Physics High School

A boy throws a ball vertically up. It returns to the
ground after 5 seconds. Find
(a) the maximum height reached by the ball.
(b) the velocity with which the ball is thrown up.

Answers

Answer 1

Answer:

31.25 m

25m/sec

Explanation:

Given :-

Time = 5sec

V = 0 (in going up)

U = 0 (in comming down)

Find :-

H and U by which it is thrown up

Since the total time is 5 sec ,therefore half time will be taken to go up and another half will be taken to go down .

We know that ,

V = U + gt

0 = U - 10*2.5

U = 25 m/sec

Also,

V² = U² +2gs

0 = 625 - 20s

s = 625/20 = 31.25 m

Related Questions

state Newton's law of gravitation.​

Answers

Explanation:

Newton’s law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

Hope this helps!

Please find attached photograph for your answer

How many neutrons are in the nucleus of an atom with an atomic mass of 80 A.M.U. and an atomic number of 35?

Answers

Answer:

45

Explanation:

The mass number is 80

Proton number is 35

A-P=n

80-35=45

In its elemental state, carbon is available as:
a
Coal
b Graphite
C Diamond
All of the above

Answers

I believe the answer is coal

Answer: D all of the above

Explanation: Coal, Graphite, Diamond are all allotropes of Carbon. Hope this helps :)

What kinds of food can’t your body break down

Answers

Answer:

fiber

Explanation:

do you know any good books about physics and math?​

Answers

What Is Mathematics? Is a book about math


A book about physics /A Brief History of Time

Which statement explains why 49 is a perfect square?

Answers

It’s the product of 7 x 7. The square root of 49 is 7

Answer:

It’s the product of 7 x 7. The square root of 49 is 7

Explanation:

It’s the product of 7 x 7. The square root of 49 is 7

Why do you fall forward when you stub your toe on a chair? Explain in terms.

Answers

Answer & Explanation:

This can be explained with Newton's first law, Inertia - if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.  

When you walk, your entire body is in a forwarding motion. If your toe hits an object (in this case, a chair), only this unfortunate toe will stop while the rest of your body continues its forwarding motion, resulting in you falling forward.

Energy that comes from the heat inside the Earth is called ________ energy.

Answers

Answer:

Geothermal Energy.

Explanation:

Geothermal !! Hopes this help you!!

EASY BRAINLIEST!!URGENT PLEASE HELP.


-if you answer correctly ill give you brainliest which will give you 27pts-

Answers

B is ur answer dudeeee

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Answers

I've attached a picture of the 3 electromagnets options below the main electromagnet.

Answer:

The third electromagnet is correct.

Explanation:

From the attached image, in the electromagnet above the 3, we can see that the positive terminal comes before the negative terminal at the bottom left.

Now, when it is reversed, they will both move to the bottom right but their position will change with the negative coming before the positive.

Also, the electric current arrow inside the circle points in the north west direction but when it is reversed, it will point in the north east direction.

Also, the winded coil over the pole remains the same.

Thus, the only option that fulfills this reversed positions is the 3rd electromagnet

Answer:

Explanation:

Its B and C, I got a 5/5 on my test with these answers.

an airplane has a maximum velocity of 160km/h in still air. calculate its maximum velocity when it travels in air with a crosswind of 30km/h

Answers

Answer:

Velocity can be directly added or subtracted.

For example, if a boat has a velocity V in still water.

And now you put the boat in a river with a current that has a velocity V'

The total velocity of the boat in that river is just the addition of these two velocities.

Velocity in the river  = V + V'

Where the only tricky part is that the velocity is a vector, so you need to take in account the directions of each vector.

In this case, we have a plane with a maximum velocity of 160km, let's assume a direction for this velocity, let's say that is in the positive x-direction.

Then we can write the velocity in the vector form:

velocity  = (vel in x-axis, vel in y-axis)

The velocity of the plane can be written as:

v = (160km/h, 0)

Now we add a crosswind of 30km/h

crosswind means that it is perpendicular, then it acts on the y-axis.

Then the total velocity of the plane will be:

velocity = (160km/h, 0) + (0, 30km/h)

velocity = (160km/h, 30km/h)

Now you can compute the total velocity of the airplane as the module of that vector.

Remember that for a vector (x, y) the module is:

mod = √(x^2 + y^2)

Then the module of the velocity is:

v = √( (160km/h)^2 + (30km/h)^2) = 162.8 km/h

I'm giving 40 points for this

Answers

Answer:

1 is true  4 is false 5 is c i think 6 is a 7 is c 3 is a 2 is c 8 is c 9 is true 10 is c

Explanation:

Which is a property of every
mixture?

