# Posts by Sierra

Total # Posts: 297

**Geometry**

The vertices of a triangle are P(-3,8), Q(-6, -4), and R (1, 1). Name the vertices of R (smaller letters)y-0 (triangle PQR). A. P'(-3, 8), Q'(-6,-4), R'(1,1) B. P'(-3,-8), Q'(-6,4), R'(1,-1) C. P'(3,-8), Q'(6,4), R'(-1,-1) D. P' (3,8), Q...

*March 26, 2014*

**Algebra**

6/z-3=8/5 help please.

*March 21, 2014*

**Math**

Line LM is the mid-segment of rectangle ABCD. AB=x+8, LM = 4x+3, and DC=243. What is the value of x?

*March 11, 2014*

**Math**

Line LM is the mid-segment of rectangle ABCD. AB=72 and DC=104. What is LM? A.176 b. 88 c.98 d.32

*March 11, 2014*

**Math**

In the rhombus, angle 1=15x, angle 2=x+y, and angle 3=30z. Find the value of each variable.

*March 10, 2014*

**Math**

Line DF bisects angle EDG. Find the value of x. Line EF has 9x+114. Line FO has 15x. angle FDG has 32 degrees.

*March 10, 2014*

**Geometry**

What is an equation in point-slope form for the line perpendicular to y=2x+13 that contains (8,-4)?

*March 9, 2014*

**Social Studies 10**

"Was the conflict over the Red River Settlement inevitable? Provide reasons for your answer." <- exact

*March 6, 2014*

**Math**

Can you please check my answers? Thank you! 18 out of 25 people love chocolate what percentage of people do not love chocolate? I got 28% 15% of the Chemistry class did not pass their chapter 7 test if the class has 38 students how many students did not pass their chapter 7 ...

*November 4, 2013*

**math**

How do I simplify -(5x+5)-4+8x

*October 22, 2013*

**math**

How do I simplify -9-(12-3x)

*October 22, 2013*

**us history**

Which of the following is true of the Spanish-American War? A. Racial tensions were suspended for the duration of the war. B. About one in ten American soldiers were black. C. Black soldiers referred to black Cubans as "Smoked Spaniards." D. The black soldiers who ...

*October 1, 2013*

**English 11A**

i need to write a story for English and i have to use seven comma rules along with my 20 vocabulary words. abomination blanched conjure contentious contiguous corroborate dally defamation enthrall evasive imperceptible inaudible inquisition licentious prodigious quavering ...

*September 16, 2013*

**Math 4th grade**

Write the word form and the value of the underlined digit 76,239 the 6 is underlined

*August 23, 2013*

**Physics**

thank you for your help

*August 22, 2013*

**Physics**

Electrons on a radio broadcasting tower are forced to oscillate up and down an antenna 535,000 times each second. Show that the wavelength of the radio waves that are produced is 561 m.

*August 22, 2013*

**math**

I say tues at 1am

*April 30, 2013*

**Math: Please check my answers**

you guys are both right. #5 could be bothA or C.. just pay attention to the actual answer and not the letter because they are switched around. 5. is -2x^3-6x^2+9x

*January 28, 2013*

**Physics, help!**

A heat engine absorbs 126 kcal of heat and exhausts 77 kcal of heat in each cycle. Calculate the efficiency (as a percentage) An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its...

*January 18, 2013*

**Help me! Physics**

A block of aluminum with a mass of 2.6 kg is at 13C and comes in contact with a hot block of copper with a mass of 10.2 kg at 93C. What is the equilibrium temperature in Celsius degrees? caluminum = 0.22 kcal/kgC ccopper = 0.093 kcal/kgC

*January 17, 2013*

**Math**

The Commplement of angle v 52 more than angle v. find the measure of angle v.

*January 9, 2013*

**Pre-Algebra**

2x = 3(1/3x + 6) 2x = x + 18 x = 18

*January 7, 2013*

**Physics-Momentum**

Baseball 0.14 kg moving at 35 m/s. Momentum of the ball? this should be easy b/c i know p=m*v but i get 4.9 kgm/s and it's wrong.....

*January 7, 2013*

**Please I'm begging someone help me with biology**

Thank you so much for your help I really need to know that

*December 13, 2012*

**Please I'm begging someone help me with biology**

I need help with listing two ways that single - celled fungi are different from bac-terial cells??? I'm so clueless I'm begging anyone to help me thanks

*December 13, 2012*

**Please I'm begging someone help me with biology**

I need help with listing two ways that single - celled fungi are different from bac-terial cells??? I'm so clueless I'm begging anyone to help me thanks

*December 13, 2012*

**math 6th grade proportions**

Sorry if I may be bugging you,but this homework is veryy hard for me!Karen gets 6 out of every 8 questions on a test correct.If she gets 27 questions correct,how many questions are on the test?

