Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 332

**Physics**

During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 283 N on the wire. The left section of the wire makes an angle of 11.8° relative to the hor...

**physics**

Thank you

**physics**

Traveling at a speed of 18.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.690. What is the speed of the automobile after 1.41 s have elapsed? Ignore the effects of ...

**physics**

An electron is a subatomic particle (m = 9.11 x10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.11 x 105 m/s to a final velocity of 1.67 x 106 m/s while traveling a distance of 0.0654 m. The electro...

**math**

find to the nearest minute, all positive values in the interval 0° ≤ θ < 180° that satisfy the equation 2 tan^2 θ - tan θ = 3

**math**

find to the nearest minute, all positive values in the interval 0° ≤ θ < 180° that satisfy the equation 2 tan^2 θ - tan θ = 3

**physics**

A small rocket is fired directly upwards with an initial velocity of 100m/s, How many seconds will it take to reach its maximum height?

**Physics**

Under what conditions would an applied force increase the Kinetic energy of an object?

**Physics**

A 1.00e2kg crate is being pushed across a horizontal floor by a force of P that makes an angle of 30.0 degrees below the horizontal. The coefficient of Kinetic Friction is 0.200. What should be the magnitude of P, So that the network done by it and the Kinetic Frictional Force...

**physics**

A steroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5e4kg and the force causes the speed to change from 7100 to 5500m/s. (A) What is the work done by the force? (B) If the asteroid slows...

**Physics**

A husband and Wife take turns pulling their child in a wagon along a horizontal sidewalk. Each exerts a constant force and pulls the wagon through the same displacement. They do the same amount of work, but the husband's pulling force is directed 58 degrees above the horiz...

**statistics**

A secretary can type 12 names per 60 secods in an average classroom how long will it take her to type all the names

**physics**

In an automatic clothes dryer, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.31 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an angle of θ above...

**Physics**

A satellite moves on a circular earth orbit that has a radius of 6.4 106 m. A model airplane is flying on a 23-m guideline in a horizontal circle. The guideline is parallel to the ground. Find the speed of the plane such that the plane and the satellite have the same centripet...

**physics**

A racetrack has the shape of an inverted cone, as the drawing shows. On this surface the cars race in circles that are parallel to the ground, and the surface is at an angle θ = 25°. For a speed of 27 m/s, at what value of the distance d should a driver locate his car...

**physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (θ = 61.0°) Suppose the total mass of a chair and its occupant is 196 kg. the tension is 3961.97N Find the...

**physics**

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the b...

**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 that the radius of the...

**Physics**

A 260-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an acceleration of 0.80...

**Physics**

A 260-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an acceleration of 0.80...

**physics**

A 260-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.870, and the log has an acceleration of 0.80...

**physics**

The drawing shows box 1 resting on a table, with box 2 resting on top of box 1. A massless rope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes are W1 = 51.0 N, W2 =...

**physics**

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 17.0 N, what is the ma...

**Physics**

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.7m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 3.0m from the ...

**physics**

A net force of 25N is applied for 5.7s to a 12-kg box initially at rest. Waht is the speed of the box at the end of the 5.7s interval?

**physics**

A 20kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 80N and is directed at a angle of 30.0degrees above the horizontal. Determine the coefficient of kinetic friction.

**Physics**

At an instant when a soccer ball is in contact with the foot of a player kicking it, the horizontal or x component of the ball's acceleration is 810m/s^2 and the vertical or y component of its acceleration is 110m/s^2. The ball's mass is 0.43kg. what is the magnitude o...

**physics**

When a 58g tennis ball is served, it accelerates from rest to a speed of 45m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44cm. What is the magnitude of the net force acting on the ball?

**Physics**

A 343-kg boat is sailing 16.2° north of east at a speed of 1.98 m/s. Thirty seconds later, it is sailing 37.5° north of east at a speed of 3.76 m/s. During this time, three forces act on the boat: a 30.3-N force directed 16.2° north of east (due to an auxiliary eng...

**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 +5.21 105 m/s to a final velocity of +2.29 106 m/s while traveling a distance of 0.034 m. The electron'...

**physics**

Thank You

**physics**

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 9.8%. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is the...

**physics**

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 9.8%. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the planet and rmin is the...

**Physics**

A 343-kg boat is sailing 16.2° north of east at a speed of 1.98 m/s. Thirty seconds later, it is sailing 37.5° north of east at a speed of 3.76 m/s. During this time, three forces act on the boat: a 30.3-N force directed 16.2° north of east (due to an auxiliary eng...

**Physics**

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.0 m/s, at an angle of 47.0°...

**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 +5.21 105 m/s to a final velocity of +2.29 106 m/s while traveling a distance of 0.034 m. The electron'...

**Physics**

An airplane with a speed of 76.8 m/s is climbing upward at an angle of 48° with respect to the horizontal. When the plane's altitude is 560 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of...

