Sunday

February 26, 2017
**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.(b)calculate the...

*Thursday, February 21, 2013 by lebo*

**physics**

the force required to maintain an object at a constant velocity in free space is eaqual to?

*Wednesday, February 20, 2013 by john*

**Business**

in what way is each of the following a marketing activity? a. the provision of sufficient parking space for custoemers at a suburban shopping mall b. the purchase by a clothing store of seven dozen sweaters in assorted sizes and colors. c. the inclusion of longer and more ...

*Wednesday, February 20, 2013 by Beverly*

**science**

There are two identical, positively charged conducting spheres fixed in space. The spheres are 44.6 cm apart (center to center) and repel each other with an electrostatic force of F1 = 0.0675 N. Then, a thin conducting wire connects the spheres, redistributing the charge on ...

*Tuesday, February 19, 2013 by Kels*

**science**

There are two identical, positively charged conducting spheres fixed in space. The spheres are 44.6 cm apart (center to center) and repel each other with an electrostatic force of F1 = 0.0675 N. Then, a thin conducting wire connects the spheres, redistributing the charge on ...

*Tuesday, February 19, 2013 by Kels*

**math**

. A bag contains 3 marbles: a red one, a white one, and a green one. Suppose that two marbles are selected without replacement. (a) How many outcomes are in the sample space? List them (b) What is the probability that a red marble, and then a green marble (in that order) are ...

*Tuesday, February 19, 2013 by James*

**Math-Please Help**

The arch is made up of equilateral triangular sections with double walls of steel 3 feet apart. Space between the walls is filled with reinforced concrete. Sizes of the sections vary, but a section at the bottom of the Arch has 54-foot sides and is 12 feet tall. About how much...

*Monday, February 18, 2013 by Barb*

**Physics 212**

Three equal point charges, each with charge 1.50\mu C , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are ...

*Thursday, February 14, 2013 by Paula*

**Math**

The school handy man measured the space needed for a new computer monitor in the science room at 20 3/4 inches. Which of these measures is NOT more precise? A. 20 1/2 inches B. 20 7/8 inches C. 20 15/16 inches D. 20 21/32 inches

*Thursday, February 14, 2013 by Anonymous*

**Math**

The school handyman measured the space needed for a new computer monitor in the science room at 20 3/4 inches. Which of these measures is not more precise? A. 20 1/2 inches B. 20 7/8 inches C. 20 15/16 inches D. 20 21/32 inches

*Thursday, February 14, 2013 by Anonymous*

**science**

how can space change your weight in space

*Thursday, February 14, 2013 by kelsey*

**Physics**

A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...

*Wednesday, February 13, 2013 by Randy*

**Physics**

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 25 m/s. (a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time...

*Wednesday, February 13, 2013 by Jordan*

**Stats / Prob**

Suppose a box of marbles contains equal numbers of red marbles and yellow marbles but twice as many green marbles as red marbles. Draw one marble from the box and observe its color. Assign probabilities to the elements in the sample space. (Give your answers as fractions.)

*Wednesday, February 13, 2013 by Anonymous*

**physics**

In a specific region of interstellar space the atomic composition of gaseous matter is 89.1% atomic hydrogen and 10.9% helium, the temperature is 27K and the pressure is 2.58x10^-15Pa. What is the density of matter in this region? What is the particle density?

*Wednesday, February 13, 2013 by alicia*

**math**

PHIL'S WIFE ROWENA, IS DECORATING A PORTION OF THE KITCHEN WALL BEHIND THE STOVE IN A MOSAIC MADE UP OF EQUAL NUMBERS OF BLACK,WHITE, AND RED TILES. THE SPACE MEASURES 6 FEET BY 2 FEET. THE MOSAIC TILES ARE 6 INCH SQUARES. HOW MANY RED TILES ARE REQUIRED?

