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1. ### 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

2. ### Need help pls: A truck starts from rest and for the first 4 seconds the acceleration..?

dv/dt => a = 6 - 2t so, v(t) = 6t - t² + v(0) Hence, v(t) = 6t - t² The maximum velocity occurs when a = 0 so, 6 - 2t = 0 i.e. when t = 3 Then, v(3) = 18 - 9 => 9 ms⁻¹ After 4 seconds we have: v(4) = 24 - 16 => 8 ms⁻¹ ds/dt...

1 Answers · Science & Mathematics · 28/05/2020

3. ### 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

4. ### A block is traveling in the x-axis. At t = 0 the block's velocity is v0x = 29.0 m/s . Consider that starting at time t = 0, the accelerati..?

Solution- At=0 , Vox=29.0 m/s ax=-Ct after t=8s, Vx=0m/s We know ax=dv/dt                  vx.        t             t               vx=0                   8 ==> ∫    dv= ∫ axdt=  ∫ -Ctdt= [v]             -C[t^2/2]        vox...

1 Answers · Science & Mathematics · 01/06/2020

5. ### PHYSICS AHHH HELP ME PLEASE!!??? 10 POINTS?

Depends on the experiment and equipment, but a) Waiting for at least 2 minutes to elapse from the start of the heat exchange is probably best. (c) and (d) are clearly wrong. Hope this helps!

1 Answers · Science & Mathematics · 01/06/2020

6. ### A small disk put down on a platform with diameter 0.520 m will rotate with the platform when its speed reaches to 41.0 rev/min , p?

... F = μₛmg.  So at the point when the disc would start to slide relative to the platform, the limiting frictional force equals the...

1 Answers · Science & Mathematics · 31/05/2020

7. ### Physics Help?

Looking at the units might help: field: volts per meter potential: volts distance: meters field E = potential / distance 3.0x10^6 V/m = PD / 0.00060m PD = 1800 V minimum Hope this helps!

1 Answers · Science & Mathematics · 13/05/2020

8. ### Zeno Paradox Question Plz Help!?

Achilles is faster by 9 m/s. He has to cover the 10 meter distance. So his time is 10 m / (9 m/s) = 1.111... seconds.

2 Answers · Science & Mathematics · 01/06/2020

9. ### Physics speed?

The mass of the child and sled have nothing to do with this problem. The assumption is that the kinetic energy at the bottom of the hill will equal the gravitational potential energy that was given up in the descent. So you have mgh = (1/2)mv^2 => v = sqrt(2gh), which is also known...

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