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  1. 28 Hz and 4200 Hz -- find wavelengths in air, if speed is 340 m/s. (340 m/s)/(28 /s) = about 12 meters. (340 m/s)/(4200 /s) = about 0.081 m (or 8.1 cm )

    1 Answers · Science & Mathematics · 25/02/2021

  2. Your first error is in writing the radius as 0.0005 cm , when it is 0.05 mm = 0.005 cm . Maybe that was your only error!  Try again...

    2 Answers · Science & Mathematics · 25/02/2021

  3. You are given the following: r = 3x⁷y³ cm And: A = πr² To find the area in terms of...

    2 Answers · Science & Mathematics · 24/02/2021

  4. As I understood the question, yes, The diameter would be as you found.

    1 Answers · Science & Mathematics · 26/02/2021

  5. The room size is big enough to be irrelevant. A room that size can easily take the largest mainstream consumer TV sizes. The only facts which matter are the expected viewing distance and whether the buyer prefers large, “normal...

    1 Answers · Consumer Electronics · 27/02/2021

  6. (7.77 cm ^3) x (8860 kg/m^3) x (0.001 g/ cm ^3) / (1 kg/m^3) / (58.933195 g Co/mol) = 1.17 mol Co

    2 Answers · Science & Mathematics · 22/02/2021

  7. ... by multiplying by a number that is equal to one. 1000 cm ^3/ 1 L = 1 9 g Cu / (1 cm ^3 Cu) = 1 1 kg / 1000 g = 1...

    2 Answers · Science & Mathematics · 28/02/2021

  8. ...9e-6C/m² = 4.524e-6 C (assuming that by "r = 2- cm " you meant "r = 20 cm ") and on the inside we have Q₁i...

    1 Answers · Science & Mathematics · 20/02/2021

  9. Power is the rate of doing work and can be written as  P = Fv P = mgvcosθ  as only force in the direction of motion counts as work P = 0.0015(9.8)(0.02)cos25 P = 2.664...e-4 W ≈ 0.27 mW◄ Please remember to...

    2 Answers · Science & Mathematics · 27/02/2021

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