*Tuesday, February 12, 2013 by pinky*

**Physics**

A spacecraft of mass 2000kg, moves at a constant speed of 7800m.s- in space. the main engine switched on for 10s during which time the exhaust gases travels at 10 000m.s-. As a result of this, the craft travels at 8000m.s- after 10s. Calculate the mass of the exhaust gas.

*Tuesday, February 12, 2013 by Kerry*

**PHYSICS**

Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator that has a fixed ...

*Tuesday, February 12, 2013 by HELP !!!!*

**physics**

Imagine a spring floating in space. This spring has a very small length when it is unstretched. The spring constant for this spring is 4.2 N/m. Now place 2.6 μC charges on each end of the spring, and allow it to stretch until it reaches a new equilibrium. What is the new ...

*Monday, February 11, 2013 by Noah*

**standard deviation**

If Professor Wilson found that the test scores of his students had a variance of 4.4, what is the standard deviation? Type a numerical answer in the space provided. Round your answer to the nearest tenth and do not type spaces in your answer.

*Monday, February 11, 2013 by racquel*

**socology**

what is the meaning of ventilation and space of structures

*Sunday, February 10, 2013 by tijani*

**Math**

A box contains a one-dollar bill, a five-dollar bill, a ten-dollar bill, and a twenty-dollar bill. Two bills are chosen in succession without replacement. Use a tree diagram to list the sample space for this experiment and then answer the following questions in fractions 1. ...

*Friday, February 8, 2013 by Kyle*

**space science**

What other challenges do you think there would be for engineers designing a spacecraft to travel to mercury?

*Thursday, February 7, 2013 by Angie*

**7 Science**

If earth was larger what would happen to it's atmosphere? It would expand It would evaporate It would be sucked into space It would become more dense

*Wednesday, February 6, 2013 by unknown.gonegirl*

**Math**

A photograph is 25 cm and 20 cm high. It must be reduced to fit a space that is 8 cm high. Find the width of the reduced photograph.

*Monday, February 4, 2013 by Sue*

**math**

perform the following unit conversion. 296 0z= ___________ lb 18.5, 55.5, 37, 74 My Answer is 18.5 Perform the following conversion. 32kg= ______ lb 16,320,70.4,14.4 My Answer is 70.4 Some people feel that the ideal temperature for an office space is 72.0 F. What is the ...

*Monday, February 4, 2013 by Suzy*

**college mathematics**

Three people are to be selected at random, each will be given one gift card. There is one card from Home Depot,one from Best Buy and one from Red Lobster. The first person selected will get to choose between the two remaining cards. The third person selected gets the third ...

*Monday, February 4, 2013 by carol*

**History**

NASA, space shuttles, and the International Space Station are (a)all related to Cold War spy technology (b) joint scientific study and space exploration efforts (c) United States efforts to build anti missile defenses (d) belief in extraterrestrial life

*Sunday, February 3, 2013 by Beth*

**statistics**

1. The scores on a standardized test for high school students are normally distributed with a population mean of 500 and a population standard deviation of 100. Use the empirical rule (0LI refers to this as the standard deviation rule.). Make sure you provide graphs for each ...

*Sunday, February 3, 2013 by lay*

**math**

Three people are to be selected at random, each will be given one gift card. There is one card from Home Depot,one from Best Buy and one from Red Lobster. The first person selected will get to choose between the two remaining cards. The third person selected gets the third ...

*Saturday, February 2, 2013 by carol*

**chemistry help !!!!!!!!!!!!!!!!**

complete the following paragraph relating to the enzyme,b -galactosidase .this enzyme hydrolyses the disaccharide lactose to constituent monosaccharides ,galactose and glucose ,drag and drop the approprite words into the correct space. the enzyme ,B-galactosidase is added to a...

*Saturday, February 2, 2013 by john*

**chemistry help !!!!!!!!!!!!!!!!**

complete the following paragraph relating to the enzyme,b -galactosidase .this enzyme hydrolyses the disaccharide lactose to constituent monosaccharides ,galactose and glucose ,drag and drop the approprite words into the correct space. the enzyme ,B-galactosidase is added to a...

*Saturday, February 2, 2013 by john*

**math**

Three people are being selected at random, each will be given one gift card. There is one card from Home Depot,one from Best Buy and one from Red Lobster. The first person selected will get to choose between the two remaining cards. The third person selected gets the third ...

*Friday, February 1, 2013 by carol*

**Tree diagrams**

Three people are being selected at random, each will be given one gift card. There is one card from Home Depot,one from Best Buy and one from Red Lobster. The first person selected will get to choose between the two remaining cards. The third person selected gets the third ...

*Friday, February 1, 2013 by carol*

**Intro to Computer Engineering**

When solving 5x^2-50x+125=0, a space alien got x=8 for one of the two roots. What possible base could the alien be using? (Note: the coefficients are also in this base. That is 5,50,125 are all in this mystery base as well)

*Thursday, January 31, 2013 by Joe*

**ENG**

I'm trying to write a paragraph with levels of generality for English. Here's what I have so far... I need help with grammar and punctuation... also does it make sense ? In the city of Carson, California there is a small house on Mesa Boulevard that is shared among five people...

*Tuesday, January 29, 2013 by LILY*

**writing**

Edit mMath Autobiography Theresa V. Monteiro MAT 095 11:00 AM – 12:15 PM My name is Theresa and I am from Norwalk Connecticut. I’ve been living here for a year now. I moved to New London Connecticut to start my life. I’ve taken care of all my immediate family and put my ...

*Monday, January 28, 2013 by Theresa*

**phy**

A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both ...

*Monday, January 28, 2013 by christ*

**math**

Consider the experiment of choosing the top 7 cards from a shuﬄed deck in two ways: (a) Without replacement. 1. What is the sample space? 2. What is the probability that you get only red cards? (b) With replacement. 1. What is the sample space? What is the probability ...

*Sunday, January 27, 2013 by Laura*

**math**

Suppose you roll a fair die 18 times. (a) What is the sample space? (b) What is the probability that each number from 1 to 6 appears exactly thrice? (c) What is the probability that the number 1 appears exactly twice, 3 appears exactly four times, and 5 appears exactly six times?

*Sunday, January 27, 2013 by Nikki*

**math**

A bag contains ﬁfty slips (small pieces of paper) with the numbers 1, 2, . . . , 50 written on them (One number on each slip!). Your friend writes down ten numbers from 1, 2, . . . , 50 on a sheet of paper, and then you draw—without replacement—twenty slips ...

*Sunday, January 27, 2013 by jane*

**cultural diversity**

NAEYC supports "third space" thinking as a desirable technique for use in A. stimulating children's right-brain processes. B.enhancing staff performance in the early childhood setting. C.Resolving conflicts, especially those involving cultural issues. D.training children to ...

*Sunday, January 27, 2013 by Rashmi*

**CALCULLUS**

Question 2: If is the position of a particle in space at time .Find the angle between the velocity and acceleration vectors at time

*Sunday, January 27, 2013 by NISARGILL*

**science**

Suppose you are an astronaut making a spacewalk outside the space shuttle. In your excitement about your walk,you use up all the gas in your reaction jet. How do you get back to the shuttle

*Thursday, January 24, 2013 by angel*

**Earlychilodhood education**

Which one of the following is probably NOT one of the reasons that circle times fail? A. The space was large and open. B. The songs were repeated daily. C. The time period lasted too long. D. The teacher read a chapter book, hoping to encourage the children to excel.

*Sunday, January 20, 2013 by Farida*

**Computer Harware**

You have a single hard drive on your computer that contains two NTFS partitions. Your computer's operating system alerts you that the C partition is running out of room. Your E partition still has 75 gig of free space. What is the least intrusive way to alleviate this problem...

*Saturday, January 19, 2013 by Beth*

**math**

A refrigerator is 3 ft wide, 2 ft deep, and 6 ft high. How much floor space does it cover? What is the volume?

*Tuesday, January 15, 2013 by rach*

**Outline**

When you make an outline format, do you make spaces in between each topic. For example: A.topic a.detail b.detail i.detail of a detail i.detail of a detail DOES A SPACE GO IN BETWEEN THESE TWO TOPICS? B.topic.......and so on.

*Tuesday, January 15, 2013 by Wendy HELP!!!*

**math**

Consider the experiment of drawing two cards from a deck in which all picture cards have been removed and adding their values (with ace = 1). a. Describe the outcomes of this experiment. List the elements of the sample space. b. What is the probability of obtaining a total of ...

*Tuesday, January 15, 2013 by jonsson*

**physics**

When an air capacitor with a capacitance of 400 (1 = ) is connected to a power supply, the energy stored in the capacitor is 2.05×10−5 . While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that completely fills the space between ...

*Tuesday, January 15, 2013 by Patty*

**physics**

When an air capacitor with a capacitance of 400 (1 = ) is connected to a power supply, the energy stored in the capacitor is 2.05×10−5 . While the capacitor is kept connected to the power supply, a slab of dielectric is inserted that completely fills the space between ...

*Tuesday, January 15, 2013 by Patty*

**Physics**

Hi. I am Walter White. I am good at chemistry but suck at physics. Can you help me? ---------------------------------------- Bob is traveling in a very fast space (v=0.8c) away from Alice, who is sitting still in an observatory watching him through a very good telescope...

*Monday, January 14, 2013 by Walter White*

**7th grade art ASAP please**

1. This occurs when an animal, object, or idea is given human form or characteristics. (1 point) literalism symbolism personification allusion 2. This occurs when you make reference to a well-known character, person, place, or event from life or literature. (1 point) ...

*Monday, January 14, 2013 by Delilah*

**Art**

When looking at fabrics, an interior designer will focus on these characteristics. (1 point) shape and form space and color color, texture, and pattern proportion and emphasis

*Monday, January 14, 2013 by RainbowDragon*

**put was or were in the space**

Tom and Ben ( ) playing

*Sunday, January 13, 2013 by grammar*

**put was or were in the space**

The girl has or have

*Sunday, January 13, 2013 by grammar*

**space science?**

Which star is the densest: Antares, Spica, or Polaris?

*Sunday, January 13, 2013 by Anonymous*

**geometry**

What do you do to figure out space in irregular shapes?

*Saturday, January 12, 2013 by Mommy*

**Physics**

The International Space Station is 370 km above the Earth's surface (Re = 6378 km, Me = 5.98 x 10^24 kg). What is the linear velocity of the space station in m/s

*Friday, January 11, 2013 by Alex*

**physics**

Spaceman Spiff's space box wights 60N. its engine exerts a +312N of force at lift-off. what is the acceleration when it lifts off

*Thursday, January 10, 2013 by felipe*

**Computer**

Your computer is running a lot of services and applications when you log on that you never use. What implications can this mean for your computer? A. Unused services and applications take up valuable hard drive space. B. Your computer uses more power than it needs to. C. 32 ...

*Thursday, January 10, 2013 by Nikki*

**English**

The space shuttle was both a marvel and huge.

*Thursday, January 10, 2013 by Anonymous*

**Please CHECK thanks**

Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ...

*Wednesday, January 9, 2013 by Morgan Stevenson*

**Somebody check this plz..and thanks.**

Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ...

*Wednesday, January 9, 2013 by Morgan Stevenson*

**Geometry**

Check please? The path of the launching of a space shuttle can be described best as a Answer: Ray?

*Wednesday, January 9, 2013 by Victoria*

**Cosmology**

Which of the following phenomena is NOT a consequence of Special Relativity? - Mass-energy curves space-time - Length contraction - Time dilation - Mass can not travel faster than the speed of light

*Tuesday, January 8, 2013 by qwerty*

**Will somebody help me please?**

1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...

*Tuesday, January 8, 2013 by Morgan Stevenson*

**I need help..**

1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...

*Monday, January 7, 2013 by Morgan Stevenson*

**Please guys. Help me out.**

1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...

*Monday, January 7, 2013 by Morgan Stevenson*

**Science Help! I have a deadline!!**

Match the following. 1. Rocky Mountain spotted fever 2. information about plants 3. eroded material 4. sun, wind, thermal 5. yellow fever and malaria 6. receives radio waves 7. major problem of underdeveloped nations 8. method of mountain formation 9. producer of oxygen a. ...

*Monday, January 7, 2013 by Morgan S*

**Science Somebody Help Me Please..I have a deadline**

1. Diarrhea can be caused by a change in diet and different minerals in the water. True False 2. Fusion produces less radioactivity than fission. True False 3. Wise travelers eat only cooked vegetables in underdeveloped areas. True False 4. The kilogram is the basic unit of ...

*Monday, January 7, 2013 by Morgan S*

**Probability**

Let S={s1,s2,s3,s4} be a sample space with probability distribution P, given by P(s1)= 0.5, P(s2)= 0.25, P(s3)= 0.125, P(s4)= 0.125. There are sixteen possible events that can be formed from the elements of 'S'. Compute the probability and surprise of these events.

*Saturday, January 5, 2013 by Mujtaba*

**7th grade social studies**

1. To pinpoint the absolute location of a place, geographers use (1 point) nearby landmarks. the Atlantic and Pacific oceans. the North and South poles. latitude and longitude. 2. What does the theme of movement help geographers to understand? (1 point) a location's physical ...

*Tuesday, January 1, 2013 by Delilah*

**Financial management**

ABC Construction and Leasing Company are interested in investing in the residential real estate market due to a relatively low interest rate environment. The Company appointed you to be in charge of the project feasibility study. You have just visited a 35-year old, well-...

*Tuesday, January 1, 2013 by Mike*

**maths**

10. A company involved in the assembly and distribution of printers in concerned with two types – laser and inkjet. Assembly of each laser printer takes 2 hours, while each inkjet printer takes 1 hour to assemble, and the staff can provide a total of 40 person-hours of ...

*Friday, December 28, 2012 by Anonymous*

**Math**

The diameter of an atom is 2.3 x 10^ -8 centimeters. How many atoms can fit in a space .003 centimeters long, without exceeding it? Please help, thank you

*Sunday, December 23, 2012 by Kiki*

**Physics**

A small spaceship whose mass is 1.5x10^3 kg (include-ing an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 10 kW laser beam, what speed will the ship attain in 1.0 day because of the momentum carried away by...

*Thursday, December 20, 2012 by Brian*

**English 8R - Essay Check (plzzz read!)**

Please check my English essay to see if it's good. I need help with my conclusion. There are similarities and differences of the activities that take place in both urban and rural setting. The activities that take place in both rural and urban setting of these two pieces. ...

*Tuesday, December 18, 2012 by Lauren*

**Geometry**

how is the coordinate system used in navigation, archaeology, and space? please help!!! links and answers alike would be great! thanks :)

*Tuesday, December 18, 2012 by BaileyBubble*

**Math**

Philip has 35 comic books. Of those comics, 2/10 take place in space. How many of Philip's comic books take place in space?

*Friday, December 14, 2012 by Anonymous*

**math**

I have a diagram of an occupied building space within a larger building represented by 49 equal squares but no linear measures for the sides. The space is 120,000 sq ft. how can i estimate the lengths and widths of the floor space with just this information?

*Thursday, December 13, 2012 by Barry*

**english 3**

Is this a parallel sentence? If so how can it be written more simpler. The space shuttle was both a marvel and huge.

*Tuesday, December 11, 2012 by hazzel*

**A probability question i think**

In a chess variant, a "lord" can move one space at a time, either upward, or to the right, or diagonally upward and to the right. How many ways are there for a lord to move from the bottom left to top right corner of the 8 by 8 chessboard? Thanks in advance for helping me!

