# Donald

Newest questions and responses by Donald-
## physics

A bullet of mass 0.045kg is fired from a gun of mass 9kg, the bullet moving with an initial velocity of 200m/s. Find the initial backward velocity of the gun.

*asked on January 5, 2018* -
## physics

estimate number of impacts number of imapcts air molecule make with palm of your hand assuming all air is nitrogen molar mass =.0028

*asked on December 16, 2017* -
## Math

Write the ratio as a fraction in lowest terms. 1 1/7 to 3 1/4

*asked on September 17, 2017* -
## Math calculus

(2) (-1) (3)+(4)

*asked on June 2, 2017* -
## Math A Calculus

For a =( 2 ÷3)and b=(-1÷4)..Find a).. a+b b).. | a+b | c).. Find the length of the vector i + 2j-- 2k

*asked on June 2, 2017* -
## Math

An aircraft has airspeed of 300km/h and it's course is 020°. The speed of the wind is 80km/h blowing from 320°..sketch the diagram to represent this information (ie: the triangle of velocities).

*asked on June 2, 2017* -
## Math

A man walk 9km in the direction 246 degrees and then for 6km in the direction 096 degrees...... What is the displacement from the starting point?..... Formula and answer please?

*asked on June 2, 2017* -
## Math

A man walk 9km in the direction 246 degrees and then for 6km in the direction 096 degrees.... What is the answer in diagram Form?

*asked on June 2, 2017* -
## Math

Good evening. I posted a math question earlier that I never received any help on because someone posted something inappropriate. My new math problem is as follows: The area of a rectangular piece of a land is 3/16 square miles. If the width of the piece of

*asked on February 21, 2017* -
## Math

Ricardo has a $50.00 gift card for an electronics Store. He also has a coupon good for $10 off his Purchase. Let a represent the amount of merchandise Ricardo can buy from the store using his gift card and coupon. Graph the solution set for a on the number

*asked on February 21, 2017* -
## Science

In what levels are producers and tertiary consumers, respectively found in an energy pyramid? I am kind of lost on how I am supposed to determine what level a producer is at on a pyramid? Can you please help me with this.

*asked on February 1, 2017* -
## Science

Which level of consumer is an owl in the following chain: grass, cricket, mouse, and owl? I do not know understand this at all can you please explain this so I can get a better understanding of this?

*asked on February 1, 2017* -
## Science

What factor is described when low water levels are causing animals to die from dehydration? I am confused on this. Please help. I don't even know where to begin looking

*asked on February 1, 2017* -
## Math

Mrs. Sue, I have a math question if you can please help me on this. I am confused. I am doing coordinates. If I have a theater at 5 and a Restaurant at -4 (5,-4) how do I find out the halfway point in between?

*asked on February 1, 2017* -
## chemistry

Explain the first ionization energy of lithium is greater than that of sodium

*asked on January 30, 2017* -
## chemistry

How many unpaired electrons for cr3+

*asked on January 30, 2017* -
## Math

Good evening everyone. I am very confused on how to work on the below problem. Ingrid walked her dog and washed her car. The time she spent walking her dog was 1/4 the time it took to wash her car. It took Ingrid 14 minutes to walk the dog. How long did it

*asked on January 23, 2017* -
## math

write equation of hyperbola with cebter c(4,2) vertex (4,5) equation of one asymptote 4y-3x=-4

*asked on January 21, 2017* -
## chemistry

Calculate the energies of the states of hydrogen atom with n=2 and n=3

*asked on January 13, 2017* -
## chemistry

Calculate the energy required for ionization of electron from the ground state of hydrogen atom

*asked on January 11, 2017* -
## chemistry

Calculate the energy required for ionization of electron from the ground state of hydrogen atom

*asked on January 9, 2017* -
## chemistry

Calculate the maximum number of unpaired electrons that can be placed in a 6d subshell

*asked on January 7, 2017* -
## science

Explain the purpose of a control in a scientific experiment

*asked on January 1, 2017* -
## science

If a scientist wished to to determine the effect of a certain herbicide on wee growth he would include a control in the investigation. Suggest a suitable control in this case.

