# Sierra

Most popular questions and responses by Sierra-
## LA

what are two ways tock and humbug are differentin act 2 of the phantom tollbooth

*asked on May 20, 2017* -
## 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.

*asked on August 22, 2013* -
## Art

what value is most likely encouraged when citizens look at the rising eagle on the unit state dollar bill? Wisdom Patriotism Endurance Creativity I think either wisdom or patriotism

*asked on April 7, 2016* -
## Earth Space Science

the horizontal distance between a crest to the next trough of an ocean wave is 5 meters. what is the wavelength of the ocean wave? A)2 meters B)5 meters C)10 meters D)20 meters I think its 10 meters but im not so sure, I would like to make sure.

*asked on March 28, 2015* -
## trig

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

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

Radium-223 has a half-life of 11.4 days. Approximately how long would it take for the activity of a sample of 223Ra to decrease to 2.00 % of its initial value?

*asked on April 7, 2016* -
## Chemistry

aqueous sulfurous acid H2SO3 was made by dissolving 0.200 L of sulfur dioxide gas at 19 C and 745 mm Hg in water to yield 500.0 ml of solution. the acid solution required 12.9 ml of sodium hydroxide solution to reach the titration end point. what was the

*asked on February 20, 2011* -
## Chemistry

find the mass in grams of 1.40x10^23 molecules of n2

*asked on January 11, 2015* -
## social studies

where did major general William Rufus Shafter stay while he controlled the war? PLEASE HELP!!!!!!

*asked on April 7, 2014* -
## Language Arts

Choose the meaning that best matches the word in capitals: The president of the large company felt as if he had reached the PINNACLE of his career. A. lowest point B. pointed or towering formation C. highest point of achievement** D. rise toward success or

*asked on January 15, 2016* -
## 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.

*asked on March 10, 2014* -
## American Government

Which statement does NOT characterize Martin Luther King Jr.'s "I Have a Dream" speech? 1.)It openly criticized the Governor of Alabama 2.)It supported the peaceful congregation of peoples of all races and religions 3.)It pointed out racial problems in the

*asked on February 14, 2012* -
## Math

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

*asked on March 10, 2014* -
## Math

The country hall charges a rental fee of $1000 and at least $3000 for food. Olivi is planning a class reunion. If she had chosen a buffet that costs $38.56 per person what is the minimum possible number of people who must attend to support the expense?

*asked on October 29, 2016* -
## english

in line 16of "The Nymph's reply to the shepherd" in what ways does the speaker's word choice reveal a striking balance of opposite to illustrate the theme of the harmful effects of time?

*asked on September 16, 2015* -
## physics 11

brutus, a champion weightlifter, raises 240 kg a distance of 2.35 m. How much work is done by Brutus lifting the weights?

*asked on January 11, 2011* -
## physics

The 2 kg block in Figure 7-25 slides down a frictionless curved ramp, starting from rest at a height of h = 3 m. The block then slides d = 12 m on a rough horizontal surface before coming to rest. Figure 7-25 (a) What is the speed of the block at the

*asked on January 30, 2011* -
## history

which region of mexico is the best for growing crops

*asked on January 9, 2019* -
## English

Hello, can you check with me to see if this answer is correct to this question. What does scrooge mean by these lines in a Christmas carol Act two scene four? Spirit this is a fearful place, in leaving it, I shall not leave its, lesson, Trust me let us go.

*asked on March 27, 2015* -
## Physics

A person of mass 55 kg stands at the center of a rotating merry-go-round platform of radius 3.4 m and moment of inertia 670 kg·m2. The platform rotates without friction with angular velocity 1.0 rad/s. The person walks radially to the edge of the

*asked on January 23, 2011* -
## Chemsitry

Calculate the weight of KHP that will react with 25mL of .1M NaOH

*asked on October 19, 2010* -
## Chemistry

What is the percent by mass of hydrogen in aspirin C2H8O4?

*asked on January 10, 2015* -
## 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?

*asked on June 28, 2012* -
## Chemistry

What is the mass of 1.00 mol of sodium hydrogen carbonate?

*asked on January 10, 2015* -
## Science

Salinity of the ocean A)is generally very low B)changes with climate C)decreases with increase in temperature D)increases where a river meets the ocean I think its A but I'm not sure I just want to make sure.

*asked on March 27, 2015* -
## 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

*asked on November 26, 2012* -
## Math

A true crab has 4 fewer than twice the number of legs that a hermit crab has. The hermit crab has 6 legs. How many legs does the true crab have? I put for the equation 4c =6 *2 I am confused

*asked on January 14, 2015* -
## physics

A vibrator moves one end of a rope up and down to generate a wave. The tension in the rope is 58 N. The frequency is then doubled. To what value must the tension be adjusted, so the new wave has the same wavelength as the old one? would it be doubled?