*Tuesday, December 11, 2012 by Knights*

**trigonometry**

a space shuttle pilot flying toward the suez canal finds that the angle of depression on one end of the canal is 38.5 degree and the angle of depression to the other end is 52.75 degree. if the canal is 100.6 mi long, find the altitude of the space shuttle.

*Monday, December 10, 2012 by riza*

**CJS/250**

Will someone please help me find a website to research the following questions? Write a 750- to 1,050-word paper discussing the relationship between private and public police. Is this relationship positive or negative? Provide specific examples to support your opinion. Discuss...

*Sunday, December 9, 2012 by sade c*

**Physics**

A rapidly changing magnetic field in any region of space induces a rapidly changing A.Magnetic field or B.Electric field? which in turn induces a rapidly changing A.Magnetic field B.Electric field?

*Saturday, December 8, 2012 by Katie*

**ECE**

the child development checklist is an observation tool that? A.can only be used by one observer for the same child B.omits references to childrens emotions. C.includes space to record non-objective data. D.focuses on sequences of child development

*Friday, December 7, 2012 by Leeann*

**English - ms. sue**

Ms. Sue, my sister write out story here it is. On Monday she looked in her mailbox, although she had no reason to expect a letter so soon. But there it was, a small, square car. She held it in her two hands, testing its weight. It was an invitation to an exhibition of drawings...

*Thursday, December 6, 2012 by Mohammad*

**physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...

*Thursday, December 6, 2012 by Danny*

**Math 8th Grade Please help**

The radius of Earth is 6,371 kilometers. A space shuttle orbits 315 kilometers above the surface of Earth. The space shuttle completes 240° of a revolution around Earth in one hour. What is the average speed of the space shuttle? Choose the closest answer. Please help both ...

*Wednesday, December 5, 2012 by Chris*

**Physics**

Figure 18-46 shows a hydraulic lift operated by pumping fluid into the hydraulic system. The large cylinder is 40 cm in diameter, while the small tube leaving the pump is 1.7 cm in diameter. A total load of 2500 kg is raised 2.2 m at a constant rate. Neglect pressure ...

*Wednesday, December 5, 2012 by Drake*

**Physics**

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the speed of a 94-kg ...

*Monday, December 3, 2012 by Caleb*

**science**

Grapic organizer.show details that support this main ideals.thermal energy moves through solids liquid, gases and space

*Monday, December 3, 2012 by anonymous*

**General Chemistry I**

A sample of a compound containing only Br and O reacts with an excess of H2 to give 6.601 g of HBr and 3.919 g of H2O. What is the empirical formula of this compound? a. BrO b. BrO2 c. Br2O d. BrO3 e. None of the above I already know the answer is (e), but I am not entirely ...

*Monday, December 3, 2012 by Emily*

**physics**

. The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? B) What is ...

*Monday, December 3, 2012 by Chelsey Achord*

**wireless communications**

what is the period of the space shuttle traveling at 250km above the earth and what is its velocity

*Sunday, December 2, 2012 by tony*

**Physics**

A 83.5 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 35.5 m behind the ship, at rest relative to the spaceship. The only way to return to the...

*Sunday, December 2, 2012 by Emily*

**physics**

Two astronauts, each having a mass of 78.5 kg, are connected by a 10.0-m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 5.50 m/s. Treating the astronauts as particles, calculate each of the following...

*Saturday, December 1, 2012 by heather*

**Astronomy Grade 9( PLEASEEE HELP!!!!!!!!!!!!!!)**

What hazards do humans face when they are in space and what technologies have been developed in response to these hazards?

*Thursday, November 29, 2012 by Curly Sue*

**Chemistry**

Astronomers have detected hydrogen atoms in interstellar space in the n=732 energy level. Suppose an atom in this excited state emits of a photon and undergoes a transition from n=732 to n=632. How much energy does the atom lose as a result of this transition? what is the ...

*Thursday, November 29, 2012 by Carice*