*December 10, 2012*

**math 6th grade proportions**

Thank-you!! :)

*December 10, 2012*

**math 6th grade proportions**

Hello,Umm I need Alot of help on this problem:Emma runs for 18 minutes out of the 45 minutes she spends exercising each morning.One morning she spends 70 minutes exercising.If her rates stay the same how many minutes will she spent running>PLEASE HELP A.S.A.P!!!!!!!!

*December 10, 2012*

**math**

Laura has 4 CDS in her room. They are 1/5 of her whole collection. How many CDs are in Laura's whole collection?

*December 10, 2012*

**Physics ASAP**

A block of weight 20 N is pushed with a force of 30 N through a horizontal distance of 5 m using a stick which is at an angle of 37° from the horizontal as shown. The coefficient of kinetic friction µk between the table and the block is 0.25. For your own reference, ...

*December 10, 2012*

**math**

write a number and a fraction greater than 1 that name the part filled

*December 5, 2012*

**history**

8. The Puritan _______ became the governor of the Massachusetts Bay Colony.

*December 3, 2012*

**Geology**

Which of the three rock families occurs most in new York state?

*November 27, 2012*

**Geology**

What observable characteristic is present with banding of metamorphic rocks that is not present in the layering of clastic sedimentary rocks?

*November 27, 2012*

**Physics**

A cylindrical carnival ride is spinning with a frequency of 0.5 Hz in a circle of radius 3 m which allows a 60 kg person to “stick” to the side of the ride as it spins. T = 2s v = 9.42 m/s A) Find the normal force exerted on the person. B) What minimum µs is ...

*November 27, 2012*

**Physics Please Help ASAP**

thank you so much! super helpful i didn't realize i was overlooking the radius of earth!

*November 26, 2012*

**Physics Please Help ASAP**

Suppose the space shuttle is in orbit 390 km from the Earth's surface, and circles the Earth about once every 92.4 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...

*November 26, 2012*

**physics**

there's no question, just a bunch of information about the situation

*November 26, 2012*

**Physics ASAP**

Suppose the space shuttle is in orbit 390 km from the Earth's surface, and circles the Earth about once every 92.4 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...

*November 26, 2012*

**Physics ASAP**

Use the following numbers for this question. MEarth 5.98e+24 kg MJupiter 1.9e+27 kg MSun 2e+30 kg Earth-Sun distance 150000000000 m Jupiter-Sun distance 778000000000 m rE 6380000 m rJ 69000000 m G = 6.67e-11 Nm2kg-2 the acceleration due to gravity at the surface of Jupiter has...

*November 18, 2012*

**Trig**

Give: a=alpha B=beta csc a= 2 pi/2<a<pi secB=-3 pi/2<B<pi 1)find sin(a+B) 2)find tan(a-B) 3)cos B/2 4)sin a/2

*November 7, 2012*

**trig**

How do you find the exact value of sin 5pi/8?

*November 7, 2012*

**Physics**

a quaterback throws a ball to a stationary reciver wo is 15.2m down the feild. the football is thrown at an initial angle of 42 dagrees. acceleration is 9.81m/s^2. what is the initial speed that quaterback must throw the ball to hit the reciver?

*October 23, 2012*

**physics**

Consider again the problem of a car traveling along a banked turn. Sometimes roads have a "reversed" banking angle. That is, the road is tilted "away" from the center of curvature of the road. If the coefficient of static friction between the tires and the ...

*October 1, 2012*

**physics**

A compact disc spins at 2.7 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 2.8 cm from the CD's center.

*October 1, 2012*

**physical science**

what is the density of a peice of wood that has a mass of 25.0 grams and a volume of 29.4cm cubes?

*September 13, 2012*

**ENGLISH**

3 - 5 are wrong

*September 5, 2012*

**math**

would you use perimeter or area to find the quanity of track needed for a tabletop railroad

*August 22, 2012*

**Physics**

A snake is sunning itself on a rock. (a) If the snake is 0.5 m long, what is the approximate amount of radiation it absorbs from the Sun in 11 min? (Assume the snake has a cylindrical shape and ignore both ends, a radius of 0.03 m, and a mass of 2.1 kg. Assume also that the ...

