Orla
Most popular questions and responses by Orla
Calculus
The area of a wetland drops by 1/4 every 8 years. What percent of its total area disappears after 40 years? Percent lost %?
asked on March 11, 2013 
physics
The distance between the lenses of a microscope is 18 cm. The focal length of the eyepiece is 1.8 cm. If the microscope is to produce an angular magnification of 260 when used by a person with a normal near point (20 cm from the eye), what must the focal
asked on April 6, 2016 
Physics
A bat emits a sound whose frequency is 83.2 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 40.5 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of the
asked on January 15, 2013 
Physics
In doing a load of clothes, a clothes dryer uses 16 A of current at 240 V for 45 min. A personal computer, in contrast, uses 2.7 A of current at 120 V. With the energy used by the clothes dryer, how long (in hours) could you use this computer to surf the
asked on February 13, 2013 
Physics
On earth, two parts of a space probe weigh 18300 N and 4440 N. These parts are separated by a centertocenter distance of 5.11 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the
asked on October 19, 2012 
Physics
An object has an angular size of 0.0140 rad when placed at the near point (20.0 cm) of an eye. When the eye views this object using a magnifying glass, the largest possible angular size of the image is 0.0490 rad. What is the focal length of the magnifying
asked on April 6, 2016 
Physics
You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the oars) toward you, it moves a distance of 1.2 m in a time of 1.4 s. The readout on the display indicates that the average power you are producing is 78 W. What
asked on October 30, 2012 
Chemistry
A 0.5370 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 1.2523 g. What is the mass
asked on October 25, 2012 
physics
Dolphins emit clicks of sound for communication and echolocation. A marine biologist is monitoring a dolphin swimming in seawater where the speed of sound is 1523 m/s. When the dolphin is swimming directly away at 5.5 m/s, the marine biologist measures the
asked on January 18, 2013 
Physics
A speed skater goes around a turn that has a radius of 31 m. The skater has a speed of 13 m/s and experiences a centripetal force of 460 N. What is the mass of the skater?
asked on October 25, 2012 
PHYSICS
An amplified guitar has a sound intensity level that is 11 dB greater than the same unamplified sound. What is the ratio of the amplified intensity to the unamplified intensity?
asked on April 6, 2016 
PHYSICS
Assuming an object at infinity, a person has far points of 5.2 m from the right eye and 6.2 m from the left eye. Describe the lens required (diopters) as seen in a prescription for the refractive power of each corrective contact lens.
asked on April 6, 2016 
Maths *have answer, want method* Urgent!
Suppose that the blood pressure of the human inhabitants of a certain Pacific island is distributed with mean, \mu = 108 mmHg and standard deviation , \sigma = 6 mmHg. According to Chebyshev's Theorem, at least what percentage of the islanders have blood
asked on April 13, 2013 
Physics
John’s mass is 81.0 kg, and Barbara’s is 62.4 kg. He is standing on the x axis at xJ = +9.41 m, while she is standing on the x axis at xB = +4.34 m. They switch positions. How far and in which direction does their center of mass move as a result of the
asked on November 7, 2012 
Physics
Traveling at a speed of 19.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.620. What is the speed of the automobile after 1.46 s have elapsed?
asked on October 19, 2012 
Physics
A satellite has a mass of 6179 kg and is in a circular orbit 4.83 × 105 m above the surface of a planet. The period of the orbit is 2.4 hours. The radius of the planet is 4.03 × 106 m. What would be the true weight of the satellite if it were at rest on
asked on October 25, 2012 
maths
find the coordinates of the points where l cuts the axes. line equation l is 5+y2x=0
asked on June 6, 2017 
PHYSICS
When a person wears a hearing aid, the sound intensity level increases by 35 dB. By what factor does the sound intensity increase?
asked on April 6, 2016 
PHYSICS
A string on a violin is tuned to vibrate at a fundamental frequency of 65.0 Hz. If the tension in the string were increased by a factor of three, what would be the new fundamental frequency?
asked on April 6, 2016 
Physics (Please, it's a minor error)
A rectangular block has dimensions 1.5cm x 3.2cm x 3.9cm and a mass of 61g. Determine the density in SI units My taking on the question, Mass= 0.061kg Volume= 0.1872m Density=0.061kg/0.1872m=0.3258547kgm^3 Can someone please tell me where I'm going wrong?
asked on November 19, 2012 
Physics
The mass of a string is 6 grams, and it is stretched so that its tension is 150 N. A transverse wave travelling on this string has a frequency of 160 Hz and a wavelength of 0.40 m. What is the length of this string? (ii) A chain saw has a measured sound
asked on April 6, 2016 
Physics
Can anyone help with the following? I think i have the answer i would just like to verify that it is correct, An equipotential surface that surrounds a point charge q has a potential of 490 V and an area of 1.1 m2. Determine q
asked on February 13, 2013 
Physics
A satellite has a mass of 6179 kg and is in a circular orbit 4.83 × 105 m above the surface of a planet. The period of the orbit is 2.4 hours. The radius of the planet is 4.03 × 106 m. What would be the true weight of the satellite if it were at rest on
asked on October 23, 2012 
maths stats
Please unscramlbe aaeebllnn which is a name. Thanks
asked on May 5, 2011

Maths *have answer, want method* Urgent!
82.64%
posted on April 13, 2013 
Calculus
40/8=5 .75^5=0.2373 10023.73=76.27% thanks :)
posted on March 12, 2013 
algebra
Domain: The domain of a function is the set of all possible input values (usually x), which allows the function formula to work. Range: The range is the set of all possible output values (usually y), which result from using the function formula.
posted on October 30, 2012 
Physics
Thank you for the answer, I probably should have specified that I only wanted a formula to help me figure it out, but thanks :)
posted on October 19, 2012