Skip to main content
\(\require{cancel}\)
Physics LibreTexts

2.5: Selected Answers

  • Page ID
    45953
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)

    1 r2 = 1.4 m

    2 t2 = 1.45 m

    3 t3 = 3.4 s

    4 t3 = 4.55 s

    5 r3 = 36.6 m

    6 r3 = 3520 m

    7 r2 = 14.9 m

    8 r4 = 2000 m

    9 t4 = 3.7 x 105 s

    10 t2 = 14.9 s

    11 t2 = 7.8 s

    12 t3 = 15.7 s

    13 t3 = 2.87 s

    14 F rope = 420 N

    15 F cushion = 1910 N

    16 a ≥ 4.49 m/s2

    17 t2 = 17.1 s to reach ground

    18 F cushion = 2830 N

    19 F ground = 43700 N

    20 r3 = 63.5 m

    21 r3 = 1550 m

    22 m block = 240 kg

    23 m block = 26 kg

    24 F rope = 500 N

    25 F rope = 466 N

    26 a. F scale = 755 N b. F scale = 780 N

    27 a. v = 17.5 m/s b. t = 17.1 s

    28 a. v = 116 m/s b. t = 26.8 s

    29 a. v = 12.5 m/s b. F ground = 43700 N

    30 t2 = 0.89 s r2 = 1.78 m

    31 m student = 94 kg

    32 v2 = 6.0 m/s

    33 Student falls 5.0 m in 3.03 s

    34 v2 = 1.5 m/s

    35 v1 slowship = 0.029c = 8.73 x 106 m/s

    36 v2 fastship = 0.052c = 1.56 x 107 m/s

    37 v2 ship = 24.3 m/s

    38 v probe = 667 m/s

    39 v2 platform = 0.28 m/s

    40 v2 platform = 0.025 m/s

    41 v2 balloon = 6.3 m/s


    2.5: Selected Answers is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Paul D'Alessandris via source content that was edited to conform to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.