Concept explainers
Additional Integrated Problems
Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. A 210 kg dolphin leaps straight up to a height of 7.0 m. When the dolphin reenters the water, drag from the water brings it to a stop in 1.5 m. Assuming that the force of the water on the dolphin stays constant as it slows down,
a. How much time does it take for the dolphin to come to rest?
b. What is the force of the water on the dolphin as it is coming to rest?
Want to see the full answer?
Check out a sample textbook solutionChapter P Solutions
College Physics: A Strategic Approach (3rd Edition)
Additional Science Textbook Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Campbell Biology (11th Edition)
Campbell Essential Biology with Physiology (5th Edition)
Applications and Investigations in Earth Science (9th Edition)
Chemistry: Structure and Properties (2nd Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
- An ice sled powered by a rocket engine sum from rest on a large frozen lake and accelerates at + 40 ft/s2. After some time t1, the rocket engine is shut down and the sled moves with constant velocity v for a time t2. If the total distance traveled by the sled is 17 500 ft and the total time is 90 s. find (a) the times t1 and t2 and (b) the velocity v. At the 17 500-ft mark, the sled begins to accelerate at 20 ft/s2. (c) What is the final position of the sled when it comes to rest? (d) How long does it take to come to rest?arrow_forwardTwo thin rods are fastened to the inside of a circular ring as shown in Figure P2.42. One rod of length D is vertical, and the other of length L makes an angle with the horizontal. The two rods and the ring lie in a vertical plane. Two small beads are free to slide without friction along the rods. (a) If the two beads are released from rest simultaneously from the positions shown, use your intuition and guess which bead reaches the bottom first. (b) Find an expression for the time interval required for the red head to fall from point to point in terms of g and D. (c) Find an expression for the time interval required for the blue bead to slide from point to point in terms of g, L, and . (d) Show that the two time intervals found in parts (b) and (c) are equal. Hint: What is the angle between the chords of the circle and ? (e) Do these results surprise you? Was your intuitive guess in part (a) correct? This problem was inspired by an article by Thomas B. Greenslade, Jr., Galileos Paradox, Phys. Teach. 46, 294 (May 2008). Figure P2.42arrow_forwardCASE STUDY Imagine an indoor tennis court on a cruise ship moving at constant velocity. Assume the court is oriented so that one player faces the bow (forward) and the other the stem (backward). Does one player have an advantage over the other? If so, which one? Explain your answers.arrow_forward
- . The roller coaster in Figure 1.39 starts at the top of a straight track that is inclined 30° with the horizontal. This causes it to accelerate at a rate of 4.9 m/s2 (1/2 g). (a) What is the roller coasters speed after 3 s? (b) How far does it travel during that time?arrow_forwardAfter a long and grueling race, two cadets, A and B, are coming into the finish line at the Marine Corps marathon. They move in the same direction along a straight path; the position-versus-time graphs for the runners are shown in Figure P2.7 for a minute near the end of the race. a. At time t1 is the speed of cadet B greater than, less than, or equal to the speed of cadet A? b. At time t2, is cadet B speeding up, slowing down, or moving with constant speed? c. From time t = 0 to time t = 60 s, is the average speed of cadet B greater than, less than, or equal to the average speed of cadet A? Explain.arrow_forwardTwo objects, A and B, are connected by hinges to a rigid rod that has a length L. The objects slide along perpendicular guide rails as shown in Figure P2.40. Assume object A slides to the left with a constant speed v. (a) Find the velocity vB of object B as a function of the angle . (b) Describe vB relative to v. Is vB always smaller than v, larger than v, or the same as v, or does it have some other relationship? Figure P2.40arrow_forward
- Q3 Suppose that a rocket which starts from rest fall in a constant gravitational field. At the instant it tarts to fall it eject gas at constant rate a in the direction of the gravitational field at speed v0 with espect to the rocket. a. Find the speed after any time t. b. How far does the rocket in time t.arrow_forwardC. Marked out of 1.00 Time left 0:55:28 P Flag question An object of mass m= 5 kg was subjected to two forces; 6N in the positive x-direction and 8N in the positive y-direction simultaneously. What is the magnitude of its acceleration in m/s? a. b. 2 1 d. 4 Clear my choicearrow_forwardThe graph shows the force-time graph for a cart on a track (albeit a somewhat unrealistic one since the force goes from one value to another in zero time). a. calculate the area under the force-time graph. What physical quantity does your result give? Don't forget to give units. b. Draw a different force-time graph on the same axes that gives the same result.arrow_forward
- 1. A 500.0 N student standing on a scale in an elevator notices that the scale reads 550.0 N. a. From this information, the student knows that the elevator’s acceleration isA) upward.B) downward.C) The student cannot tell whether the elevator is accelerating upward or downward.b. From this information, the student knows that the elevator’s velocity isD) upward.E) downward.F) The student cannot tell whether the elevator is moving upward or downward.2. You swing a bat and hit a heavy box with a force of 1600 N. a. If the box moves when you hit it, the force the box exerted on the bat when hit isA) greater than 1600 N if the bat bounces back.B) greater than 1600 N.C) exactly 1600 N.D) less than 1600 N *please write a detail as much as possible for both questionarrow_forwardsapp.com Describe the motion of a person not wearing a seat belt if the car stops suddenly Select one: The car will stop and the person will speed up. Ob. The person will stop faster than the car because they are lighter. Oc The car will stop and the person will keep moving forward because of inertia Od The person and car will stop together 36°C lb DELL F2 F4 F5 F6 F7 F8 BIO F9 F10 F11 F12 Home End 144 44 %23 24arrow_forward1. A rocket is launched off the ground in which the foot pump produces 20 N [Right 60 Up] on the rocket (m = 200g) for 0.15 seconds. *Neglect air resistance* a. Draw an F.B.D. when the force is being applied to the rocket. b. What is the acceleration of the rocket as it is launched? c. How far does the rocket travel during the time the force is applied? d. Draw an F.B.D. when the force is no longer applied (while traveling in the air). e. At the end of the Force Applied, what is the: i. Velocity of the rocket? ii. Velocity of the rocket (horizontally)? iii. Velocity of the rocket (vertically)?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPhysics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning