Total # Posts: 20
You have 23.0g of water initially at -46°C. How much energy in joules is required to heat the ice to 0°C? c ice = 2.1 J/g°C. I thought joules was calculated by grams*change in temperature*specific heat. The answer I get from 23*46*2.1 is 2221.8, but web assign says...
March 1, 2015
The distance from City Y to City Z is 2.25 inches on the map. The actual distance is 45 miles. The distance from City X to City Y is 1.75 inches on the map. What is the actual distance, in miles, from City X to City Y?
January 21, 2015
This is a inelastic equation, so we use (m1+m2)vf = m1v1+m2v2, where m1 is 4 kg, m2= 9kg. The start with no velocity so Vf=0, meaning the left side is 0. m1v1=4 times 2 =8, We subtract to the left side and divide by m2, 9kg. v2 = 8/9 heading west.
November 9, 2014
A survey found that 12 out of 15 people prefer hamburgers over pizza. If 65 people are surveyed the next week, how many people will choose hamburgers? How do I work this problem?
September 18, 2014
the scale of a map indicates that 2 inches equals 5 miles. if the distance on the map between a school and a house is 12inches apart, what is the actual distance between the two buildings?
September 16, 2014
A child whose weight is 281 N slides down a 6.20 m playground slide that makes an angle of 45.0¡ã with the horizontal. The coefficient of kinetic friction between slide and child is 0.160. (a) How much energy is transferred to thermal energy? (b) If she starts at ...
May 6, 2012
In a popular amusement park ride, a rotating cylinder of radius 3.0 m is set in rotation at an angular speed of 0.80 revolutions per second. The floor then drops away, leaving the riders suspended against the wall in a vertical position. (a) What minimum coefficient of ...
October 20, 2011
Why do many African countries have so much foreign debt and why is it harmful to African civilians. They borrow money to help the country, then the leaders steal most of it. Graft and corruption are rampant. The poor remain poor, but the debt piles up for them to pay.
February 9, 2007