*asked on January 1, 2017* -
## science

Describe how you would investigate effect of ph on enzymes rate. Draw a labelled diagram to show how you carried out the experiment

*asked on January 1, 2017* -
## science

Explain how end product inhibition can control enzyme activity in living cells

*asked on December 31, 2016* -
## science

What is the unit for measuring enzyme activity? What is turnover number

*asked on December 31, 2016* -
## math

A circle has centre(5,12) and its tangent to the line with equation 2x-y+3=0. Wtite equation of the cirle

*asked on December 30, 2016* -
## math

A circle has centre(5,12) and its tangent to the line with equation 2x-y+3=0. Wtite equation of the cirle

*asked on December 28, 2016* -
## math

The locus of point whose distance from the point (0,5) is always 3/4 of its distance from line y=8 is an ellipse. Find major and minor axis

*asked on December 22, 2016* -
## Math

Hello I need to ask a question. This is all new to me as we are just learning this in school. How would I write an inequality with -197 and -110? I have never done this before. Can you please help me?

*asked on December 6, 2016* -
## Language Arts

Good evening. I have a problem in English Language Arts. I have to write a poem. The instructions are as follows: Write a short poem that reflects the mood you interpret of a season (Spring, Summer, Fall or Winter). Follow the requirements listed below: 1.

*asked on December 2, 2016* -
## Math

Combine like terms. 7a square root 2 - a square root 2 + 16= My answer would be as follows: 7a square root 2 + 16 Can you please check to see if I got this correct

*asked on November 27, 2016* -
## Math

Combine like terms. 6b plus 7b-10= Would I add 6b + 7b=13b-10 13b-10=3b? Would this be correct? Please advise.

*asked on November 27, 2016* -
## Math

Combine like terms. 32y plus 5y= I don't know what to do. I don't understand this. Please help.

*asked on November 27, 2016* -
## Math

Question. I have some math problems that I really need help with and this is all new to me. The direction are as follows: Combine like terms 7x4 -5x4 the number four is square root. I don't understand at all what to do. Please help.

*asked on November 27, 2016* -
## Math

Evaluate the following expression: (2 x 3)>2 - 5>2 The answer I got was 11...How I got this answer was 6 x 6 = 36 and 5 x 5 = 25 then I subtracted 36-25=11`

*asked on November 25, 2016* -
## math

Use the distributive property to write an expression that is equivalent to the example below: 5(2x + 7) I think my answer is... 45.....How I got this answer was 5 x 2 + 5 x 7=45 10 + 35 = 45 Can you please double check my work?

*asked on November 25, 2016* -
## Math

Which of the following is equivalent to the expression 6m + 3? A)2(3m + 3) B)3(2m + 1) C)3(2m + 3) D)6(m + 3) The answer I got was B) 3(2m + 1). How I got this answer was 3 x 2 + 3 x 1 = 6m + 3.

*asked on November 25, 2016* -
## Math

How do you write at least 6 fractions from the below ingredients list that serves 4 people. 1 cup all-purpose flour 2 eggs 1/2 cup milk 1/2 cup water 1/4 teaspoon salt 2 tablespoons butter , melted How do I make these fractions? PLEASE PLEASE PLEASE PLEASE

*asked on November 25, 2016* -
## Math

I really need help with this please help me. 360 kilometers is 24% of ______kilometers

*asked on October 25, 2016* -
## Math

Write each percent as a fraction and as a decimal. 7. 72% full 72/100 or .72 9. 500% increase Would it be 500/100 or 500/1000? .500 11. 37% profit 37/100 and .37 Please be so kind as to double check my answers and explain to me if I got anything wrong so I

*asked on October 24, 2016* -
## Science

The above is an article which I had to read for homework and one of the questions that I have to answer is as follows: Which bucket(s) could be supported with evidence from this Document? I do not understand this at all. Please help me.

*asked on October 20, 2016* -
## Science

For many years it was believed by geologists that the location of the continents was fixed.These scientists believed that the locations of the continents was determined many billions of years ago,as the young Earth cooled down from its original state as a

*asked on October 20, 2016* -
## algebra

5digit palidrone 6 - - 5 multiple of 9

*asked on September 11, 2016* -
## life orantation

Make six suggestions on how to combat the violations of human rights identified by you in the previous questions and indicate any organisations you have come about in your research and indicate how they combat the discriminations.

*asked on May 13, 2016* -
## Math

When looking at the problem given in the Video Example 84 –Factoring Out the Opposite of the GCF, located in the media section of Chapter 5, what GCF is first factored out of all terms in the expression

*asked on May 2, 2016* -
## algebra

a woman drove a distance of 240km on the return journey she drove 20km/h faster and took two hnurs less. what was her speed on the outward journey?

