Tuesday

September 1, 2015
**Physics (Electric fields and Coulomb's Law)**

I need help with this question please. An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized, and has a charge of +e. If the field meter reads 0.000000202 N/C, how far away is it from the ion? _________ m Thank you
*Sunday, April 21, 2013 by Kathy*

**Electric fields and Coulomb's law**

Please, I need help with this question. An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized, and has a charge of +e. If the field meter reads 0.000000202 N/C, how far away is it from the ion? Answer:__________ m Thank you.
*Sunday, April 21, 2013 by Kathy*

**calculus**

6. The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3, where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) ...
*Saturday, April 20, 2013 by I JUST NEED TO KNOW D*

**calculus (gr 12)**

The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3, where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) How ...
*Friday, April 19, 2013 by PLEASE HELP ME!*

**Grade 12 Calculus **

The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3, where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) How ...
*Thursday, April 18, 2013 by HELP MEE PLEASE*

**simple PHYSICS**

The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds?
*Thursday, April 18, 2013 by HELP ME...uRGENT!*

**calculus (gr 12)**

The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3, where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) How ...
*Wednesday, April 17, 2013 by HELP MEE PLEASE*

**English**

6.Isn't it a little (far-fetched selfseeking) to suggest that the pollution of our environment is mainly caused by creatures from outer space? far fetched 7.Unless the poor people of the country see some hope of improving their lives there will probably soon be a great ...
*Wednesday, April 17, 2013 by Jerald*

**science**

light trsavels at 3*10 m/s. an astrounaut shines a flash light in space. 4 hours later a martian sees a light from the astrounaut. how far away is mars from the astrounaut?
*Wednesday, April 17, 2013 by allison*

** Probability**

If I have a bag filed with 6 marbles, 2 blue marbles, and 4 yellow marbles, and I had to pick one from the bag, what is my sample space?
*Tuesday, April 16, 2013 by Sabrina*

** Probability**

If I have a bag filed with 6 marbles, 2 blue marbles, and 4 yellow marbles, and I had to pick one from the bag, what is my sample space?
*Tuesday, April 16, 2013 by Sabrina*

** Probability**

If I have a bag filed with 6 marbles, 2 blue marbles, and 4 yellow marbles, and I had to pick one from the bag, what is my sample space?
*Tuesday, April 16, 2013 by Sabrina*

**Physics**

In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
*Tuesday, April 16, 2013 by Anonymous*

**physics**

Suppose you are in space can you decide whether you are in rest or motion
*Tuesday, April 16, 2013 by dhanya*

**calculus (gr 12)**

The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3, where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) How ...
*Tuesday, April 16, 2013 by Alexandra*

**physics**

The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds?
*Tuesday, April 16, 2013 by Orbital speed*

**Physics :(( help please TT**

The space shuttle had a top orbital speed of 8000 m/s and orbited in a circular orbit approximately 320 km above the earth's surface. How long was one orbit in seconds? Details and assumptions The radius of the earth is 6370 km.
*Tuesday, April 16, 2013 by OIan*

**Grade 12 Calculus **

6. The forward motion of a space shuttle, t seconds after touchdown, is described by s(t) = 189t − t^3, where " is measured in metres. a) What is the velocity of the shuttle at touchdown? b) How much time is required for the shuttle to stop completely? c) ...
*Monday, April 15, 2013 by Fadak*

**Physics**

An electric space heater draws 15.5 A from a 120 V source. It is operated, on the average, for 4.0 h each day. (b) How much energy in kWh does in consume in 30 days? (c) At 11 per kWh, how much does it cost to operate the heater for 30 days?
*Monday, April 15, 2013 by Billy*

**Physics**

11-098-satellite_and_junk.jpg A spherical satellite of radius 4.6 m and mass M = 195 kg is originally moving with velocity vsatellite,i = < 3000, 0, 0 > m/s, and is originally rotating with an angular speed ?1 = 2 radians/second, in the direction shown in the diagram. A ...
*Sunday, April 14, 2013 by Emily*

**stats**

Cushman and Wakefield accounting that the average annual rent for office space in Tampa was $17.63 per square foot. A real estate agent selected a random sample of 15 rental properties (offices) and found that mean rent was $18.72 per square foot and s= $3.64. At a= 0.05, test...
*Saturday, April 13, 2013 by chris*

**computer science**

I need help one how create a spreadsheet that will give an accurate launch profile for a vertical liftoff for the SpaceX Falcon 9 rocket. the information they give me is: •Start with a rocket with a mass, M1, moving with a speed, v1 •The rocket expels some small mass...
*Saturday, April 13, 2013 by Greg*

**Science URGENT~**

1. Your ____ is your first line of defense against pathogens. (1 point) brain heart large intestine skin 2. Blood vessels help regulate your body's temperature. When it's cold, your blood vessels ____ to decrease blood flow and retain heat. (1 point) boil constrict ...
*Thursday, April 11, 2013 by Gabby*

**Child day care management**

1. At what age does exercise begin to result in strength in boys and girls? A. Between ages one and two B. Between ages three and four C. Between ages five and six D. Between ages six and seven 2. Athlete’s foot is an infection caused by A. dirt. C. allergic reaction. B...
*Wednesday, April 10, 2013 by Mwila*

**LIVING A HEALTHY LIFE**

1. At what age does exercise begin to result in strength in boys and girls? A. Between ages one and two B. Between ages three and four C. Between ages five and six D. Between ages six and seven 2. Athlete’s foot is an infection caused by A. dirt. C. allergic reaction. B. ...
*Wednesday, April 10, 2013 by Mwila*

**Chemistry**

The experimentally measured and generally accepted value for the molar volume of Na is about 23 cm3/mol. Which of the following best explains why the value calculated in Part B is significantly smaller than the measured values? Part B Answer 16.3 cm3/mol Which one would it be...
*Monday, April 8, 2013 by Morgan*

**Math**

A farmer is planting squash plants that need 2 3/8 feet to spread out. He has an area along a fence that is 20 feet long. Round the amount of space the squash plants need to the nearest 1/2 foot. How many squash plants can the farmer grow along the fence?
*Monday, April 8, 2013 by Laura*

**math**

an oak tree grows 500 meters north of the bottom of a rectangular park. The oak tree takes up a space of a circular area with a radius of 2.5 meters .The center of the tree is 24 meters from the left side of the park .The park is 200 meters wide and has a length of 1300 meters...
*Monday, April 8, 2013 by aspasia*

**Physics**

In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the magnitude of the earth...
*Monday, April 8, 2013 by Don*

**FRENCHHHH**

conjugue les verbes a limparfait ou au passé compose guillame,quatorze ans,se rapelle son long sejour a l'hopital, quand il receivait la visite des animatuers de docteur clown,La premiere fois, j'ai cru(croire) qu'ils ______ (venir) d'une autre planete! ...
*Monday, April 8, 2013 by Mia*

**physics**

A L=3 mile long conducting cable tethers a satellite to the International Space Station. The Cable moves through the Earth' magnetic field of about B=0.02 Gauss at a speed of v=8 km/sec. The cable points radially from the Space Station to the satellite. The ISS moves ...
*Sunday, April 7, 2013 by abdul rahman *

**WRITING**

I need help revising for pronouns towards this paragraph: Choosing a roommate is more difficult than they might think. People have different attitudes about sharing a living space. These attitudes are often based on our notions of cleanliness, ownership, and personal space. ...
*Saturday, April 6, 2013 by CHRISTINA OTORINO*

**epidemiology **

In a study examining associations between level of education and response to the Philadelphia Public Health Department’s emergency messages to “shelter in place” (meaning stay in your home) following an accidental release of chemicals from the Sunoco refinery in...
*Friday, April 5, 2013 by sara*

**UNDERSTANDING OBSERVATION AND BEHAVIOR**

The Child Development Checklist is an observation tool that A. includes space to record non-objective data. B. omits references to children's emotions. C. focuses on sequences of child development. D. can only be used by one observer for the same child.
*Friday, April 5, 2013 by Anonymous*

**math**

A baseball diamond has 90 ft. between each base. A softball diamond has 60 ft between each base. How many yards longer is the space between bases on a baseball diamond than a softball diamond?
*Thursday, April 4, 2013 by Kelsey*

**algebra**

For problems 13 and 14, assign each letter and a blank space to a number as shown by the alphabet table below. Use the code [1,-2_-3,7] encode the phrase "ONE QUESTION TO GO" The matrix C=[1,-2_-3,7] was used to encode a phrase to [7,-28,-25,-35,-2_-21,107,90,123,17...
*Thursday, April 4, 2013 by lee*

**mechanics**

A space aircraft is launched staight up.The aircraft motor provide aconstant acceleration for 10 second ,then it stops.the aircraft's altitude 15 second after launch is 2 km.ignore air friction.what is the acceleration and the maximum speed reached in km/h?
*Thursday, April 4, 2013 by shone*

**Science**

Define mass How much something weighs Define volume The amount of space in something Define density and show the formula for calculating density The amount of mass or matter in an object D=M/V
*Wednesday, April 3, 2013 by Jerald*

**trig**

Indoor steps generally are steeper and have smaller landings. A staircase has a 9 inch vertical rise per step to get to the second floor of a house. If the angle of elevation is 36.8 degrees and there are 16 feet of horizontal space total for each of the landings combined, ...
*Wednesday, April 3, 2013 by Leia*

**Algebra 1B**

A painter can use the formula A=2/3bh to estimate the Area of space under the parabola, where b is the length of the base and h is the height from the base to the vertex. Calculate the area, in square feet under each arch.
*Tuesday, April 2, 2013 by Frank J*

**physics**

A rocket ship at rest in space gives a short blast of its engine, firing 26 kg of exhaust gas out the back end with an average velocity of 182 m/s. What is the change in momentum of the rocket during this blast?
*Tuesday, April 2, 2013 by Marty*

**algebra**

For problems 13 and 14, assign each letter and a blank space to a number as shown by the alphabet table below. Use the code [1,-2_-3,7] encode the phrase "ONE QUESTION TO GO" The matrix C=[1,-2_-3,7] was used to encode a phrase to [7,-28,-25,-35,-2_-21,107,90,123,17...
*Tuesday, April 2, 2013 by lee*

**physics**

A space aircraft is launched straight up. The aircraft motor provides a constant acceleration for 10seconds, then the motor stops. The aircraft's altitude 15seconds after launch is 2km. Ignore air friction. Determine (i) the acceleration, (ii)the maximum speed reached in ...
*Tuesday, April 2, 2013 by Kemmone*

**machanics**

A space aircraft is launched straight up.The aircraft motor provides a constant acceleration for 10 seconds,then the motor stops.The aircraft's altitude 15 seconds after launch is 2 km.ignore air friction .what is the acceleration,maximum speed reached in km/h and the ...
*Tuesday, April 2, 2013 by shone*

**physics**

A test charge of +3.00 10-6 C experiences a downward electrostatic force of 15 N when placed at a certain point in space. What are the magnitude and direction of the electric field at this point?
*Monday, April 1, 2013 by Amy*

**algebra**

y= -x^2-12x+28 A painter can use the formula A=2/3bh to estimate the area of space under the parabola. Calculate area in square ft under each arch ~ if there are 8 arches to be painted how many square ft must be painted ~ if 1 gallon paints 200 square ft , how many gallons ...
*Sunday, March 31, 2013 by nancy*

**Math**

How many cartons measuring 3 feet by 2 feet by 6 inches can be stored in a space that is 15 feet by 9 feet by 24 feet. Assume no space is wasted. Explain your answer.
*Friday, March 29, 2013 by Amy*

**Physics**

Two astronauts, each having a mass of 61.9 kg, are connected by a 14.7 m rope of negligible mass. They are isolated in space, orbiting their center of mass at speeds of 5.57 m/s. Calculate the magnitude of the initial angular momentum of the system by treating the astronauts ...
*Wednesday, March 27, 2013 by Celeste*

**Physics**

At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety device to stop the train so that it will not plow through the station if the engineer misjudges the stopping distance. While waiting, you wonder what ...
*Tuesday, March 26, 2013 by Brandon*

**Physics**

At the State Fair you see people trying to win a prize at a game booth. They are sliding a metal disk shaped like a puck up a wooden ramp so that it stops in a marked zone near the top of the ramp before sliding back down. You estimate that you can slide the 'puck' at ...
*Tuesday, March 26, 2013 by Brandon*

**Physics**

Your artist friend's new work is a simple, high-impact kinetic sculpture called 'Destruction.' A 200-kg steel block is hung from the ceiling by an 8-foot-long rope. A second rope is attached to the side of the block. The other end of this second rope is attached to...
*Tuesday, March 26, 2013 by Brandon*

**physics**

As part of a fundraiser, you want the new dean to bungee jump from a crane. The jump will be made from 44 m above a 2.5 m deep pool of Jello. A 30 m long bungee cord would be attached to the dean's ankle. You must convince the dean that your plan is safe for a person of ...
*Tuesday, March 26, 2013 by Brandon*

**Science help**

Which of the following technologies is a result of space research and development? A.improved pacemakers B. equipment to allow police to change traffic signals C. cochlear implants to help deaf people hear D. all of the above
*Monday, March 25, 2013 by charloette*

**Chemistry**

Your space ship has docked at a space station above Mars. The temperature inside the space station is a carefully controlled 24oC at a pressure of 689 mm Hg. A balloon with a volume of 426 ml drifts into the airlock where the temperature is -88oC and the pressure is 0.160 atm...
*Monday, March 25, 2013 by Linzy*

**english**

Choose an essay or a short story to read. Then answer the following questions in the space provided. 10.What is the title of the story essay? 11.Who wrote it? 12.Whom is the story about? (Identify the main characters [or, if an essay, the subject discussed].) 13.hat happens in...
*Monday, March 25, 2013 by Carlos*

**science**

What will eventually occur if in deep space an astronaut's wrench is outside the spacecraft moving with the same velocity as the spacecraft?
*Sunday, March 24, 2013 by anonymous*

**Earth and Space Science**

which is closer to earth a moon or galaxy?
*Saturday, March 23, 2013 by Stephanie*

**Earth and Space Science**

Put the following astronomical bodies in order from largest to smallest: a. Universe b. Galaxy c. Moon d. Planet e. Solar System f. Comet
*Saturday, March 23, 2013 by Stephanie*

**meaning**

Jacy taught dancing and demonstarted ballet postions. What does position refer to in that sentence? A] dances for ballet B] the space occupied by something C] particular stances in ballet I think it's D?
*Thursday, March 21, 2013 by Celest*

**Math**

Find the sample space. a Bag contains 4 marbles: one each of red, blue, green and violet. Two marbles are drawn from the bag. assume that the first marble is not put in the bag before drawing the second marblle
*Thursday, March 21, 2013 by Nangoyi*

**Physics**

Three Point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. As the drawing shows(a) The charge at any one corner experiences forces from the charges at the other corners. Do the individual ...
*Tuesday, March 19, 2013 by Jayflord*

**Physics**

A test charge of +3.00 10-6 C experiences a downward electrostatic force of 11 N when placed at a certain point in space. What are the magnitude and direction of the electric field at this point?
*Monday, March 18, 2013 by Melissa*

**Math**

Given that a sample space is discrete if it contains either a finite number of points or a countably infinite nunber of points and a sample space is continuous if it contains uncountable number of points 1) if two distinct points on a circle radius 'r' are chosen at ...
*Sunday, March 17, 2013 by Fibin*

**Astronomy**

Mergers of two supermassive black holes will be major sources for observations of gravitational waves in the future. What do gravitational detectors aim to detect? -Tiny shifts of fixed objects due to the rippling of space. -Sound waves carried by cosmic ray particles. -Tiny ...
*Saturday, March 16, 2013 by qwerty*

**Physics 1**

An astronaut in her space suit has a total mass of m1 = 76.9 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her oxygen tank of mass m2 = 12....
*Thursday, March 14, 2013 by Emily*

**early childhood**

which of the following is best suited to a formative assessment of progress 1. muscular strength snd endurance 2. body fat analysis 3. flexibility 4. qwareness of self and space
*Wednesday, March 13, 2013 by mary*

**maths (statistics)**

A coin is constructd such dt tail cn appear 4 time as likely as d head appear. Dis coin is tossd wit a fair die. Define X= no of head on coin + no of head on die. 1. Wryt out d sample space 2. Whts d prob. Of X is 14. 3. Pr(X<=10) 4. Pr(X>=14)
*Wednesday, March 13, 2013 by Habib*

**English II**

The following paragraph is quite sketchy. Provide additional support for the topic sentence, and revise the whole paragraph so that you can answer yes to each of the questions in Lesson 6. Type the paragraph in the space below. Newspapers are great. Many people think ...
*Wednesday, March 13, 2013 by Carlos*

**English II**

In the space provided, write a paragraph of cause and effect. You may use one of the topics below or one of your own choosing. Mention at least three causes and their three effects. -friendship as a two-way street -television and preschoolers -vitamin deficiency in teenagers -...
*Wednesday, March 13, 2013 by Carlos*

**English II**

Revise the following paragraph until you can answer yes to each of the questions listed below. After you are finished, copy the revised paragraph in the space provided. 1. Does the paragraph have a clear purpose, and does each sentence contribute to that purpose? 2. Is every ...
*Wednesday, March 13, 2013 by Carlos*

**Physics**

A certain coaxial cable consists of a copper wire, radius a , surrounded by a concentric copper tube of inner radius c . The space between is partially filled (from b out to c ) with material of dielectric constant K. The goal of this problem is to find the capacitance per ...
*Wednesday, March 13, 2013 by P*

**Math**

Ms Washington buy a refrigerator that is 6 feet high, 3feet deep and 4 feet wide ,how many floor space does she need to fit the refrigerator
*Tuesday, March 12, 2013 by Zack*

**English**

The space shuttle was both a marvel and huge. Parallel Sentencce?....
*Tuesday, March 12, 2013 by Tatiana*

**Statistics**

*Give all probabilities to two decimal places. Three daily newspapers are published in a large city. Suppose we have the following facts about the people in the city: 60% read Newspaper A. 34% read Newspaper C. 72% read Newspaper A or Newspaper B. 18% read Newspaper A and B. ...
*Tuesday, March 12, 2013 by Randy*

**Statistics**

A box contains five numbered balls (1,2,2,3 and 4). We will randomly select two balls from the box (without replacement). (a) The outcome of interest is the number on each of the two balls we select. List the complete sample space of outcomes. (b) What is the probability of ...
*Tuesday, March 12, 2013 by Randy*

**Quantum M.**

Why "In Hilbert Space noone can hear you scream"?
*Sunday, March 10, 2013 by Jess*

**physics**

An electromagnetic wave has an electric field strength of 145 V/m at a point P in space at time t. (a) What is the electric field energy density at P? (b) A parallel-plate capacitor whose plates have area 0.110 m2 has a uniform electric field between its plates with the same ...
*Friday, March 8, 2013 by Beth*

**Algebra**

Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
*Thursday, March 7, 2013 by John*

**Algebra**

Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
*Thursday, March 7, 2013 by John*

**Algebra**

Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
*Thursday, March 7, 2013 by John*

**Physics-VASTS**

The Mass Budget: Mars Reconnaissance Orbiter Repair Mission Operational Concept Math Problem: The Mars Reconnaissance Orbiter (MRO) has encountered a failure in its High Resolution Imaging Science Experiment (HiRISE) camera. Mission Case: As the HiRISE camera contains the ...
*Thursday, March 7, 2013 by red*

**Economics**

I have to do a housing project for economincs class. I have to pick a house. It has to include what kind of house it is and the square footage of the house and the square feet of the living space. Where would I search for this information
*Wednesday, March 6, 2013 by Gabby*

**physics **

The speed of all electromagnetic waves in empty space is 3.00 × 108 m/s. What is the wavelength of visible light emitted at 7.2 × 108 MHz? Answer in units of m
*Tuesday, March 5, 2013 by megan*

**Physics**

Point charges Q1 ,Q2 , and Q3 reside on three corners of a square with sides of 1m ; the distance from Q2 to P3 is 2m (see diagram). (a) What is the electric potential,V , at P1 ? (Normalize the potential to be zero at infinity and give your answers in Volts). incorrect What ...
*Tuesday, March 5, 2013 by P*

