Sunday
December 11, 2016

Total # Posts: 94

Write an equation that includes division that relates the number of minutes a sperm whale can stay under water.🤔
March 10, 2016

physics
A(n) 0.251 kg soccer ball approaches a player horizontally with a speed of 15.8 m/s. The player illegally strikes the ball with her hand and causes it to move in the opposite direction with a speed of 27.3 m/s. What is the magnitude of the impulse delivered to the ball by the ...
February 16, 2016

physics
A(n) 23000 kg freight car is rolling along a track at 2.8 m/s. Calculate the time needed for a force of 1960 N to stop the car. Answer in units of s.
February 16, 2016

physics
Two students on roller skates stand face-toface, then push each other away. One student has a mass of 95 kg and the second student 60 kg. Find the ratio of the magnitude of the first student’s velocity to the magnitude of the second student’s velocity.
February 16, 2016

physics
why , regardless of the magnitude of the initial velocity, the maximum horizontal displacement for a projectile occurs when the angle is 45 degrees. Specifically, what happens when the angle is increased or decreased. How would you mention vector components and also ...
February 2, 2016

3/8 orange 8 green 12 orange 12 red
November 18, 2015

Physics
A block of mass 4 kg, which has an initial speed of 2 m/s at time t = 0, slides on a horizontal surface. Find the magnitude of the work that must be done on the block to bring it to rest. Answer in units of J. If a constant friction force of magnitude 5 Newtons is exerted on ...
November 18, 2015

Physics
A 4.17 g bullet moving at 506.1 m/s penetrates a tree trunk to a depth of 4.64 cm. a) Use work and energy considerations to find the magnitude of the force that stops the bullet. Answer in units of N. b) Assuming that the frictional force is constant, determine how much time ...
November 18, 2015

Physics
The efficiency of a pulley system is 47 percent. The pulleys are used to raise a mass of 47 kg to a height of 7.0 m. The acceleration of gravity is 9.81 m/s 2 . What force is exerted on the rope of the pulley system if the rope is pulled for 28 m in order to raise the mass to ...
November 18, 2015

physics
A 20 g bullet is accelerated in a rifle barrel 45 cm long to a speed of 354 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N.
November 18, 2015

Physics
A 7159 N piano is to be pushed up a(n) 2.26 m frictionless plank that makes an angle of 25.6 ◦ with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J.
November 18, 2015

Math
For the depth of water on Friday, 16 January 1998, the periodic function is: y = 1.05 sin 2pix/11.72 + 1.55 1.05 is the 'a' value 2pi/11.72 is the 'b' value 1.55 is the 'd' value we were told not to take into consideration the 'c' value in our ...
June 2, 2015

Physics
We have to work out the accepted value of a roller coaster cart (taking into account friction) when the mass is modified Here is the answer I got for 56.71 grams: 0=∆EGP+∆EK+Fd 0=mg(hf-hi )+1/2 m(v^2-u^2 )+Fd 0=0.05671 × 9.8 (0.075-0.786)+1/2× 0.05671 (...
June 2, 2015

Chemistry
What would have happened if Rutherford shot negative particles instead of positive particles in his gold-foil experiment? What would have happened if the nucleus in the gold-foil was actually negative, rather than positive, in his experiment?
June 1, 2015

History
Why was Ireland experiencing poverty in the late 1700's and early 1800's?
May 30, 2015

Maths
From looking at a periodic function, we had to decide on the equation for it. I got: y = 1.05 sin x2pi/11.72 + 1.55 1.05 is the 'a' value of the equation 2pi/11.72 is the 'b' value for the equation 1.55 is the 'd' value of the equation we were told not ...
May 29, 2015

History
Why was Ireland experiencing poverty in the 1800's?
May 29, 2015

Maths
does that mean it'll be above 1.7m from 6:16pm to 11:35pm as well?
May 28, 2015

Maths
I understand how you got 0.1433 and 2.9982 from using the CAST diagram, I'm just wondering why you need to do that? And I'm not sure how you converted 0.2673 and 5.5926 into hours and minutes
May 28, 2015

Maths
From looking at a periodic function, we had to decide on the equation for it. I got: y = 1.05 sin x2pi/11.72 + 1.55 1.05 is the 'a' value of the equation 2pi/11.72 is the 'b' value for the equation 1.55 is the 'd' value of the equation we were told not ...
May 28, 2015

math
Find the periodic payment R required to amortize a loan of P dollars over t years with interest charged at the rate of r%/year compounded m times a year. (Round your answer to the nearest cent.) P = 30,000, r = 5, t = 20, m = 4
April 27, 2015

statistics
A credit card company estimates that the average credit card balance of Americans is \$3,210. A statistics student wants to know whether this is true for citizens of her home town. Which hypothesis test would be most appropriate for addressing this question? One sample z-test ...
March 14, 2015

