Physics, 27.01.2022 07:30, staxeeyy767
A blue ball is thrown upward with an initial speed of 22.8 m/s, from a height of 0.7 meters above the ground. 2.8 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 9.9 m/s from a height of 29.5 meters above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s2.
1) What is the speed of the blue ball when it reaches its maximum height?
0
m/s
2) How long does it take the blue ball to reach its maximum height?
2.35
s
3) What is the maximum height the blue ball reaches?
27.22242
m
4) What is the height of the red ball 3.64 seconds after the blue ball is thrown?
17.7290323
m
5) How long after the blue ball is thrown are the two balls in the air at the same height?
4
s
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6) Which plot correctly shows the velocity of the two balls as a function of time? Three plots of velocity vs time for the red and blue balls
A
B
C
Answers: 2
Physics, 21.06.2019 23:30, hardwick744
Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.
Answers: 1
Physics, 22.06.2019 05:00, hihihi129473838
Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?
Answers: 3
A blue ball is thrown upward with an initial speed of 22.8 m/s, from a height of 0.7 meters above th...
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