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1. ### A plane is flying with a bearing of 302°. Its speed with respect to the air is 900 kilometers per hour. ?

I'm assuming that the "bearing of 302 degrees" is measured clockwise from north.  The components of this 900 km/h velocity are 763.24 km/h westward and 476.93 km/h northward. The components of the wind velocity...

1 Answers · Science & Mathematics · 23/01/2021

The position vector r traces out an ellipse with semi-major axis a and semi-minor axis b. The parametric equation for r(t) is given. By differentiating r with respect to time you find the velocity vector. A second differentiation gives the acceleration...

2 Answers · Science & Mathematics · 24/01/2021

3. ### Physics: Calculating Torque?

What makes this question seem very silly is that nobody would pull on the wrench in that direction.  He would pull on it in a direction perpendicular to the wrench.  Oh, but then the physics problem would be too easy, right? OK, so let's say some nincompoop actually does pull on...

3 Answers · Science & Mathematics · 23/01/2021

4. ### Water at room temperature flows with a constant speed of 8.00 m/s through a nozzle...what is the acceleration of the fluid at the exit?

(a) volume flow rate everywhere is Q = vA = 8.00m/s * (0.500m)² = 2.00 m³/s (b) The velocity at the exit is V = Q/A' = 2.00m³/s / (0.200m)² = 50.0 m/s V² = v² + 2ad (50.0m/s)² = (2.00m/s)² + 2*a*2.00m...

1 Answers · Science & Mathematics · 21/01/2021

5. ### Fluids Trick Physics Question!?

Bernoulli: p₀ + ρgh₀ + ½ρv₀² = p₁ + ρgh₁ + ½ρv₁² h terms cancel on the level table. If the velocity under the paper (v₀) is GREATER THAN the velocity over the...

1 Answers · Science & Mathematics · 21/01/2021

6. ### Physics: Kinematic Equations for Rotational Motion?

(a) ω² = ω₀² + 2αΘ 0² = (19.7rad/s)² + 2*α*3.86 rad α = -50.3 rad/s² (b) t = Δω / α = (0 - 19.7)rad/s / -50.3rad/s² = 0.392 s

1 Answers · Science & Mathematics · 20/01/2021

7. ### The unspecified currents in ( Figure 1) are IA = 2 A and ID = 3 A. The directions of the currents are as noted.?

sum of currents into a node have to add to zero 7 – Ia – Ic = 0 Ic + Id – Ib = 9 Ia = 2 A and Id = 3 A 7 – 2 – Ic = 0Ic + 3 – Ib = 9 Ic = 5 amp 5 + 3 – Ib = 9 Ib = 5 + 3 – 9 = –1 amp

1 Answers · Science & Mathematics · 18/01/2021

8. ### Is this an equilibrium position for the board? If yes, is it in stable or unstable equilibrium?

It looks to me like a stable equilibrium. If initially centered on the rollers, it should remain centered. If slightly perturbed, the normal (and therefore friction) force on the "long" side of the board will increase producing a...

2 Answers · Science & Mathematics · 18/01/2021

9. ### Which one is correct??

...you can do a rotation without also doing a translation. To rotate the bottom figure , you would rotate it about its center of axis - but that would not align it with the...

5 Answers · Science & Mathematics · 17/01/2021

10. ### Physics help please!! ?

specific heat capacity of coffee cc = cw = 4.186 joule/(g*°C)  4.186(mc*80+(250-mc)*10) = 4.186*60*(mc+250-mc)  4.186 cancels 70mc+2500 = 60*250 mass of coffee mc = (60*250-2500)/70 = 179 grams mass of water mw = 250-179 = 71 grams

2 Answers · Science & Mathematics · 15/01/2021