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1. ### Not true,OR IS IT? YOU CAN start a fire by rubbing sticks together? No porky's now. ;-)?

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. ### To start an avalanche on a mountain slope, an artillery shell is fired with an initial velocity of 330 m/s at 52.0° above the horizontal.?

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. ### 30.8kg child start rest slides down wit vertical height of 16m 1Whats speed 1/2 down slide's vertical distance 2Whats child speed 3/4 down?

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. ### A 4.30 kg block starts from rest and slides down a frictionless incline, dropping a vertical distance of 2.50 m, before compressing?

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 we supply energy to an object we know that the particles start to move in different velocities.Does this effect change the centre of the?

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. ### Doing Optic : Lenses at school, didn't even start the topic and exams are in a week. Doing convex lenses, what is a refractive index? Thanks?

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. ### A dentist's drill starts from rest. After 3.90 s of constant angular acceleration it turns at a rate of 2.70 ✕ 104 rev/min.?

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. ### In a Broadway performance, an 84.5-kg actor swings from a R = 4.35-m-long cable that is horizontal when he starts. At the bottom of his arc?

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. ### A 786-N firefighter slides down the pole to the ground floor, 3.5 m below. Firefighter starts at rest and lands with a speed of 4.6 m/s?

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

10. ### In order to start a fire, a camper turns a lens toward the sun to focus its rays on a piece of wood. The lens has a 10 cm focal length.?

10cm behind the lens

1 Answers · Science & Mathematics · 19/05/2019