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Physics · Physics — University
Browse organized narrated video solutions. Each problem page includes the question, course, book, chapter, and related study links.
Video solutions
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Kinematics of Rectilinear Motion with Constant Acceleration
Physics · Physics — UniversityAn airplane starts from rest, travels 5000 ft down a runway, and after uniform acceleration takes off with a speed of 162 mi/h. It then climbs in a straight line with a uniform acceleration of 3 ft/s² until it reaches a …
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Piecewise Rocket Motion: a–t, v–t, and s–t Graphs
Physics · Physics — UniversityTwo rockets start from rest at the same elevation. Rocket A accelerates vertically at 20 m/s² for 12 s and then maintains a constant speed. Rocket B accelerates at 15 m/s² until reaching a constant speed of 150 m/s. Cons…
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Constructing v–t and a–t Graphs from a Given s–t Graph
Physics · Physics — UniversityA particle's position–time graph has been experimentally determined. From the data, construct the v–t and a–t graphs for the motion over $0 \le t \le 40$ s. For $0 \le t \le 30$ s, the curve is $s = 0.4t^2$ m, and then i…
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Two-Phase Motion: Acceleration Then Constant Speed
Physics · Physics — UniversityA freight train starts from rest and travels with a constant acceleration of $0.5$ ft/s². After a time $t'$ it maintains a constant speed so that when $t = 160$ s it has traveled $2000$ ft. Determine the time $t'$.
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Velocity–Altitude Equation for Freefall with Variable Gravity
Physics · Physics — UniversityAccounting for the variation of gravitational acceleration $a$ with respect to altitude $y$, derive an equation that relates the velocity of a freely falling particle to its altitude. Assume the particle is released from…
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Rectilinear Motion with Variable Acceleration
Physics · Physics — UniversityTwo particles A and B start from rest at the origin $s = 0$ and move along a straight line such that $a_A = (6t - 3)$ ft/s² and $a_B = (12t^2 - 8)$ ft/s², where $t$ is in seconds. Determine the distance between them when…
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Rectilinear Kinematics: Stopping Distance with Reaction Time
Physics · Physics — UniversityA normal driver has a reaction time of $t_r = 0.75\text{ s}$ before braking, while an impaired driver has a reaction time of $t_r = 3\text{ s}$. Both are traveling at $30\text{ mph}$ ($v_0 = 44\text{ ft/s}$) on a straigh…
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Average Velocity and Average Speed in Rectilinear Kinematics
Physics · Physics — UniversityA particle travels along a straight-line path such that in 4 s it moves from an initial position $s_A = -8$ m to a position $s_B = +3$ m. Then in another 5 s it moves from $s_B$ to $s_C = -6$ m. Determine the particle's …