# Questions Asked onSeptember 15, 2013

1. ## Physics

A map suggests that Atlanta is 730 miles in a direction 5.00° north of east from Dallas. The same map shows that Chicago is 560 miles in a direction 21.0° west of north from Atlanta. The figure below shows the location of these three cities. Modeling the

2. ## science

An astronaut of mass 120 kg recedes from her spacecraft by activating a small propulsion unit attached to her back. The force generated by a spurt is 30 N. Show that her acceleration is 0.25 m/s2.

3. ## physics

A copper wire has a resistance of 0.425 at 20.0°C, and an iron wire has a resistance of 0.455 at the same temperature. At what temperature are their resistances equal?

4. ## Physics

Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building

5. ## math

There is something wrong with this definition for a pair of vertical angles: “If AB and CD intersect at point P, then APC and BPD are a pair of vertical angles.” Sketch a counterexample to show why it is not correct. Can you add a phrase to correct it?

6. ## chemistry

To what pH should you adjust a standard hydrogen electrode to get an electrode potential of -0.124V V ? (Assume that the partial pressure of hydrogen gas remains at 1 atm.)

7. ## chemistry

The pKb of pyridine is 8.75. What is the pH of a 0.205M solution of pyridine?

8. ## History

2.What sensory imagery can you use to describe the Taino perspective on the encounter with the Europeans? Does anyone have examples on this?

9. ## Physics

If you simultaneously drop a pair of tennis balls from the top of a building, they strike the ground at the same time. If one of the tennis balls is filled with lead pellets, will it fall faster and hit the ground first? Which of the two will encounter

10. ## Mechanics

Calculate the average horsepower required to raise a 200-kg drum to a height of 20 in a time of 1:0 minute. Show the solution and answer

11. ## Geometry

The running track at the right is a rectangle with a half circle on each end. FI and GH are diameters. Find the area insidevthevtrack to the nearest tenth.

12. ## Algebra 2

The air resistance R(in pounds) on a racing cyclist is given by the equation R=0.00829s^2 where s is the bicycle's speed (in miles per hour). a. What is the speed of a racing cyclist who experiences 5 pounds of air resistance? b. What happens to the air

13. ## physics

A battery of emf and negligible internal resistance is connected to two resistances R1 and R2 in series. What is the potential difference across R2?(a)E(R1+R2)/R2(b)E(R1+R2)/R1(c)ER2/R1+R2(d)ER1/R1+R2

14. ## math

how many four letter words can be made fro the letters p,a,y,m,e,n,t with no repetition of any letters?

15. ## Microscopes

Which part of the microscope should you use to carry it? a. the stage b. the eyepiece c. the focus knobs d. the arm Is it the arm?

16. ## Physics

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.96 m to the north, d2 = 2.06 m northeast, and d3 = 1.13 m at 30.0° west of south (see the figure). Starting at the same initial point,

17. ## physics

(a) What is the hot resistance of a 24 W light bulb that runs on 120 V AC? (b) If the bulb's operating temperature is 2700°C, what is its resistance at 2570°C?

18. ## physics

As part of a class project you are given 0.900 g of nichrome and asked to fabricate a wire with uniform cross-section. You use up 95% of the nichrome and make a wire with a resistance of 0.840 Ω. The resistivity of nichrome is 1.00 10-6 Ω · m and its

19. ## physics

(a) What is the hot resistance of a 24 W light bulb that runs on 120 V AC? (b) If the bulb's operating temperature is 2700°C, what is its resistance at 2570°C?

20. ## trg

A plane flies in a direction of N70°E for 80 km and then on a bearing of S10°W for 150 km. a How far is the plane from its starting point? b What direction is the plane from its starting point?

21. ## Physics

A rocket is launched at an angle of 50.0° above the horizontal with an initial speed of 105 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move

22. ## Math

Alpha writes the infinite arithmetic sequence 10, 8, 6, 4, 2, 0... Beta writes the infinite geometric sequence 9, 6, 4, 8/3, 16/9,... Gamma makes a sequence whose n^th term is the product of the n^th term of Alpha's sequence and the n^th term of Beta's

23. ## Algebra

Solve the equation, if possible(answer or no solution); n-10=5/6n-7-1/3n

24. ## Algebra

Find the average speed Hike 52 miles in 3 days Drive 69 kilometers in 3/4 hour

25. ## Physics

At the 18th green of the US Open, Tiger Woods needs to make a 20.5 ft (6.25 m) birdie putt to win the tournament. When he hits the ball, giving it an initial speed of 1.57 m/s, it stops 6.0 ft. (1.83 m) short of the hole. Assume the deceleration caused by

26. ## English

Which sentence is in the active voice? The girl jumped on the trampoline. The cake will be served to the queen. Is it the first one? But, if so, then how can the second sentence be written in the active voice?

27. ## physics

Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740 kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 200 m high hill in 2.00

28. ## math

if the expression(2ya)4 is equivalent to 16y8 what is the value of a

29. ## chemistry

Suppose there are two known compunds containing the genetic elements X and Y. You have a 1.00-g sample of each compounds. One sample contains 0.33 g of X abd the other contains 0.42 g of X. Identify plausible sets of formulas for these two compounds.

30. ## MATH

What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?

31. ## physics

Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740 kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 200 m high hill in 2.00

80. ## World History

How are paintings similar to or different from public murals created today?

81. ## psychology

•Why is determining abnormal behavior or a mental disorder so difficult

82. ## pelling

list of long a spelling words for a second grade student

83. ## Chemistry

To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

84. ## chemistry

So I did an experiment at school in which we had to form 2.00 grams of precipitate by mixing 2 hydrated compounds. So for the products, obviously one of it is water, and the other 2 products are compounds, one of which, is insoluble. So when I measured the

85. ## biology

what are the differences between a vein and an artery? Give your answer with reference to specific examples. I don't know how to refer to specific examples...please help me..

86. ## Park University

The number of arrivals per period is distributed according to the Poisson with an expected value of 0.75 unit per period. The cost of waiting per unit per period is $3.20. The facility cost for serving one unit per period is$5.15. What expected service

87. ## maths

convert each of these decimal into fraction in its simplest form. a)0.179 b)0.125 c)0.003 d)3.8 e)2.5

88. ## Mechanics

A 1000-kg car whose motor delivers a maximum power of 40.0 hp to its wheel can maintain a steady speed of 130 km/h on a horizontal roadway. How large is the friction force that impedes its motion at this speed? Show the solution and answer

89. ## English

I'm embarrassed I can't figure this out on my own but I can't so here I am. I was giving these words and told to put them in " Letter by Letter Alphabetization " I'm confused by this and don't know how to figure out which word goes first and why. Please

90. ## Physics

Two colliding objects exert equal and opposite forces on each other (Newton's Third Law). However, acceleration experienced by an object is inversely related to its mass: the smaller the mass, the larger the acceleration for a given force (pp. 49-50).

91. ## math

Write the mixed number as a percent 6 ¾ Would it be 6(0.75) = 45% ?

92. ## Stressed out!

I know this site is about homework help but I was wondering if you can kind of help me make a "decision" so I'm a freshman and I'm taking honors history this year. I'm so stressed out from taking notes every night and studying. I have a C in that class

93. ## English

1. A lot of studens are studying in the study room. (Can we use the term 'study' room' as a big place where students can study together? Do you have some other expressions for that?) 2. He is in the reading room with his friends to read books. (Is it

94. ## Physics

A rocket is fired at a speed of 96.0 m/s from ground level, at an angle of 35.0 ° above the horizontal. The rocket is fired toward an 15.2-m high wall, which is located 32.0 m away. The rocket attains its launch speed in a negligibly short period of time,

95. ## physics

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.25 m/s. The car is a distance d away. The bear is 39.8 m behind the tourist and running at 7.36 m/s. The tourist reaches the car safely. What is the

96. ## Chemistry

To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

97. ## physics

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.49 m. If, in the course of an hour, the frog spends 32.5 % of the time resting and 67.5 % of the time performing identical jumps of that maximum length, in a straight

98. ## physics

A body immersed in liquid has an upthrust of 140N with a density of 12kg calculate the velocity

99. ## algebra

I need to find the profit for products sold. P(x) = -750x^2 + 15,000x x is the number/products sold Can you step by step please

102. ## chem quantity

a sample of soil containing hydrated barium chloride potassium chloride plus inert material weighd 0.8076g. tha sample was then dissolvd in water n treated with silver nitrate.tha resulting precipitate was collectd n found to weigh 0.5846g. calculate tha

103. ## physics

WHAT IS THE REASON BEHIND THE JISKHA"S TEACHERS TO BE NOTHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(except Writeacher and STEVE) ARE THEY DAFT OR NUISANCE!!!!!!!!!!!!!!!!!! ANSWWER Me QUICKLY !!!!!!!!!!!!!

104. ## health care

This week, you will create a PowerPoint presentation to help you prepare for your Final Paper. Submit a 10-slide (excluding title and reference slides) PowerPoint presentation that provides an overview of your research thus far for your Final Paper.

105. ## Physics

A ball is thrown upward from the ground with an initial speed of 23.2 m/s; at the same instant, another ball is dropped from a building 20 m high. After how long will the balls be at the same height?

106. ## chemistry

A 20.9 g sample of nitrogen gas combines completely with 4.5 g of hydrogen gas to form ammonia. What is the mass of ammonia formed? A 12.7 g sample of X combines with a 24.4 g sample of Y to form the compound XY2. What is the mass of the reactants?

