Physics, 30.04.2021 14:00 hihihi129473838
A small cart weighing 3 kg, pushed by a spring with a coefficient of elasticity of 2.2 × 10⁴ N / m and compressed by 6 cm. Calculate the speed gained by the cart and the path it travels in a horizontal plane knowing that the friction force is 1.5 N
Answers: 2
Physics, 22.06.2019 08:00
Who was the first scientist to measure speed as distance over time?
Answers: 1
Physics, 22.06.2019 19:40
22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?
Answers: 1
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?
Answers: 2
A small cart weighing 3 kg, pushed by a spring with a coefficient of elasticity of 2.2 × 10⁴ N / m a...
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