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BIO A Leafhopper's Leap The motion of jumping insects is of interest not only to biologists, but also to those who design robots Figure 5-46 shows the speed versus time graph for two different takeoff jumps of a 19-mg green leafhopper as determined from high-speed videos. (a) What is the magnitude of the average net force acting on the leafhopper’s body during jump 1? (b) What is the ratio of the force found m part (a) to the leafhopper s weight? (c) Is the average force during jump 2 greater than, less than, or equal to the average force during jump 1? Explain
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- You and a friend are on a road trip when your car runs out of gas only 20 meters from a gas station fortunately you're in Montana so the road is perfectly horizontal. You put the car in neutral and apply a horizontal force of 455 N, while your friend applies a horizontal force of 585 N in the same direction. The cars mass is m= 1600kg. The car begins to move, and you push the car to the pump. The car started from rest when you and your friend began pushing. Ignore all friction and air resistance what was the work done in the first 3 seconds of the trip?arrow_forwardYou and a friend are on a road trip when your car runs out of gas only 20 meters from a gas station fortunately you're in Montana so the road is perfectly horizontal. You put the car in neutral and apply a horizontal force of 455 N, while your friend applies a horizontal force of 585 N in the same direction. The cars mass is m= 1600kg. The car begins to move, and you push the car to the pump. The car started from rest when you and your friend began pushing. Ignore all friction and air resistance What is the total force applied? what is the work done by your friend over the trip to the gas station? what is the kinetic energy of your car 3 seconds after the start of your trip to the gas station? what was the work done in the first 3 seconds of the trip?arrow_forwardAn 876 N jumper lands on the floor with a velocity of 6.4 m/s. Assuming no force absorption, calculate the force of landing if he stops in: a) 1/100 s, b)1/4 s, c) What is the relationship of these different forces and injury risk of the athlete? Biomechanically (physically) what will you ask the jumper to do to decrease their injury risk?arrow_forward
- Bicýcle 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_forwardThe 250-lb concrete block A is released from rest in the position shown and pulls the 400 lb log up the 30' ramp. Plot the velocity of the block as it hits the ground at B as a function of the coefficient of kinetic friction u, between the log and the ramp. Let ux vary between 0 and 1. Why does the computer not plot results for the entire range specified? 400lb 250lb A 30 deg 20' Hints: -- Model the system as a dependent motion analysis and derive acceleration equations in terms of the unknown quantities -- Use MATLAB to solve this system of equations (you'll need one equation for each unknown!) -- Define uk as a range in MATLAB from 0 to 0 in 0.01 increments -- Plot the function of the velocity for the block as it hits the groundarrow_forward1) A bartender slides a mug of beer with mass 0.2 kg down a smooth, level bar. The mug leaves the bartender's hand at an initial velocity of 2.8m/s. As the mug slides, it slows down due to the effect of friction between the mug and bar. The mug just comes to rest in the customer’s hand 1.0 m away from the bartender. Calculate the magnitude and direction of the frictional force acting on the mugarrow_forward
- PROBLEMI 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 38 m₁ P = 400 N IIA 8 = 30° 30° Consider the masses m, 20 kg and m, 18 kg in the system represented by the figure below. If the coefficient of friction is Of and the inclination angle is 30°, find the acceleration of the system and the tension in the cord joining two masses Datum m₂arrow_forwardPRINTER 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_forwardUsing an everyday example, explain a situation where friction is detrimental. In your answer specify the type of friction involved and how it acts in a detrimental manner.arrow_forward
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