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BAED-PHYC2121 General Physics 1
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A truck moves 60 m east, then moves 110 m west, and finally moves east again a distance of 80 m. If east is chosen as the positive direction, what is the truck's resultant displacement?
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3.3 Adding Friction to the Mix
A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.16?0%
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2.2 What is Motion?
A 50-g ball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 20.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval?0%
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The ratio T/m of the prefixes M and m has what value?
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4.1 Statics
The coefficient of static friction between the tires of a car and the street is µs = 0.58. Of the following, what is the steepest inclination angle of a street on which a car can be parked (with wheels locked) without slipping?0%
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4.4 Further Applications of Newton's Laws
A 150-N sled is pulled up a 28° slope at a constant speed by a force of 120 N. What is the coefficient of kinetic friction between sled and slope?0%
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Two blocks of masses 22 kg and 9 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 9-kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.7 m/s2, what is the tension in the second string attached to the 8-kg mass?
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A ball of relatively low density is thrown upwards. Because of air resistance the acceleration while traveling upwards is −10.8 m/s2. On its trip downward the resistance is in the opposite direction, and the resulting acceleration is −8.8 m/s2. When the ball reaches the level from which it was thrown, how does its speed compare to that with which it was thrown?
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A boat moves through the water in a river at a speed of 8 m/s relative to the water. The boat makes a trip downstream and then makes a return trip upstream to the original starting place. Which trip takes longer?
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11.3 Harmonic Motion and Energy
A runaway railroad car, with mass 30 × 104 kg, coasts across a level track at 2.0 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 4.0 × 106 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)0%
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