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  1. It's a skill that can be developed to start a fire, yes. The act of rubbing (usually by rotating a ...

    11 Answers · Science & Mathematics · 08/12/2018

  2. The first step is to determine the x and y components of its initial velocity. x = 330 * cos 52 ≈ 203 m/s y = 330 * sin 52 ≈ 260 m/s During the 37.0 seconds, the horizontal component of the initial velocity is constant. Final x position = 330 * cos 52 * 37.0...

    2 Answers · Science & Mathematics · 13/02/2019

  3. Since there is no friction, and we only know the vertical distance, the child’s vertical acceleration is 9.8 m/s^2. In this problem, the vertical distance is 8meters. Let’s use the following equation to determine the child’s speed. vf^2 = vi^2 + 2 * a * d, vi = 0 vf^2 = 2 * 9.8 * 8 vf...

    2 Answers · Science & Mathematics · 09/06/2019

  4. The gravitational potential energy will be converted to spring potential energy. We don't know the ramp slope and the spring constant is probably large enough that the gravity potential released while the spring is compressed is negligable mgh = ...

    1 Answers · Science & Mathematics · 20/02/2019

  5. If you mean heat energy, then no. Molecules move in all directions so their motion averages out. The center of mass does not change.

    2 Answers · Science & Mathematics · 09/05/2019

  6. Refractive index is the ratio of how fast light travels through a medium (eg glass) to how fast it travels through a vacuum. eg...if glass has a refractive index of 1.5 then it travels 1.5 times faster through a vacuum than through glass.

    3 Answers · Science & Mathematics · 08/06/2019

  7. ω = 27,000 rev/min * 1min/60s * 2πrad/rev = 2827.433rad/s = α*t α = 2827.433/3.9 = 725rad/s² Θ = ½αt² = ½*725*3.9² = 5514rad or 5510 radians to 3 s.f.,

    2 Answers · Science & Mathematics · 11/05/2019

  8. Just prior to collision, v = √(2gh) = √(2 * 9.8m/s² * 4.35m) = 9.23 m/s conserve momentum during the collision: 84.5kg * 9.23m/s + 55.0kg * 0m/s = (84.5 + 55.0)kg * V and so the post-collision momentum is V = 5.59 m/s H = V² / 2g = (5.59m/s)² / 19.6m/s² = 1.60 m If...

    1 Answers · Science & Mathematics · 15/05/2019

  9. If there is no friction, the firefighter’s kinetic energy at the bottom of the slide would be equal to the firefighter’s initial potential energy. PE = 786 * 3.5 = 2,751 J Mass = 786 ÷ 9.8 This is approximately 80.2 kg. Let’s determine the actual kinetic energy at the bottom of...

    1 Answers · Science & Mathematics · 13/02/2019

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