# Posts by DJ

Total # Posts: 289

**Physics - HELP please**

A 24.0 kg box (m1) rests on a table.(b) A 13.0 kg box (m2) is placed on top of the 24.0 kg box, as shown in Fig. 4-35. Determine the normal force that the table exerts on the 24.0 kg box. Determine the normal force that the 24.0 kg box exerts on the 13.0 kg box.

**Physics - HELP please**

A 24.0 kg box (m1) rests on a table.(b) A 13.0 kg box (m2) is placed on top of the 24.0 kg box, as shown in Fig. 4-35. Determine the normal force that the table exerts on the 24.0 kg box. Determine the normal force that the 24.0 kg box exerts on the 13.0 kg box.

**physics**

what if there are no passengers? for max force i got 330 and for the min force i got 165

**physics**

An elevator (mass 4125 kg) is to be designed so that the maximum acceleration is 0.0400g. What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?

**physics - forces**

A person pushes a 16.0 kg lawn mower at constant speed with a force of 70.0 N directed along the handle, which is at an angle of è = 45.0° to the horizontal. Calculate the force the person must exert on the lawn mower to accelerate it from rest to 1.2 m/s in 2.0 ...

**physics**

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. The plane is traveling horizontally with a speed of 280 km/h (77.8 m/s). (b) Suppose, instead, that the plane releases the supplies a horizontal distance of 425 m in advance of ...

**physics**

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. The plane is traveling horizontally with a speed of 280 km/h (77.8 m/s). (b) Suppose, instead, that the plane releases the supplies a horizontal distance of 425 m in advance of ...

**physics**

An airplane is heading due south at a speed of 515 km/h. A wind begins blowing from the southwest at a speed of 100 km/h (average). (Hint: First draw a diagram.) (a) What is the velocity (magnitude and direction) of the plane relative to the ground? magnitude/direction (east ...

**physics**

A hunter aims directly at a target (on the same level) 120 m away. (a) If the bullet leaves the gun at a speed of 290 m/s, by how much will it miss the target? (b) At what angle should the gun be aimed so the target will be hit?

**physics**

A car is driven 105 km west and then 30 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?

**chemistry**

what is the molarity of the solution which contains 5.0g of NaOH(formar weight=40g/mole)dissolved in water to make 200 ml of soluitons?

**physics**

positive

**social studies 7th grade**

what was the name of the school

**social studies 7th grade**

School from old times that would hit kids stick if they talked back or out of turn if they had messy work they would hit them

**math?**

thats why the answer not 3^2^280 I am not understanding the answer you don't multiply 3*2=6^80

**math?**

In the second problem why do I put a 1 before 2^80?

**math?**

Simplify each of the following, if possible. Write your answers in exponential form, a^b 3^4*3^7*3^6 2^80+3*2^80

**people**

Many years ago, a cruise liner sank in the middle of the Pacific Ocean. The survivors luckily landed on a remote desert island. There was enough food for the 220 people to last three weeks. Six days later a rescue ship appeared, unluckily this ship also sank, leaving an ...

**english**

Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our ...

**4th grade**

write the missing improper fraction in each box

**statistics**

The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10. a. Compute the mean for this sample. Show your work!! b. Compute the range for this sample. Show your work!! c. Compute the variance for this sample. Show your work!! d. Compute the ...

**science**

measurement of an average classroom door is closest to 1 meter

**science**

measurement of an average classroom door is closest to 1 meter

**math**

What is the difference between a expression and a equation?

**math**

Find the vertex of y = −3(x + 1)2 + 5 Find the vertex of y = −2t2 + 12t − 23

**math**

never mind

**math**

Use the rule of Logarithm, then solve for x Log 2x+1 - log (x+5)=0 x=4 *I know x equals for can you explain how?

**Criminal Justice 200**

How would one define crime and how would on say if it is consenus or conflict?

**Criminal Justice 200**

How would you define crime control and due process model. And which one would you consider effective?

**college**

I am stuck with this question. Which system would one believe in and more effective control model or due process model.

**algebra**

5x=7+4y 20x-16y=28 how many solutions are there for the system of equations? Infinitely many solutions No solution. two solutions or three solutions?

**Math**

Write 1024 as a power of 4.

**Computer**

i need a image of a diskette with this sizes: size 8 size 5 1/4 size 3 1/2 (maybe they are size inches) i search and search and search but i cant find them please i will pass this on monday thx! Jiskha rock!

**math**

1/4x-1/6y=-2 -1/6x+1/5y=4 solve for x and y its suppose to be x equals 12 and y equals 30 need steps thanks

**math**

Thank you Reiny you really help me.

**math**

please can someone help me with this problem. I am doing substitution. 3x + 4y = 0 y = x you have to substituted the y for x Then the same other problem with different number. y = x -6x + 8y = -2

**math**

A grocery store has a gallon of milk for $2.30. They also have a 4 litter container of milk for $2.30. Which is the better buy and why? Please somebody help me with this question? So far I did Gallon 1 = x liter 3.79 4 4 = 3.79x cross out divide 3.79 3.79 x=1.055 gallon

**science**

Austin took a shower from 7:56 to 8:08 and used sixty gallons of water. Assuming the same rate of water usage, how much water would Austin have saved if he had taken a quick six-minute shower? help

**science**

why do we celebrate earth day? is it important to celebrate earth day?

**social study**

what were two purposes of the mounds built by the mound builders? please help me with this question

**science**

In an ecosystem, some species become so adapted to each other that neither could survive without the other. Name one species and describe how it has become so adapted to organisms of another species that it could not survive without them. someone please help me with this ...

