Concept explainers
Refer to the tracks in Exercise 107.
(a) Does ball B roll faster along the lower part of track B than ball A rolls along the straighter track A?
(b) Is the speed gained by ball B going down the extra dip the same as the speed it loses going up near the right-hand end—and doesn’t this mean that the speeds of balls A and B will be the same at the ends of both tracks?
(c) On track B, won’t the average speed dipping down and up be greater than the average speed of ball A during the same time?
(d) So, overall, does ball A or ball B have the greater average speed? (Do you wish to change your answer to Exercise 107?)
Want to see the full answer?
Check out a sample textbook solutionChapter 1 Solutions
Conceptual Physical Science (6th Edition)
Additional Science Textbook Solutions
The Cosmic Perspective (8th Edition)
University Physics with Modern Physics (14th Edition)
Applied Physics (11th Edition)
Introduction to Electrodynamics
University Physics Volume 2
The Cosmic Perspective Fundamentals (2nd Edition)
- Why is Newton's version of Kepler's third law so useful to astronomers? It is the only way to determine the masses of many distant objects. O It tells us how rapidly a planet spins on its axis. O It explains why objects spin faster when they shrink in size. O It tells us that more-distant planets orbit the Sun more rapidly.arrow_forwardQUESTION 2 At a location where gravity acceleration constant g=9.80 m/s2, a projectile returns to its original height after 5.9 seconds, during which time it travels 74.1 meters horizontally. If air resistance can be neglected, what was the projectile's initial speed: vo = (Note: For fill in blank, I have set the unit for the answer. So, you just need to provide a number - Please write your numerical answer with all digits and do not use scientific notation. If you are not sure about the number of significant figures, you can keep the number of figures as many as possible - You will not be punished for doing this. ) m/s ? QUESTION 3 An airplane needs to reach a forward velocity of 203.0 km/h (Please pay attention to the unit km/h here - km = 1000 m, h = hour) to take off. On a 2000-m runway, what is the minimur uniform acceleration necessary for the plane to take flight if it starts from rest? OA 0.95 m/s2 O B. 0.87 m/s2 OC 1.0 m/s2 Click Save and Submit to save and submit. Click Save…arrow_forwardLet's say for the purpose of this question that a softball pitcher completes one perfect revolution during her fast pitch. The pitcher's arm is 0.81585 m, and she completes her pitch in 0.9s, what is the velocity of the ball as it travels around the arc? Assume she keeps her arm extended throughout the pitch, and round your answer to two decimal points. What is the centripetal acceleration of the softball?arrow_forward
- The wrench starts at rests and is accelerating at 2 m/s^2 while you throw it, at a given time you notice it has a velocity of 10 m/s, how long was it accelerating for? 2 seconds O 4 seconds O 5 seconds O 10 seconds O 15 secondsarrow_forwardA ball is thrown horizontally from a cliff at a speed of 20 m/s. What will it's speed be after 2 seconds, and after 3 seconds?arrow_forwardFind a smooth surface that is positioned at an angle (a long board, a slide at a playground, a sloped driveway, etc.). Measure the distance from the starting point up the hill to the finishing point down the hill. Place a smooth running toy at the top of the hill, and let go. Measure the time it takes for the toy to roll down to the bottom of the hill. Repeat 4 more times. Use the middle of the 5 measurements for your calculations. Use the equation: a = g sin (q) to find the acceleration due to gravity. Off course you’ll need the equations of kinematics to determine the acceleration “a” first before finding g. Again compare your result to the actual value of 9.80 m/sec2 Then list 5 possible reasons why your result was different than the expected value. Data Time (in seconds) for 5 attempts: 3.5, 3.2, 3.8, 3.4, 3.7 Distance from starting point to end point: 9 feet Degree of the slide from which toy car rolls down: 45 degreesarrow_forward
- According to the National Academy of Sciences, the Earths surface temperature has risen about 1F since 1900. There is evidence that this climate change may be due to human activity. The organizers of World Jump Day argue that if the Earth were in a slightly larger orbit, we could avoid global warming and climate change. They propose that we move the Earth into this new orbit by jumping. The idea is to get people in a particular time zone to jump together. The hope is to have 600 million people jump in a 24-hour period. Lets see if it will work. Consider the Earth and its inhabitants to make up the system. a. Estimate the number of people in your time zone. Assume they all decide to jump at the same time; estimate the total mass of the jumpers. b. What is the net external force on the Earthjumpers system? c. Assume the jumpers use high-tech Flybar pogo sticks (Fig. P8.32), which allow them to jump 6 ft. What is the displacement of the Earth as a result of their jump? d. What happens to the Earth when the jumpers land?arrow_forwardAn astronomy textbook is to be dropped from a tall building on Earth. One second after dropped, what are the textbook’s speed, velocity, and acceleration? After 2 seconds? After 3 seconds? The book hits the ground; what are the book’s speed, velocity, and acceleration?arrow_forwardSuppose you can communicate with the inhabitants of a planet in another solar system. They tell you that on their planet, whose diameter and mass are 5.0103km and 3.61023kg , respectively, the record for the high jump is 2.0 m. Given that this record is close to 2.4 m on Earth, what would you conclude about your extraterrestrial friends’ jumping ability?arrow_forward
- Suppose you throw a rock nearly straight up at a coconut in a palm tree and the rock just misses the coconut on the way up but hits the coconut on the way down. Neglecting air resistance and the slight horizontal variation in motion to account for the hit and miss of the coconut, how does the speed of the rock when it hits the coconut on the way down compare with what it would have been if it had hit the coconut on the way up? Is it more likely to dislodge the coconut on the way up or down? Explain.arrow_forwardAn astronaut is in space with a baseball and a bowling ball. The astronaut gives both objects an equal push in the same direction. Does the baseball have the same inertia as the bowling ball? Why? Does the baseball have the same acceleration as the bowling ball from the push? Why? If both balls are traveling at the same speed, does the baseball have the same momentum as the bowling ball?arrow_forwardA race car goes around a curve at 60 m/s. The radius of the curve is 400 m, and car's mass is 600 kg. What is the car's acceleration in g's? Round to 2 decimal places.arrow_forward
- Foundations of Astronomy (MindTap Course List)PhysicsISBN:9781337399920Author:Michael A. Seeds, Dana BackmanPublisher:Cengage LearningStars and Galaxies (MindTap Course List)PhysicsISBN:9781337399944Author:Michael A. SeedsPublisher:Cengage Learning
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning