Einstein

Most popular questions and responses by Einstein
  1. Physics

    A rifle is fired in a valley with parallel vertical walls. The echo from one wall is heard 1.0s after the rifle was fired. The echo from the other wall is heard 1.0s after the first echo. How wide is the valley?

    asked on December 6, 2007
  2. Physic

    A 65 kg dancer leaps .32 m high. a) With what momentum does the dancer reach the ground? b) What impulse is needed to make a stop? c) As the dancer lands, the knees bend, lengthening the stopping time to .050 s. Find the average force exerted on the body.

    asked on December 14, 2007
  3. Physics

    The velocity of the transverse waves produced by an earthquake is 7.2 km/s, while that of the longitudinal waves is 4.2 km/s. A seismograph records the arrival of the transverse waves 68 s before that of the longitudinal waves. How far away was the

    asked on December 14, 2007
  4. Physics

    A car is driven at a constant speed of 21 m/s (76km/h) down a road. The car's engine delivers 52 kW of power. Calculate the average force of friction that is resisting the motion of the car. My thinking: Convert 52 kW to 5200 W. Force of friction = force

    asked on November 14, 2007
  5. Physics

    Rachel pulls her 13 kg suitcase at a constant speed by pulling on a handle that makes an angle x with the horizontal. The frictional force on the suitcase is 28 N and Rachel exerts a 44 N force on the handle. a) What angle does the handle make with the

    asked on December 14, 2007
  6. Physics

    A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?

    asked on December 14, 2007
  7. Social Studies

    In the Supreme Court case Worcester v. Georgia (1832), the Court declared that Georgia’s laws _____ within Cherokee territory.

    asked on February 2, 2018
  8. Physics

    A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers? I was given this reply: The air force on the prop blades is what accelerates the helicopter upward. Use good old Newton's second law: F = M a

    asked on December 15, 2007
  9. Physics

    One closed pipe organ has a length of 2.5 m. The frequency of the note is 34.3 Hz. When a second pipe is played at the same time, a 1.7 Hz beat note is heard. By how much is the second pipe too long? Would you have to use the frequency of the second pipe

    asked on December 6, 2007
  10. Physics

    A 20.0 kg cart is moving with a velocity of 7.30 m/s down a level hallway. A constant force of -11.0 N acts on the cart and its velocity becomes 3.50 m/s. a) What is the change in kinetic energy of the cart? b) How much work was done on the cart? c) How

    asked on November 16, 2007
  11. Physics

    Carol drops a stone into a mine shaft 12.6 m deep. How soon after she drops the stone does she hear it hit the bottom of the shaft?

    asked on December 6, 2007
  12. Physics

    A constant net force of 406 N, up, is applied to a stone that weighs 33 N. The upward force is applied through a distance of 2.4 m, and the stone is then released. To what height, from the point of release, will the stone rise? Thoughts: F = ma. Would the

    asked on December 14, 2007
  13. Physics

    A constant net force of 406 N, up, is applied to a stone that weighs 33 N. The upward force is applied through a distance of 2.4 m, and the stone is then released. To what height, from the point of release, will the stone rise? I was given this reply: The

    asked on December 15, 2007
  14. Physics

    An archer puts a 0.28 kg arrow to the bow string. An average force of 200 N is exerted to draw the sting back 1.1 m. a) Assuming no frictional loss, what speed does the arrow leave the bow? b) If the arrow is shot straight up, how high does it rise? My

    asked on November 16, 2007
  15. math

    What is the answer to 14m= cm

    asked on August 8, 2012
  16. Math

    Is it 2:57

    asked on August 14, 2012
  17. Math

    Ms.Sue the answer is 2:47.I'm sorry for taking so long.

    asked on August 14, 2012
  18. Creative Writing

    I am working on an oral presentation on Dorothy Parker for my creative writing class. I am required to focus on her non-fiction work. I have researched her endlessly and have come up with nothing. Everything that I am finding concerns her poems and short

    asked on November 24, 2008
  19. Physics

    An experimental train has a mass of 1.70e4 kg and is powered across a level track by a jet engine that produces a thrust of 4.90e5 N for a distance of 520 m. a) Find the change in kinetic energy. b) Find the final kinetic energy of the train if it started

    asked on November 16, 2007
  20. Social Studies

    Believing they had no choice, most Native American leaders in the Southeast signed treaties giving up their lands in the 1820s and 1830s. They agreed to move west to what was called the Indian Territory in present-day _____.

    asked on February 2, 2018
  21. Math

    here is the problem Ms.Sue 6:32,9:29.

    asked on August 9, 2012
  22. Math

    dear Ms.Sue what do they mean when they say find the tiime lapse.

    asked on August 9, 2012
  23. Math

    waht are lapse

    asked on August 9, 2012
  1. chemistry

    47.6

    posted on October 1, 2018
  2. physics

    PE going into the down side: mgH KE is translational, and rotational or mgH=1/2 m v^2 + 1/2 Imr^2*w^2 mgH=1/2 m v^2 + 1/2 (1/2)mr^2*w^2 but when rolling, w=v/r mgH=1/2 m v^2+1/4*mv^2 =3/4mv^2 On the second side, rolling doesn t happen, the shell just

    posted on April 24, 2018
  3. physics

    PE going into the down side: mgH KE is translational, and rotational or mgH=1/2 m v^2 + 1/2 Imr^2*w^2 mgH=1/2 m v^2 + 1/2 (1/2)mr^2*w^2 but when rolling, w=v/r mgH=1/2 m v^2+1/4*mv^2 =3/4mv^2 On the second side, rolling doesn t happen, the shell just

    posted on April 20, 2018
  4. science

    why are you guys talking about me

    posted on March 23, 2018
  5. math

    x=3 and y=2

    posted on June 9, 2017
  6. Msth

    1.C 2.C 3.D 4.A 5.C

    posted on December 7, 2016
  7. Physics

    I don't frickin know that's why im here to scheme answers not to give

    posted on October 13, 2016
  8. chemistry

    0.5 moles of methane

    posted on May 22, 2016
  9. physics

    3.14 m/s

    posted on November 6, 2014
  10. biology

    You're in Mr. Moyer's Bio 205 class at WWU? If you check out page 317 of our book it really helps! "The bulk of the human genome is made of non-coding and repetitive nucleotide sequences" or junk. Hope that helps! Good luck tomorrow :)

    posted on March 1, 2013
  11. Math

    Ms.Sue the answer is 2:47.And i'm sorry for taking so long.

    posted on August 14, 2012
  12. Physics

    I believe the units for latent heat are kJ/kg. so should ur answer be in kJ/(kg*km^2)? I don't understand the rest of the problem though.

    posted on April 18, 2012
  13. Algebra

    y-5>-14 add 5 both sides y-5+5 > -14 + 5 y > -9 set of values is y greater than -9

    posted on March 5, 2009
  14. Alegebra

    Substitute y = 0 for x -intercept and solve for y

    posted on March 5, 2009
  15. Physics

    D = 685.44 km Thanks a lot!!

    posted on December 15, 2007
  16. Physics

    Thanks for your help.

    posted on December 14, 2007
  17. Physic

    A) Momentum = (2.465)(65) = 160.222 kgm/s B) 160.222 kgm/s C) Force = 160.222/.050 = 3204.441 N D) 3204.441/[(65)(9.8)] = 5.031

    posted on December 14, 2007
  18. Physics

    The mine shaft is 122.6 m deep. How do I find time?

    posted on December 6, 2007
  19. Physics

    Yes, I am supposed to use 343 m/s so: (343)(1)(.5)+(343)(2)(.5)=514.5 m/s

    posted on December 6, 2007
  20. Physics

    The mine shaft is 122.6 m deep. How do I find time?

    posted on December 6, 2007
  21. Physics

    Thank you!!

    posted on November 15, 2007
  22. Physics

    Thank you!!

    posted on November 15, 2007