**science**

can someone please help me with this question. Give me an example of a jellyfish and a eagle body plan or internal structures. Then explain what is a body plans and internal structures for animal.

**science**

Thank you for your help?

**science**

Can someone help me with this question please? explain how earth naturally recycles carbon dioxide.

**science**

Identify two effects of tectonic plate movement. then explain how tectonic plate movement cause each of the effects you identified. Please someone help me with this question . The one effect I can think of is they form mountains and volcano but i don't know if it right or ...

**Prealgebra**

x+y=9 2x=4 because 2x2=4 y=2x x+2x=9 x+4=9 -4 -4 x=5 x+y=9 chick answer by 5+4=9

**Calculus**

13242

**science**

A university student wants to perform an experiment using mice as test subjects. The procedure would require the mice to be injected with a specific bacterial infection and then treated with an antibiotic. Their response to the treatment would be observed and recorded. Provide...

**science**

thank you for your help

**science**

If Earth is 149.6 million Kilometers from the sun, or 93 million miles away. suppose there was an imaginary road from earth to the sun. If you were in a car traveling 100 km an hour, it would take you 1,490,000 hours or just 170 years to reach the sun. If it took 170 years to ...

**science**

Ms. Sue is driving a car every day to work one of the scientific thinking of characteristic in daily life.

**science**

Scientist keep accurate records when they are conducting an investigation. Describe two reasons why it is important that scientists keep clear, thorough, accurate records. Please help me? thank you

**science**

please can someone help me with this question. Describe two characteristics of scientific thinking that are helpful to people in daily life.

**pre-algebra**

The reason why I call the big square x^2, the rectangle x and the smaller square by just constant is because when you are using polynomial tiles the big square stands for x^2 of -X^2 while the rectangle stand for just x or -x and the small square stand for numbers.

**pre-algebra**

You are working on a polynomials problem with algebra tiles. You have five big squares, seven rectangles, and eight small squares on your desk. your classmate leans over and borrows three big squares, one rectangle, and five small squares. Write an algebraic equation that ...

**letter**

Dear Mr. Donahue, How are you? My name is Nana Turay and I am an 8th grade student. I am writing you this latter because I was wondering if we could have a school dance by the end of the school year. I know we good student are making life tough for you never less we still love...

**pre-algebra**

thank you for your help

**pre-algebra**

Shannon put $ 7,000 in a 5 year CD that paid 8% interest per year. Malcolm put $6,000 in a 5 year CD that paid 10% interest. What was the balance of each person's account at the end of the 5 years? Who made more money and how much more did they make? (Use I= PRT Where I= ...

**pre-algebra**

can someone check if this inequality is solve right 5x + 3 >= 28 -3 -3 5x >= 25 5 5 x <= 5

**pre-algebra**

Mrs. Boyd went shopping at city center Mall. she parked her car in the parking garage. The cost for parking was $1.00 for the first hour and $0.75 for each additional 1/2 hour. Mrs. Boyd paid $4.75 for parking. Write an equation to find how long Mrs. Boyd was shopping. How ...

**science**

How does knowing the age of a lunar rock help astronomers estimate the age of the surface of a planet with no atmosphere?

**science**

Describe one reason asteroids may become a natural resource in the future.

**science**

If nuclear fusion in the sun's core suddenly stopped today, would the sky be dark in the daytime tomorrow? why

**science**

What two properties of Neptune's moon triton make it unusual?

**science**

what three characteristics do the inner planets have in common?

**science**

What conclusion can you draw about a planet;s properties just by knowing how far it is from the sun.

**science**

How does knowing the age of a lunar rock help estimate the age of the surface of a planet with no atmosphere?

**science**

How does gravity keep a planet moving in an orbit around the sun?

**science**

Explain why there is only one planet in each orbit around the sun?

**math**

Double check please Write each of the following as a common fraction or mixed number. Write your answer in lowest term 28. 15.35 Answer: 1535 / 100 = 307/20 = 15 35/100 is 15 7/20 Complete each of the following statement, using the symbol < or > 5/16 _0.313 Answer >

**science**

explain how sound is transmitted through a medium?

**science**

Give example of constructive and destructive interference sound waves?

**science**

Explain how amplitude and loudness are related?

**science**

Explain how amplitude and frequency are related to the energy of wave?

**science**

Describe how sound is caused by vibration?

**science**

Explain how sound is transmitted through a medium?

**Science**

what helps some single-celled organisms move or feed themselves? It has to be a five letter word ending in a. I've looked all through my text book and can't find it!! Thanks!

**American Literature**

synopsis"prayer of the First Dancers"

**science**

What are its components of water quality ?

**Science**

What are its components of water quality?

**Science**

what is the water quality overall (USA)?

**science**

What is the quality overall locally(USA)?

**SCIENCE**

colines

**french question**

how does one say "the test will be difficult?"

**English/Reading**

THANK YOU!!!

**English/Reading**

Hidden meaning? PPPP --------- earth Thanks!

**check my answer? :)**

ok, the question was "is the following ratios equivalent?" the ratios are 3:5 and 5:7. my answer is "no". is that right? you are correct. The way to know is divide the 3 by 5 and the 5 by 7 If the numbers are different, the ratios are not equal. Get it?

**algebra 1**

what if i was solving for h? what would i do?

**Ethics**

Same question..... need some help!! OH AND GO AXIA!