Answers

One substance can be separated from another through physical means is a property of every mixture.

The smallest molecules are made up of -
a. 1 atom
b. 2 atoms
c. 3 atoms
The largest molecules are made up of -
a. billions
b. millions
c. hundreds
d. thousands
- of atoms.​

Answers

For the first question the correct answer is B. 2 atoms
Second question the answer is A. Billions

3 Which organisms survive well on volcanic islands?
1. bacteria
2. birds
3. plants
4. large animals

Answers

plants

i hope its right and have a nice day

Answer:

number 1

Explanation:

Can someone pls answer

Answers

Answer:

im still in elementry so you got to do it yo self

Explanation:

so me confused

Solutes dissolve quicker in _________ water.


warm

cold

cool

Answers

Answer is : warm , explanation :
Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.

What is the gravitational field value (g) on planet Saturn with a mass of 5.69 X 1026
and an average radius of 6.03 X 107 m?

Answers

It’ll jus add up 2 a weird numeral number

What do bats, dolphin, and whale use to determine their location?
A-Location
B-Frequency
C-Echolocation
D-Amplitude
Please Help ​

Answers

C. Echolocation

Echolocating animals emit calls out to the environment and listen to the echoes of those calls that return from various objects near them. They use these echoes to locate and identify the objects.

If 2 people are on a bed and they are the same weight, and 1 of them gets off and the bed breaks who is responsible? Is it the person still on the bed or the person who got off?

Answers

Answer:

I would say the one who got up bc if he or she wouldn't have gotten up the bed wouldn't have broke

A common way to measure the distance to lightning is to start counting, one count per second, as soon as you see the flash. Stop counting when you hear the thunder and divide by five to get the distance in miles. Use this information to estimate the speed of sound in m/s. Show your work below. This will require some conversions.

Answers

Answer:

d = 1.07 mile

Explanation:

The rationale for this method is that the speed of light is much greater than the speed of sound, the definition of speed in uniform motion is  

v = d / t  

d = v t  

the speed of sound is worth  

v = 343 m / s  

Therefore, the speed of sound must be multiplied by time to do this, all the units must be in the same system, as the distance in miles is requested  

v = 343 m/s (1mile/1609 m) (3600s/1 h) = 343 (2.24) = 767.4 mile/h  

v = 343 m / s (1 mile / 1609 m) = 0.213, mile/ s  

If the measured time is t = 5s we multiply it by the speed  

we substitute  

d = 0.213 5

d = 1.07 mile

If you want to calculate the speed, this method in general is not widely used, since you must know the distance where the lightning occurred, which is relatively complicated.

True or False: Opaque materials allow no visible light through them.

PLEASE ANSWER QUICKLY.

Answers

Answer:

This is true.

true because opaque materials are not able to be seen through;not transparent

A boy of mass 50 kg runs with a force of 100 N, his acceleration would be?

Answers

Answer:

2

Explanation:

100/50=2

Which person below is likely to have better health?
A. Jenna, who is optimistic about life
B. Albert, who thinks that events in his life are not in his control
C. Peter, who is depressed
D. Claire, who blames everyone else for her circumstances
SUBMIT

Answers

A. Jenna because an optimistic person always has a healthier look in life!

Jenna, who is optimistic about life, is likely to have better health. Hence, option (A) is correct.

What is mental health?

Mental health affects cognition, perception, and behavior and includes emotional, psychological, and social well-being. It also affects how someone responds to stress, interacts with others, and makes decisions.

Subjective well-being, perceived self-efficacy, autonomy, competence, generational reliance, and self-actualization of one's intellectual and emotional potential are only a few examples of what is considered to be mental health.

The ability to enjoy life and strike a balance between daily activities and endeavors to develop psychological resilience may be considered a sign of mental health from the viewpoints of positive psychology or holistic approaches.

Learn more about mental health here:

https://brainly.com/question/18216607

#SPJ2

The only players permitted to wear mitts over gloves are _________.
1 the pitcher and first base player
2 the catcher and outfielder
3 the catcher and first base player
4 the catcher and pitcher

Answers

Answer:

the catcher and outfielder

Explanation:

Answer: The catcher and the player at first base are the only players permitted to wear mitts rather than gloves. So, the answer would be 3.

Explanation: I had this on a quiz and got it right.

Hope this helps!

Name the type of component that has a greater resistance as the current through it increases​

Answers

Answer:

filament bulb, filament lamp

Explanation:

More length of a wire is a component that has a greater resistance as the current through it increases​.

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions present in the wire as they pass through. The moving electrons can collide with the ions present in the metal.

This makes more difficult for the current to flow and causes resistance in the wire so we can conclude that more length of a wire is a component that has greater resistance as more current passes through it.

Learn more: https://brainly.com/question/22706894

You have a 40-Hz sound wave and a 5,000-Hz sound wave. Both are traveling

through steel. Which sound wave will travel faster?

The waves will travel at the same speed as one another.

The 40-Hz wave will travel the fastest.

The 5,000-Hz wave will travel the fastest.

The louder of the two sound waves with travel the fastest.

Answers

Answer:

5,000-Hz

Explanation:

A force of 355 N is applied to an object that accelerates at a rate of 7.8 m/sec2 . What is the mass of the object ?

Answers

Answer:

A force of 355 N is applied to an object that accelerates at a rate of 7.8 m/sec2 . What is the mass of the object ?

Explanation:

What makes water a natural resource?

A.
It is a natural material that can be easily replaced.

B.
It is a material found in nature that people can use.

C.
It is a material that people can easily make and use.

D.
It is a energy source that cannot be replaced.

Answers

Answer:

I belive is the answer is B. It is a material found in nature that people can use. Because water is technically a natural resource.

Both the terms immigration ("moving into a population") and emigration ("moving out of a population") come from the Latin word migrare ("to move"). What do you think the prefixes im- and e- mean?

Answers

Answer:

im means into

e means out of

Explanation:

Using the definitions of immigration and emigration as points of reference, the following explanation applies.

Both terms are derived from migration which means moving from one place to another.

By further explanation:

The "im" in the definition of immigration means "into" while the "e" in the definition of emigration means "out of"

Other Questions
For this exercise, you will complete the TicTacToe Board that we started in the 2D Arrays Lesson.We will add a couple of methods to the TicTacToe class.To track whose turn it is, we will use a counter turn. This is already declared as a private instance variable.Create a getTurn method that returns the value of turn.Other methods to implement:printBoard()- This method should print the TicTacToe array onto the console. The board should include numbers that can help the user figure out which row and which column they are viewing at any given time. Sample output for this would be: 0 1 20 - - - 1 - - - 2 - - - pickLocation(int row, int col)- This method returns a boolean value that determines if the spot a user picks to put their piece is valid. A valid space is one where the row and column are within the size of the board, and there are no X or O values currently present.takeTurn(int row, int col)- This method adds an X or O to the array at position row,col depending on whose turn it is. If its an even turn, X should be added to the array, if its odd, O should be added. It also adds one to the value of turn.checkWin()- This method returns a boolean that determines if a user has won the game. This method uses three methods to make that check:checkCol- This checks if a player has three X or O values in a single column, and returns true if thats the case.checkRow - This checks if a player has three X or O values in a single row.checkDiag - This checks if a player has three X or O values diagonally.checkWin() only returns true if one of these three checks is true.public class TicTacToeTester{ public static void main(String[] args) { //This is to help you test your methods. Feel free to add code at the end to check //to see if your checkWin method works! TicTacToe game = new TicTacToe(); System.out.println("Initial Game Board:"); game.printBoard(); //Prints the first row of turns taken for(int row = 0; row < 3; row++) { if(game.pickLocation(0, row)) { game.takeTurn(0, row); } } System.out.println("\nAfter three turns:"); game.printBoard(); }}public class TicTacToe{ private int turn; private String[][] board = new String[3][3]; public TicTacToe() { for(int i = 0; i < 3; i++) { for(int j = 0; j < 3; j++) { board[i][j] = "-"; } } } //this method returns the current turn public int getTurn() { return turn; } /*This method prints out the board array on to the console */ public void printBoard() { } //This method returns true if space row, col is a valid space public boolean pickLocation(int row, int col) { return true; } //This method places an X or O at location row,col based on the int turn public void takeTurn(int row, int col) { } //This method returns a boolean that returns true if a row has three X or O's in a row public boolean checkRow() { return true; } //This method returns a boolean that returns true if a col has three X or O's public boolean checkCol() { return true; } //This method returns a boolean that returns true if either diagonal has three X or O's public boolean checkDiag() { return true; } //This method returns a boolean that checks if someone has won the game public boolean checkWin() { return true; }} Read the section "No More Human Error."Which sentence from the section shows why robot referees are better than human referees?ASimilar systems could handle calls in many different sports.BIt shouldn't have any favoritism toward certain teams or players.CFor example, they can manage a player who's upset or angry.DTennis matches usually have up to nine umpires. 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