# physics test

Jun 17th, 2015
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2. An elevator 2.7 m tall from floor to ceiling and with mass 650 kg begins ascending with constant acceleration. 2.0 s later a bolt comes loose from the ceiling and falls, hitting the floor of the elevator after 0.69 s (the elevator is still accelerating upwards). What is the tension in the elevator cables?

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2. An elevator 2.7 m tall from floor to ceiling and with mass 650 kg begins ascending with constant acceleration. 2.0 s later a bolt comes loose from the ceiling and falls, hitting the floor of the elevator after 0.69 s (the elevator is still accelerating upwards). What is the tension in the elevator cables?3. In the diagram below, Block A rests on top of Block B (mB = 20 kg), which in turn rests on a ramp inclined at 30o. Block B is connected via a massless, frictionless rope and system of pulleys to Block C (mC = 200 kg). If Block C is released from rest and allowed to fall, what is the minimum mass mA such that Block A does not slip off the back of Block B as it accelerates up the ramp? The coefficient of static friction between Block A and Block B is s = 0.7 and the coefficient of kinetic friction between Block B and the ramp is k = 0.25.4. A wedge on wheels inclined at 30o with mass mW = 10 kg is placed with its tip 4.25 m from one wall and its back end is 2 m from the other wall. A mB = 4 kg ball is placed at rest on the top corner of the wedge, 1m above the ground (the diagram is not drawn to scale, you may ignore the height of the wheels as well as any rotational effects of the ball). What hits a wall first, the wedge or the ball? By how many seconds?5. On a particularly treacherous stretch of a mountain biking trail, the 7 m wide dirt trail forms

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