shirly

Most popular questions and responses by shirly
  1. physics

    A heat engine receives 7.0 x 10^3 J of heat and loses 3.0 x 10^3 J in each cycle. What is the efficiency? 1-30% 2-43% 3-57% 4-70% 5-100%

    asked on February 24, 2014
  2. physics

    20.00 cm of space is available. How long a piece of brass at 20°C can be put there and still fit at 200°C? Brass has a linear expansion coefficient of 19 × 10^-6/C°. 1-19.93 cm 2-19.69 cm 3-19.50 cm 4-19.09 cm

    asked on February 24, 2014
  3. physics

    A convex spherical mirror has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image located? Answer 12 cm in front of the mirror 60 cm behind the mirror 60 cm in front of the mirror none of the

    asked on March 17, 2014
  4. math

    the distance from the sun to earth is about 1.5x10^11 meters. suppose light travels at a speed of 3x10^8 meters per second. About how long does it take light from the sun to reach earth? PLEASE HELP!!!

    asked on December 26, 2014
  5. physics

    What is the ratio of the speed of sound in air at 0°C to the speed at 100°C?

    asked on March 17, 2014
  6. physics

    The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is:

    asked on March 13, 2014
  7. math

    Please help me to answer in four different ways by ADDITION ONLY: QUESTION; CONNIE HAS 18 APPLE AND MAE HAS 16 APPLE, HOW MANY APPLE THEY HAVE?

    asked on September 24, 2016
  8. physics

    1500 cm^3 of ideal gas at STP is cooled to -20°C and put into a 1000 cm^3 container. What is the final gauge pressure? 1-11 kPa 2-40 kPa 3-113 kPa 4-141 kPa 5-240 kPa

    asked on February 24, 2014
  9. math

    Connie has 18 and mae has 16 apple also. How many apple they have? Solve in four different ways.

    asked on September 24, 2016
  1. math

    Yes steve, solve the problem by adding only in 4 ways...

    posted on September 24, 2016
  2. math

    Thank you so much Ms.Sue

    posted on September 24, 2016