**math**

Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
*Tuesday, March 5, 2013 by nice*

**logic**

Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
*Tuesday, March 5, 2013 by Anonymous*

**Physics**

Assume that in interstellar space the distance between two electrons is about 0.87 cm. The electric force between them are repulsive. Calculate the electric force between these two electrons. The value of the Coulomb constant 9 × 109 N · m2/C2 and the elemental ...
*Sunday, March 3, 2013 by Terry*

**calculus**

Suppose you have 400 meters of fencing and you wish to enclose a rectangular space with two parallel partitions: What is the maximum total area of the enclosed space, in square meters?
*Saturday, March 2, 2013 by lisa*

**Physics**

A space probe is carried by a rocket into outer space where it continues to move on its own in a straight line. What keeps the probe moving? Is the answer: the gravitation forces from diﬀerent stars and planets
*Friday, March 1, 2013 by Sally*

**DVC**

use the inverse square law to show that in space shuttle territory, 200 kilometers above 94 percent of that at earths surface??
*Friday, March 1, 2013 by Anonymous*

**physics**

Scientists plan to release a space probe that will enter the atmosphere of a gaseous planet. The temperature of the gaseous planet varies linearly with the height of the atmosphere. The delicate instruments on board completely fail at a height of 61.5 kilometers. What is the ...
*Friday, March 1, 2013 by marcie*

**Physics**

A projected space station consists of a circular tube that is set rotating about its center (like a tubular bicycle tire) as shown in figure below. The circle formed by the tube has a diameter of about D = 1.28km. What must be the rotation speed (in revolutions per day) if an ...
*Friday, March 1, 2013 by Anonymous*

**biology help plz?????????????????**

Complete the following paragraph relating to the enzyme, β–galactosidase. This enzyme hydrolyses the disaccharide lactose to constituent monosaccharides, galactose and glucose. Drag and drop the appropriate words into the correct space. For white spaces in the ...
*Thursday, February 28, 2013 by centya*

**Electromagnetic spectrum**

Some astronomical objects emit no visible light but are known through (blank?) and radio images; satellite observations (blank?) Earth's atmosphere help scientists study space at wavelengths that do not reach Earth's surface?
*Tuesday, February 26, 2013 by Anonymous*

**Physics**

A 64.7 kg astronaut is on a space walk away from the shuttle when her tether line breaks. She is able to throw her 14.1 kg oxygen tank away from the shuttle with a speed of 7.45m/s to propel herself back to the shuttle. Assuming that she starts from rest (rela- tive to the ...
*Tuesday, February 26, 2013 by Ted*

**Linear Algebra**

Prove that If a vector space is of dimension n and a set of vectors spans V, then that set of vectors must be linearly independent.
*Tuesday, February 26, 2013 by John*

**physics**

For a safe re-entry into the Earth's atmosphere the pilots of a space capsule must reduce their speed from 2.6 104 m/s to 1.0 104 m/s. The rocket engine produces a backward force on the capsule of 1.7 105 N. The mass of the capsule is 3800 kg. For how long must they fire ...
*Monday, February 25, 2013 by kyoya*

**Physics**

A long, straight wire carrying a current of 317 A is placed in a uniform magnetic field that has a magnitude of 7.69 × 10-3 T. The wire is perpendicular to the field. Find a point in space where the net magnetic field is zero. Locate this point by specifying its ...
*Monday, February 25, 2013 by Anonymous*

**Science**

Proteins found on the outside of cells and viruses are called ____________ , these are used by the body to _______________ pathogens. antigens; help antibodies; make antigens; identify antibodies; reproduce Identify the response below that summarizes the correct sequence of ...
*Friday, February 22, 2013 by Brooke J.*

**science**

The moon is the earth's nearest neighbor in space the radius of the moon is approximately one quarter of the earth's radius and it's mass is one eightieth of the earth's mass.(a)calculate the weight of an object with a mass of 50.0kg on the surface of the moon...
*Thursday, February 21, 2013 by lebo*