# Xian

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?

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

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?

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.

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

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?

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?

8. ## Math 9

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

9. ## Math 9

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

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?

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?

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?

13. ## Math

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

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?

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!

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