Concept explainers
A cruise ship is moving at constant speed through the water. The vacationers on the ship are eager to arrive at their next destination. They decide to try to speed up the cruise ship by gathering at the bow (the front) and running together toward the stem (the back) of the ship. (i) While they are running toward the stern, is the speed of the ship (a) higher than it was before, (b) unchanged, (c) lower than it was before, or (d) impossible to determine? (ii) The vacationers stop running when they reach the stem of the ship. After they have all stopped running, is the speed of the ship (a) higher titan it was before they started running, (b) unchanged from what it was before they started running, (c) lower than it was before they started running, or (d) impossible to determine?
Trending nowThis is a popular solution!
Chapter 9 Solutions
Physics for Scientists and Engineers
- A plane is heading on a bearing of 200° with an air speed of 400 km/h when it is blown off course by a wind of 100 km/h from the northeast. Determine, the resultant ground velocity of the plane.arrow_forwardA red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward each other on a straight, level track. When they are 950 m apart, each engineer sees the other's train and applies the breaks. The brakes slow each train at the rate of 1.0 m/s^2. Is there a collision? If so, what is the speed of the red train and the speed of the green train? If not, what is the separation between the trains when they stop?arrow_forwardA boat crosses a river of width 225 m in whichthe current has a uniform speed of 1.35 m/s.The pilot maintains a bearing (i.e., the direction in which the boat points) perpendicularto the river and a throttle setting to give aconstant speed of 2.92 m/s relative to the water.What is the magnitude of the speed of theboat relative to a stationary shore observer?Answer in units of m/s. How far downstream from the initial positionis the boat when it reaches the opposite shore?Answer in units of marrow_forward
- When are you most aware of motion in a moving vehicle—when it is moving steadily in a straight line or when it is accelerating? If a car moved with absolutely constant velocity (no bumps at all), would you be aware of motion?arrow_forwardA ball is tossed horizontally from the highest point of a 75 m building and lands 150 m from the base of the building. Ignore air resistance, and use a coordinate system whose origin is at the highest point of the building, with positive y upwards and positive x in the direction of the throw. How long is the ball in the air for, in seconds?arrow_forwarda boat leaves a dock at 2:00 p.m., heading west at 15 km/h. Another boat heads south at 12 km/h and reaches the same dock at 3:00 p.m. When were the boats closest to each other?arrow_forward
- A particle initially located at the origin has an acceleration of = 1.00ĵ m/s2 and an initial velocity of i = 9.00î m/s. (a) Find the vector position of the particle at any time t (where t is measured in seconds). (b) Find the velocity of the particle at any time t. (c) Find the coordinates of the particle at t = 3.00 s. (d) Find the speed of the particle at t = 3.00 s.arrow_forwardThe operator of a boat wishes to cross a 5-km wide river that is flowing to the east at 10 m/s. He wants to reach the exact point on the opposite shore 15 min after starting. With what speed and in what direction should the boat travel?arrow_forwardA cross-country skier skis 1.0 km north and then 2.0 km east. How far and in what direction is she from the starting point? What are the magnitude and direction of her resultant displacement? (Complete solution)arrow_forward
- A vertically projected object has zero velocity at its maximum height, but the acceleration is not zero. What would be implied if the acceleration were zero?arrow_forwardA particle is moving on xy plane, with x=15sin(2t), and y = 20cos(2t) Find the magnitude of the velocity as a function of timearrow_forwardA boat heads directly accross a river 220 m wide. it takes it 570 seconds to cross, but it ends up 100 m downstream. what its peed relative to the water? that is how fast is the boat?arrow_forward
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning