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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 .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

3. ### A child decides to use his toy gun to launch a 3 gram pebble vertically into the air. If the spring inside (k= 600 N/m) is compressed...?

During the time that the pebble is being launched, there are two forces on the pebble. The force exerted by the toy gun is the upward force. Its weight is the downward force. Let’s determine the work that is done...

2 Answers · Science & Mathematics · 28/01/2019

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. ### 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

6. ### A power plant burns coal at 830 K, and exhausts to air at 288 K. if it runs at the carnot effuciency,?

Efficiency = 66.3% If it does 230 kJ of work, total energy = 347 kJ. Heat exhausted to atmosphere is the difference or 117 kJ

0 Answers · Science & Mathematics · 29/01/2019

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. ### Help me with physics please..?

Kinetic energy K = ½mv² = ½*1.24*0.542² = 0.18213 J...energy. ½k(x_max)² = Etot x_max = √[2*Etot /k] = √[2*0.84345/9.82] = 0.414m __________________ b.) What is the maximum...

1 Answers · Science & Mathematics · 08/02/2019

9. ### physics problem, help please?

F = k x but the force is provided by buoyancy. So you need to find... by simplifying the fractions ) Now x = F/k ( from the first line) = 9.8 * 2 * 4.17 / 3 / 166 = 0.164 m and you should be...

1 Answers · Science & Mathematics · 15/02/2019

10. ### Physics homework. Help is greatly appreciated?

F = k * C * C / r^2 https://en.wikipedia.org/wiki/Coulomb...

2 Answers · Science & Mathematics · 14/02/2019