*asked on January 26, 2009* -
## College Algebra

Allison drove home at 65 mph, but her brother Austin, who left at the same time, could drive at only 41 mph. When Allison arrived, Austin still had 144 miles to go. How far did Allison drive?

*asked on January 29, 2015* -
## 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?

*asked on June 25, 2012* -
## Chemistry

What volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

*asked on April 5, 2016* -
## 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?

*asked on 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?

*asked on July 31, 2012* -
## social studies

what is one important difference between the koreas and japan 1)korea has may mountains 2)japan is not crowded but korea is 3)the korean peninsula is on stable ground 4)koreas mineral resources are used and japans are not

*asked on March 16, 2012* -
## AP Physics

Find the scalar product of the vectors in Figure P7.8, where è = 117° and F = 31.0 N. y | | ___| Unk Angle----> / | -------\--------------x starts@O-----> / /| / / /_|/

*asked on November 21, 2010* -
## 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.

*asked on June 29, 2012* -
## 7th grade math

The sum of an integer and the next greater integer is at the most 13. Write an inequality to find the lesser integer and solve for the lesser integer. My answer n+n+1

*asked on February 4, 2015* -
## physics

A circular curve of highway is designed for traffic moving at 93 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 110 m, what is the correct angle of banking of the road? (b) If the curve were not banked,

*asked on October 7, 2014* -
## 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

*asked on November 26, 2012* -
## physics

The pressure under the surface of a liquid increases with depth. Determine the pressure in Newtons per square meter on a lake at a depth of 100 meters (over 300 feet).

*asked on March 8, 2012* -
## Math

Each human hand has 27 bones. There are 6 more bones in the fingers than in the wrist. There are 3 fewer bones in the palm than in the wrist. How many bones are in each part of the wrist?

*asked on April 26, 2015* -
## calculus

The operating cost, C, in dollars per hour, for an airplane cruising at a height of h metres and an air speed of 200km/h is given by: C = 4000 + h/15 + 15000000/h for the domain 1000 ≤ h ≤ 20000. Determine the height at which the operating cost is at a

*asked on March 31, 2015* -
## chemistry

Hemoglobin is the oxygen carrying molecule of red bloods and contains 4 atoms of iron per molecule of hemoglobin. A sample of hemoglobin weighing 13.4 g contains 45.6 mg iron. What is the molecular mass of hemoglobin? I'm unsure of where to begin with this

*asked on October 24, 2014* -
## 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'(6,-4), R'(-1,1)

*asked on March 26, 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?

*asked on March 11, 2014* -
## math

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

*asked on December 5, 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?

*asked on July 25, 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.)

*asked on June 22, 2012* -
## Physics

a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If specific heat of iron is 0.11 cal/G*c to what final temperature will the iron bar cool?

*asked on January 11, 2009* -
## Trigonometry

Need help solving problems using the Trigonometric Identities: 8cos^4 thet=cos4theta+4cos2theta+3 I am a bit unsure how to solve it. I am aware that the first step I must take is to simplify the problem and then use the Product to Sum formula Nasty one!

*asked on April 23, 2007* -
## Chemistry

what volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

*asked on April 6, 2016* -
## Physics

you strike a huge spring at a speed of 30m/s while strapped in a steel cage. When you hit the spring with combined mass of 320kg it is compressed 9.0m. A) What is the spring constant of the spring? B) How long are you in contact with the spring before it

*asked on February 22, 2016* -
## chemistry

Experimentally the ionization energy of hydrogen is 1312.2 kJ / mol. What would be the wavelength (nm) of a photon with enough energy to ionize one atom of hydrogen? They give the equation E=hcR but those are all known constant values and none include mols

*asked on November 18, 2014* -
## Math

Write a rule in function notation to describe transformation that is a reflection across the x-axis. A. Ry-x(X,Y) B. Rx-0(X,Y) C. Rx-y(X,Y) D. Ry-0(X,Y)

*asked on March 27, 2014* -
## 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.

*asked on July 31, 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

*asked on July 11, 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.

*asked on June 25, 2012* -
## Civics

Which statement about the relationship between the president and the Cabinet is false? =Because the president is so busy, members of the Cabinet often have a good deal of leeway in the running of their departments. Not all executive departments are subject

*asked on February 15, 2012* -
## Physics

a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If specific heat of iron is 0.11 cal/G*c to what final temperature will the iron bar cool?