*July 31, 2012*

**Physics**

The intensity of sunlight at the the top of the Earth's atmosphere is about 1350 W/m2. (The intensity at the surface of the Earth is somewhat smaller due to absorption and reflection by the atmosphere.) What is the total power emitted by the Sun?

*July 31, 2012*

**Physics**

Use the exact values you enter in previous answer(s) to make later calculation(s). Energy-efficient windows are constructed with two panes of glass separated by an air gap (see figure below). In a typical window of this type, the air gap makes a huge difference in the rate of ...

*July 31, 2012*

**Physics**

A rectangular aluminum plate has an area of 0.41 m2 at 23°C. If it is heated until its area has increased by 4.4 10-6 m2, what is the final temperature of the plate? °C

*July 31, 2012*

**Physics**

Your swimming pool is square and 4.9 m on a side. It is 3.9 m deep in the morning. If the temperature changes by 44°C during the afternoon, how much does the depth of the water increase?

*July 31, 2012*

**Physics**

If you combine 34 kg of ice at 0°C with 80 kg of steam at 100°C, what is the final temperature of the system? °C

*July 31, 2012*

**Physics**

You drop 378 g of solid ice at −35°C into a bucket of water (1,200 g) at 45°C. Eventually, the ice all melts, and the entire system comes into thermal equilibrium. Find the final temperature of the system.

*July 31, 2012*

**Physics**

An ice cube of volume 17.7 cm3 is initially at a temperature of -19.3°C. How much heat is required to convert this ice cube into steam?

*July 31, 2012*

**Physics**

How much heat is required to raise the temperature of a 4.3-kg block of steel by 48 K? (The specific heat of this steel is 450 J/kg · K.)

*July 31, 2012*

**Physics**

A tank of water sits at the edge of a table of height 1.4 m. The tank springs a very small leak at its base, and water sprays out a distance of 1.2 m from the edge of the table. What is the water level h in the tank? (Assume the tank is open to the air at the top.)

*July 25, 2012*

**Physics**

Water is flowing through a pipe (area 4.0 cm2) that connects to a faucet adjusted to have an opening of 0.57 cm2. If the water is flowing at a speed of 5.3 m/s in the pipe, how long does it take for water from the faucet to fill a bucket of volume 0.11 m3?

*July 25, 2012*

**Physics**

Two metal blocks are attached by a cable as shown in the figure below and are submerged at rest near the surface of a lake. If the volumes are V1 = 2.1 m3 and V2 = 1.1 m3, what is the total buoyant force on the two blocks?

*July 25, 2012*

**Physics**

You want to design a helium-filled balloon that will lift a total payload of 1225 kg. What volume of helium is needed to just barely lift this payload?

*July 25, 2012*

**Physics**

A block of mass 20 g sits at rest on a plate that is at the top of the fluid on one side of a U-tube as shown below. The U-tube contains two different fluids with densities ρ1 = 965 kg/m3 and ρ2 = 550 kg/m3 and has a cross sectional area A = 5.5 10-4 m2. The surfaces...

*July 25, 2012*

**Physics**

A syringe has an area of 1.4 cm2 at its barrel and then narrows down to an area of 0.08 mm2 at the needle end. If a force of 5.5 N is applied to the syringe, what is the force produced at the tip of the needle?

*July 25, 2012*

**Physics**

A bucket is filled with a combination of water (density 1,000 kg/m3) and oil (density 700 kg/m3). These fluids do not mix. (The oil will float on top of the water.) If the layer of oil is 63 cm tall, what is the pressure at the interface between the oil and the water?

*July 25, 2012*

**Physics**

A U-tube contains two fluids with densities ρ1 = 1070 kg/m3 and ρ2 = 595 kg/m3 as sketched below. What is the difference d in the heights of the top surfaces of the two fluids?

*July 25, 2012*

**Microbiology**

What responsibilities do patents have for their children's health?

*July 15, 2012*

**trig**

Solve the equation on the interval [0,360) cos^2t+2cos(t)+1=0

*July 12, 2012*

**trig**

Find all solutions in the interval [0,360) sin(4t)=ã3/2

*July 12, 2012*

**Physics**

Nothing

*July 11, 2012*

**physics**

You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 273 N for 7.2 s, during which time the refrigerator moves a distance of 3.4 m at constant velocity.

*July 11, 2012*

**Physics**

A rock of mass 0.086 kg is thrown upward with an initial speed of 13 m/s. Find the work done by gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point on its trajectory. Hint: You do not have to calculate the rock's maximum ...