*asked on February 16, 2016* -
## Math

how many hours will it take Wendy to make 4 2/3 batches of cookies if she can make 1 1/3 batches in 1 hour

*asked on January 24, 2016* -
## Chemistry

please balance this chemical equation iron +oxygen > iron (III) oxide +energy Fe + O2> Fe2 O3 + heat and light

*asked on December 10, 2015* -
## Lang Arts

The novel to kill a mockingbird feature a main character named scout. Scout is also the voice that tells the story. What point of view is used in the novel? A.First Person B.Third-Person Limited

*asked on August 11, 2015* -
## Peter nchabeleng

If you live only 800m away from the school. If she leaves her home at the sametime as Constance, how many minutes before Constance will she arrive

*asked on August 4, 2015* -
## Peter nchabeleng

If you live 3,5 km away from school. How long will it take you to walk to school

*asked on August 4, 2015* -
## Life sciences

Why are the fossils kept in a glass box in the museum?

*asked on July 31, 2014* -
## Statistics

Find the range and the standard deviation (correct to two decimal places). 77, 89, 96, 96, 102

*asked on May 16, 2014* -
## Finance

Jared has decided that he wants to build enough retirement wealth that, if he invests at 8% per year (compounded monthly), will provide him with $3,500 of monthly income for 30 years. To date, he has saved nothing, but he still has 25 years until he

*asked on March 29, 2014* -
## Finance

Mark has won a contest in which he will receive $10,000 at the end of each of the next 10 years and then $20,000 a year for the next 30 years after that. With an 8% discount rate, what is the present value of Mark's prize?

*asked on March 29, 2014* -
## Finance

You borrow $150,000 to purchase a new house. The bank offers you a special 20 year loan with a 7% interest rate and you will make annual payments. How large will each payment be? If you want to sell your house after 7 years, how much will you owe and need

*asked on March 29, 2014* -
## Math Geometry

Marisol is painting on a piece of canvas that has an area of 180 square inches. The length of the Painting is 1 1/4 times the width. What are the dimensions of the painting this is for elementary school so make it simple

*asked on March 7, 2014* -
## Math Geometry

Marisol is painting on a piece of canvas that has an area of 180 square inches. The length of the Painting is 1 1/4 times the width. What are the dimensions of the painting

*asked on March 7, 2014* -
## Math

If I swam 30 meters in 16 seconds how would I express this in a fraction? 16/30 or 30/16 and why?

*asked on January 14, 2014* -
## Physics

Consider the static equilibrium diagram below. What is the net force acting along the positive x-axis?

*asked on January 7, 2014* -
## physics

In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation potential

*asked on December 21, 2013* -
## Math2

A "quick picture" is an estimate than? 5 x 2.7 ..... 5 x 3= 15 Its been a long time since elementary school and I do not remember "quick picture" The question was How can you use a "quick picture" to find 5 x 2.7? the answer is 13.5.......an estimate would

*asked on December 5, 2013* -
## Math

How do you use a "quick picture" to find 5 x 2.7.

*asked on December 5, 2013* -
## science

An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same copper-containing compound?

*asked on October 23, 2013* -
## Algebra

How do I find the unknown digit to make this statement true 2.48 > 2.4 ____1 > 2.463

*asked on September 9, 2013* -
## Maths - Probability q2

Five cards are lettered A, B, C, D, E Three cards are chosen at random one after the other without replacement and are in the order shown below First, Second, Third What is the probability that the cards spell the word BED

*asked on May 13, 2013* -
## Math - Probability

in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy or a girl are chosen at random, what is the probability that both of them can ride a bicycle?

*asked on May 13, 2013* -
## math

in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy or a girl are chosen at random, what is the probability that both of them can ride a bicycle?

*asked on May 13, 2013* -
## enlish

correc the following sentences for subject-verb agreement,tens and fragment. 1. My cat it is very playful 2. when he thought he could afford to pay his own school fees. 3. This children keep making noise. 4. These are great news indeed; i can`t believe i

*asked on February 19, 2013* -
## Physics

The drawing shows six point charges arranged in a rectangle. The value of q is 9.27 µC, and the distance d is 0.17 m. Find the total electric potential at location P, which is at the center of the rectangle.

