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1. ### a spring with k=33.5 n/m has 1.2kg mass attached it is pulled .12m and released how much mechanical energy does it have?

Assuming the system has no friction, it's a simple harmonic oscillator and therefore has constant mechanical energy. When the spring is fully stretched, all of that mechanical energy is spring potential E = PS E = ½kA²...

2 Answers · Science & Mathematics · 28/05/2019

2. ### A spring w k= 4500 is compressed to 2.1 m, used to launch a 48 kg rock. the rock gets launched straight up. How high does it go?

When compressed, stored energy = ½kx² = ½(4500)(2.1)² = 9922.5 J When rock projected above energy will be given to the rock as kinetic energy. ie Kinetic energy of rock = 9922.5 J If it...

3 Answers · Science & Mathematics · 25/11/2019

3. ### a .15kg is attached to a spring with k=18.9 n/m at the equilibrium position it moves 2.39 m/s how mechanical energy does it have?

At equilibrium position, there is no spring potential energy. E = 0.5mv^2 = 0.5*0.15*2.39^2 = 0.428 J

2 Answers · Science & Mathematics · 28/05/2019

4. ### a kid moving 3.18 m/s jumps on a slip &amp; slide (μk=0.0751) how far has he slid when his velocity is reduced to 2.00 m/s?

work done by friction = loss of KE µmgd = ½m(V² - v²) mass m cancels 0.0751 * 9.8m/s² * d = ½ * (3.18² - 2.00²)m²/s² solves to d = 4.15 m ◄ Hope this helps...

1 Answers · Science & Mathematics · 02/07/2019

5. ### What resistance should you place in parallel with a 56-kΩ resistor to make an equivalent resistance of 38 kΩ?

1/R= 1/r1 +1/r2 ie., 1/38= 1/56+ 1/r2 Solving you get r2 = 118 kilo ohm.

1 Answers · Science & Mathematics · 05/02/2020

6. ### force of attraction b/w two particles is f=k*[(r2-r1)-r/v(r2-r1)] where k is constant, vis velocity, and r= r2-r1, is system conservative?

Yes. r, r1 and r2 do not depend on time explicitly. Therefore the motion is conservative.

2 Answers · Science & Mathematics · 23/02/2019

7. ### A ball is thrown eastward into the air from the origin (in the direction of the positive x-axis). The initial velocity is 40 i + 64 k,?

u = <40, 0, 64> (initial velocity) a = <0, -8, -32> (you have a typing mistake) v(t) = <40 + 0*t, 0 + (-8)t, 64 + (-32)t> . . . .= <40, -8t, 64 – 32t> (agreed) Remember displacement (s) in a given direction is...

1 Answers · Science & Mathematics · 07/09/2019

8. ### Physics electrostatic question?

k Q^2 / d^2 = m g Q = sqrt( m g d^2 / k)

1 Answers · Science & Mathematics · 01/05/2019