Popular questions and responses by Xian
  1. Physics Angular Motion

    a 5.0 kg mass attached to the end of a string swings in a vertical circle (radius 2m) when the mass is at its lowest point on the circle the speed of the mass is 12 m/s. What is the tension of the string at this point?

    asked on August 4, 2013
  2. Chemistry

    The method of standard additions was used to determine nitrite in a soil sample. A 1.00-mL portions of the soil extract sample was transferred to four 25-mL volumetric flasks. To each flask, increment volumes of a 1.00 x10-3M nitrite wasadded according to

    asked on May 15, 2020
  3. Physics

    A 2.4kg ball falling vertically hits the floor with a speed of 2.5m/s and rebounds with a speed of 1.5m/s. What is the impulse exerted on the floor?

    asked on July 13, 2013
  4. Math

    12. In a triangle ABC, AC = 36, BC = 48, and the medians BD and AE to sides AC and BC, respectively, are perpendicular. Find AB.

    asked on December 6, 2013
  5. math

    the hundred thousand digit of a six digit even number is 3 more than the thousand digit which is twice the ones digit .give atleast four numbers that satisfy the given condition

    asked on July 6, 2017
  6. MATH

    Two buses leave the same station at 8:00 pm. One bus travels north at the rate of 30 kph and the other travels east at 40 kph. How many kilometers apart are the buses at 10 pm?

    asked on March 29, 2017
  7. Math

    The surface area and the volume of a sphere are both 3 digit integers times π. If r is the radius of the sphere, how many integral values can be found for r?

    asked on December 26, 2013
  8. Math 9

    Find an equation for the perpendicular bisector of the line segment connecting the points (-2, 5) and (3, -7).

    asked on December 26, 2013
  9. Math 9

    Find the real number a for which the lines −4x+ 3y = 7 and ax− 2y = 4 will be perpendicular.

    asked on December 26, 2013
  10. Math

    In triangle MABC, D bisects side BC, G bisects side AB, and the points E and F trisect side AC. What is the area of the shaded polygon, if the area of MABC is 108?

    asked on December 6, 2013
  11. Math

    A bicycle has a 100 cm diameter wheel. If you ride on and around a circle with a 10 km diameter 12 times, how many revolutions does the wheel make?

    asked on December 6, 2013
  12. Math

    A 5 inch by 8 inch rectangle is enlarged to a similar rectangle whose smallest side measures 9 inches. What is the length in inches of the diagonal of the enlarged rectangle?

    asked on December 6, 2013
  13. Math

    What is the maximum number of points of intersection of two different lines and three different circles in the same plane?

    asked on December 6, 2013
  14. Physics Angular Motion

    A wheel with a radius of 1.5m rotates at uniform angular speed. If a point on the rim of the wheel has a centripetal acceleration of 1.2 m/s/s whats the points tangential speed?

    asked on August 4, 2013
  15. Physics

    A rifle with a weight of 20N fores a 5.0g bullet with a speed of 300m/s. (a) Find the recoil speed of the riffle (b) If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and the rifle. Please show work. Thank you!

    asked on July 14, 2013
  1. Chemistry

    Sorry it's quite confusing. Is your explanation similar to this video? around 8:37 minutes youtu(dot)be/rllHziqWlgU

    posted on May 15, 2020
  2. Chemistry

    vol. of standard nitrite added, mL 5.00 10.00 15.00 20.00 25.00 Absorbance 0.079 0.161 0.236 0.318 0.403

    posted on May 15, 2020
  3. French

    -J'ai besoin un crayon et un feuille de papier. -Avez-vous besoin un livre ou un cahier? -J'ai un dictionaire mais j'ai besoin un calculatrice.

    posted on October 30, 2014
  4. French

    there is supposed to be an accent on the "a" by the way...

    posted on October 30, 2014
  5. French

    Je vais attendre pour mon/ma ami(e) a venir. Future tense for "I am going to wait" is either... -Je vais attendre...............or -J'attendrai

    posted on October 30, 2014
  6. French

    Attention, s'il vous plait

    posted on October 30, 2014
  7. Physics

    Could you please explain how you got to your answer?

    posted on July 13, 2013