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  1. Both kinematics and conservation of energy lead to an impact speed of v = √(2gh) = √(2g*2r) = √(2*9.8m/s²*2*0.1300m) = 2.257 m/s conserve momentum: 8.70kg * 2.257m/s = 8.70kg * -0.4332 * 2.257m/s + 13.200kg*V where V is the speed of the block after the collision. V = 0.8433 m/s Hope this...

    1 Answers · Science & Mathematics · 09/11/2020

  2. ...2*1.2m = 149 m²/s² → v = 12 m/s b) T = m*(v²/ r ± g) at bottom, T = 1.3kg * (14²/1.2 + 9.8)m/s² = 225 ...

    2 Answers · Science & Mathematics · 18/11/2020

  3. ...210 rad = -2.65 rad = -152º using the usual convention magnitude v = ω r = 42rad/s * 47m = 1974 m/s (units of "meters" assumed...

    2 Answers · Science & Mathematics · 05/11/2020

  4. ...force of tension acts tangent to the pulley and thus the angle between T and R is 90 degrees and the sin(90) is one. =>T x 0.8...

    1 Answers · Science & Mathematics · 05/11/2020

  5. ...2 = 40 voltsthat means V2 = 180–40 = 140 voltsVoltage across R is 300–140 = 160 vcurrent thru R4 = 140/30 = 4.667 amps current...

    1 Answers · Science & Mathematics · 06/11/2020

  6. ...same, then a³ = (4π/3)r³ where a is the cube side length and r is the sphere's radius a = 1.612r area of the sphere is 4π...

    1 Answers · Science & Mathematics · 03/11/2020

  7. log 9.3 is 0.91907809237607390383276035202726 log 10.5 is 1.0211892990699380727935052671233 Take the difference

    2 Answers · Science & Mathematics · 03/11/2020

  8. No. I expect that table has (or should have) R /10^3. It means that the R value, divided by 1000 ohms, is 9.4. Therefore, R = 9400 ohms.

    1 Answers · Science & Mathematics · 03/11/2020

  9. mg tanθ = mv²/ r v²= r /m * mg tanθ, but mass cancels v = √(rg tanθ) v = √140*9.80665 * 0.3249 = 21.1m/s  ((76.0 kph)) Your answer is correct except for missing units.

    2 Answers · Science & Mathematics · 31/10/2020

  10. ...h = 8.358 x10^6 m Gravitational potential energy U = GMm/ r -->  set r = a, m = 109 kg and M = 5.972 x 10^24 kg U = 5.195x10...

    1 Answers · Science & Mathematics · 31/10/2020

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