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1. ### It takes 400J of work to stretch a 0.2kg rubber band. When released , how fast will the rubber band be moving?

If ALL of the spring energy becomes KE, then 400 J = ½mv² = ½ * 0.2kg * v² → → v = 63 m/s That's a high speed, but it's also a lot of work for a rubber band.

1 Answers · Science & Mathematics · 25/03/2021

2. ### You throw a rock up in the air at a speed of 5.0 m/s. How high will it go from the point at which it is released ?

KE becomes PE means that ½mv² = mgh. Rearrange to h = v² / 2g Plug in v and g.

1 Answers · Science & Mathematics · 26/03/2021

3. ### The third time I am posting this because I am suffering due to this sum. I solved it in a way and different methods have different answers?

...from the ramp base is R = 7.16 + 1.31 = 8.47 m if fired and released at the same instant. Telling us that the block starts from 10 m...

1 Answers · Science & Mathematics · 09/04/2021

4. ### State Bohr’s postulate about the frequency f of light emitted when an electron makes a transition from a state of energy Ei to one of Ef??

E = hf where h is a constant called Planck's Constant.  E is the energy released in the transition = Ei - Ef and f is the frequency of the emitted photon.

1 Answers · Science & Mathematics · 04/04/2021

5. ### A 1050kg car moving east at 5m/s collides with a 2100kg car moving east at 2m/s. After the collision, the 2100kg car moves east at 6m/s.?

...) = 42,525 J So a huge amount of internal energy was released in this collision.  Where did that energy come from? No solid ...

1 Answers · Science & Mathematics · 22/03/2021

6. ### Physics velocity formula multiple choice question?

... = v - w  .... where w is the final velocity of right block just after spring release 3v/2 = v - w w = v + 3v/2 w = 5v/2 The right block will have velocity of 5v...

1 Answers · Science & Mathematics · 26/03/2021

7. ### Physics: Energy in SHM?

(a) EPE = ½kx² = ½ * 434N/m * (0.375m)² = 30.5 J (b) KE = 30.5 J = ½mv² = ½ * 0.316kg * V² → → V = 13.9 m/s

2 Answers · Science & Mathematics · 17/03/2021

8. ### Mechanics- forces in two dimensions ?

a) for an object on a frictionless incline, the acceleration is a = g*sinΘ = 9.8m/s² * sin12º = 2 m/s² Then using s = ½at² we get t = √(2s / a) = √(2 * 6m / 2m/s²) = 2.4 s b) Now the acceleration is a = g*sinΘ...

2 Answers · Science & Mathematics · 25/03/2021

9. ### In a free-fall experiment, an object is dropped from a height of h = 576 feet. A camera on the ground 500 ft...?

(a) Since you have a nice "round" number like 576 ft, I think you want to use a nice "round" number for g. Then h(t) = h₀ + v₀*t + ½at² = 576ft + 0*t - ½*32ft/s²*t² h(t) = 576 - 16t² ◄ for...

3 Answers · Science & Mathematics · 04/04/2021

10. ### Electric charge question physics?

initial separation is d = √(1.25² + 0.570²) m = 1.374 m initial energy is E = kQq / d = 8.99e9N·m²/C² * 2.72e-6C * 3.30e-6C / 1.374m E = 0.05874 J At "half the speed it will have at infinity," the KE...

1 Answers · Science & Mathematics · 18/03/2021