Social Studies
Can someone help me? I need it ASAP
March 3, 2015

Social Studies
1. What dynasty ruled the Korean peninsula from AD 668 to AD 935? Meiji Qin Silla*** Tokugawa 2. What type of government ruled North korea after World War II communist**** democratic dictatorship oligarchy 3.Both Japan and the Koreas been influenced by ________ the Tokugawa a ...
March 3, 2015

Physics
A plane is flying 250 m/s west with a crosswind of 25 m/s north affecting the flight. What is the magnitude and direction of the plane?
February 23, 2015

Exponents
Hi just curious when evalutating 5^-2 Would the answer be 25 Or would it be 0.4 = 2/5 I am lost
November 2, 2014

Algebra
If 4 notebooks weigh 2.8 pounds how do 6 notebooks weigh
September 2, 2014

Math
A ferris wheel has a diameter of 10 m and takes 24 sec to make one revolution. The lowest point on the wheel is 1 m above the ground. (4 marks) a. Sketch a graph to show how a rider's height above the ground varies with time as the ferris wheel makes a rotation. Assume the...
July 23, 2014

Math and Music
I have to do a presentation on how math and music relate. I have found some things and facts but everything is so complicated. If someone could help explain to me how I can narrow my topic down and make a presentation that is simple but effective. It can be anything within the...
March 21, 2014

Math palette of problems
If 2/9 gallon of water fills a bucket 3/5 full, how many gallons of water are needed to fill the bucket?
January 30, 2014

Physics
A block is sliding along a frictionless surface at a speed of 3.6 m/s. It hits a spring of spring stiffness constant k = 150 N/m. How far has the spring compressed when the block comes to a stop?
September 13, 2013

Physics
Paige and Julia are playing volleyball. Paige is in spiking position when Julia gives her the perfect set. The 0.226-kg volleyball is 2.29 m above the ground and has a speed of 1.06 m/s. Paige spikes the ball, doing 9.89 J of work on it. Determine a) the total mechanical ...
September 13, 2013

Chemistry
Six sig figs.
September 13, 2013

geometry
36 units
June 11, 2013

math
least to greatest 1/8,1/10,1/7
April 28, 2013

circle geometry
The correct answer is 301. Steve, in the first line is 129, not 29... and you shouldn't work with decimals because in the end the ugly dominator simplifies with the numerator.
March 8, 2013

November 10, 2012

About 70% of the human population can taste the bitter chemical phenylthiocarbamide (PTC), which is found in foods like broccoli. The allele, T, for tasting PTC is dominant over the allele, t, for not tasting it. Calculate the allele frequencies using the Hardy-Weinberg ...
November 10, 2012

Physics
A 59-kg housepainter stands on a 16-kg aluminum platform. The platform is attached to a rope that passes through an overhead pulley, which allows the painter to raise herself and the platform. (Ignore the mass of the pulley and any friction in the pulley.) (a) With what force ...
October 4, 2012

Physics
A box of mass m2 = 3.1 kg rests on a frictionless horizontal shelf and is attached by strings to boxes of masses m1 = 1.6 kg and m3 = 2.6 kg as shown below. Both pulleys are frictionless and massless. The system is released from rest. After it is released, find the tension in ...
October 3, 2012

Biology
Which of the following statements correctly compares the functions of a plant's roots and stem? The stem contains a high percentage of cells that provide structural support, unlike the roots. The stem is the first part of the plant to emerge from a seed, followed by the ...
September 28, 2012

math
i don't get it...
August 21, 2012

Government
July 21, 2012

Government
This case came about because President Marbury refused to honor the last-minute judicial appointments of Pres. Madison. A) True B) False 2. Marbury wanted the courts to issue of writ of mandamus, a court order forcing Jefferson to give him his commission. A) True B) False 3. ...
July 21, 2012

government
Which of the following is NO LONGER necessary for the right to vote?A) RegistrationB) CitizenshipC) Residency D) Land Ownership
July 5, 2012

Spanish
Fill in the blanks with words from the box. estés molesta plástico recicle sea Es posible que reciclar (1) una de las mejores formas de proteger el medio ambiente. Quizás no te das cuenta (you're not aware), pero reciclar vidrio, aluminio y (2) ahorra...
July 3, 2012

Spanish
Fill in the blanks with the subjunctive form of the verbs. 1. Me alegro de que el ecoturismo (ser) un buen negocio (business). 2. Es una lástima que tú no (reciclar) el vidrio. 3. No crees que ellos (querer) usar energía solar. 4.Ojalá todos ...
July 3, 2012

Biology
The Kingdom Monera has been separated into two domains, the Archaea and the Bacteria. Which of the following was most important in prompting scientists to change the way these organisms were classified? a.)Major differences were discovered in the structure and operation of the...
May 27, 2012

communication
I need to complete an outline and thesis statement on "Two female Chihuahuas living in the same household.I don't understand how and what information to write.
March 1, 2012

science
Two mineral samples have the same mass. Wich of the following statements is therefor true
January 17, 2012

Math Riddle-Algebra With Pizzaz
Page 157 how do you graph them
January 11, 2012

Math
October 30, 2011

Math
Simplify the Ratio 4in : 1 yd
August 24, 2011

Spanish
Please unscramble these Spanish words mincara, carbaa, tauerdis, tagsur, suar, qarilaul, caars, sotrecnat, piormcatr, bajra, gelral.
June 1, 2011

science
The enzyme that opens up the DNA double helix during replication.?
May 12, 2011

science
DNA is copied during a process called.?
May 12, 2011

math
\$80 \$110 \$130 \$160 \$210 \$650
May 11, 2011

physics
A mass was dropped from a height of 20m. (a) find its speed at impact. (b) what can you say about the initial GPE of the mass and the KE of the mass just as it hits the ground?
March 15, 2011

physics
From a tree that is 15m tall, a fruit of mass 2kg falls to the ground. (a) find the initial GPE (b) find the speed at impact (c) find the KE at impact (d) how much energy was lost to heat and sound after the mass came to rest?
March 15, 2011

physics
A mass of 2kg was thrown straight up with a speed of 15m/s. (a) find the initial KE (b) how high does the mass rise? (c) what is the GPE of the mass at the highest point?
March 15, 2011

chemistry
calculate the mass in grams of .354 moles of NH3
January 25, 2011

algebra 2
what is the quadratic function that has the roots (4+3i) and (4-3i)
January 19, 2011

math
How many people were at a party if There were 105 handshakes at a party and if each person at the party shook hands with exactly once with every other person. The answer is 15. How do I write the problem?
October 25, 2010

Math PIZZAZZ
it cant be halo...there are 14 answers
October 25, 2010

What is an example of natural selection in everyday life?
September 17, 2010

Art
okay, ummm my teacher wants us to write down what a proportion and scale isand what an economy is in art. So what are those????!!! I'm so confused! :P plz help!
September 17, 2010

math
ummm how old r u?
September 17, 2010

Physics
highway saftey engineers build soft barriers so that cars hittingthem will slow down at a safe rate. a person wearing a saftey belt can withstand an acceleration of 300 m/s how thick should barriers be to safely stop a car that hits a barrier at 110 km/h
September 9, 2010

physics
a plane travels 5.0 x 10^2 while being accelerated uniformly from rest at the rate of 5.0 m/s. what final velocity does it attain?
September 9, 2010

Physics
an astronaut drops a feather from 1.2 m above the surface of the moon. if the acceleration of the gravity on the moon is 1.62 m/s down , how long does it take the feather tho hit the surface
September 9, 2010

physical science
The density of copper is 8.92 g/cm (cubed). If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?
September 1, 2010

algebra2
Ms. Sue is only trying to tell you to do your homework!
August 29, 2010

Government Check
^^agreed.
June 23, 2010

?????? i don't get it
September 4, 2009

Physical Science
30,000N work=force times distance 300 times 100= 30,000
May 3, 2009

riddles
is this home work
April 21, 2009

umm this doesn't answer my question. I can not find it on the website.
April 21, 2009

chemistry home work
2 examples on sediment plz reply fast...
November 21, 2008

algebra
in my workbook it says give the opposite of each expression and the problems are: -10t+21 -x+2z there are alot more but i thought if someone explained a couple of these to me maybe id understand the rest. idk just please help me!!!
August 26, 2008

Physics
Predators
April 30, 2008

Basic Math
composite means that the # can be divided by one and it's self. so that means the anser is B
January 22, 2008

spelling
It says find 1 vowel and 1 consonat
January 22, 2008

spelling
there's a problem on my worksheet and it gose like this "to add the er suffix to words ending in a stressed sylable with one vowel and one consonant,___________________________." I've got that but then it asks for an example that's ware i'm stuck.
January 22, 2008

algebra
if the line is 3-5 then draw 2 lines from the 3 (on the side) and the 5 (on the bottem)and conect then.
January 22, 2008

math
THAT IS HARD WHAT GRAGE ARE YOU IN 100th!!!!
January 22, 2008

chemistry
what if more NO is added?
December 6, 2007

chemistry
for this reaction: 2NO + heat <-> N2 +O2 which way would the equillibrium shift if catalyst is added?
December 6, 2007

science
5 reasons that the eagle helps the ecosystem?
October 29, 2007

Trig
How do you tidy it up?
September 13, 2007

World History