4.21 ⚫ BIO World-class sprinters can accelerate out of the startingblocks with an acceleration that is nearly horizontal and has magnitude15 m/s². How much horizontal force must a 55 kg sprinter exert on thestarting blocks to produce this acceleration? Which object exerts theforce that propels the sprinter: the blocks or the sprinter herself?

Approach to solving the question:Newton's Second and Third LawDetailed explanation:The sprinter…

Answered: 4.21 ⚫ BIO World-class sprinters can…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 49P: A baseball catcher is performing a stunt for a television commercial. He will catch a baseball (mass...

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On June 25, 1983, shot-putter Udo Beyer of East Germany threw the 7.26-kg shot 22.22 m, which at that time was a world record. (a) If the shot was released at a height of 2.20 m with a projection angle of 45.00, what was its initial velocity? (b) If while in Beyer’s hand the shot was accelerated uniformly over a distance of 1.20 m, what was the net force on it?
A 3.00-kg object is moving in a plane, with its x and y coordinates given by x = 5t2 1 and y = 3t3 + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.00 s.
A particle with mass m = 4.00 kg accelerates according to a=(300i+200j) m/s2. a. What is the net force acting on the particle? b. What is the magnitude of this force?
Two boxes with masses m1 = 4.00 kg and m2 = 10.0 kg are attached by a massless cord passing over a frictionless pulley as shown in Figure P5.79. The incline is frictionless, and = 30.0. a. Draw a free-body diagram for each of the boxes. b. What is the magnitude of the acceleration of the boxes? c. What is the tension in the cord connecting the boxes? d. What is the speed of each of the boxes 3.00 s after the system is released from rest? FIGURE P5.79
(a) What force causes an automobile to move? (b) A propeller-driven airplane? (c) A rowboat?
Review. The gravitational force exerted on a baseball is Fgj. A pitcher throws the ball with velocity vi by uniformly accelerating it along a straight horizontal line for a time interval of t = t 0 = t. (a) Starting from rest, through what distance does the hall move before its release? (b) What force does the pitcher exert on the hall?
The x and y coordinates of a 4.00-kg particle moving in the xy plane under the influence of a net force F are given by x = t4 6t and y = 4t2 + 1, with x and y in meters and t in seconds. What is the magnitude of the force F at t = 4.00 s?
A man whirls a 0.20-kg piece of lead attached to the end of a string of length 0.500 m in a circular path and in a vertical plane. If the man maintains a constant speed of 4.00 m/s, what is the tension in the string when the lead is (a) at the top of the circular path? (b) at the bottom of the circular path? (Sec Section 7.4.)
Review. The gravitational force exerted on a baseball is 2.21 N down. A pitcher throws the ball horizontally with velocity 18.0 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 170 ms. The ball starts from rest, (a) Through what distance does it move before its release? (b) What are the magnitude and direction of the force the pitcher exerts on the hall?
Three crates with masses m1 = 5.45 kg, m2 = 7.88 kg, and m3 = 4.89 kg are in contact on a frictionless surface. A horizontal force F = 205 N is applied to the third crate as shown in Figure P5.83. a. What is the magnitude of the contact force between crates 1 and 2? b. What is the magnitude of the contact force between crates 2 and 3? FIGURE P5.83
What properties do forces have that allow us to classify them as vectors?
A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?

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