**physics**

The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.0 m/s, at an angle of 47.0°...

**chemistry**

What are the acids in the house?

**Physics**

Derive an expression for the vertical position of a projectile in terms of its horizontal position. This sometimes called parametric equation or path equation for the projectile. I dont know how to get it please help. Thank you.

**Physics**

An 18-year-old runner can complete a 10.0-km course with an average speed of 4.39 m/s. A 50-year-old runner can cover the same distance with an average speed of 4.27 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time...

**Physics**

Can you think of any ways to measure instantaneous speed directly?

**Physics**

What equation gives the velocity as a function of time for an object with constant acceleration?

**physics**

What equation gives the position as a function of time for an object with constant acceleration?

**physics**

A dynamite blast at a quarry launches a chunk of rock straight upward, and 2.0s later it is rising at a speed of 15m/s. Assuming air resistance has no effect, calculate its speed A) at launch and B) 5.0s after lauch

**Physics**

In a historical movie, two knights on horseback start from rest 88.0m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.300m/s (squared), While Sir Alfred's has a magnitude of 0.200m/s (squared). Relative to Sir Geor...

**physics**

(a) Just for fun, a person jumps from rest from the top of a cliff overlooking a lake. In falling through a distance H, she acquires a certain speed v. Assuming free-fall conditions, how much farther must she fall in order to acquire speed 2v? Express your answer in terms of H.

**physics**

Two cars cover the same distance in a straight line. Car A covers the distance at a constant velocity. Car B starts from rest and maintains a constant acceleration. Both cars cover a distance of 487 m in 216 s. Assume that they are moving in the +x direction. Determine (a) the...

**physis**

The magnitudes of the four displacement vectors shown in the drawing are A = 13.0 m, B = 11.0 m, C = 12.0 m, and D = 27.0 m. Determine the magnitude and directional angle for the resultant that occurs when these vectors are added together.

**Physics**

A jetliner, traveling northward, is landing with a speed of 67 m/s. Once the jet touches down, it has 765 m of runway in which to reduce its speed to 5.1 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the positive direction to...

**physics**

An 18-year-old runner can complete a 10.0 km course with an average speed of 4.58 m/s. A 50-year-old runner can cover the same distance with an average speed of 4.36 m/s. How much later (in seconds) should the younger runner start in order to finish the the course at the same ...

**algebra**

Which is an example of the commutative property? A. –8 + (–13) = –13 + (–8) B. 11 + (–14 + 5) = (11 + (–14)) + 5 C. 16 + (–16) = 0 D. –(22 + 1) = –22 + (–1)

**football names**

What is the football name of this clue, seven squared?

**Chem**

using math expressions, define the following: Ka,pKa, pKb, Kb and pKw

**biostatistics**

A clinical trial is run to assess the effects of different forms of regular exercise on HDL levels in persons between the ages of 18 and 29. Participants in the study are randomly assigned to one of three exercise groups - Weight training, Aerobic exercise or Stretching/Yoga ...

**statistics**

Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of a significant correlation between number of ho...

**biostatistics**

7. Consider again the data in problem #6. Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of a si...

**biostatistics**

8. The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the difference in mean total cholesterol levels between treatments. New Drug (n=75) Pla...

**biostatistics**

Suppose we want to design a new placebo-controlled trial to evaluate an experimental medication to increase lung capacity. The primary outcome is peak expiratory flow rate, a continuous variable measured in liters per minute. the primary outcome will be measured after 6 months...

**history**

How did african slavery contributed to the economic growth of the british economy

**Math**

(x-A)(x+A)= x^2 - A^2 hence A^2 =x^2 - 2009 =16 A = square root of 16 = +4, -4

**Comm II**

When you write a definition of something, I was taught in school that you should not use the word you are defining in the definition. Does this still apply throughout a definition essay? If so, then how?

**biostatistics**

A studyis run to estimate the mean total cholesterol level in children 2 to 6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows: 185 225 240 196 175 180 194 147 223 Generate a 95% confidence interval for the true me...

**biostatistics**

among coffee drinkers, men drink a mean of 3.2 cups per day with a standard deviation of 0.8 cups. Assume the number of coffee drinks per day follows a normal distribution. a. What proportion drinks 2 cups per day or more? b. What proportion drink no more than 4 cups per day? ...

**CHEMISTRY!! NEED IMMEDIATE HELP PLEASE!!! **

a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...

**business Math**

simple interest 2430 times 0.06 times 1/12

**algebra**

trains A and B are traveling in the same direction on paraleel tracks. Train A is traveling at 80 miles per hour and train B is traveling at 88 miles per hour. Train a passes a station at 5:10 P.M. If train B passes the same station at 5:40 P.M., at what time will train B catc...

**Chemistry urgent **

How is pushing down the accelerator pedal resulting in a faster consumption of fuel in the engine concentration?

