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Review Question 4.2 The x- and y-components of Newton’s second law for a specific scenario are:
Draw a force diagram for the system and a sketch of a possible scenario.
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- Review. A force platform is a tool used to analyze the performance of athletes by measuring the vertical force the athlete exerts on the ground as a function of time. Starting from rest, a 65.0-kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact with the platform during the time interval 0t 0.800 s, the force she exerts on it is described by the function F = 9 200t 11 500 t2 where F is in newtons and t is in seconds. (a) What impulse did the athlete receive from the platform? (b) With what speed did she reach the platform? (c) With what speed did she leave it? (d) To what height did she jump upon leaving the platform?arrow_forwardConstruct Your Own Problem Consider an astronaut in deep space cut free from her space ship and needing to get back to it. The astronaut has a few packages that she can throw away to move herself toward the ship. Construct a problem in which you calculate the time it takes her to get back by throwing all the packages at one time compared to throwing them one at a time. Among the things to be considered are the masses involved, the force she can exert on the packages through some distance, and the distance to the ship.arrow_forwardA 0.500-kg potato is fired at an angle of 80.0 above the horizontal from a PVC pipe used as a “potato gun” and reaches a height of 110.0 m. (a) Neglecting air resistance, calculate the potato’s velocity when it leaves the gun. (b) The gun itself is a tube 0.430 m long. Calculate the average acceleration of the potato in the tube as it goes from zero to the velocity found in (a). (c) What is the average force on the potato in the gun? Express your answer in newtons and as a ratio to the weight of the potato.arrow_forward
- You have just planted a sturdy 2-m-tall palm tree in your front lawn for your mother's birthday. Your brother kicks a 500 g ball, which hits the top of the tree at a speed of 5 m/s and stays in contact with it for 10 ms. The ball falls to the ground near the base of the tree and the recoil of the tree is minimal. (a) What is the force on the tree? (b) The length of the sturdy section of the root is only 20 cm. Furthermore, the soil around the roots is loose and we can assume that an effective force is applied at the tip of the 20 cm length. What is the effective force exerted by the end of the tip of the root to keep the tree from toppling? Assume the tree will be uprooted rather than bend. (c) What could you have done to ensure that the tree does not uproot easily?arrow_forwardBicýcle Down and Up Hill Example Wa. A Otros 1 of 20 Cons, of E E; = Es Giveni V; -10 mls Y; = 7m Part A A 63 kg person starts traveling from rest down a waterslide 7.0 m above the ground. At the bottom of the waterslide, it then curves upwards by 1.0 m above the ground such that the person is consequently launched into the air. Ignoring friction, how fast is the person moving upon leaving the waterslide? Express your answer with the appropriate units. Value Units Submit Request Answer Mostrar todos Págin Lab_Work Ener..docx a V Lab_Conserv.docx MacBook Air F10 吕口 F5 SC * & %arrow_forwardGiven that the force per unit area that may cause a bone fracture is 109 dyne/cm2,the minimum height from which a 70-kg man would jump and consequently has a fracture if he falls flat on his heels (the area of impact is 2 cm² and the impact time is 0.01 s) is: O a. 4.16 m O b. 4.16 cm O C. 41.6 cm O d. 41.6 marrow_forward
- PRINTER VERSION 1 BACK NEXT Chapter 07, Problem 038 Z Your answer is partially correct. Try again. A 1.7 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F (x) = (3.1 -x )i N, where x is in meters and the initial position of the block is x = 0. (a) What is the kinetic energy of the block as it passes through x = 2.6 m? (b) What is the maximum kinetic energy of the block between x = 0 and x = 2.6 m? (a) Number T2.6 Units (b) Number 7.3 Units Click if you would like to Show Work for this question: Open Show Work SHOW HINT LINK TO TEXT LINK TO SAMPLE PROBLEM VIDEO MINI-LECTURE Question Attempts: Unlimited SAVE FOR LATER SUBMIT ANSWER gen/shared/assignment/test/aglist.uni?id=. earch 9:35 PM ENG 4/4/2021 13) f9 home fi0end pri se %23 3 4 5 6. 8.arrow_forwardPRINTER VERSION 1 BACK NEXT Chapter 11, Problem 022 Your answer is partially correct. Try again. A particle moves through an xyz coordinate system while a force acts on the particle. When the particle has the position vector = (2.00 m) i - (3.00 m) j + (2.00 m) k, the force is F = F, i + (7.00 N) j - (6.00 N) k, and the corresponding torque about the origin is 7 = (4.00 N-m) i + (10.0 N-m)j + (11.0 N-m) k. Determine F Number Units the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work Question Attempts: Unlimited SAVE FOR LATER SUBMIT ANSWER marrow_forwardA 4.0 kg mass moving at 2 m/s and a 2 kg mass moving at 4 m/s are gliding over a frictionless surface. Both objects encounter the same horizontal force, which directly opposed their motion and are brought to rest. Which statement correctly describes the situation? a. The 2.0 kg mass travels twice as far as the 4.0 kg mass before stopping. b. The 2.0 kg mass travels farther but necessarily twice as far. c. The 4.0 kg mass travels twice as far as the 2.0 kg mass before stopping. d. The 4.0 kg mass loses more kinetic energy than the 2.0 kg mass. e. Both masses travel the same distance before stopping.arrow_forward
- PROBLEM I The 260kg crate shown in the figure rests on a horizontal surface for which the coefficient of kinetic friction is 025. If the crate is subjected to a 400 N towing force as shown determine the velocity of the crate in 5 s starting from rest PROBLEM 2 PROBLEM 3 The 80 kg block A shown in Figure is released from rest If the masses of the puleys and the cord are neglected determine the speed of the 12 kg block B in 3 s m₁ P = 400 N 6 = 30° 30⁰ SH Datum Consider the masses my 20 kg and m, 18 kg in the system represented by the figure bekow, If the coefficient of friction is OJ and the incination angle is 30°, find the acceleration of the system and the tension in the cord joining two mossCS m₂arrow_forward1. A 45.0 kg object is pushed up an incline as shown with a horizontal force of 300.0 N. The object is initially at rest but it starts moving up the incline. Find the speed of the object after 3.50 s if the coefficient of kinetic friction between the object and the incline is 0.25 and the object is still on the incline after 3.50s. 240 N I. 20.00arrow_forwardConstants A 142-g baseball is dropped from a tree 15.0 m above the ground. Part A Part B If it actually hits the ground with a speed of 9.00 m/s, what is the magnitude of the average force of air resistance exerted on it? Express your answer to three significant figures and include the appropriate units. HÁ ? Fir = Value Unitsarrow_forward
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