Thursday
October 23, 2014

Posts by Sierra


Total # Posts: 209

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

Physics
Two children are playing on a 154-m-tall bridge. One child drops a rock (initial velocity zero) at t = 0. The other waits 1.1 s and then throws a rock downward with an initial speed v0. If the two rocks hit the ground at the same time, what is v0
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?
June 20, 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
March 16, 2012

physics
A cube of lead measuring 1 meter on each side is thrown into the ocean. Determine the buoyant force acting on this mass of lead. The density of lead is 11.4 grams/ cubic centimeter
March 8, 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).
March 8, 2012

algebra
can you simplify Simplify 5m - 13n - n + 4m
February 16, 2012

Civics
i have no book!
February 15, 2012

Civics
Well is it number 3?
February 15, 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 to presidential ...
February 15, 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
February 14, 2012

Civics
Since the 1970s, the Supreme Court has interpreted the Equal Protection Clause as prohibiting the government from making "_____" distinctions between people. unreasonable =racial reasonable unnecessary
February 14, 2012

American Government
There is stuff about alabama. "I have a dream that one day, down in Alabama, with its vicious racists, with its governor having his lips dripping with the words of interposition and nullification; one day right there in Alabama, little black boys and black girls will be ...
February 14, 2012

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 South ...
February 14, 2012

Civics
Which is NOT true of the segregation laws passed after the Civil War? =They prohibited interracial marriage. They did not only apply to blacks. They were only in the South. All of these statements are true.
February 14, 2012

Civics
The Constitution gives sovereignty only to the _____.? A.State legislatures B.national government C.president of the United States D.State constitutions ....i need help, none of them are right?
February 14, 2012

civics
_____ States supported the _____ Plan, which called for a bicameral legislature in which States would be represented according to their population. Slave, Three-Fifths =Larger, Virginia Northern, Connecticut Smaller, New Jersey
February 14, 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 together as a single ...
February 14, 2012

science
What materials can I use to make an imprint like a fossil?
January 23, 2012

Science
Suppose you find a fossil imprint of an animal that existed many years ago.How can I make a model to compare that imprint to the foot of an animal living today?
January 23, 2012

Civics
Then is it number 3?
January 20, 2012

Civics
Which is NOT a responsibility of the Department of Agriculture? 1. The opening of foreign markets to U.S. agricultural products =2. To oversee federal anti-hunger programs 3. The designation of lands for private and public use 4. Support for farmers with agricultural research
January 20, 2012

art
what is the definition of pattern, in elements of design
December 11, 2011

spanish
how do you say, "what subjects are at your school.?"
December 1, 2011

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 without a single...
November 28, 2011

sciene
how do u research speeches on the internet {worldbiomes}.
November 8, 2011

Math
idk
October 21, 2011

Algebra
In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be x + 3 = 48 => x = 45 or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please help Eric to ...
October 13, 2011

Science
A football player has to push a blocking sled the length of a football field. What are two ways the workload for the football player could be increased?
October 11, 2011

Physics 6A
shortcut: \hat
September 21, 2011

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.
September 20, 2011

math
I can't figure this out this problem.. estimate 20% of 131 by using 10%
May 30, 2011

Calculus 12 Optimization
120
May 19, 2011

calculus
Find f^-1(13), f(x)= 2x^5 + 3x^3 + 8x and find D(f^-1(x)) at x=13. Is this correct... I got 1/27 ??
March 22, 2011

Chemistry
What is the pH of a solution that is comprised of 0.0843 M HCl and 0.0287 M HClO4?
March 7, 2011

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 molarity of the sodium...
February 20, 2011

Chemistry
What is the volume of Tin(Sn)? Mass of sample = 2.588g Initial vol. of water = 31 m/L Final vol. of water = 32 m/L
February 10, 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 is the amplitude at t...
January 31, 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 bottom of the ramp? (b) ...
January 30, 2011

Math
Determine whether the function is periodic. State the period, the domain and the range of g(x)= 2 cos 2x+3 sin 5x
January 26, 2011

math
a boring job
January 24, 2011

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 platform. (a) Calculate...
January 23, 2011

Physics
If I have an originaloscilation frequency of .64 and amplitued of 15 What would doubling the mass of the object do to the freqency and amplitude?
January 22, 2011

Math
If you are given a problem that has measurements in yards and asks you to find surface area, what would the units be in your answer?
January 19, 2011

social studies
6. Stabilization policies can best be described as policies that: A. attempt to eliminate recession and/or inflation in the economy. B. use changes in government spending to promote an equitable income distribution. C. use changes in the money supply to lower income tax ...
January 17, 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?
January 11, 2011

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?
January 11, 2011

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 have used?
November 21, 2010

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 the scalar product of ...
November 21, 2010

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
November 21, 2010

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-----> / /| / / /_|/<-----117 degrees / / | / / <-----31.0N
November 21, 2010

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 resistance, a ...
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?
November 12, 2010

Chemsitry
Calculate the weight of KHP that will react with 25mL of .1M NaOH
October 19, 2010

math
x/5-1=3
September 22, 2010

Chemistry
(1.48 cg) + (0.347 g) . Answer in units of g
April 1, 2010

college
Solve the inequality using a sign graph (test point method) x^3-x^2-4x+4<0
March 17, 2010

diagramming a sentence
In this sentence, "Yellowstone National Park is in Wyoming", is the word "in" the present tense verb?
January 14, 2010

science
if we didnt have chemical energy what would change in our everyday life?
January 14, 2010

Math
what is 12 to the 2nd power?
December 6, 2009

Math
How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate??
November 19, 2009

math
find the missing numbers 1562 ----- ----- ---- ------ ----- 1874. they are number lines
September 28, 2009

math
find the numbers 2493 ----- ------ ----- ----- 8008
September 28, 2009

Chemistry II
109.4
September 16, 2009

math
what is the difference between doubles plus one and counting on?
August 27, 2009

algebra 1
how do i solve polynominal expressions
June 10, 2009

trig--power reducing formulas
(cosx)+(cosx)(cosx)
April 20, 2009

Social Studies
Information about Ponhatons
April 1, 2009

Bible study
Hi, im doing a bible study and it tells mr to unscramble some names. Here are the questions... Towhat for men was Jesus taken to after he was arrested? It was _ _ _ _ _ (NNASA), the father in law of the second man. The second man is _ _ _ _ _ _ _ _ (AIPACHAS), Jesus spent the ...
March 15, 2009

math
x-8y=18 -16x+16y=-8
March 6, 2009

Civics
Who is assigned to take care of diplomacy?
February 21, 2009

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?
January 26, 2009

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?
January 11, 2009

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?
January 11, 2009

SKILLS FOR THE EFFECTIVE TEACHER AIDE
ok for one they do send you your books. because i am doing the same exact thing right now!!
January 9, 2009

5th grade math
Need help... equivalent decimal for 214% =.214right? percentage 7 1/2% of 120 = 9% percent 15 is what percent of 75 = ?
December 5, 2008

algebra
Ok this is just dumb no answers any where
October 26, 2008

english
What dose 1/2 a page mean? Dose it mean 15 lines?
September 8, 2008

Math
What are dot arrays? What would a dot array for $1.84 look like? Thanks!
August 26, 2008

Math
Using a graph, what is the relationship between volume and height?
May 29, 2008

Science
The question I have is based on air having a density of 0.0013(g/mL). What is the mass of 550mL of air? How do I use the formula Density = mass/volume to solve this problem?
March 22, 2008

social studdies
Hii social studdies is kind of hard!And yes i do do 8th grade social stuudes
January 29, 2008

Math
i have a homework problem:
November 15, 2007

math
need to know metric system in alphabetical order
September 11, 2007

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! let's start on the ...
April 23, 2007

New York
For a report I have to choose a state and a town and write about it I chose Franklinevill NY. Please help me find some websites or maybe find a better state and town to do my report on. Thank you I googled Franklinville NY and found this home page for the town. Click the links...
April 1, 2007

math
why dosnt the commutitive property work with subtraction and division? For subtraction : Because a - b and b - a are not the same. They are of opposite sign. For division: a/b does not equal b/a. If it did, you would have a^2 = b^2 for ANY a and b, which is impossible
March 5, 2007

spelling
grass:lawn::toss:throw
January 16, 2007

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