My Math Forum Help Me Kin Assignment

 Physics Physics Forum

April 8th, 2018, 11:32 AM   #1
Newbie

Joined: Apr 2018

Posts: 9
Thanks: 0

Help Me Kin Assignment

I need help with question 3...I have no idea how to solve it..
Attached Images
 2018-04-07 (2).jpg (18.8 KB, 17 views)

 April 8th, 2018, 12:26 PM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 2,761 Thanks: 1416 projectile motion in 2 dimensions ... (a) $\Delta y = v_0 \sin{\theta_0} \cdot t - \dfrac{1}{2}gt^2$ $\Delta y = -35 \, m$, $v_0 = 120 \, m/s$, $\theta_0 = 30^\circ$ solve the resulting quadratic for $t$ (b) using $t$ found in part (a) ... $\Delta x = v_0 \cos{\theta_0} \cdot t$ (c) $v_{fx} = v_0 \cos{\theta_0}$ ... velocity in the $x$ direction remains constant using $t$ found in part (a) ... $v_{fy} = v_0 \sin{\theta_0} - gt$ $\theta_f = \arctan\left(\dfrac{v_{fy}}{v_{fx}}\right)$ Thanks from mayak201
 April 8th, 2018, 12:49 PM #3 Newbie   Joined: Apr 2018 From: Canada Posts: 9 Thanks: 0 3a) I got two answers as I used the quadratic formula, time cannot be negative so the answer I got is t=0.29s b) I got 5.36m so I rounded off to 5.4m c)-1.429 degrees = -1.43 degrees
 April 8th, 2018, 01:03 PM #4 Math Team   Joined: Jul 2011 From: Texas Posts: 2,761 Thanks: 1416 seems your calculator is in radian mode ... change to degrees Thanks from mayak201
 April 8th, 2018, 01:28 PM #5 Newbie   Joined: Apr 2018 From: Canada Posts: 9 Thanks: 0 OOpsss...thank u 3a)12.29s=12.3s b)1278.25m=1278.3m c)-0.58 degrees = -0.6 degrees Last edited by mayak201; April 8th, 2018 at 01:30 PM.
 April 8th, 2018, 01:33 PM #6 Math Team   Joined: Jul 2011 From: Texas Posts: 2,761 Thanks: 1416 $0 = 35 + 60t - 4.9t^2$ $a=-4.9$, $b=60$, $c = 35$ $\dfrac{-b - \sqrt{b^2-4ac}}{2a} \approx 12.8 \,sec$ (b) should be $\approx 1330 \, m$ (c) should be $\approx -32^\circ$ Thanks from mayak201

 Tags assignment, kin

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post illidan5 Number Theory 5 March 24th, 2016 04:31 AM LMW Algebra 1 November 20th, 2012 02:46 PM ron Calculus 1 October 8th, 2011 09:36 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top