Physics Acceleration
Chapter 6. Uniform Acceleration
Problems:
Speed and Velocity
6-1. A car travels a distance of 86 km at an average speed of 8 m/s. How many hours were required for the trip?
[pic] [pic] t = 2.99 h
6-2. Sound travels at an average speed of 340 m/s. Lightning from a distant thundercloud is seen almost immediately. If the sound of thunder reaches the ear 3 s later, how far away is the storm?
[pic] t = 58.8 ms
6-3. A small rocket leaves its pad and travels a distance of 40 m vertically upward before returning to the earth five seconds after it was launched. What was the average velocity for the trip?
[pic] v = 16.0 m/s
6-4. A car travels along a U-shaped curve for a distance of 400 m in 30 s. It’s final location, however is only 40 m from the starting position. What is the average speed and what is the magnitude of the average velocity? Average speed: [pic] v = 13.3 m/s Average velocity: [pic] v = 1.33 m/s, E
6-5. A woman walks for 4 min directly north with a average velocity of 6 km/h; then she walks eastward at 4 km/h for 10 min. What is her average speed for the trip? t1 = 4 min = 0.0667 h; t2 = 10 min = 0.167 h s1 = v1t1 = (6 km/h)(0.0667 h) = 0.400 km s1 = v2t2 = (4 km/h)(0.167 h) = 0.667 km [pic] v = 4.57 km/h
6-6. What is the average velocity for the entire trip described in Problem 6-5?
[pic] D = 0.778 km, 31.00
[pic] v = 3.33 km/h, 31.00
6-7. A car travels at an average speed of 60 mi/h for 3 h and 20 min. What was the distance?
t = 3 h + 0.333 h = 3.33 h; s = vt = (60 mi/h)(3.33 h); s = 200 mi
6.8 How long will it take to travel 400 km if the average speed is 90 km/h?
[pic] t = 4.44 h
*6-9. A marble rolls up an inclined ramp a distance of 5 m, then stops and returns to a point 5 m below its starting point. The entire trip took only 2 s. What was the average speed and what was the
Problems:
Speed and Velocity
6-1. A car travels a distance of 86 km at an average speed of 8 m/s. How many hours were required for the trip?
[pic] [pic] t = 2.99 h
6-2. Sound travels at an average speed of 340 m/s. Lightning from a distant thundercloud is seen almost immediately. If the sound of thunder reaches the ear 3 s later, how far away is the storm?
[pic] t = 58.8 ms
6-3. A small rocket leaves its pad and travels a distance of 40 m vertically upward before returning to the earth five seconds after it was launched. What was the average velocity for the trip?
[pic] v = 16.0 m/s
6-4. A car travels along a U-shaped curve for a distance of 400 m in 30 s. It’s final location, however is only 40 m from the starting position. What is the average speed and what is the magnitude of the average velocity? Average speed: [pic] v = 13.3 m/s Average velocity: [pic] v = 1.33 m/s, E
6-5. A woman walks for 4 min directly north with a average velocity of 6 km/h; then she walks eastward at 4 km/h for 10 min. What is her average speed for the trip? t1 = 4 min = 0.0667 h; t2 = 10 min = 0.167 h s1 = v1t1 = (6 km/h)(0.0667 h) = 0.400 km s1 = v2t2 = (4 km/h)(0.167 h) = 0.667 km [pic] v = 4.57 km/h
6-6. What is the average velocity for the entire trip described in Problem 6-5?
[pic] D = 0.778 km, 31.00
[pic] v = 3.33 km/h, 31.00
6-7. A car travels at an average speed of 60 mi/h for 3 h and 20 min. What was the distance?
t = 3 h + 0.333 h = 3.33 h; s = vt = (60 mi/h)(3.33 h); s = 200 mi
6.8 How long will it take to travel 400 km if the average speed is 90 km/h?
[pic] t = 4.44 h
*6-9. A marble rolls up an inclined ramp a distance of 5 m, then stops and returns to a point 5 m below its starting point. The entire trip took only 2 s. What was the average speed and what was the