BIO Human Biomechanics. The fastest served tennis ball, served by “Big Bill” Tilden in 1931, was measured at 73.14 m/s. The mass of a tennis ball is 57 g, and the ball, which starts from rest, is typically in contact with the tennis racquet for 30.0 ms. Assuming constant acceleration, (a) what force did Big Bill’s tennis racquet exert on the ball if he hit it essentially horizontally? (b) Draw free-body diagrams of the ball during the serve and just after it moved free of the racquet.
Learn your wayIncludes step-by-step video
Chapter 4 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
Additional Science Textbook Solutions
Introduction to Electrodynamics
Physics: Principles with Applications
College Physics (10th Edition)
Physics for Scientists and Engineers with Modern Physics
Essential University Physics: Volume 2 (3rd Edition)
- In the winter sport of curling, players give a 20 kg stone a push across a sheet of ice. The stone moves approximately 40 m before coming to rest. The final position of the stone, in principle, only depends on the initial speed at which it is launched and the force of friction between the ice and the stone, but team members can use brooms to sweep the ice in front of the stone to adjust its speed and trajectory a bit; they must do this without touching the stone. Judicious sweeping can lengthen the travel of the stone by 3 m. The sweepers in a curling competition adjust the trajectory of the stone byA. Decreasing the coefficient of friction between the stone and the ice.B. Increasing the coefficient of friction between the stone and the ice.C. Changing friction from kinetic to static.D. Changing friction from static to kinetic.arrow_forwardThe average speed of a nitrogen molecule in air is about 6.7 x 10^2 m/s, and its mass is 4.68 x 10^-26 kg. (a) If it takes 3.00 x 10^-13 s for a nitrogen molecule to hit a wall opposite direction, what is the average acceleration of the molecule during this time interval? (b) What average force does the molecule exert on the wall?arrow_forwardA 6000 - kg spaceship ( initially at rest ) leaves the Earth's surface traveling upward and reaches a height of 10 km in 10 sec . Assume the acceleration is constant. What is the upward acceleration of the rocket and the thrust?arrow_forward
- A hot air balloon begins to rise from rest. The lift on the balloon due to the buoyant force is 5000 N. In order to minimize the time until the passenger is reunited with their cell phone, what should the horizontal component of the passenger’s velocity be so that they land directly on their phone which is initially 3 m away in the horizontal direction?arrow_forwardA group of Chinese soldiers launches a small 8.00-kg rocket from artillery at an angle of 17 degrees from vertical and reaches a height of 150 meters. (a) Determine the rocket's velocity as it departs the artillery, ignoring air resistance or drag force. (b) The artillery is an 8-inch-long tube. Calculate the average acceleration of the rocket in the tube as it moves from zero to the velocity obtained in problem part a. (c) What is the average rocket force in the artillery? Express your answer in newton and as a ratio of the rocket's weight.arrow_forwardTwo crates, one with mass 4.00 kg and the other with mass6.00 kg, sit on the frictionless surface of a frozen pond, connected by a lightrope (Fig. P4.37). A woman wearing golf shoes (for traction) pulls horizontallyon the 6.00 kg crate with a force F that gives the crate an accelerationof 2.90 m>s2. (a) What is the acceleration of the 4.00 kg crate? (b) Draw afree-body diagram for the 4.00 kg crate. Use that diagram and Newton’ssecond law to find the tension T in the rope that connects the two crates.(c) Draw a free-body diagram for the 6.00 kg crate. What is the directionof the net force on the 6.00 kg crate? Which is larger in magnitude, T or F?(d) Use part (c) and Newton’s second law to calculate the magnitude of F.arrow_forward
- In a performance test, each of two cars takes 8.4 s to accelerate from rest to 28 m/s. Car A has a mass of 1415 kg, and car B has a mass of 1856 kg. Find the net average force that acts on (a) car A and (b) car B during the test. (a) F = (b) F = MI iarrow_forwardA 2540 kg test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force such that its vertical velocity as a function of time is given by v(t) = At + Bt2, where A and B are constants and time is measured from the instant the fuel is ignited. The rocket has an upward acceleration of 1.50 m/s2 at the instant of ignition and, 1.00 s later, an upward velocity of 2.00 m/s. (a) Determine A and B, including their SI units. (b) At 4.00 s after fuel ignition, what is the acceleration of the rocket, and (c) what thrust force does the burning fuel exert on it, assuming no air resistance? Express the thrust in newtons and as a multiple of the rocket’s weight. (d) What was the initial thrust due to the fuel?arrow_forwardTwo crates, one with mass 4.00 kg and the other with mass 6.00 kg, sit on the frictionless surface of a frozen pond, connected by a light rope (Fig. P4.39). A woman wearing golf shoes (for traction) pulls horizontally on the 6.00-kg crate with a force F that gives the crate an acceleration of 2.90 m/s^2. A). What is the acceleration of the 4.00-kg crate? B). Draw a free-body diagram for the 4.00-kg crate. Use that diagram and Newton’s second law to find the tension T in the rope that connects the two crates. C). Draw a free-body diagram for the 6.00-kg crate. What is the direction of the net force on the 6.00-kg crate? Which is larger in magnitude, T or F? D). Use part C and Newton’s second law to calculate the magnitude of F.arrow_forward
- A compact car has a maximum acceleration of 2.6. When it carries only the driver and has a total mass of 1345kg what is it the maximum acceleration after picking up four passengers and their luggage,adding an additional 400kg of mass ?arrow_forwardA flea jumps by exerting a force of 1.17 x 10-5 N straight down on the ground. A breeze blowing on the flea parallel to the ground exerts a force of 1.12 x 10-6 N on the flea. Find the direction and magnitude (in m/s²) of the acceleration of the flea if its mass is 6.0 × 10-7 kg. (Let us assume that wind points to the right. We will consider this to be the +x direction and vertical to be the +y direction.) magnitude direction m/s² ° (measured clockwise from the vertical)arrow_forwardWhen an object accelerates at 9.8 m/s2 (or 32 ft/s2), we say it accelerates with 1 g. This is true whether the object is falling under gravity, or due to something else. Using the constant-acceleration approximation, determine how many g's are involved in a football kickoff. The ball is initially at rest on the tee. After being in contact with the kicker’s foot for only 8 ms, it leaves the kicker’s foot at 118 ft/s. Round the final answer to the nearest whole number.arrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON