University:
Eastern Kentucky University
Course:
PHY 131 | College Physics I
Academic year:

2022
Views:

269

Pages:

1
Author:

Alma Stephenson

2. What two units of measurement are necessary for describing speed? Distance & Time 6. What is the main difference between speed and velocity? Speed is a constant measurement while Velocity is an at the moment measurement 10. What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10s? 10km/h/s 15. What exactly is meant by a "freely falling" object? An object is falling with no regard to air resistance or any other outside support. Only gravity is affecting the object 22. What is the effect of air resistance on the acceleration of falling objects? There is no effect of air resistance on the acceleration on falling objects while they are in free fall. 29. Show that the average speed of a rabbit that runs a distance of 30 m in a time of 2 s is 15 m/s. Average Speed (15m/s) = Total distance covered (30m) / Time Interval (2s) = 15m/s 31. Show that the acceleration of a car that can go from rest to 100 km/h in 10 s is 10 km/h*s. Acceleration (10km/h*s) = Change in velocity (100km/h) / Time Interval (10s) =10km/h*s 34. Show that a freely falling rock drops a distance of 45 m when it falls from rest for 3s. Distance (45m) = ½ x 10m/s/s x Time (3s) x Time (3s) = 45m 38. A car takes 10 s to go from v = 0 m/s to v = 25 m/s at constant acceleration. If you wish to find the distance traveled using the equation d = 1/2at 2, what value should you use for a? 25m/s, since a means acceleration and 25m/s is the acceleration 61. Suppose that a freely falling object were somehow equipped with a speedometer. By how much would its reading in speed increase with each second of fall? 10m/s