ringShow Transcribed TextPart Af=HÅA 72.5 kg skater moving initially at 2.40 m/s onrough horizontal ice comes to rest uniformly in3.52 s due to friction from the ice.What force does friction exert on the skater?Express your answer with the appropriate units. Enter positive value if the direction of the force is the same asthat of the initial velocity of the skater and negative value if the direction of the force is opposite.ValueUnitsGBINO ?Submit Previous Answers Request AnswerOX Incorrect; Try Again; 2 attempts remaining

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I Review | Constants A stockroom worker pushes a box with mass 11.6 kg on a horizontal surface with a constant speed of 3.40 m/s. The coefficient of kinetic Part A friction between the box and the surface is 0.21. What horizontal force must the worker apply to maintain the motion? Express your answer with the appropriate units. F = 24 N Submit Previous Answers v Correct Part B If the force calculated in the previous part is removed, how far does the box slide before coming to rest? Express your answer with the appropriate units. µA ? Value Units Submit Request Answer
Block Bin the figure weighs 756 N. The coefficient of static friction between block and table is O.24; angle 0 is 33°; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary. Knot - A. Number i Units
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Part A A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1200 N and the angle between the two ropes is 24.0 °. How hard must each player pull to drag the coach at a steady 1.90 m/s ? Assume both players pull with the same force. Express your answer with the appropriate units. HÁ T = Value Units Submit Request Answer
Part C A block of mass 2 kg is acted upon by two forces: 3 N (directed to the left) and 4 N (directed to the right). What can you say about the block's motion? View Available Hint(s) It must be moving to the left. It must be moving to the right. It must be at rest. OIt could be moving to the left, moving to the right, or be instantaneously at rest. Submit Part D A massive block is being pulled along a horizontal frictionless surface by a constant horizontal force. The block must be ► View Available Hint(s) continuously changing direction moving at constant velocity moving with a constant nonzero acceleration moving with continuously increasing acceleration Submit
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Part A The coefficient of kinetic friction between the40-kg crate and the ground is u = 0.3. The crate starts from rest, and P = 200 N . (Figure 1) Determine the velocity of the crate when t = 2s. Express your answer to three significant figures and include the appropriate units. HA 画]? Value Units Figure 1 of 1 Submit Request Answer Part B Determine the distance the crate travels when 2 s. 30° Express your answer to three significant figures and include the appropriate units. µA 国]? S = Value Units Submit Request Answer
In researching the forces that act on flying birds, scientists studied the motion of cockatiels' bodies as they fiy in horizontal flight. As the birds beat their wings, their bodies move up and down. (Figure 1) shows the vertical acceleration of a cockatiel's body during one wing beat, consisting of an upstroke followed by a downstroke. Part A If the bird's mass is 82 g. what is the maximum net vertical force exerted on the bird? Express your answer with the appropriate units. F= 2,1 N Submit Previous Answers v Correct Figure Part B a, (m/s?) 50- The bird is held in level flight due to the force exerted on it by the air as the bird beats its wings. What is the maximum value of this force due to the air? Note that the bird's weight, the force of gravity acting on it, is calculated using w mg. a result that will be justified in Chapter 5. Express your answer with the appropriate units. t(s) 0.02 0.06 0.08 0.10 HA ? -50- (Fair)max = Value Upstroke Downstroke Submit Previous Answers…
Part C What is the magnitude FCont of the force that the car exerts on the truck? Use the coordinate system shown in Part B, where upward is the positive y direction and to the right, the direction F ConT points, is the positive x direction. Express your answer in newtons to three significant figures. ► View Available Hint(s) FConT = Submit ΜΠΙ ΑΣΦ ? N
4.3 Newton's Second Law of Motion A 25.0-g arrow traveling at 60.0 m/s hits a target and penetrates 15.0 cm before coming to rest. The archer now uses a different arrow and fires it with the same speed. This arrow penetrates 10.0 cm before coming to rest, and we can assume the same frictional force in both cases. What is the mass of the second arrow? i g Hint Save for Later Submit Answer 6.D

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