Search & Filtering
A 40.0 g sample of ethanol releases 2952 J as it cools from 50.0 °C. Calculate the final temperature of the ethanol.
If it takes 640 J of heat energy to increase the temperature of 100 g of a substance by 25˚C (without changing its phase), calculate the specific heat of the substance.
An object doing work at 541 J while losing 134 J of heat, calculate the value of E.
Many things can contaminate urban storm water, including discarded batteries. When these batteries rupture, they discharge elements that are harmful to the environment. The sample mean zinc mass of 27 Panasonic AAA batteries was examined and found that it was 2.06g, with a sample standard deviation of 0.141g. Does this data provide compelling evidence for concluding that the population mean zinc mass exceeds 2.0g? Use a significance level α=0.05 to test the hypotheses.
Val wanted to know the average shearing strength, in pounds (lbs.), of a particular kind of rivet sold in a hardware store. He tested 20 rivets as samples and got the following results.
518
490
513
598
510
532
512
455
500
512
501
487
498
496
500
498
515
520
497
502
Construct a confidence interval for the population mean using 99% confidence.
Write a program to print T in all scales viz Celsius, Fahrenheit, and Kelvin.
what is the ratio of diffusion of the following:
A. Ne and Ar
B.PH3 and NH3
C.C4H10 and C2H4
A uniform rod 8m long weighing 5kg is supported horizontally by two vertical parallel strings at P and Q, and at distances of 2m and 6m from one end. Weights of 1kg, 1.5kg and 2kg are attached at distances of 1m, 5m and 7m respectively from the same end. Find the tension in each vertical string.
An ideal gas at temperature T0 is slowly compressed at constant pressure of 2 atm from
a volume of 10 liters to a volume of 2 liters.
Then the volume of the gas is held constant
while heat is added, raising the gas temperature back to T0.
Calculate the work done ON the gas. 1 atm
= 1.0×105 Pascals and 1 liter = 0.001 m3
.
Determine the concentration, to the nearest hundredth, phosphoric acid in a solution if there is 75.0 g of phosphoric acid dissolved in 60 mL of solution.