*asked on February 18, 2013* -
## Physics

Two particles each have a mass of 5.5 10-3 kg. One has a charge of +4.8 10-6 C, and the other has a charge of -4.8 10-6 C. They are initially held at rest at a distance of 0.88 m apart. Both are then released and accelerate toward each other. How fast is

*asked on February 14, 2013* -
## Physics 1

The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the

*asked on November 17, 2012* -
## ecoomics

If the multiplier is 4, a $10 billion increase in autonomous investment will cause a

*asked on November 16, 2012* -
## physics

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 1.1 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the

*asked on November 12, 2012* -
## physics

One of the new events in the 2002 Winter Olympics was the sport of skeleton (see photo). Starting at the top of a steep, icy track, a rider jumps onto a sled (known as a skeleton) and proceeds-belly down and head first-to slide down the track. The track

*asked on November 12, 2012* -
## physics

The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the

*asked on November 11, 2012* -
## Physics

A 7410-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the

*asked on November 11, 2012* -
## Physics

A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.10 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.30 107 J

*asked on November 11, 2012* -
## Physics

A 0.069-kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.95 m. With what speed does the arrow leave the bow?

*asked on November 11, 2012* -
## Physics

A cable lifts a 1060-kg elevator at a constant velocity for a distance of 39 m. What is the work done by each of the following?

*asked on November 11, 2012* -
## Physics

Each of the space shuttle's main engines is fed liquid hydrogen by a high-pressure pump. Turbine blades inside the pump rotate at 595 rev/s. A point on one of the blades traces out a circle with a radius of 0.02 m as the blade rotates. (a) What is the

*asked on November 8, 2012* -
## Physics

Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?

*asked on November 8, 2012* -
## physics

The blade of a windshield wiper moves through an angle of 90.0° in 0.31 s. The tip of the blade moves on the arc of a circle that has a radius of 0.59 m. What is the magnitude of the centripetal acceleration of the tip of the blade?

*asked on November 7, 2012* -
## Physics

In the figure below, an object, after being released from its circular path, travels the distance OA in the same time it would have moved from O to P on the circle. The speed of the object on and off the circle remains constant at the same value. Suppose

*asked on November 6, 2012* -
## Physics 1

The drawing shows a wire tooth brace used by orthodontists. The topmost tooth is protruding slightly, and the tension in the wire exerts two forces and ' on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 15.0

*asked on October 29, 2012* -
## Physics 1

The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 55600 N. The lift force generated by the rotating blade makes an angle of 21.0° with respect to the vertical. (a) What is the

*asked on October 29, 2012* -
## Physics

In the drawing, the weight of the block on the table is 384 N and that of the hanging block is 195 N. Ignore all frictional effects, and assuming the pulley to be massless. (a) Find the acceleration of the two blocks. m/s2 (b) Find the tension in the cord.

*asked on October 25, 2012* -
## chemistry

What is an open and closed sytem refer to in chemistry? thanks!

*asked on October 16, 2012* -
## Physics

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.16 105 m/s to a final velocity of +2.23 106 m/s while traveling a distance of

*asked on October 9, 2012* -
## physics

A 1720-kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 47.0 m?

*asked on October 9, 2012* -
## physics

A 1720-kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 47.0 m?

*asked on October 8, 2012* -
## physics

Several people are riding in a hot-air balloon. The combined mass of the people and balloon is 328 kg. The balloon is motionless in the air, because the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' force. If

*asked on October 4, 2012* -
## physics

Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 3.10 m. Two of the spheres have a mass of 3.20 kg each. The third sphere (mass unknown) is released from rest. Considering only the

*asked on October 4, 2012* -
## physics

A space traveler weighs 635 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?

*asked on October 4, 2012* -
## Physics

(a) Calculate the magnitude of the gravitational force exerted on a 488-kg satellite that is a distance of 1.95 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c)

*asked on October 4, 2012* -
## Physics

A bowling ball (mass = 7.2 kg, radius = 0.14 m) and a billiard ball (mass = 0.40 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other?

*asked on October 3, 2012* -
## Physics

Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the tests is an impact shock test, in which the box must

*asked on October 3, 2012* -
## Physics

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 914 N and the drag force has a magnitude of 1120 N.

*asked on October 3, 2012*

## Pages

**1**- 2