Asystem releases 680 kj of heat and does 150 kj of work on the surroundings. what is the change in internal energy of the system?

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?