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Consider the information below representing the motion of a blue car traveling with constant velocity. Suppose that two seconds later, when t = 2, a red SUV begins traveling in the same direction as the blue car but with a constant velocity of 15 m/s. Which of these statements is true?
After 4 seconds of driving (when t = 6 s), the red SUV will pass the blue car.
Two students are working on a lab activity where they release two battery-powered cars from opposite sides of a 2 m long track at different times. One of the goals of the activity is to predict where the cars will collide. Suppose that the students define the following: Right is the positive direction car 1 starts at the left side of the track where x = 0 m, moving right. car 2 starts at the right side of the track where x = 2 m, moving left. In each trial, the time that car 1 is released is t = 0 seconds and t2 represents how many seconds later car 2 is released. Suppose that the students observed three trials for each value of t2. They recorded the average x value where the cars collided for each t2 release time in the table below: t2 (sec)x (m)01.0211.2621.4731.7841.97 Analyze the data above. Then, choose the best description of the experiment.
Both cars move with a speed of approximately 0.5 m/s
Which two of these statements are correct? Select two answers.
Force, like velocity, is a vector quantity. In the formula �→=∑�→�, mass is a scalar.
Consider the vectors shown below: �→,�→, and the resultant �→=�→+�→. Which of these must be true? I. ��→ must be larger than ��→ but smaller than ��→. II. The magnitude of �→ is found by adding the magnitude of �→ plus the magnitude of �→. III. The x-component of the resultant can by found by adding the x-component of �→ plus the x-component of �→. That is: �→�=�→�+�→�
I and III only
During a test, a rocket is launched straight up into the air with an initial speed of 60 m/s. The speed initially increases with a constant upward acceleration of 2.5 m/s2 until the engines stop. When the engines stop, the rocket is at a height of 300 meters. Which statement is correct? I. We can determine the amount of time the engines were used. II. At the moment when the engines have been on for half of their total run time, the rocket will be at a height of greater than 150 meters. III. The speed of the rocket is about 71 m/s when the engines turn off.
I and III only
Which of these is an important general safety guideline for AP Physics 1 labs? I. Prior to starting each lab, make sure you have access to safety equipment such as a fire extinguisher, safety goggles, and a first aid kit. Know where these items are before you start each lab. II. Follow the teacher's special safety guidelines as set forth prior to each experiment. You should record these as part of your design plan for each lab. III. When in doubt about the safety or advisability of a procedure, check with the teacher before proceeding.
I, II, and III
Which two of these statements are correct? Select two answers.
In a velocity versus time graph, the object's displacement equals the area between the graph and the horizontal axis. Uniform acceleration means that an object's velocity changes at a constant rate.
Two students collected data using a cart on a track with a motion detector set up on one end as shown below such that at time t = 0 sec, the cart was located at a position of 1 m away from the detector and rolling towards the detector. The motion detector captured the distance between the cart and the detector fifty times per second and the data is shown below. t (sec)position (meters)t (sec)position (meters)t (sec)position (meters)0.020.9580.120.7480.220.5380.040.9160.140.7060.240.4960.060.8740.160.6640.260.4540.080.8320.180.6220.280.4120.100.790.200.5800.300.37 Analyze the data to determine if the motion occurred at a constant velocity. If the cart moved with a constant velocity, then calculate that velocity. If not, then calculate the average velocity of the cart and describe the motion of the cart.
The cart moved at a constant velocity of -2.1 m/s.
Two identical solid spheres are going to be dropped from the roof of a building as part of an experiment. Suppose that the spheres will be dropped in a manner such that air resistance is negligible. A timer is started when the first sphere is dropped and then 0.500 s later the second sphere is dropped. Consider what happens to the difference between the speed of each sphere as they fall and consider what happens to the distance between them as they fall. Which of these statements is correct?
The distance between the spheres increases as they fall because the first sphere is always moving faster than the second sphere.
Which statement best describes the motion of the object which generated the position versus time graph shown below?
The object began moving in the positive direction speeding up, then continued moving in the positive direction with a constant velocity, and finally began moving in the positive direction slowing down.
