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Unformatted text preview: = 0 . 3 determine the speed at which each crate slides oﬀ the ramp at B. Assume that no tipping occurs ( θ = 30 ◦ , a = 3 m, g = 9 . 81 m/s 2 ). 3. The motor pulls on the cable at A with a force F = 150 + 5 t 2 N. If the crate of weight W = 85 N is originally at rest at t = 0, determine its speed at time t = 4 s. Neglect the mass of the cable and pulleys. Hint: First ﬁnd the time needed to begin lifting the crate. 4. The boy B jumps oﬀ the canoe at A with a velocity v BA = 5 m/s relative to the canoe as shown. If he lands in the second canoe C, determine the ﬁnal speed of both canoes after the motion. Each canoe has a mass M C = 40 kg. The boy’s mass is M B = 30 kg, and the girl D has a mass M D = 25 kg. Both canoes are originally at rest ( θ = 30 ◦ ). 1 Figure 1: Question 1 Figure 2: Question 2 Figure 3: Question 3 Figure 4: Question 4 2...
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- Spring '11
- Mechanical Engineering