Physics, 26.09.2019 20:10 stsfrost9328
Agirl is sledding down a slope that is inclined at 30º with respect to the horizontal. the wind is aiding the motion by providing a steady force of 161 n that is parallel to the motion of the sled. the combined mass of the girl and the sled is 87.7 kg, and the coefficient of kinetic friction between the snow and the runners of the sled is 0.151. how much time is required for the sled to travel down a 271-m slope, starting from rest?
Answers: 3
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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?
Answers: 2
Agirl is sledding down a slope that is inclined at 30º with respect to the horizontal. the wind is a...
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