Friday

September 30, 2016
Total # Posts: 2,819

**Physics**

In a skating stunt known as "crack-the-whip", a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 76.7 kg and is 6.18 m from the ...

*March 29, 2016*

**Physics**

A 9.37 kg monkey is hanging by one arm from a branch and swinging on a vertical circle. As an approximation, assume that the radial distance between the branch and the point where the monkey's mass is located to be 86.8 cm. As it swings through the lowest point on the ...

*March 29, 2016*

**Physics**

A car travels at a constant speed around a circular track whose radius is 2.59 km. The car goes once around the track in 380 s. What is the magnitude of the centripetal acceleration of the car?

*March 29, 2016*

**Physics**

Read the equation wrong, I got it. Sorry!

*March 29, 2016*

**Physics**

I know that Fc= mv^2r, and I keep getting r=.7154 but it says it's incorrect. What am I doing wrong? Help please!

*March 29, 2016*

**Physics**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.21 m/s, and an 75.7 kg person feels a 558 N ...

*March 29, 2016*

**chem**

Arrange the following compounds in order of increasing boiling point. butanal 1-butanol diethylamine tartaric acid butane butanoic acid and can you please explain why?

*March 28, 2016*

**Math**

Points J and K, plotted on the coordinate grid, are two vertices of rectangle JKLM. Rectangle JKLM has an area of 7 square units. Point J is located at (2, 1) and point K is located at (-5,1) each vertex of the rectangle is located at a point that has integer coordinates. Part...

*March 26, 2016*

**chemistry**

The formation constant* of [M(CN)4]2– is 7.70 × 1016, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.040 M NaCN solution. What is the concentration of M2 ions at equilibrium?

*March 25, 2016*

**Physics**

Block B has a mass of 3.40kg and is moving to the left at a speed of 4.20m/s. Block A has a mass of 6.40kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should the velocity of the Block A be in order to have the two blocks move to the...

*March 23, 2016*

**Physics**

Block B has a mass of 2.20kg and is moving to the left at a speed of 2.30m/s. Block A has a mass of 2.70kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should be the velocity of Block A in order to have the two blocks remain at rest ...

*March 23, 2016*

**Math**

If adriana drew 20 pitchers and 3/4 of them are in art class how many pitchers did adriana draw in art class

*March 23, 2016*

**Physics**

A 63-kg ice-skater glides with a speed of 10 m/s toward a 14-kg sled at rest on the ice. The ice-skater reaches the sled and holds on to it. The ice-skater and the sled then continue sliding in the same direction in which the ice-skater was originally skating. What is the ...

*March 22, 2016*

**Physics**

A 64.8 kg ice skater is skating along in a straight line (in the positive direction) at 9.2 m/s when he bends down and scoops up his 24.4 kg doggy sitting still on the ice. What will be the new velocity of the dog-n-skater?

*March 22, 2016*

**Physics**

A car of mass 422 kg is moving 36.0° North of East at a speed of 15.4 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction). What is the east-west component of the momentum of the car? I already figured out the first question ...

*March 15, 2016*

**Physics**

A car of mass 422 kg is moving 36.0° North of East at a speed of 15.4 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction)

*March 15, 2016*

**Physics**

Suppose a 300–g kookaburra (a large kingfisher bird) picks up a 84.0–g snake and raises it 2.30 m from the ground to a branch. How much work did the bird do on the snake? I know that W=deltaPE, and PE=mgh. I keep getting 1046.64. Please help!

*March 10, 2016*

**calculus**

water is being siphoned from a cylindrical tank of radius 10m into a rectangular tank whose base measures 20m by 15m. if the depth of the water in the cylindrical tank in decreasing at a rate of 2m/s, at what rate is the depth of the water increasing in the rectangular tank

*March 10, 2016*

**Math**

Marco and his friends bought game tokens for $15 and three admission ticket. Determine if each statement below is true or false. If each admission ticket costs $2.50, then Marco and his friends spent $22.50 in all. True or False

*March 3, 2016*

**Math**

its D

*March 3, 2016*

**Algebra**

Two trains, one going from Boston to New York and the other going from New York to Boston, started their trips at exactly same time. Speed of the first train was 10 miles per hour less than twice the speed of the second train. How far from Boston station have they met, if the ...

*March 1, 2016*

**Physics**

3. A skater with an initial speed of 7.6 m/s is gliding across the ice. The coefficient of friction between the ice and the skae blades is μk=0.1. a. Find acceleration of the skater b. How foar will the skater travel before coming to rest

*February 29, 2016*

**Math**

Six year old Rosie wants to write down all counting numbers up to one thousand. When she finished writing 12, she had 15 digits. Rosie gave up after she had correctly written 2358 digits. What was the last number she wrote?

