Concept explainers
(a)
The average speed of car.
(a)
Answer to Problem 50P
The average speed of car is
Explanation of Solution
Given:
The average speed of car is
Formula used:
Average speed is defined as total distance travelled by an object in unit time interval.
Write the expression for average speed.
Here,
Rearrange the above expression in terms of
Calculation:
Substitute
Substitute
Calculate the total distance travelled by car.
Calculate the total time taken by car.
Substitute
Conclusion:
Thus, the average speed of car is
(b)
The average speed of the car.
(b)
Answer to Problem 50P
The average speed of the car is
Explanation of Solution
Given:
The average speed in
Formula used:
Rearrange the equation (II) in terms of
Calculation:
Substitute
Substitute
Calculate the total distance travelled by car.
Calculate the total time taken by car.
Substitute
Conclusion:
Thus, the average speed of the car is
Want to see more full solutions like this?
Chapter 1 Solutions
EBK PHYSICS FUNDAMENTALS
- A car travels 2.00 km at an average speed of 72.0 km and then 2.00 km at an average speed of 39.0 km/h. What is the car‘s average speed during the entire 4.00 km interval?arrow_forwardA person takes a trip, driving with a constant speed of 89.5 km/h, except for a 22 minute rest stop. If the persons average speed is 77.8 km/h how much time is spent on the trip and what distance did they travel?arrow_forwardThe minimum distance required to stop a car moving at 35.0 mi/h is 40.0 ft. What is the minimum stopping distance for the same car moving at 70.0 mi/h, assuming the same rate of acceleration?arrow_forward
- A deer is running east to west on a straight line. It runs (a) at a constant speed of 2.5 m/s for the first 24 sec, (b) at a reduced speed (also constant) of 0.6 m/s for the next 15 sec, (c) sprints at a constant speed of 3.1 m/s for the next 1 minute and 40 seconds. Compute the total distance covered and the average speed in mph.arrow_forwardIn good weather the drive from Seattle to Spokane,Washington, on Interstate 90 takes 3 h 51 min at an average speed of 105 km/h.In winter, however, it is not unusual to average only 80 km/h.How long would the trip take at this average speed?arrow_forwardA rock is thrown directly upward from the edge of the roof of a building that is 43.8 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude 9.80 m/s^2 and neglect any effects of air resistance. With what speed was the rock thrown?arrow_forward
- A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 47 m/s, and the average southward velocity has a magnitude of 31 m/s. Taking northward to be the positive direction, what is the average velocity, in m/s, for the trip?arrow_forwardAt a certain time a particle had a speed of 41 m/s in the positive x direction, and 6.5 s later its speed was 80 m/s in the opposite direction. What was the average acceleration of the particle during this 6.5 s interval?arrow_forwarda train 500 m long is moving on a straight track with a speed of 81.0 km/h. the engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 17.4km/h. assuming constant acceleration, determine how long the train blocked the crossing. disregard the width of the crossing.arrow_forward
- At 3:00 P.M. a truck travelling on a winding highway has a velocity of 82.0 km/h [38.2° E of N]; at 3:15 P.M., it has a velocity of 82.0 km/h [12.7° S of E]. Assuming that +x is east and +y is north, determine the x- and y-components of the average acceleration during this time interval.arrow_forwardThe speed of a bullet is measured to be 640 m/s as the bullet emerges from a barrel of length 1.20 m.Assuming constant acceleration, find the time that the bullet spends in the barrel after it is fired.arrow_forwardA train travels 253 km at an average speed of 92 km/hr then 45 km atan average speed of 10 m/s. Find the average speed for the wholejourney in km/hr.arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning