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Spring 2006

# Spring 2006 - Scott Pratt PHY231 Spring 2006 Introduct...

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Scott Pratt - PHY231, Spring 2006 - Introduct 1 Midterm 1 (lecture students) 2 pt From dimensional analysis considerations alone, mark these formulas as either ’valid’ or ’invalid’. Assume that x has dimensions of distance, v has dimensions of velocity, t has dimensions of time, g has dimensions of acceleration and m has dimensions of mass. . v/x = 7 g/v 1 . A valid B invalid . m ( x + vt ) / (1 + gt/v ) = mgt 2 / 2 2 . A valid B invalid 4 pt Consider a projectile which strikes a target as shown below. Ignore all forces except gravity. Point A refers to a point just beyond the muzzle of the cannon, B refers to the highest point in the trajectory and C refers to a point just before landing on the cliff. . The vertical component of the velocity at B is zero. 3 . A greater than B less than C equal to . The acceleration at A is the acceleration at C . 4 . A greater than B less than C equal to . The horizontal component of the velocity at A is than the horizontal component of the velocity at B . 5 . A greater than B less than C equal to . The magnitude of the vertical component of the velocity at A is the magnitude of the vertical component of the velocity at C 6 . A greater than B less than C equal to 4 pt A cannonball is fired directly upward with an initial velocity of 90 m/s and lands on the cannon after a time T. For the following statements, displacements and times are measured relative to the point at which the cannonball left the muzzle, and the upward direction is positive. Choose the best answer. . For times t between 0 and T, the displacement of the can- nonball was . 7 . A positive B negative C zero D positive, negative and zero at different times . At the highest point in the trajectory, the velocity of the cannonball was . 8 . A positive B negative C zero D positive, negative and zero at different times . For times t between 0 and T, the velocity of the cannonball was .

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Spring 2006 - Scott Pratt PHY231 Spring 2006 Introduct...

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