# Yahoo Web Search

1. Sort by

1. ### What is the difference between a start capacitor and a run capacitor ? and which is used on a generator ?

wikipedia Start capacitors briefly increase motor starting torque and allow....  so you can use electrolytic capacitors for the start cap, but not for a run cap. Generators don't use any...

3 Answers · Science & Mathematics · 27/10/2019

2. ### A ball of mass 522g starts from rest and slides down a frictionless track.?

Initial vertical velocity is zero, so  s = 1.25 m = ½gt² = ½ * 10m/s² * t² t = 0.500 s ◄ v = x / t = 1.00m / 0.500s = 2.00 m/s ◄ h = h0 + v² / 2g = 1.25m + (2.00m/s)² / 20m/s² = 1.45 m ◄ V = √(2gh) = √(2 * 10m/s²...

2 Answers · Science & Mathematics · 07/05/2020

3. ### Suppose a 5.00 kg box starts from rest and slides 2.55 m down a frictionless ramp. The ramp makes an angle of 30.0° with the horizontal.?

As no work goes into friction, the change in potential energy will equal the change in kinetic energy KE = PE = mgh = 5.00(9.81)(2.55sin30.0) = 62.53875‬ ≈ 62.5 J

2 Answers · Science & Mathematics · 07/04/2020

4. ### 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

5. ### An electron starts from rest 32.5 cm from a fixed point charge with Q = -8.50 nC. How fast will the electron be moving when it...?

The initial electric potential energy is U = kQq / d U = 8.99e9N·m²/C² * -8.50e-9C * -1.6e-19C / (0.325m) U = 3.76e-17 J and this gets converted into KE in the electron: KE = 3.76e-17 J...

1 Answers · Science & Mathematics · 09/02/2020

6. ### A 50N force acts on a 2kg crate that starts from rest. when the force has been acting for 2s what is the rate of doing work?​ please help!!?

From SUVAT: F = m×a and a = F/m = 50/2 = 25m/s^2 S = a/2 × t^2 = 25×2^2 = 100m Work = force × distance = 50N×100m = 5 kJ Power = work/time = 5 kJ/2s = 2.5 kW  Update if you need more, and please choose  a best answer...

1 Answers · Science & Mathematics · 02/02/2020

7. ### A child and sled with a combined mass of 49.6 kg slide down a frictionless hill that is 8.92 m high. If the sled starts from rest,?

Dylan forgot to cancel the m's mgh = 1/2 m v^2 gh = 1/2 v^2 v^2 = 2 g  h = 2(9.81)(8.92) = 175.01 v = 13.2 m/s When you get a good response, please consider giving a best answer. This is the only reward we get.

2 Answers · Science & Mathematics · 10/01/2020

8. ### Plz help...Francium decays with a half-life of 22 minutes. If we start out with 639 mg of francium, how much would remain after 2.7 hours?

2.7h = 2.7*60 min = 162min Number of half-lives = 162/22 = 7.364 Amount remaining = 639 * (1/2)^7.364 = 3.9mg

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

9. ### 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

10. ### Mary weighs 549 N and she walks down a flight of stairs to a level 3.2 m below her starting point. What is the change in Mary’s potential...?

Fd is work done (undone). (549)(3.2).= 1756.8 J It's a negative because potential is lost, so, -1756.8 J.  They probably want you to write out mgh, so mg, which is weight, times (hi - hf), which is change in height, or -3.2.

3 Answers · Science & Mathematics · 13/12/2019