Average Speed of Electrical Circuit Physics Questions-University of California .

View Policies Current Attempt in Progress A plane is sitting on a runway, awaiting takeoff. On an adjacent parallel runway, another plane lands and passes the stationary plane at a speed of 40.9 m/s. The arriving plane has a length of 36.1 m. By looking out of a window (very narrow), a passenger on the stationary plane can see the moving plane. For how long a time is the moving plane visible?Number i Units A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 17.8 minutes at an average speed of 6.95 m/s. During the second part, she rides for 41.9 minutes at an average speed of 3.51 m/s. Finally, during the third part, she rides for 11.6 minutes at an average speed of 19.4 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is the average speed of the bicyclist for the trip? (a) Number i Units (b) Number i Units View Policies Current Attempt in Progress Electrons move through a certain electrical circuit at an average speed of 1.6 x 102 m/s. How long (in minutes) does it take an electron to traverse a 1.4-m light bulb filament coil? Number Units The data in the following table represent the initial and final velocities for a boat traveling along the x axis. The elapsed time for each of the four pairs of velocities in the table is 0.50 s. Review the concept of average acceleration in Section 2.3 and then determine the average acceleration (magnitude and direction) for each of the four pairs. Note that the algebraic sign of your answers will convey the direction. Initial velocity vo Final velocity v (a) +1.5m/s +4.7 m/s (b) +4.8m/s +1.9m/s (c) –5.8m/s -3.4 m/s (d) +3.9m/s -4.2 m/s (a) ā= i (b)ā – i (c)ā= i (d)ā= Over a time interval of 1.56 years, the velocity of a planet orbiting a distant star reverses direction, changing from +17.0 km/s to -19.1 km/s. Find (a) the total change in the planet’s velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. (a) Number i Units (b) Number i Units A runner accelerates to a final velocity of 5.67 m/s due west in 2.00 s. His average acceleration is 0.609 m/s2, also directed due west. (a) What was his velocity when he began accelerating? (Enter the magnitude of the initial velocity.) i (b) Select the direction: In an historical movie, two knights on horseback start from rest 84.9 m apart and ride directly toward each other to do battle. Sir George’s acceleration has a magnitude of 0.231 m/s2, while Sir Alfred’s has a magnitude of 0.349 m/s2. Relative to Sir George’s starting point, where do the knights collide? Number i Units Refer to Multiple-Concept Example 5 to review a method by which this problem can be solved. You are driving your car, and the traffic light ahead turns red. You apply the brakes for 2.25 s, and the velocity of the car decreases to +4.60 m/s. The car’s deceleration has a magnitude of 3.36 m/s2 during this time. What is the car’s displacement? X= Before starting this problem, review Multiple-Concept Example 6. The left ventricle of the heart accelerates blood from rest to a velocity of +26.7 cm/s. (a) If the displacement of the blood during the acceleration is +2.05 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity? (a) Number i Units (b) Number Units A dynamite blast at a quarry launches a rock straight upward, and 2.1 s later it is rising at a rate of 20 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b) 5.9 s after launch. (a)Number i ! Units m/s (b)Number i ! Units m/s V A golf ball is dropped from rest from a height of 9.50 m. It hits the pavement, then bounces back up, rising just 5.20 m before falling back down again. A boy then catches the ball when it is 1.00 m above the pavement. Ignoring air resistance, calculate the total amount of time that the ball is in the air, from drop to catch. hi hz Number i Units