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question:A 10-gram point mass is attached to a string and is traveling in a circle at 2 revolutions per second (rps) at a distance of 10 cm from the center of rotation. Now, consider the rotating mass to be a sphere with a moment of inertia I = (2/5)MR^2, where M is the mass of the sphere, R is its radius, and the radius of the sphere is 0.5 cm. The mass is still 10 grams, and it is still traveling in a circle with a radius of 10 cm. Additionally, the small mass is rotating around its center at 10 rps. What is the total kinetic energy of the system now?
answer:** To calculate the total kinetic energy of the system, we need to consider both the translational kinetic energy and the rotational kinetic energy. The translational kinetic energy is given by: {eq}rm KE_{trans} = frac{1}{2}mv^2 {/eq} where m is the mass of the sphere and v is its linear velocity. The rotational kinetic energy is given by: {eq}rm KE_{rot} = frac{1}{2}Iomega^2 {/eq} where I is the moment of inertia of the sphere and omega is its angular velocity. The total kinetic energy of the system is then: {eq}rm KE_{total} = KE_{trans} + KE_{rot} {/eq} Plugging in the given values, we get: {eq}rm KE_{trans} = frac{1}{2}(0.01 kg)(2pi times 0.1 m times 2 rps)^2 = 0.008 J {/eq} {eq}rm KE_{rot} = frac{1}{2}left(frac{2}{5}(0.01 kg)(0.005 m)^2right)(10 rps)^2 = 0.0001 J {/eq} {eq}rm KE_{total} = 0.008 J + 0.0001 J = 0.0081 J {/eq} Therefore, the total kinetic energy of the system is 8.1 mJ.
question:Find the divergence of the vector field mathbf{F}(x, y, z) = f(x, y, z)uvec{i} + g(x, y, z)uvec{j} + h(x, y, z)uvec{k}, where f(x, y, z) = sqrt[3]{y-z}, g(x, y, z) = arctanhleft(frac{y}{z}right), and h(x, y, z) = ln(z).
answer:The divergence of a vector field mathbf{F}(x, y, z) = f(x, y, z)uvec{i} + g(x, y, z)uvec{j} + h(x, y, z)uvec{k} is given by nabla cdot mathbf{F} = frac{partial f}{partial x} + frac{partial g}{partial y} + frac{partial h}{partial z}. Let's compute the partial derivatives: 1. frac{partial f}{partial x} = 0 since f does not depend on x. 2. frac{partial g}{partial y} = frac{1}{z left(1 - frac{y^2}{z^2}right)} from the derivative of arctanh. 3. frac{partial h}{partial z} = frac{1}{z} from the derivative of ln. Now, we sum these partial derivatives to find the divergence: nabla cdot mathbf{F} = 0 + frac{1}{z left(1 - frac{y^2}{z^2}right)} + frac{1}{z} Simplifying, we obtain: nabla cdot mathbf{F} = frac{1}{z left(1 - frac{y^2}{z^2}right)} + frac{1}{z} This result is correct, as it shows the sum of the rates of change of each component with respect to the corresponding coordinate.
question:Find the first-order Taylor series expansion of the inverse function for f(x) = -27x^3 around x = 5.
answer:The first step is to find the derivative of f(x): f'(x) = -81x^2 At x = 5, we have: f'(5) = -81 cdot 5^2 = -2025 The function value at x = 5 is: f(5) = -27 cdot 5^3 = -3375 The inverse function's series is given by: f^{-1}(x) = a + frac{f'(a)}{f''(a)}(x - f(a)) Using x = -3375 and a = 5, we find the coefficient a in the first-order expansion: a = f^{-1}(f(a)) = f^{-1}(-3375) However, since we don't know f^{-1}(x) explicitly, we can express a as: a = -frac{f(a)}{f'(a)} = frac{-3375}{-2025} = 5 Now, the first-order series of the inverse function is: f^{-1}(x) = 5 + frac{1}{-2025}(x - (-3375)) f^{-1}(x) = 5 - frac{1}{2025}(x + 3375) f^{-1}(x) = frac{3375 - x}{2025} - 5 Thus, the first-order series of the inverse function around x = 5 is: frac{3375 - x}{2025} - 5
question:What is the relationship between my sister's sister and me?
answer:In the given sentence, "La hermana de mi hermana es mi _______________," the subject is "La hermana de mi hermana" (my sister's sister), and the verb is "es" (is). The missing word after "es" is a noun that describes the relationship between my sister's sister and me. Since my sister's sister is my sibling, the correct word to fill in the blank is "hermana" (sister). Therefore, the complete sentence is "La hermana de mi hermana es mi hermana" (My sister's sister is my sister). My sister's sister is my sister.