A ball is hanging from a long siring that is tied to the ceiling of a train car traveling eastward on horizontal tracks. An observer inside the train car sees the ball hang motionless. Draw a clearly labeled free-body diagram for the ball if (a) the train has a uniform velocity and (b) the train is speeding up uniformly. Is the net force on the ball zero in either case? Explain.
Learn your wayIncludes step-by-step video
Chapter 4 Solutions
MASTERINGPHYSICS W/ETEXT ACCESS CODE 6
Additional Science Textbook Solutions
College Physics (10th Edition)
The Cosmic Perspective Fundamentals (2nd Edition)
Physics for Scientists and Engineers with Modern Physics
College Physics
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Essential University Physics: Volume 1 (3rd Edition)
- A toy wagon is on a straight, horizontal track and has a fan attached to one end. The wagon is placed at one end of the track and the fan is connected. The wagon, which was at rest, begins to move and in 4.55s it has moved 1.5m. The mass of the car and the fan is 355g and we assume that it is moving with constant acceleration. a). What is the net force exerted on the wagon? b). Weights are added to the wagon until it has a mass of 722g and the experiment is repeated. How long will it take for the wagon to move 1.5 m? Ignore the effects of friction.arrow_forwardA rifle shoots a 4.30 g bullet out of its barrel. The bullet has a muzzle velocity of 985 m/s just as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 43.0 cm starting from rest, with no friction between the bullet and the barrel. What force does the rifle exert on the bullet while it is in the barrel? b. Draw a free-body diagram of the bullet while it is in the barrel. Draw a free-body diagram of the bullet just after it has left the barrel. d. How many g 's of acceleration does the rifle give this bullet? e. For how long a time is the bullet in the barrel? a. с. The figarrow_forwardTwo blocks are connected via a pulley, both blocks have a mass of 10.kg. One block rests on a horizontal surface and the other one hangs freely by a cord which passes over a pulley. Assume the cord does not stretch, ignore mass of pulley and cord, therefore acceleration is the same for both blocks and tension is the same for both blocks. The hanging block moves down so the block lying on the horizontal surface moves to the right. e. A jewelry box is placed on the dashboard of a car and slides forward when the car decelerates from 20m/s to rest in 4.0 seconds, but not if the deceleration is a little bit longer. Find the coefficient of static friction between the box and the dashboard.arrow_forward
- An aircraft carrier uses a device called a catapult to help accelerate jets to the speed needed for take off. The flight decks on these carriers have length d = 82 m. A jet with a mass of m = 12571 kg can be accelerated from rest to a speed of v = 49 m/s by the end of the flight deck. A.) calculate the numerical value of the magnitude of force F in newtons. B.) Wht is the numerical value of the ratio of the launch force F to the jets weight?arrow_forwardA 15.0N force pushes a piece of brass to the right. It took 4.0 seconds for the piece of brass to slide 35.0 meters horizontally on a steel surface at a starting velocity of 5.0 m/s. The coefficient of kinetic friction between the brass and steel is 0.37. a). Draw the free-body diagram of the piece of brass.b). What is the acceleration of the piece of brass within the given time frame?c). What is the mass of the piece of brass?arrow_forwardQuestion 1. a) Consider a uniform force field where the force acting on a body has the same magnitude everywhere, pointing in the same direction (along the y-axis). Derive the formulae for the range and height of a body launched with velocity v at an angle 0 to the x-axis. b) Give two different examples where you might find such a uniform force field. What is the acceleration on the body in each example? c) Consider a projectile launched on the surface of the Earth. How fast does its initial velocity need to be before the assumption of a uniform force field in part a) becomes invalid? (Assume a launch angle of 45°). Explain your answer. (Hint: you will probably need to account for the horizon on Earth).arrow_forward
- A block with mass of m1=2 kg is placed on top of a block with a mass m2=4kg. A horizontal force F=60N is applied to the block m2 is tied to the wall. The coefficient of kinetic friction between all surfaces is 0.4. Draw a free-body diagram for each block and identify the action-reaction forces between the blocks. Determine the tension in the siring and the magnitude of the acceleration of the block m2.(g=9.8 m/s^2)arrow_forwardA 7 kg block is resting on a horizontal tabletop. A 3 kg block is on top of the 7 kg block. An applied force of 12 N is exerted straight downward on the top block. Draw the free-body diagrams on each block and find (a) the magnitude of the normal force on the 3 kg block from the 7 kg block, and (b) the magnitude of the normal force on the 7 kg block from the table.arrow_forwardSuperman must stop a 105-km/h train in 100 m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 105 kg. A.) Determine the force that must be exerted on the train. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity. FTS =_____________________ ______________________ B.) Compare the magnitudes of the force exerted on the train and the weight of the train (give as %%). Express your answer using two significant figures. FTS/mg = _______________________% C.) How much force does the train exert on Superman? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is…arrow_forward
- Sand falls from a stationary hopper onto a freight car that is moving with uniform velocity v. The sand falls at the rate dm/dt. How much force is needed to keep the freight car moving at the speed v?arrow_forwardA 15.0-N force pushes a piece of brass to the right. It took 4.0 seconds for the piece of brass to slide 35.0 meters horizontally on a steel surface at a starting velocity of 5.0 m/s. The coefficient of kinetic friction between the brass and steel is 0.37. (a) Draw the free-body diagram of the piece of brass. (b) What is the acceleration of the piece of brass within the given time frame? (Ans: 1.88 m/s) (c) What is the mass of the piece of brass? (Ans: 2.73 kg)arrow_forwardMY NOTES ASK YOUR TEACHER You have landed on an alien planet and because you have nothing better to do with your time, you have decided to do a physics experiment with a block. Your experiment is shown above. A 60 kg block on a horizontal surface is attached to a rope. The normal force on the block is 378 N. The block is moving to the right, k = 0.6, & the acceleration of the block is 5.22 m/s² to the right. Determine g (the free fall acceleration on this planet) & the tension in the rope. g = FT =arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning