Physics High School

## Answers

**Answer 1**

**Answer:**

[tex]F=5.4 N[/tex]

**Explanation:**

Given:

[tex]k=45N/m\\x=12*10^\power{-2}m\\[/tex]

From Hook's law

[tex]F= kx\\F=45*12*10^\powe{-2}\\F=5.4 N[/tex]

## Related Questions

An experimental device imparts a force of magnitude F = 40 lb to the front edge of the rim at A to simulate the effect of a slam dunk. Compute the moment of the force F about point O and about point B. The moments are positive if counterclockwise, negative if clockwise. Finally, locate a point C from the base at O to the location on the ground where the force imparts zero moment. The distance d from point O to point C is positive if C is to the right of O, and negative if to the left.

### Answers

**Please see attached picture for answer an explanation.**

The **moment of force **about point O, is determined from the product of **force **and perpendicular **distance**

**What is moment of force?**

The** moment of a force** about a given point is the **torque **exerted by the applied force on the object. The **moment of force** is determined from the product of force and perpendicular distance of the applied force.

P = Fd

where;

P is the moment of forceF is the applied forced is the distance of the force

Thus, the **moment of force **about point O, is determined from the product of **force **and perpendicular **distance**.

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You have 263 mL liquid mercury, What is the mass of mercury that you have

### Answers

**Answer:**

**the mass of a mercury with volume of 263mL = 3559.3 g or 3.56 kg**

**Explanation:**

given:

263 mL liquid mercury

find:

What is the mass of mercury

we know that the density of mercury = 13.5336 g/mL.

now, calculate the mass = volume x density

plugin values into the formula

mass = 263 mL x 13.5336 g/mL.

mass = 3559.3 g or 3.56 kg

therefore,

**the mass of a mercury with volume of 263mL = 3559.3 g or 3.56 kg**

what is the unit of destiny what are the basic unit involve in it

### Answers

Ok so the unit of density is kg/m^3

The basic unit involved are kg which is weight of the body and m^3 which is the area of the body

What is the cow's average velocity to reach the apples?

### Answers

Answer:1.). -0.65

2.). 0.65

Explanation:

Which occupation is not an example of specialization?

A waiter

B journalist

C student

OD carpenter

### Answers

**Answer:**

A waiter

**Explanation:**

Specialization is the process of concentrating on and becoming an expert in a particular subject or skill. It can also be used to refer to the area on which someone becomes an expert. All the other options require years of gradual learning that builds up over the years for one to be considered an expert, asides for that of a "waiter"

Waiting does not require much training, and cannot be referred to as an area of specialization.

**Answer:**

student

**Explanation:**

it's the only one that is not an example of specialization.

6. How much less is the sun' tide-generating force less than the moon's and why is it less?

### Answers

**Answer: However, the sun is 390 times further from the Earth than is the moon. Thus, its tide-generating force is reduced by 3903, or about 59 million times less than the moon. Because of these conditions, the sun's tide-generating force is about half that of the moon (Thurman, H.V., 1994).**

**Explanation:**

a cyclist travels for 90 km. the trip lasts for 5 hours. what is the average speed of the cyclist?

### Answers

**Answer:**

The average speed of the cyclist is 18 [tex]\frac{km}{hour}[/tex]

**Explanation:**

Speed is a magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction. Because it considers direction, it is a vector quantity.

Then the average speed is the quotient of the space traveled by an object and the time it takes to cover the distance traveled:

[tex]speed=\frac{distance}{time}[/tex]

In this case:

distance: 90 kmtime: 5 hours

Replacing:

[tex]speed=\frac{90 km}{5 hours}[/tex]

Solving:

[tex]speed=18\frac{ km}{ hour}[/tex]

* The average speed of the cyclist is 18 *[tex]\frac{km}{hour}[/tex]

1. A runner has an initial speed of 2 [m/s] and slowly speeds up with a constant acceleration of

0.1 [m/s] over a distance of 100 meters. What is the runner's final velocity?

### Answers

Answer:

Final Velocity = 4.9 m/s

Explanation:

We are given;. Initial velocity; u = 2 m/s

Constant Acceleration; a = 0.1 m/s²

Distance; s = 100 m

To find the final velocity(v), we will use one of Newton's equations of motion;

v² = u² + 2as

Plugging in the relevant values to give;

v² = 2² + 2(0.1 × 100)

v² = 4 + 20

v² = 24

v = √24

v = 4.9 m/s

2. What is one way that science helps shape society?

### Answers

**Answer:**

**It gives us information that inform policy**.

**Explanation:**

science can form society by giving us information that tells policy.

It serves a **specific** **purpose** and also a range of purposes for the **financial** advantage of our **society**, including the generation of new knowledge, the improvement of **academic achievement**, and the enhancement of our quality of life. **Science** must address societal needs as well as **global** **challenges**.

What is science?

**Science** is the endeavor and application of **information** and understanding of the **natural **and **social **worlds through a systematic and evidence-based **methodology**.

Science provides solutions to everyday problems and aids in the **investigation** of the universe's great **mysteries**. Science, in other words, is one of the most important sources of **knowledge**.

**Psychology** is widely regarded as a **social** **science** and is listed on the National Science Foundation's list of **STEM** **disciplines**.

It serves a **specific** **purpose** as well as a variety of **financial** **benefits** to our society, such as the **generation** of new knowledge, the improvement of academic **achievement**, and the enhancement of our quality of **life**.

Science must address both **societal** needs and global **challenges**.

Thus, these are the ways that **science** helps a **society**.

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One cereal bar has a mass of 37 g. What is the mass of 6 cereal bars? Is that more than or less than 1 kg? Explain your answer.

### Answers

We have that the mass of 6 cereal bars is

6=222g

6 **cereal bars **less than 1 kg

From the question we are told that

One cereal bar has a **mass **of 37 g

6 **cereal **bars?

More than or less than 1 kg?

Generally

Since one bar=37g

Therefore

6=6*37

6=222g

Generally the equation for g to kg is **mathematically **given as

1000g=1kg

Therefore

6=222g

222g <1000

Hence

6 **cereal bars **less than 1 kg

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How much time did it take to travel 30 meter at 5 meter/second?

### Answers

**Answer:**

6 seconds

**Explanation: If you are traveling at 5 meters/ second then it will take you 6 seconds because 6 x 5 = 30. **

how fast do you go if you move 80 meters in 0.20 seconds?

### Answers

About 400.00 Meters per second.

(Think i may have gotten my decimal in the wrong place. If not then 4)

**Answer:**

14.40 km/h (kilometers per hour)

240.00 m/min (meters per minute)

Best answer: 4.00 m/s (meters per second)

**Explanation:**

Q 2 Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30°

as shown in Figure. Draw the reflected ray from the second mirror and find its angle of

reflection

30°

### Answers

a ray of light is incident towards a plane mirror at an angles of 30degrees with the mirror surface. what will be the angles of reflection is 60degree.

A train took 7 hours to complete its journey . For the first 3 hours it's average speed was 155km/h , for the remaining travel , the average speed was 186 km/h , what was the total distance ?

### Answers

**Answer:**

1395km

**Explanation:**

distance= **s****p****e****e****d****×****t****i****m****e**

First three hours.

*1**5**5**×**3**=** **4**6**5**k**m*

Remaining travel

*7**h**o**u**r**s**-**3**h**o**u**r**s**=** **5**h**o**u**r**s** **a**s** **t**h**e** **t**i**m**e** **f**o**r** **r**e**m**a**i**n**i**n**g** **t**r**a**v**e**l**.*

*5**×**1**8**6**=** **9**3**0**k**m*

Total distance = *4**6**5**k**m**+**9**3**0**km**=** **1**3**9**5**k**m*

An 8.38 gram sample of water lost 870 J of heat. What is the change in temperature

### Answers

**Answer:**

Find the mass of a sample of water if its temperature dropped 24.8 degrees Celsius when it lost 870 J of. heat. (specific heat of water is 4.18 J/g x degrees Celsius) 8.38 grams. How many degrees would the temperature of a 450 g piece of iron increase if 7600 J of.

**Explanation:**

A horse trots rightward 15m to eat a carrot then walks 20m to eat another. Then turns leftward to walk 4m the horse walks a total time of 74s what is the horses average velocity to reach the apple . What is the horses average speed to reach the Apple

### Answers

Answer:

A.) 0.42 m/s

B.) 0.53 m/s

Explanation:

Given that a horse trots rightward 15m to eat a carrot then walks 20m to eat another. Then turns leftward to walk 4m the horse walks a total time of 74s

A.) what is the horses average velocity to reach the apple?

The average velocity of the horse will be total displacement divided by total time.

To calculate total displacement, let the rightward be positive direction and leftward be negative direction.

Displacement = 15 + 20 - 4

Displacement = 31 m

Average velocity = displacement/time

Substitute all the parameters into the formula

Average velocity = 31 / 74

Average velocity = 0.4189 m/s

Therefore, the average velocity for the horse to reach the apple is 0.42 m/s approximately

B.) What is the horses average speed to reach the Apple

Average speed will be total distance covered divided by total time

Total distance = 15 + 20 + 4

Total distance = 39

Average speed = distance/time

Substitute all the parameters into the formula

Average speed = 39/74

Average speed = 0.527 m/s

Therefore, the average speed for the horse to reach the Apple is 0.53 m/s

What is the phase change called, when a GAS turns in to a SOLID

### Answers

**Answer:Deposition **

**Explanation:Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. ... The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.**

Deposition - gas to solid

Branch of physics which deals with properties of light

### Answers

Answer:

Branch of physics which deals with properties of light is called Optics

Explanation:

When a book is dropped from the table, it falls towards the Earth. But when it is placed on the table, it does not fall towards the Earth while the gravity is still acting. Give reason.

### Answers

Answer:

The table that the book is on is also exerting the same amount of force on the book upwards, which is why it doesn’t fall down.

A shopper walks Eastward 3.2 meters and then westward 7.2 meters what is the distance and magnitude and direction ?

### Answers

**Explanation:**

Given that,

A shopper walks Eastward 3.2 meters and then westward 7.2 meters.

Let East is positive direction and west is negative direction.

Initially, he walks +3.2 m and finally, he walks (-7.2 m)

**Distance = 3.2 m + 7.2 m = 10.4 m**

Displacement = final position - initial position

= -7.2-3.2

=-10.4 m

**The negative sign shows west direction. It means that direction of shopper is due west. **

Which of the following is a vector?

7 meters

0.007 cm

7x 106m

7 miles Northwest

### Answers

The **vector **from the following **options **needs to be **identified**.

The **last **option **7 miles Northwest** is a **vector.**

Vectors

A **vector **is a geometric **object **that has both **magnitude **and **direction**.

For example: Velocity, force, displacement etc.

A **scalar **is a **geometric **object that has only **magnitude**.

For example: Speed, distance etc.

The first **three **options 7 meters, 0.007 cm and [tex]7\times 10^6\ \text{m}[/tex] are all distances, with no **direction **mentioned. So, they are **scalar **quantities.

The **last option** is 7 miles northwest has **distance **as well as **direction **so it is a **vector **quantity.

Learn more about **vectors**:

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If the ratio of numbers of turns in secondary to primary coil is 1:4. calculate teh secondary voltage where primary voltage is 220v

### Answers

**Answer:**

Ns/Np=1/4

Vs=?

Vp=220V

Ns/Np=Vs/Vp

Vs=Ns/NpxVp=1/4x220=55V

**Explanation:**

Find the acceleration of an object that has a mass of 6 kg, if it is acted upon by a net force of 42 N.

### Answers

**Answer:**

7 m/s²

**Explanation:**

The formula for force is:

[tex]f= m*a[/tex]

We want to find acceleration, so we must rearrange the formula for [tex]a[/tex]. Divide both sides of the equation by [tex]m[/tex]

[tex]\frac{f}{m}=\frac{m*a}{m}[/tex]

[tex]\frac{f}{m}=a[/tex]

Acceleration can be found by dividing the force by the mass.

The force is 42 newtons and the mass is 6 kilograms. A newton is equal to 1 kg * m/s², therefore the force is 42 kg* m/s².

[tex]f= 42 kg*m/s^2\\m=6 kg[/tex]

Substitute the values into the formula.

[tex]a=\frac{f}{m}[/tex]

[tex]a=\frac{42 kg*m/s^2}{6kg}[/tex]

Divide. When we divide, the kg in the numerator and denominator will cancel each other out.

[tex]a=\frac{42}{6}m/s^2[/tex]

[tex]a= 7 m/s^2[/tex]

The acceleration of the object is **7 meters per square seconds. **

MA and VR have no units. Why?

### Answers

**Answer:**

There is no unit for MA and VR since the unit for both input and output forces cancels out.

Which two forces are always equal and opposite for an object on a surface?

### Answers

**Answer:**

Suppose any object with mass in our planet.

The object will be affected by the gravitational force, that pulls the object down. Now, a table in your dining room is also affected by this force, but the table is in a surface (the ground) and it does not move.

We know that if an object does not move, then the net force acting on it is equal to zero, this means that there is a force equal and opposite ot the gravitational force.

This force is the normal force, that the ground applies on the table. This force comes as a "response" to the table pushing the ground (By 3rd Newton's law).

So two forces that are always equal and opposite are the forces caused by this law.

A baseball travels 200 metes in 6 seconds, what is the baseball’s velocity?

### Answers

**Answer:**

**33.33 m/sec**

**Explanation:**

A baseball travels 200 metes in 6 seconds,

what is the baseball’s velocity?

use the formula: velocity = distance over time

where (d) distance = 200 m

and (t) time = 6 sec.

plugin values into the formula:

v = d / t

= 200 m / 6 sec

= 33.33 m/sec.

**therefore, the baseball's velocity is 33.33 m/sec**

according to the theory proposed by harry hess what causes continents to move

### Answers

**Answer:**

the answer is C

**Explanation:**

the seafloor is spreading

**Answer:**

Seafloor Spreading is the** CORRECT **answer

**Explanation:**

i took the test

what is imago?plzz can anyone tell me

### Answers

**Answer:**

Hope the above pic might help you :)

A plane mirror is mounted on the back of a truck which is traveling 20m/s. how fast does the image of a man standing in the road behind the truck seem to be moving away from him

### Answers

**Answer:**

It moves at 40 m/s.

If the man is 10 meters from the truck then his image appears to be

20 meters away. So in a given unit of the time the image will appear to

move twice as far as the truck moves from the man.

Where’s is the name carbon dioxide from?

### Answers

**Answer:**

Carbon dioxide therefore comes first of all from the combustion of fossil fuels such as coal, oil or even natural gas. It is also generated by the respiration of all living organisms as well as by the fermentation of sugars in beer and winemaking.

**Explanation:**

**Answer:**

A Scottish chemist named Joseph Black was the first person to identify carbon dioxide in 1750.

**Explanation:**