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Unformatted text preview: 9May06 LeClair Name: PH 1053 Final Exam Part 1: Multiple choice (65%) Answer all questions. 1. Stephan’s law relating the (thermal) radiation power to the temperature of the radiating body is expressed as: P = σAT 4 , where P is power in Watts (W), T is temperature in Kelvins, and A is an area in m 2 . What are the units of σ ? W/ ( m 2 · K 4 ) W/K 4 W · m 2 /K 4 K 4 / ( W · m 2 ) 2. A particle’s velocity is given by: v ( t ) = mg b 1 e b m t where b is a constant (units of kg/sec ), and the particles mass is m . Find the acceleration at t = 0. gb/m 2 g/b g g/b 3. A projectile is launched at an initial angle of 75 ◦ over level ground, and lands at a distance d away. Neglecting air resistance, at what other launch angle ( < 90 ◦ ) would the projectile have landed at the same distance d ? 5 ◦ 35 ◦ 25 ◦ 15 ◦ 4. A projectile is launched at an initial angle of θ over level ground, and at the same time, a second projectile is dropped from a height h a distance x away from the launch site. Neglecting air resistance, what is the required height h for a given x and θ such that the two projectiles collide? not enough information 1 h = x/ tan θ h = x tan θ h = x sin θ 5. In which of the pictures below does the scale read the largest value? a b a and b are the same, and both more than c c 6. A hockey puck on a frozen pond is given an initial speed of 20.0 m/s. The puck always remains on the ice and slides 115m before coming to rest. Determine the coefficient of kinetic friction between the puck and the ice. 0.177 0.117 0.255 0.010 2 7. A rubber ball is swung in an updown circular arc as shown below. At the top of the arc, the string breaks. In what direction does the bucket fly immediately after? ← → ↑ ↓ 8. An object of mass m is attached to a spring hung vertically from the ceiling. After attaching the mass m , the spring stretches a distance d from its former equilibrium. If m = 0 . 55 kg and d = 2 cm, what is the force constant of the spring? 375 N/m 1750 N/m 2700 N/m 2.7x10 4 N/m 9. You are traveling along a freeway at 65 mi/h. Your car has a certain kinetic energy. You suddenly skid to a stop because of congestion in traffic. Where is the kinetic energy your car once had? All of it is in internal energy in the road. All of it is in internal energy in the tires. Some is transformed to internal energy, and some is carried away by mechanical waves. All of it is transferred away from the car by various mechanisms. 10. A block having a mass of 0 . 80 kg is given an initial velocity of v A = 1 . 2 m/s to the right and collides with a spring of negligible mass and force constant k = 50 N/m, as shown below. Assuming the surface to be frictionless, what is the maximum compression of the spring after the collision?...
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 Spring '08
 sawyer
 Physics, Force, Friction, Mass, Archimedes

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