course phy201 assignment #019019. `query 19
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17:34:14 Query class notes #20 Explain how we calculate the components of a vector given its magnitude and its angle with the positive x axis.
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RESPONSE --> multiply the cosine of the angle by the magnitude of the component confidence assessment: 1
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17:34:28 ** STUDENT RESPONSE: x component of the vector = magnitude * cos of the angle y component of the vector = magnitude * sin of the angle To get the magnitude and angle from components: angle = arctan( y component / x component ); if the x component is less than 0 than we add 180 deg to the solution To get the magnitude we take the `sqrt of ( x component^2 + y component^2) **
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RESPONSE --> self critique assessment: 1
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17:35:59 ** If one person pulls with the given force F in the given direction the effect is identical to what would happen if two people pulled, one in the x direction with force Fx and the other in the y direction with force Fy. **
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RESPONSE --> A person pulls with the given force in the given direction the effect is identical to what would happen if two people pulled, one in the x direction with force Fx and the other in the y direction with force Fy. self critique assessment: 2
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17:43:09 ** Using initial conditions and the equations of motion we can determine the x and y velocities vx and vy at a given point, using the usual procedures for projectiles. The magnitude of the velocity is sqrt(vx^2 + vy^2) and the angle with the pos x axis is arctan(vy / vx), plus 180 deg if x is negative. **
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RESPONSE --> By taking the square root of the velocity ""x"" squared plus the velocity ""y"" squared and the angle of position ""x"" is artan(vy/vx); you would add 180 degree if the ""x"" is negative. self critique assessment: 2
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17:44:50 ** Initial vel in the x direction is v cos(theta), where v and theta are the magnitude and the angle with respect to the positive x axis. Initial vel in the y direction is v sin(theta). **
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RESPONSE --> Initial vel in the x direction is v cos(theta), where v and theta are the magnitude and the angle with respect to the positive x axis and in the y-axis the velocity is v sin(theta) self critique assessment: 1
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