation:

The velocity of vehicle [tex]2[/tex] relative to vehicle [tex]1[/tex] is:

[tex]\begin{aligned}& \text{velocity of 2 relative to 1} \\ =\; & (\text{velocity of 2 relative to ground}) \\ &- (\text{velocity of 1 relative to ground}) \\ =\; & 33\; {\rm m\cdot s^{-1} - 28\; {\rm m\cdot s^{-1}} \\ =\; & 5\; {\rm m\cdot s^{-1}} && (\text{to the east})\end{aligned}[/tex].

The displacement of vehicle [tex]2[/tex] relative to vehicle [tex]1[/tex] is currently [tex]0\; {\rm m}[/tex]. The rate at which this displacement increases is equal to the velocity of vehicle [tex]2\![/tex] relative to vehicle [tex]1\![/tex], which is [tex]5\; {\rm m\cdot s^{-1}}[/tex].

Thus, it would take [tex](14 \; {\rm m}) / (5\; {\rm m\cdot s^{-1}}) = 2.8\; {\rm s}[/tex] for this displacement to reach [tex]14\; {\rm m}[/tex].

Answer:

those behavioural responses that were most closely followed by a satisfying result were most likely to become established patterns and to occur again in response to the same stimulus.

Explanation:

The way Rannan made an error in his scientific process is he should not use his opinions as evidence.

A scientific experiment requires some systematic process that involves making observations and then forming his opinion about those observations.

A scientific experiment  should be guided by a known model and based on individual opinions.

Thus, the way Rannan made an error in his scientific process is he should not use his opinions as evidence.

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Answer:

Answer is B. He should not use his opinions as evidence.

Explanation:

His opinion may not be right

The kinetic energy of the air travelling at 12m/s, which passes through

the circular area in 1 second is 5.4 x 10⁵ J.

The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as

K.E = 1/2 mv²

Given the wind is blowing directly towards the wind turbine at a speed of 12 m/s. At this wind speed, 7500 kg of air passes every second through the circular area swept out by the blades.

Substitute the values, we have

K.E = 1/2 x 7500 x (12)²

K.E = 5.4 x 10⁵ J

Hence, the kinetic energy of the air travelling at 12m/s, which passes through the circular area is  5.4 x 10⁵  J.

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Answer:

150 million kilometres

Explanation:

The astronomical unit (symbol: au, or AU or AU) is a unit of length, roughly the distance from Earth to the Sun and equal to 150 million kilometres (93 million miles) or 8.3 light minutes.

It is True that A sound wave causes particles of air to travel from the source of sound (e.g., the speaker) to the listener's ear : This is because of the collision of the air particles that is caused by the wave.

A sound wave can be defined as first a mechanical wave because it needs a medium to propagate.

A sound wave is an acoustic disturbance that is caused by the movement of energy traveling through a medium that is air, water etc.

In conclusion, It is True that A sound wave causes particles of air to travel from the source of sound (e.g., the speaker) to the listener's ear : This is because of the collision of the air particles that is caused by the wave.

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Answer:

Discuss Your Presentation With an Expert

1) Skip the Stock Template.

2) Don't Use More than 6 Lines of Text.

3) Ditch the Bullet Points.

4) Use Sans Serif Fonts.

5) Size Fonts Appropriately.

6) Maintain a Strong Contrast Between Text and Background.

7) Use No More than 5 Colors.

8) Use Contrasting Text Colors to Draw Attention.

Taking into account the Boyle's law, the new pressure in the balloon is 120 000 Pa.

Boyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant.

Boyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant: if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Mathematically, this law says that if the amount of gas and the temperature remain constant, the product of pressure times volume always has the same value:

P×V= k

Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:

P1×V1=P2×V2

In this case, you know:

Replacing in the Boyle's law:

100 000 Pa×0.030 m² =P2×0.025 m²

Solving:

(100 000 Pa×0.030 m²) ÷0.025 m²= P2

120 000 Pa= P2

Finally, the new pressure in the balloon is 120 000 Pa.

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(a) The time it takes for the police officer to catch up to the speeding car is determined as 0.31 s.

(b) The speed of the police officer  at the time he catches up to the driver is 136.8 km/h.

The time taken for the police to catch up with the driver is calculated as follows;

v = at

where;

t = v/a

t = 37.5/3.278

t = 11.4 seconds

(v1 - v2)t = ¹/₂at² --- (1)

(v1 - v2)t = v1²/2a --- (2)

From (1):

(v1 - 37.5)t = ¹/₂(3.278)t²

(v1 - 37.5)t = 1.639t²

v1 - 37.5 = 1.639t

v1 = 1.639t + 37.5  -----(3)

From (2):

(v1 - 37.5)t = v1²/(2 x 3.278)

(v1 - 37.5)t = 0.153 ----- (4)

solve 3 and 4;

(1.639t + 37.5 - 37.5)t = 0.153

1.639t² = 0.153

t² = 0.0933

t = 0.31 s

v1 = 1.639(0.31) + 37.5 = 38 m/s = 136.8 km/h

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Considering the definition of velocity, the average velocity of Ben is 0.3 [tex]\frac{meters}{second}[/tex].

Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction.

Because the speed also considers the direction in which the displacement of an object occurs, it is considered a vector magnitude.

So, the velocity can be defined as the amount of space traveled per unit of time with which a body moves, considering the direction, and can be calculated using the expression:

[tex]velocity=\frac{distancetraveled}{time}[/tex]

Velocity has units of [tex]\frac{distance}{time}[/tex], such as [tex]\frac{meters}{second}[/tex] or [tex]\frac{meters}{minute}[/tex], and includes direction of travel.

Ben walks 500 meters from his house to the corner store. He then walks back toward his house, but continues 200 meters past his house to talk to a neighbor.

So, you know:

Replacing in the definition of velocity:

[tex]velocity=\frac{300 meters}{1020 seconds}[/tex]

Solving:

velocity= 0.3 [tex]\frac{meters}{second}[/tex]

Finally, the average velocity of Ben is 0.3 [tex]\frac{meters}{second}[/tex].

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Answer:

the potential energy a massive object has in relation to another massive object due to gravity

Answer:

PE uses the acceleration of gravity in its calculation definition

Explanation:

Potential Energy = mass * acceleration of gravity * height

Heating and Cooling Using Geothermal Heat, Natural Air Conditioning. Another use of this type of energy is natural cooling.Maintenance of Civil Works. Another direct application is to avoid the freezing of bridges, roads, or airports. .Thermal Waters. For the use of heat in hot springs from geothermal energy, deep waters with temperatures between 40 and 150 ° C are used.

Answer:

increasing the inertia of the car

The ratio of the area of the plunger to the area of the piston will be 0.2323.

The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.

It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.

The presure at the output remains the same

[tex]\rm P_0=P_I \\\\\ \frac{F_0}{A_o} =\frac{F_I}{A_I} \\\\ \frac{A_0}{A_I} = \frac{F_0}{F_I} \\\\ \frac{A_0}{A_I} =\frac{39}{1675} \\\\ \frac{A_0}{A_I} =0.2323[/tex]

Hence, the ratio of the area of the plunger to the area of the piston will be 0.2323.

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Answer:

0.6

Explanation:

Angular acceleration is equal to Net Torque divided by rotational inertia, which is the rotational equivalent to Newton’s 2nd Law.  Therefore, angular acceleration is equal to 3.6/6 which is 0.6. Hope this helped!

Answer:

It loses potential energybut gains kinetic energy.

Explanation:

The student 4 measurement has the largest percent error. The discrepancy between the calculated value and the correct value is referred to as an "error" in statistics.

An error is a mistaken or erroneous action. In some contexts, an error is interchangeable with a mistake.

The complete question is

'Four students measured the acceleration of gravity. The accepted value for their location is 9.78m/s2. Which student’s measurement has the largest percent error?

A. Student 4: 9.61 m/s2

B. Student 3: 9.88 m/s2

C. Student 2: 9.79 m/s2

D. Student 1: 9.78 m/s2"

The percentage error is found as;

[tex]\rm \% error = \frac{a_A-a_E}{a_E} \times 100[/tex]

The percentage error in the gIven four students is obtained by putting the values in the given problem;

Student 1 ;

[tex]\rm \% error = \frac{9.78-9.78}{9.88}\times 100 \\\\\ \% error = 0 \%[/tex]

Student 2 ;

[tex]\rm \% error = \frac{9.78-9..79}{9.79}\times 100 \\\\\ \% error = - 0.10 \%[/tex]

Student 3 ;

[tex]\rm \% error = \frac{9.78-9.88}{9.88}\times 100 \\\\\ \% error = - 1.01 \%[/tex]

Student 4 ;

[tex]\rm \% error = \frac{9.78-9.61}{9.61}\times 100 \\\\\ \% error =1.77\%[/tex]

Student 4 reports the maximum percentage error.

Hence the student 4 measurement has the largest percent error.

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The velocity of the wind relative to the cyclist is determined as -15.3 km i - 3.5 km j.

The speed of the wind in x - direction and y - direction is calculated as follows;

v(w/c) = - 5 km(cos 45)i - 5km(sin45)j

v(w/c) = [- 3.5 i - 3.5 j ] km

velocity of wind with respect to cyclist = (-12 km i - 3.5 km i) - 3.5 km j

velocity of wind with respect to cyclist = -15.3 km i - 3.5 km j

Thus, the velocity of the wind relative to the cyclist is determined as -15.3 km i - 3.5 km j.

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