*February 27, 2016*

**Physics**

In the nail puller shown in the figure below you exert a force 49.6 cm from the pivot and the nail is 1.90 cm on the other side. What minimum force must you exert to apply a force of 1460 N to the nail to pull the nail up?

*February 26, 2016*

**Physics**

A 83.2-kg man stands on his toes by exerting an upward force through the Achilles tendon, as in the figure below. What is the force in the Achilles tendon if he stands on one foot?

*February 26, 2016*

**Physics**

Even when the head is held erect, as in the figure below, its center of mass is not directly over the principal point of support (the atlant-ooccipital joint). The muscles at the back of the neck should therefore exert a force to keep the head erect. That is why your head ...

*February 26, 2016*

**Physics**

What is the magnitude of the momentum of the 0.057-kg tennis ball when it travels at a speed of 29 m/s? Earth is the frame of reference.

*February 25, 2016*

**Physical science**

a balloon has a volume of 0.5 L at 20 degrees celsius. what will the volume be if the balloon heated to 150 degrees celsius? assume constant pressure and mass. I got 0.7218 L.

*February 21, 2016*

**Math**

A piece of ribbon is 7 1/2in. long. If a piece 2 3/16in. long is cut off, how long is the remaining piece?

*February 21, 2016*

**Physics**

Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over a frictionless, massless pulley. Block B hangs down vertically. When the two blocks are released, Block B accelerates downward at a rate of 2.030 m/s2. What is the ...

*February 18, 2016*

**Physics**

The initial velocity of a 2.75 kg block sliding down a frictionless inclined plane is found to be 1.25 m/s. Then 1.05 s later, it has a velocity of 5.31 m/s. What is the angle of the plane with respect to the horizontal? I keep trying to use sine and cosine but I can't ...

*February 17, 2016*

**chemistry**

why are there only certain colours in an atomic emission spectra?

*February 16, 2016*

**Physics**

A 4.96 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.7N at an angle theta=16.0degrees above the horizontal. What is the magnitude of the acceleration of the block when the force is applied? I know a=F/m

*February 16, 2016*

**Physics**

Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 8 kg, m2 = 33 kg, and m3 = 49 kg. The pulling force is equal to T3 = 89 N. What is the ...

*February 16, 2016*

**Physics**

An elevator (cabin mass 600 kg) is designed for a maximum load of 2700 kg, and to reach a velocity of 3.4 m/s in 5 s. For this scenario, what is the tension the elevator rope has to withstand? I know I have to multiply the mass by the acceleration. I'm having a hard time ...

*February 16, 2016*

**chemistry**

Iron can be produced by the reduction of iron(III) Oxide by carbon monoxide: Fe2O3 + 3CO -> 2FE +3CO2 a) what maximum mass of CO2 could be produced from the complete reduction of 14.7g of Fe2O3? b) if 8.73g of CO2 gas was actually collected, what percentage yield of the ...

*February 15, 2016*

**Physics**

A block of weight 30.9 N is hanging from a rope. The tension from the rope is pulling upward on the block. The block is accelerating downward at a rate of 1.20 m/s2. What is the magnitude of the tension in the rope? I found the mass of the block to be 25.75 kg; however, I'...

*February 9, 2016*

**Physics**

A block of weight 30.9 N is hanging from a rope. The tension from the rope is pulling upward on the block. The block is accelerating downward at a rate of 1.20 m/s2. What is the magnitude of the tension in the rope?

*February 9, 2016*

**government**

Well, I think that we should abolish it because of the numerous scandals we've had and because I think it's not needed anymore but we're doing a debate on it and I was just wondering if there would be any other reasons that would help my case be stronger.

*February 9, 2016*

**government**

Should we abolish or reform the senate in Canada?

*February 9, 2016*

**pre-calculus**

x|x-3|<2 I did x(x-3)<2 or x(x-3)<2 and simplified it to x^2-3x<2 and am not sure how to simplify it further and express it in interval notation. Help!

*February 8, 2016*

**Physics**

We study the three point charges shown in the figure. They are held at the corners of an equilateral triangle with ℓ = 0.9 m. What is the electric potential energy of the system of three point charges? Use for the three charges q1 = +2Q, q2 = −3Q, and q3 = +Q, ...

*February 7, 2016*

**Physics**

A supertanker (mass = 1.90E+8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.34E+5 N. Determine the magnitude of the resistive force exerted on the tanker by the water.

*February 4, 2016*

**Physics**

A 1550 kg car is traveling with a speed of 12.4 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 50.3 m? I found the force of the car to be 14700 by using F=ma. I am confused on what to do with the rest of the ...

*February 4, 2016*

**Physics**

Three students converge on the last textbook in the store. All three grab it and begin to pull in the directions shown in the above figure. Student A exerts a force of 77.64 N, student B pulls with a force of 18.52 N, and student C pulls with a force of 66.43 N at an angle &#...

*February 4, 2016*

**Physics**

A force vector points at an angle of 50.8° above the +x axis. It has a y component of +282 newtons. Calculate the magnitude of the force vector.

*February 4, 2016*

**Physics**

A rocket is fired at a speed of 76.4 m/s from ground level, at an angle of 61.0° above the horizontal. The rocket is fired toward an 10.6 m high wall, which is located 26.2 m away. By how much does the rocket clear the top of the wall?

*February 4, 2016*

**science**

What is the relationship between the major body systems

*February 4, 2016*

**Physics**

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 10.1 m/s at an angle of 62.4° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed ...

*February 3, 2016*

**physics**

I don't understand. derive a general equation that will predict the horizontal range of a projectile that is fired from one vertical position and ends at any other vertical position with an initial velocity, V1, at an angle, pheta, from the horizontal. The equation should ...

*February 3, 2016*

**Math**

The question says to simplify it

*February 3, 2016*

**Math**

(5 root 3y) over (root10 + 2)

*February 3, 2016*

**Physics**

A block of weight 41.8 N is hanging from a rope. The tension in the rope is 24.4 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block? I know the direction would be downwards, since the tension of the rope is less than the weight...

*February 2, 2016*

**Pysics**

A block of weight 41.8 N is hanging from a rope. The tension in the rope is 24.4 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block? I know the direction would be downwards, since the tension of the rope is less than the weight...

*February 2, 2016*

**Physics**

A block of mass 4.11 kg is hanging from a rope. The tension in the rope is 23.5 N, pulling upward on the block. What is the magnitude and direction of the acceleration of the block? F=ma 23.5=4.11a The result was 5.72 and was not correct. Please help!

*February 2, 2016*

**math**

What is 34567÷48583829×57383920=

*February 2, 2016*

**Pre-calc**

Boat A leaves a dock headed due east at 1:00PM traveling at a speed of 13 mi/hr. At 2:00PM, Boat B leaves the same dock traveling due north at a speed of 20 mi/hr. Find an equation that represents the distance d in miles between the boats and any time t in hours for t≥1...

*January 28, 2016*

**Social Studies/English**

Words describing Midewin Thank you!

*January 24, 2016*

**math**

A billboard is 4.0 meters by 2.5 meters. A scale diagram of the billboard must fit in a space that is 15 centimeters by 12 centimeters. Write a reasonable scale for the scale diagram.

*January 14, 2016*

**Physics **

at the moment when a shot putter releases a 4kg shot the shot is 1.25 m above the ground and travelling at 7 m/s. it reaches a maxium height of 3.7 m above the ground and then falls to the ground. air resistance is negligible and the shot goes straight up and then comes back ...

*January 8, 2016*

**p.e**

I think it's D

*January 8, 2016*

**math**

$77

*January 7, 2016*

**Math - Ms. Sue, Check!**

It's B

*January 7, 2016*

**This math question is confusing.**

A set of hemispherical bowls are made so they can be nested for easy storage. The largest bowl has a radius of 30 cm and each successive bowl has a radius 90% of the preceding one. What is the radius of the tenth bowl? there is a picture, sorry i cant put the picture but can ...

*January 3, 2016*

**Website Question**

Will the website be supporting pictures soon? like take a pic of your problem then upload it to the website then someone will try and solve it?

*January 1, 2016*

**Math**

Solve 2 - 5/x^2 - x - 6 = x + 3/x + 2 . Identify all non-permissible values.

*January 1, 2016*

**physics**

Yes very much so Thankyou Henry

*December 23, 2015*

**physics**

How would you explain this in 100 or so words so I can get a full comprehension of the question? Much appreciated! Please help me: discuss whether or not it is possible for an object to be increasing in speed as its acceleration is decreasing. For either position you take, use...

*December 23, 2015*

**Physics**

oh I apologize. It wasn't loading on my device. Thankyou Mr.Damon

*December 23, 2015*

**Physics**

I reposted it again because I wasn't sure if anyone got it.

*December 23, 2015*

**Physics**

An astronaut is stranded on another planet with UNKNOWN GRAVITY. He conducts two experiments. In the first, he drops a rock from a cliff and he finds that it takes the rock 4.15 seconds to reach the ground at the base of the cliff. In the second experiment, he throws the rock ...

*December 23, 2015*

**physics 1**

An astronaut is stranded on another planet with UNKNOWN GRAVITY. He conducts two experiments. In the first, he drops a rock from a cliff and he finds that it takes the rock 4.15 seconds to reach the ground at the base of the cliff. In the second experiment, he throws the rock ...

*December 23, 2015*

**English **

What is the adverbial in the following sentence: Dionne collected shells from the beach

*December 19, 2015*

**physics**

What must be the radius of an unbanked (flat) curve so that a car can safely travel at a maximum speed of 39 m/s? The coefficient of static friction is 0.70.

