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Physics, 27.09.2019 04:30 Yungnaudie
The intensity level of a "super-silent" power lawn mower at a distance of 1.0 m is 100 db. you wake up one morning to find that four of your neighbors are all mowing their lawns using identical "super-silent" mowers. when they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? you can neglect any absorption, reflection, or interference of the sound. the lowest detectable intensity is 1.0 × 10-12 w/m2.
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Physics, 22.06.2019 14:30
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Physics, 22.06.2019 20:20
The base of a 50-meter tower is at the origin; the base of a 50-meter tree is at (0, 50, 0). the ground is flat and the z-axis points upward. the following parametric equations describe the motion of six projectiles each launched at time t = 0 in seconds. (i) r (t) = (50 + t2)k (ii) r (t) = 2t2 j + 2t2k (iii) r (t) = 50 i + 50 j + (50 − t2)k (iv) r (t) = 2t j + (50 − t2)k (v) r (t) = (50 − 2t) i + 2t j + (50 − t)k (vi) r (t) = t i + t j + tk (a) which projectile is launched from the top of the tower and goes downward? at time t = , the projectile hits the ground at point (x, y, z) = . (b) which projectile hits the top of the tree?
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The intensity level of a "super-silent" power lawn mower at a distance of 1.0 m is 100 db. you wake...
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