Software de Aplicacion

Essay, Pages 3 (511 words)

Views

464

1. Marissa's car speeds up consistently at a rate of +2.60 m/s2. How long does it consider Marissa's car to accelerate from a speed of 24.6 m/s to a speed of 26.8 m/s? 2. A bowling ball with an unfavorable preliminary speed slows down as it rolls down the lane towards the pins. Is the bowling ball's acceleration favorable or unfavorable as it rolls towards the pins? 3. Nathan accelerates his skateboard consistently along a straight path from rest to 12.5 m/s in 2.5 s. a. What is Nathan's velocity? b. What is Nathan's displacement during this time period? c. What is Nathan's average speed throughout this time period? 4. Crucial Thinking 2 cars are moving in the very same direction in parallel lanes along a highway. At some instant, the instantaneous velocity of cars and truck An exceeds the immediate speed of automobile B. Does this mean that automobile A's velocity is greater than vehicle B's? Explain, and use examples. 5. Interpreting Graphics The velocity-versus-time chart for a shuttle bus moving along a straight course is shown in Figure 13.

a. Identify the time periods throughout which the speed of the shuttle 8.0 is continuous. 7.0 b. Identify the time periods during 6.0 5.0 which the velocity of the shuttle bus 4.0 3.0 bus is consistent. 2.0 1.0 c. Discover the value for the average veloc0 − 1.0 100 200 300 400 500 600 ity of the shuttle throughout each − 2.0 time period determined in b. − 3.0 − 4.0 d. Find the acceleration of the shuttle bus − 5.0 − 6.0 bus during each time interval identi − 7.0 − 8.0 fied in b. Time (s) e. Determine the times at which the velocity of the shuttle is zero.

Figure 13 f. Identify the times at which the velocity of the shuttle is no. g. Explain what the slope of the graph exposes about the velocity in each time period. 6. Interpreting Graphics Is the shuttle in item 5 always relocating the exact same direction? Explain, and refer to the time periods shown on the chart. Speed (m/s).

Area review answers.

1. 0.85 s 2. positive 3. a. +5.0 m/s2 b. +16 m c. +6.4 m/s 4.. No, car A’s acceleration is not necessarily greater than car B’s acceleration; If the two cars are moving in the positive direction, car A could be slowing down (negative acceleration) while car B is speeding up (positive acceleration),
even though car A’s velocity is greater than car B’s velocity. 5. a. 0 s to 30 s; 60 s to 125 s; 210 s to 275 s b. 0 s to 30 s; 30 s to 60 s; 60 s to 125 s; 125 s to 210 s; 210 s to 275 s; 275 s to 300 s; 300 s to 520 s; 520 s to 580 s c. 0 m/s; 1.5 m/s; 0 m/s; 1.5 m/s; 0 m/s; −0.75 m/s; −3.25 m/s; −4.5 m/s d. 0 m/s2; 0.1 m/s2; 0 m/s2; −0.04 m/s2; 0 m/s2; −0.06 m/s2; −0.02 m/s2; 0.02 m/s2 e. 0 to 30 s; 210 to 275 s f. 0 s to 30s; 60 s to 125 s; 210 s to 275 s g. When the graph slopes upward, acceleration is positive. When it slopes downward, acceleration is negative. 6. No; The bus is moving in the positive direction from 30 s to 210 s (when velocity is positive) and in the negative direction from 275 s to 600 s (when velocity is negative).

Motion in One Dimension