Physics, 09.10.2019 00:00 lilakatedancer
Two friends are carrying a 200-kg crate up a flight of stairs. the crate is 1.25 m long and 0.500 m high, and its center of gravity is at its center. the stairs make a 45.0° angle with respect to the floor. the crate also is carried at a 45.0° angle, so that its bottom side is parallel to the slope of the stairs (fig. 2). if the force each person applies is vertical, what is the magnitude of each of these forces?
Answers: 1
Physics, 22.06.2019 08:50
You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?
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Physics, 22.06.2019 20:00
Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature
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Physics, 23.06.2019 00:40
Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.
Answers: 1
Two friends are carrying a 200-kg crate up a flight of stairs. the crate is 1.25 m long and 0.500 m...
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