107. ## Algebra

Four times a number is eight more than twice the same number

108. ## Research

Is it possible for someone to become deaf and mute at the age of ten while they were perfect before? If so, then what could be a reason that would lead them to lose both hearing and talking? Thank you in advance! All help is greatly appreciated :)

110. ## algebra

How do I solve this problem  ã2x -7+8=11

111. ## Finance question

Suppose CAPM is true. You are considering investing in an equally weighted portfolio of two stocks, A and B. The betas of these stocks to the market factor are 1.10 and 0.80, respectively. The total return volatilities of stocks A and B are σA=0.20 and

112. ## For Loli - persuasion

http://www.jiskha.com/display.cgi?id=1379184170

113. ## physics

I=0.5E0EO²C where E0 is the permitivity of the vacuum and C is the velocity of light. a)Show that the units of the equetion are consistant b)A certain helium-neon laser emits 0.20mW in a beam of cross sectional area 3.0mm.Determine the peak values of the

114. ## biology

Question: How many hydrogens are in this image? Image: oi43.tinypic[dot]com/2hxwql1.jpg (Replace [dot] with a period (.)) Oiriginal Question: (A) Enter the formula for Tamiflu by typing the number of each atom in the blanks. If Tamiflu does not contain any

Our large companies seem to be largely run by hired managers who work for salaries and who are not owner-entrepreneurs. How then do we get the profit motive into large companies?

116. ## chemistry

If a gas is made up of 3 parts hydrogen and 2 parts nitrogen...how much percentage of hydrogen is the gas made up of? The answer says 60%, but I don't understand how the came up with the answer

117. ## English

1. I'm going to cut tall grass around my ancestor's tomb/grave on Chuseok. 2. I am going to worship at my ancestor's grave. 3. I am going to pay a visit to my ancestor's grave. 4. I'm going to visit my ancestor's grave and worship at the grave. Then I will

118. ## Chemistry

A 18.2 g sample of an unknown compound contains 0.7 g of oxygen. What is the percent by mass of oxygen in the compound?

119. ## Chemistry

Expected number of moles of copper oxide (using the emprical formula of copper oxide and the starting moles of Cu)

120. ## world geography

you are an investor in virginia compny.in order to make a profit,you must encourage people to leave england and move to jamestown.create an advertisement describing the advantages of living in virginia.

121. ## Science

To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

122. ## Math

Find k such that the line [y=5x-4] is tangent to the function : x^2-kx

123. ## algebra

how do i solve ã(x+4) =y+2 solve for x.

124. ## algebra

I need to find the x coordinate of the vertex of parabola defined by f(x)= -5x^2 + 9x + 2 Can you please show steps. Thank you

125. ## 104 cilivi history

the Indian ocean was largely spared large-scale warfare because

126. ## mathT

The integer 90can be expressed as the sum of z consecutive integers. The value of z could be any of the following except A) 3 B) 4 C) 5 D) 6 E) 9

127. ## dma 040

Area of a certain state(state1) is five times the area of another state(state2). If the sum of their area is 6,000,000 square miles, find the are of each state state1 state2

128. ## math

How do I write this decimal, 0.44 as a percent?

129. ## math

What is the fraction as a percent 7/800? I divided 7 by 800 and got 0.00875 and moved the decimal two places to the right, would that be right .875% ?

130. ## algebra

R=ã(3V/ƒÎH) solve for V.

131. ## Flowers for Algernon

Explain Charlie's problems with women. Why does he have trouble getting close to them?

132. ## chemistry

Express the following numbers in scientific notation. (c) 0.9589 (d) 745 (e) 74100 (f) 0.002031

133. ## ALGEBRA

5x-3y=2x-xy solve for x

134. ## law

The insanity Defense can be used in cases involving capital punishment, correct?

135. ## maths

A truck rolls down a hill subject to acceleration due to gravity and resistance (including air resistance, rolling friction, etc) and the distance si (metres) travelled after ti seconds is observed. Classical mechanics predicts that the distance travelled

136. ## social studies

what is a culture and the types of culture

137. ## His 104 civilization 11

the Indian ocean was largely spared large-scale warfare because

158. ## Math

When mn+m^2-30n^2 is divided by m-5n, what is the quotient. Thank you

159. ## algebra

if f(X)=x^1/3+ 1/3x what is the value of f(27)

a(b+c)=bc

161. ## algebra

can someone help me with this please 2/3 ãx =8

162. ## arithmetic

If I WALK FROM MARKER 8.8 MILE TO MARKER 11.8 MILE HOW FAR IS THAT?

163. ## Math

For what constant value a is the following function continuous at x= -10 ? f(x)= (1/x+1/10)/(x+10) when x is not -10 f(x)= a when x= -10

164. ## integrated algebra ME 1

identify the sample and suggest a population from which it was selected. then classify the sample as sample, stratified, or systematic. explain your reasoning. 1} an insurance company checks every hundredth claim payment to ensure that claim have been

165. ## Math

5x/7+1/7-2x/4-6/4