*July 11, 2012*

**Physics**

A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.

*July 11, 2012*

**Physics**

A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.

*July 11, 2012*

**Physics**

A block of mass is pulled along a rough horizontal surface by a rope as sketched in the figure below. The tension in the rope is 45 N, and the coefficient of kinetic friction between the block and the surface is

*July 11, 2012*

**Physics**

A crate of mass 29 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 25 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp...

*July 11, 2012*

**Physics**

A crate of mass 59 kg is pushed across a level floor by a person. If the person exerts a force of 30 N in the horizontal direction and moves the crate a distance of 12 m, what is the work done by the person?

*July 11, 2012*

**English**

i can not seem to find who the Fictional Character Justice Johnson is, i don't even see it anywhere in my book?

*July 10, 2012*

**Physics**

A sphere of mass 85 kg is attached to one end of a rope as shown in the figure below. It is found that the rope does an amount of work W = 8030 J in pulling the sphere upward through a distance 9.6 m. Find the tension in the rope.

*July 6, 2012*

**Physics**

Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s

*June 29, 2012*

**Physics**

In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is found to be 3.0 1011 m, with a period of 1000 days. Find the mass of the star.

*June 29, 2012*

**Physics**

Saturn makes one complete orbit of the Sun every 29.4 years. Calculate the radius of the orbit of Saturn. Hint: It is a very good approximation to assume this orbit is circular.

*June 29, 2012*

**Physics**

A stone of mass 0.31 kg is tied to a string of length 0.65 m and is swung in a horizontal circle with speed v. The string has a breaking-point force of 70 N. What is the largest value v can have without the string breaking?

*June 29, 2012*

**Physics**

Consider points on the Earth's surface as sketched in the figure below. Because of the Earth's rotation, these points undergo uniform circular motion. Compute the centripetal acceleration at the following points.

*June 29, 2012*

**Physics**

Suppose the circular track in the figure below has a radius of 104 m and the runner has a speed of 3.3 m/s.

*June 29, 2012*

**Physics**

Suppose the circular track in the figure below has a radius of 104 m and the runner has a speed of 3.3 m/s.

*June 29, 2012*

**Physics**

A jogger is running around a circular track of circumference 480 m. If the jogger has a speed of 11 km/h, what is the magnitude of the centripetal acceleration of the jogger?

*June 28, 2012*

**Physics**

Mars has two moons, Phobos and Deimos. It is known that the larger moon, Phobos, has an orbital radius of 9.4 106 m and a mass of 1.1 1016 kg. Find its orbital period.

*June 25, 2012*

**Physics**

Uranus makes one complete orbit of the Sun every 83.8 years. Calculate the radius of the orbit of Uranus. Hint: It is a very good approximation to assume this orbit is circular.

*June 25, 2012*

**Physics**

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 4.3 1011 m. Find the period of the orbit.

*June 25, 2012*

**Physics**

Find the gravitational force of the Sun on Jupiter.

*June 25, 2012*

**Physics**

The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only one-fifth of your weight on the ground. What is the speed of the roller coaster?

*June 25, 2012*

**Physics**

The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only one-fifth of your weight on the ground. What is the speed of the roller coaster?

*June 25, 2012*

**Physics**

What is the minimum speed the rock can have without the string becoming "slack"? (The rock is traveling in vertical circle. Assume that m = 1.6 kg and r = 0.48 m.)

*June 22, 2012*

**Physics**

Consider the motion of the rock in the figure below. What is the minimum speed the rock can have without the string becoming "slack"? (The rock is traveling in vertical circle. Assume that m = 1.6 kg and r = 0.48 m.)

*June 22, 2012*

**Physics**

A bicycle wheel of radius 0.2 m is spinning at a rate of 70 revolutions per minute.

*June 22, 2012*

**Physics**

A soccer ball is kicked with an initial speed of 27 m/s at an angle of 20° with respect to the horizontal. A) find the maximum height reached by the ball. B) find the speed of the ball when it is at the highest point on its trajectory. C) where does the ball land? That is ...

*June 20, 2012*

**Physics**

A soccer ball is kicked with an initial speed of 27 m/s at an angle of 20° with respect to the horizontal.

*June 20, 2012*

**Physics**

A quarterback is asked to throw a football to a receiver that is 32.6 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand? Ignore air resistance. Assume the ball is caught at the same height as it is thrown.

*June 20, 2012*

**Physics**

A cable attached to a block of mass 8 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 5.3 N, what is the coefficient of kinetic friction between the block and the floor?

*June 20, 2012*