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1. ### vectors help?

...any vectors U, V.  That's not commutative--in a very specific way.  Change...quot;.     j x i = -(i x j) = -k     k x j = -(j x k) = -i...memorize them.  (I'm lousy at rote memorization, so ...

1 Answers · Science & Mathematics · 14/05/2020

2. ### rockets velocity?

...2 - 6.674e−11N·m²/kg²*5.98e24kg / (6371+950)e3m solves to v = 1421 m/s ≈ 1.4 km/s max height above surface k' = -5.35e7 J/kg = 0 + 6.674e−11N·m²/kg²*5.98e24kg / (6371...

1 Answers · Science & Mathematics · 12/05/2020

3. ### Physics - Waves?

...b) period T = 2π√(m/k) = 3.3 s so f = 1/T...at t = 0, I'd use a sin function: x(t) = 4.2m * sin...t we told this? 4.2 m f) done in (b) g...4.2m * sin(1.9*3) = -2.3 m v(3) = 4.2m * 1.9rad/s * cos(1...

1 Answers · Science & Mathematics · 28/04/2020

4. ### Chemistry question help!?

...0 - RT/nF ln Q Because the cell will have a positive potential, Q must be less than 1, and so must have the lower... concentration. Ecell = -(0.0592/2) log (0.5/1.2) = 0.0112 V

2 Answers · Science & Mathematics · 21/04/2020

5. ### Find the angular momentum and torque?

(a) L = r x mv where x represents the cross product L = (9.44, 0, -9.44) x 0.677*(-5.69, 0, 5.69) L = (0, 0, 0) or 0 i + 0 j + 0 k if you prefer (b) τ = r x F = (9.44, 0, -9.44) x (0, 7.10, 0) τ = (67.0...

1 Answers · Science & Mathematics · 17/04/2020

6. ### Physics Question?

...kz and x = z + 8 so mg = k(x - 8) k = mg / (x-8) m*g*23 = ½*[m*g/(x-8...35.7 m ← outside of acceptable range a) so L = 23m - x = 12.7 m b...g*14 = 9.8*14 = 137 v² = 274 v = 17 m/s c) k = mg / (x - 8) = m*9...

1 Answers · Science & Mathematics · 11/04/2020

7. ### The density of a gas is 1.48 g/L at a temperature of 24 ∘C and a pressure of 0.784 atm . Calculate the molar mass of the gas.?

...constant, R = 0.08206 L•atm/(mol•K) Molar mass, M = ? g/mol PV = nRT and n = m/M... = (m/M)RT M = (m/V)RT/P Since, d = m/V...

2 Answers · Science & Mathematics · 07/04/2020

8. ### Differential Equations Problem?

...from 240 = k/(-4)², you have the magnitude of k. Thus, F = mh'' = Fg... terms. Fg is a constant [which one?]. Note that h' = v, thus Fg + Fr = mv'. ...

1 Answers · Science & Mathematics · 28/02/2020

9. ### Physics Question?

A) just conservation of momentum 2.03kg * 1.30m/s = (2.03 + 1.83)kg * V V = 0.684 m/s √√√ agreed B) initial KE = ½ * 2.03kg * (1...

1 Answers · Science & Mathematics · 27/02/2020

10. ### Physics 2 question?

...from a charge Q at a distance r is ... = kQ/r, where k is the Coulomb...20 cm ≈ 4.47 cm, or 0.0447 m, or 4.47 × 10ˉ²... = 6.03 × 10² V, or 603 V. The...

2 Answers · Science & Mathematics · 07/02/2020