*December 18, 2015*

**physics**

What must be the radius of an unbanked (flat) curve so that a car can safely travel at a maximum speed of 39 m/s? The coefficient of static friction is 0.70.

*December 18, 2015*

**Algebra**

The area of a rectangular piece of plastic is 70 square millimeters. The perimeter is 34 millimeters. What are the dimensions of the piece of plastic?

*December 17, 2015*

**Math **

A number, plus one third itself, plus one eighth of itself, equals 70. What is the number?

*December 11, 2015*

**physics**

Water is leaking out of an inverted conical tank at a rate of 10700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...

*December 10, 2015*

**Statistics**

A US travel data center survey of 1500 adults found that 42% of the respondents stated that they favor historical sites as vacations find the 95% confidence interval of the troop portion of all adults who favor historical sites as vacation

*December 10, 2015*

**Health**

so whats the d*** answer

*December 9, 2015*

**Health**

it is D

*December 9, 2015*

**Math**

what is the amount of orange juice, written as a fraction grater than 1, that is used in the recipe? 1/2 cup frozen strawberries 1/2 cup frozen peaches 1/4 cup vanilla yogurt 1 1/2 cups orange juice

*December 8, 2015*

**Reading**

The metaphor in te fiesta stands is uses to emphasize that the

*December 6, 2015*

**English**

Directions: Identity the participle or participle phrase and the words that they modify: The horseman is the ghost of a beheaded soldier who appears at night. I am thinking beheaded is the participle that modifies the soldier or is it a phrase beheaded soldier who appears at ...

*December 6, 2015*

**health**

What is an example of a response that someone with BDD might give after receiving a successful cosmetic surgery?

*December 4, 2015*

**Bridgeway Academy**

Math A fish aquarium has a capacity of 2 gallons of. If it was already filled with two quarts plus one pint of water, how much water would need to be added to completely fill the tank?

*December 4, 2015*

**math**

mjcknm;dmkvfkb k b

*December 1, 2015*

**Chemistry**

Calculate the heat released when 1.00L of Cl2 (g) with a density of 1.88g/L reacts with an excess of sodium metal at 25 degrees C and 1 atm to form sodium chloride.

*November 30, 2015*

**Circular Motion Physics**

A coin with mass 3.1 grams is at rest atop a wooden block of mass 20 grams. The block is on a spinning platform with a 12 centimeter radius. The coefficients of friction between the platform and the wooden block are μs = 0.75 and μk = 0.64 The coefficient of friction...

*November 24, 2015*

**Physics**

A rope which is 7 meters long is laid out on a horizontal table. (a) Assuming that the coefficient of static friction between the rope and the top of the table is 0.5, show that the rope will begin to slide if at least 3 meters of it hangs off the edge. (b) Once it starts to ...

*November 24, 2015*

**MATH HELP**

What pattern rule would have a trend line that starts at the same vertical intercept (y-intercept) but has a different steepness?

*November 24, 2015*

**Science**

what do you round to find the mass number of the most common isotope of the element?

*November 17, 2015*

**Math-Sue**

18*2.5=45 feet 1 yard=3 feet

*November 17, 2015*

**math**

Brandon bought a computer monitor that cost $150. He had to pay 6% tax. How much did Brandon pay in tax?

*November 17, 2015*

**French**

Did I say this right or is this grammatically correct? _______________________________________ English: However, everything was a dream. French: Cependant , tout était un rêve

*November 16, 2015*

**Physics**

A car starts rolling down a 1-in-6 hill (1-in-6 means that for each 6 m traveled along the road, the elevation change is 1 m). How fast is it going when it reaches the bottom after traveling 70 m ? Assume an effective coefficient of friction equal to 0.10

*November 15, 2015*

**Physics**

A roller coaster reaches the top of the steepest hill with a speed of 7.0 km/h . It then descends the hill, which is at an average angle of 44 ∘ and is 30.0 m long. Estimate its speed when it reaches the bottom. Assume μk=0.18.

*November 15, 2015*

**French**

I numbered each sentence to make it clear so I know which one you refer to that I need to change to make the sentence clear and correct. ____________________________________ 1.) Il était une fois, il y avait une fille qui s’appelait Azirah. 2.) D’abord, elle ...

*November 14, 2015*

**French**

Can someone help me fix my sentences or suggest any changes. This has to be in past tense and make sense. I think it make sense overall. The 2nd paragraph contains 5 main conditionals! Did I use those right? .. Any help at all would help me lots!! Thanks. ...

*November 14, 2015*

**Math**

Joan has two similar rectangular shaped pieces. One has with 4 inches in length 6 inches and the other has a width of 4 inches period what is the area of the larger rectangle piece. use proportions

*November 12, 2015*