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    Circular motion question

    A tether ball of mass 0.5kg is attached to a vertical pole by a cord 1.5m long. Assume the cord attches to the centre of the ball. If the cord makes an angle of 20 degrees with the vertical, then: a) what is the tension in the cord? b) what is the speed of the ball? im having trouble with...
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    Friction, inclined slope

    hi peeps, can u guys help me with this question: A wheel weighing 40kg is rolling down a hill, inclined at 30 degrees. After reaching a speed of 5m/s, the wheel falls over on its side and begins sliding down the hill. 1. if the coefficient of friction for the sliding wheel is 1.00...
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    Projectile motion arrow question

    projectile motion question...plz help hi peeps, im reviewing the projectile motion stuff and for some reason im finding this question really tricky so can anyone take me through this question or at least give me a hand? The archer fish spits down a prey from overhanging foliage. If the...
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    Simple harmonic motion trouble

    hey guys im having trouble figuring out if something is undergoing simple harmonic motion. i know that for an object to be executing simple harmonic motion, its position and velocity must follow a sin curve...but im still having trouble. ok for example, a question on a worksheet said "a...
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    Confused about period of pendulum

    confused!! about period of pendulum hey guys, i have a question. "A meter stick oscillates back and forth about a pivot point at one of its ends. Is the period of a simple pendulum of length 1m greater than, less than or the same as the period of the meter stick?" i thought that the period...
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    Oscillations, energy conservation

    A 10g bullet embeds itself in a 0.5kg block which is attached to a spring of force constant 36N/m. If the maximum compression of the spring is 1.5cm, find a)the initial speed of the bullet and b)the time for the bullet-block system to come to rest. can someone give me some help with the above...
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    Conduction, 2 metal rods

    hey, can anyone help me with this question? im really having trouble with it. 1. Two metal rods, one lead the other copper, are connected in series (end-to-end). Note that each rod is 0.525m in length and has a square cross section 1.5cm on a side. The temperature at the lead end of the rods...
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    Young's modulus for aluminum

    "2 rods of equal length (0.45m) and diameter (1.5cm) are placed end to end. one rod is aluminium, the other is brass. if a compressive force of 8400N is applied to the rods, how much does their combined length decrease?" [ans: 0.55mm) with this question, im not sure whether its ok to find the...
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    Archimedes principle, bernoulli's equation

    thanks for the 1st question guys. im still having trouble with getting the right answer for the 3rd question because i found the weight of air displaced by the balloon but the problem is that even if I did add the mass of the balloon itself, my answer is still 5 fold smaller than the right...
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    Archimedes principle, bernoulli's equation

    hey can any1 help me with these 3 questions? 1. a piece of lead has a shape of a hockey puck with a diameter of 7.5cm and a height of 2.5cm. If the puck is placed in a mercury bath it floats. how deep below the surface of the mercury is the bottom of the lead puck? [2.1cm] (can anyone give...
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    Force and free fall

    Can anyone help me with any of these 3 questions? 1. Wrongly called for a foul, any angry basketball player throws the ball straight down to the floor. If the ball bounces straight up and returns to the floor 2.5s after first striking it, what was the ball's greatst height above the floor...
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