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Two 1 kg balls collide elastically in 2D. Ball 1 moves south at 1.5 m/s, and Ball 2 moves east at 2 m/s. What is the total momentum, in kg*m/s, in the x-direction (east-west) after the collision?

A negatively charged particle moves from the top when it enters a region with two charged plates as shown.  Which of the diagrams shows its path after it enters between the plates?  Explain in your work.

Photosynthesis first evolved in: 

All organisms that belong to Domain Archaea: 

Which of the following statements about algae is correct?

Which newborn exam finding would warrant further investigation?

An on-off neuron with an excitatory center-inhibitory surround receptive field will respond most when we stimulate…

According to the textbook, “Perceiving machines” (computers) that can successfully perceive the environment 

Which of the following is an example of a Secondary defense of the body?

John wants to see if the kids in his AP classes have a higher IQ after studying for the IQ test with some new lessons he designed.  He takes a sample of 6 students prior to the study material and find the following IQ’s: 98, 105, 103, 110, 106. After the lessons are concluded he retests the students and find the following IQ’s (respectively): 100, 106, 102, 114, 108 At the 10% significance level, is there evidence that the lessons raised scores on the IQ test?   Q1: This is a [twosample] [means] Q2: What distribution will you use? [t] Q3: What is the conclusion? [conclusion] meaning [conclusion2] Q4: If the truth is that the program raises scores on the IQ test, what error was made? [error]