*asked on January 11, 2009* -
## algebra 2

Let f(x)=5x^3-2x and g(x)=3x^3.Preform the operation given and state the domain. A. F(x)+ g(x) B. F(x) - g(x) C. F(x) • g(x) D. F(x) / g(x) E. f(g(x)) F. g (f(x)

*asked on November 7, 2016* -
## physics

A horizontal force of 150 N is used to push a 45.0-kg packing crate a distance of 5.75 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic

*asked on February 17, 2015* -
## Chem

41. How much heat energy must you use to raise the temperature of 100 grams of water from 60C to 70C. Show your calculations. 42. You have a pot of 100C liquid water. If you add heat to the water, will the temperature start to raise at once? why or why

*asked on September 15, 2014* -
## 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

*asked on January 18, 2013* -
## 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

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

A basketball player makes a jump shot. The 0.700-kg ball is released at a height of 2.00 m above the floor with a speed of 7.70 m/s. The ball goes through the net 3.00 m above the floor at a speed of 3.10 m/s. What is the work done on the ball by air

*asked on November 21, 2010* -
## 6 grade algebra

cindy earns 6% simple interest each year on her savings account. if she has $850 in her account and leaves the money in there for 5 years. how much interest will the money earn? what is the new balance in cind's account?

*asked on November 12, 2010* -
## Chemistry: Please Help!!

39. Explain why sweating cools you down in terms of molecular kinetic energy. 40. You take a pizza out of the oven and let it cool briefly. When you bite into it, the crust is not too hot but the cheese burns your mouth. Explain why this happens in terms

*asked on September 15, 2014* -
## 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

*asked on December 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.

*asked on July 6, 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?

*asked on June 25, 2012* -
## Organic Chemistry

A student wanted to synthesize the anesthetic 2-ethoxy-2-methylpropane. She used ethoxide ion and 2-chloro-2-methylpropane for the synthesis and ended up with little of the desired product. Why? What major product did she obtain? What reagents should she

*asked on November 21, 2010* -
## 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

*asked on July 25, 2012* -
## trig

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

*asked on July 12, 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.

*asked on 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

*asked on July 11, 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.

*asked on June 25, 2012* -
## AP Physics

there are two vectors in quadrant three one with a magnitude of 31.0N and has a direction of 117degrees in the negative direction from the x axis the other has an unknown magnitude and unkown theta in the positive direction starting from 90 degrees Find

*asked on November 21, 2010* -
## Math

How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate??

*asked on November 19, 2009* -
## math

x-8y=18 -16x+16y=-8

*asked on March 6, 2009* -
## science

convert your answer from 3 to meters per second.

*asked on February 11, 2016* -
## 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?

*asked on July 11, 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

*asked on June 20, 2012* -
## Physics

A squirrel is resting in a tall tree when it slips from a branch that is 43 m above the ground. It is a very agile squirrel and manages to land safely on another branch after only 0.47 s. What is the height of the branch it lands on?

*asked on June 20, 2012* -
## Civics

Article II of the United States Constitution established the _____. presidency only presidency and the vice presidency the vice presidency only =the Senate and the House

*asked on February 14, 2012* -
## Math

1400= 2/5x X= 7000 I took 1400 times 5

*asked on January 13, 2015* -
## 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

*asked on January 17, 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.....

*asked on January 7, 2013* -
## math

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

*asked on August 22, 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

*asked on July 31, 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?

*asked on 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.

*asked on 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.

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

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

*asked on June 22, 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.

*asked on June 20, 2012* -
## algebra

can you simplify Simplify 5m - 13n - n + 4m

*asked on February 16, 2012* -
## Civics

Which of the following was NOT a reason why a stronger central government was needed? To solve the economic problems of the United States =To limit individual liberties To deal with military matters both internal and external To make the States work

*asked on February 14, 2012* -
## statistics

Determine the sample size needed in order to be 95 percent confident the p, the sample proportion of HD television sets that last at least five years without a single repair, is within 0.03 of , the true proportion of sets that last at least five years

*asked on November 28, 2011* -
## Chemistry

What is the pH of a solution that is comprised of 0.0843 M HCl and 0.0287 M HClO4?

*asked on March 7, 2011* -
## physics

A damped mass-spring system oscillates at 190 Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 6.5 cm and the energy of the oscillating system is then 65 J. (a) What is the amplitude of oscillation at t = 2.0 s? What

*asked on January 31, 2011* -
## physics 11

if you have the formula W=Fd, where W=work, F=force, and d=displacement, how do you find W if you don't have F, but you have a mass and displacement?

*asked on January 11, 2011*