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Q: 3.7 meters 0 meters 22.7 meters 125 meters Question #3MultipleChoice Score: A rock is rolling down a hill. At position 1, its velocity is 2.0 m/s. Twelve seconds later, as it passes position 2, its
velocity is 44.0 m/s. What is the acceleration of the rock? 42.0 m/s23.7 m/s23.8 m/s23.5 m/s2 Question #4MultipleChoice Score: Use the Pythagorean theorem to answer this question. Becca paddles a boat from the south bank of a stream to the north bank. She paddles at a rate of 8 mph. The stream is flowing west at a rate of 6 mph. What is Becca's actual velocity? 14 mph14 mph, northwest100 mph, northwest10 mph, northwest Question #5MultipleChoice Score: Robby skateboards 0.50 blocks to his friend's house in 1.2 minutes. What is his speed? 6.0 blocks/min6.0 blocks/min, in the direction of his friend's house0.42 blocks/min0.42 blocks/min, in the direction of his friend's house Question #6MultipleChoice Score: A marble with a mass of 1.5 grams rolls at a constant rate of 0.50 cm/s across a table. What is the magnitude of the marble's momentum? Question #7MultipleChoice Score: Which law of motion accounts for the following statement? "A ball hit by a man travels faster than one hit by a boy." first lawsecond lawthird law Question #8MultipleChoice Score: Becca paddles a boat from the south bank of a stream to the north bank. She paddles at a rate of 8 mph. The stream is flowing west at a rate of 6 mph. Which of the following diagrams best illustrates the actual path of the boat? Question #9MultipleChoice Score: Suppose a car's momentum is calculated to be . The mass of the car is 1,500 kg. What is the magnitude of the velocity of the car? 24 km/hr0.042 km/hr37,500 km/hr34,500 km/hr Question #10MultipleChoice Score: Which of the following examples illustrates static friction in action? a ball rolling down a hilla skater gliding across the icea plane flying through the aira car starting to move after the light changes from red to green Question #11MultipleChoice Score: An athlete prepares to throw a 2.0-kilogram discus. His arm is 0.75 meters long. He spins around several times with the discus at the end of his out-stretched arm so that the discus reaches a velocity of 5.0 m/s. What is the centripetal force acting on the discus? 9.4 N14 N27 N66 N Question #12MultipleChoice Score: A squirrel runs at a steady rate of 0.51 m/s in a circular path around a tree. If the squirrel's centripetal acceleration is 0.43 m/s2, what is the radius of the circle? 0.60 m1.2 m0.36 m0.84 m Question #13TextMultipleChoice Score: Momentum is mass times distancetimeaccelerationvelocity . Question #14MultipleChoice Score: This graph depicts an object that has _____. positive accelerationconstant velocitynegative accelerationno acceleration Question #15MultipleChoice Score: Car A has a mass of 1,200 kg and is traveling at a rate of 22 km/hr. It collides with car B. Car B has a mass of 1,900 kg and is traveling in the same direction at 25 km/hr. Which of the following statements is true? The momentum before the collision is equal to the momentum after the collision.The momentum before the collision is greater than the momentum after the collision.The momentum before the collision is less than the momentum after the collision. Question #16MultipleChoice Score: Which of the following graphs has a slope that indicates positive acceleration? Question #17MultipleChoice Score: A team of dogs pulls a sled across the snow. The weight of the loaded sled is 2,200 N. The coefficient of friction is 0.15. How hard must the dogs pull so that their effort just equals the frictional force? 220 N330 N15,000 N34 N Question #18MultipleChoice Score: Which law of motion accounts for the following statement? "A car requires brakes in order to stop." first lawsecond lawthird law Question #19MultipleChoice Score: The natural resistance of any object to change its speed is called _____. velocityinertiaaccelerationgravity Question #20MultipleChoice Score: Jamal blasts an air-horn to start a race. Lewis hears the horn from his house 274 meters away. Given that sound travels through air at 340 m/s, how long did it take the sound to travel from Jamal to Lewis? 440 s0.81 s1.2 s66 s Question #21MultipleChoice Score: A force of 8,480 N is applied to a cart to decelerate it at a rate of 32.0 m/s2. What is the mass of the cart? 865 kg377 kg265 kg27.0 kg Question #22MultipleChoice Score: A race car travels on a circular track at an average rate of 125 mi/h. The radius of the track is 0.320 miles. What is the centripetal acceleration of the car? 391 mi/h240.0 mi/h25,000 mi/h248,800 mi/h2 Question #23MultipleChoice Score: At what time would the magnitude of the velocity reach 36.00 km/hr? 6.00 sec36.00 sec208.00 secIt is always the same, traveling at 36.00 km/hr. Question #24MultipleChoice Score: Rachel rides her bike east for 3.0 miles. She then turns around and rides west for 4.8 miles. What is her displacement? 7.8 miles1.8 miles1.8 miles, east1.8 miles, west
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