**Chemistry urgent **

How is pushing down the accelerator pedal resulting in a faster consumption of fuel in the engine concentration?

**Chemistry 10**

The accelerator pedal in the car is pressed, resulting in a faster consumption of fuel in the engine. Now according to previous answers to this question the answers concentration but I do not understand how. I though concentration is the amount of a substance dissolved in a so...

**calc**

a machine can produce 12 clay figure per hour.it costs $750 to set up the machine and $6 per hour to run the machine.each clay figure requires $2 of material to produce.if each clay figure will sell for $10 charged,express the revenue cost,and profit in producing x clay figure...

**calc**

water is stored in a tank in the shape of an interval cone of height 10ft and diameter 6ft.express the volume of water in the tank as a function of the height h of the water level.

**calc**

a cylindrical container with a circular base has a surface area of 64ft squared.express its volume as a function of its radius

**calc**

an open box is to be made from a 4 ft by 5 ft piece of cardboard by cutting out squares of equals sizes with width x ft from the four corners and bending up the flaps to form sides.express the volume of the open box as a function of x what is the domain of the function

**calc**

a closed box has a base twice as long as it is wide.if its volume is 100 in cubed,express its surface area as a function of the width x of its base.

**calc**

a 1 mile racetrack has two semicircula ends connected by straight lines.express the area enclosed by the track as a function of its semi circular radius.determine its domain.

**calc**

a 1 mile racetrack has two semicircula ends connected by straight lines.express the area enclosed by the track as a function of its semi circular radius.determine its domain.

**calculus**

a piece of wire 12 inches long is to be used to form a square and or a circle.determine a function that expresses the combined area of both figures.what is its domain?

**calculus**

a farmer has a 1500 feet of fencing in his barn.he wishes to enclose a rectangler pen,subdivided in two regions by a section of the fence down the middle,parallel to one side of the rectangle.express the area enclosed by the pen as a function of its width x.what is the domain ...

**english**

NO IDEA AT ALL

**com 155**

Review the passage below, which contains 20 errors. Identify these errors by marking each of the errors in bold, and make your correction in parentheses after the error. Example: My cars interior is black. This must be marked as follows: My cars (car’s) interior is black....

**math**

Rewrite with positive exponents. Assume that even roots are of nonnegative quantities and that all denominators are nonzero. (2x/y2)^-4

**math**

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -15r + 12s = 24 30r – 24s = 48

**english**

One of the four underlined sections may mark an error in punctuation. Choose the option that marks the error in punctuation. If there is no error, choose No error. For most of us who are not reading specialists, learning to read is a mysterious process; why a child is ready to...

**Punctuation**

Paloma did not make it to work for her car, broke down on the freeway. Is this better? The hardware store down the street, which had been paved recently, is open until midnight five days a week. Many students anticipate spring break but, Luis looks forward to winter vacation m...

**Punctuation**

Is this correct? Even though it is almost summer, we still have overcast skies and light rain. The neighbors’ new dog is, small, quiet and shy. The oil from Eucalyptus trees, which are native to Australia, is known for its medicinal properties. Paloma did not make it to w...

**english**

Paloma did not make it to work for, her car broke down on the freeway.

**spanish**

fill in the blank ?es el libro _____profesor? no, es mi libro. la clase ____ profesor de español es muy interesante. la mochila _____muchacha es rosado. yo soy ___ estados unidos. ?son los bolígrafos de teresa? no, son ____ profesora. please help

**spanish**

miro ______ pizarra. what goes in the blank? voy _______ escuela. voy__________ laboratorio. escucho ___ profesor cuando el habla miro ____ alumno guapo. :)

**English**

Thank you!!!

**English**

Thanks, I need some goos point to make it better.

**English**

It is very important because Canada is a nation of immigrants. I believe that there is an opportunity to learn from everyone in this world and everyone contributes to making Canada the country that it is.

**English**

why diversity is or is not an important element of our Canadian culture in your opinion?

**Penn Foster**

i need the answer from 00701300

**math**

What is the meaning of angle of depression and angle of elevation?

**geograohy**

state if each sentences is climate or weather the is so hot but last night was cool

**Project Management **

Search the web for project planning tools and describe at least 2. download a demo to two, and build a project so you can see the different PM charts(Grantt,CPM, Pert, etc.). Comment on the ease in in which you were able to build each of the charts. Which tool would you recomm...

**grammar**

Is this correct? Even though it is almost summer, we still have overcast skies and light rain

**statistic**

A die is rolled once. The probability of obtaining an odd number is

**Chemistry Lab**

Which of the following would NOT be a factor for a solute to dissolve in water? A. A solute separates into ions which are supported by hydration. B. Electrostatic attraction between the partially charged atoms in water molecules and the solute. C. A solute has a higher formula...

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