# Posts by sierra

Total # Posts: 305

**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?

**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.)

**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.)

**Physics**

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

**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 ...

**Physics**

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

**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.

**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?

**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

**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?

**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

**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

**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).

**algebra**

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

**Civics**

i have no book!

**Civics**

Well is it number 3?

**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 ...

**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

**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

**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 ...

**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 ...

**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.

**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?

**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

**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 ...

**science**

What materials can I use to make an imprint like a fossil?

**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?

**Civics**

Then is it number 3?

**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

**art**

what is the definition of pattern, in elements of design

**spanish**

how do you say, "what subjects are at your school.?"

**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...

**sciene**

how do u research speeches on the internet {worldbiomes}.

**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 ...

**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?

**!!MATH!!**

I believe it is 15•12 because there are 15 red and for ever red there is 12 so just do 15•12 and that =180 hope it helped :3

**Physics 6A**

shortcut: \hat

**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.

**math**

I can't figure this out this problem.. estimate 20% of 131 by using 10%

**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 ??

**Chemistry**

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

**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...

**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

**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...

**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) ...

**Math**

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

**math**

a boring job

**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...

**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?

**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?

**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 ...

**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?

**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?

**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?

**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 ...

**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

**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

**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 ...

**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?

**Chemsitry**

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

**math**

x/5-1=3

**Chemistry**

(1.48 cg) + (0.347 g) . Answer in units of g

**college**

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

**diagramming a sentence**

In this sentence, "Yellowstone National Park is in Wyoming", is the word "in" the present tense verb?

**science**

if we didn't have chemical energy what would change in our everyday life?

**Math**

what is 12 to the 2nd power?

**Math**

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

**math**

find the missing numbers 1562 ----- ----- ---- ------ ----- 1874. they are number lines

**math**

find the numbers 2493 ----- ------ ----- ----- 8008

**Chemistry II**

109.4

**math**

what is the difference between doubles plus one and counting on?

**algebra 1**

how do i solve polynominal expressions

**trig--power reducing formulas**

(cosx)+(cosx)(cosx)

**Social Studies**

Information about Ponhatons

**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 ...

**math**

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

**Civics**

Who is assigned to take care of diplomacy?

**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?

**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?

**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?

**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!!

**5th grade math**

Need help... equivalent decimal for 214% =.214right? percentage 7 1/2% of 120 = 9% percent 15 is what percent of 75 = ?

**algebra**

Ok this is just dumb no answers any where

**math**

OPENED TOAD

**english**

What dose 1/2 a page mean? Dose it mean 15 lines?

**Math**

What are dot arrays? What would a dot array for $1.84 look like? Thanks!

**Math**

Using a graph, what is the relationship between volume and height?

**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?

**social studdies**

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

**Math**

i have a homework problem:

**math**

need to know metric system in alphabetical order

**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 ...

**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...

**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

**spelling**

grass:lawn::toss:throw

**Curriculum Development**

I have a couple of questions on an assignment, that I need help with. 1. Rebecca is painting on an easel. She paints a blue sun with green clouds all around it. She is able to express what kind of creative potential? 1.maximum 2.moderate 3.minimum 4.no 2. Steven is making ...

**Curriculum Development**

I have a question that I need help in answering. Miss Sanchez lives in Washington,D.C. She was planning fied trips for her pre-school class. Which one of the following field trips would NOT be an appropriate choice for her students? A. Going to the National Mall to see the ...

**Cirriculum Development**

When Amy's grandmother did die it would be appropriate for her mother to: A. say,"Grandma was very sick but now she's gone. We aren't going to cry about it anymore." B. say,"I know you are sad. So am I. We will miss Grandma,but I am glad she isn'...

**Curriculum Development Question**

I have this question on a homework assignment. Which of the following menus is best for preschoolers as outlined by the Food Guide Pyramid for children. 1.Breakfast-fruit juice,a bowl of cereal,and a piece of toast Morning snack-fruit juice and crackers Lunch-fruit juice,a ...