The skateboarder now wants to show off his final trick. This involves the skateboarder starting at the top of a straight metal track that is 10 m long, inclined at an angle of 30o above the horizontal. The coefficient of friction between the skateboard and the metal track is 0.4. i. Draw a free body diagram of the skateboarder on the inclined track. ii. Determine the velocity of the skateboarder at the bottom of the track...

The skateboarder now wants to show off his final trick. This involves the skateboarder starting at the top of a straight metal track that is 10 m long, inclined at an angle of 30o above the horizontal. The coefficient of friction between the skateboard and the metal track is 0.4. i. Draw a free body diagram of the skateboarder on the inclined track. ii. Determine the velocity of the skateboarder at the bottom of the track...

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 72AP: Two small forces, F1=2.40i6.10tj N and F2=8.50i9.70j N , are exerted on a rogue asteroid by a pair...

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As shown, the pulleys and the cord are light, all surfaces are frictionless, and the cord does not stretch. (a) How does the acceleration of block 1 compare with the acceleration of block 2? Explain your reasoning. (b) Themass of block 2 is 1.30 kg. Find its acceleration as it depends on the mass m1 of block 1. (c) What If? What does the result of part (b) predict if m1 is very much less than 1.30 kg? (d) What does the result of part (b) predict if m1 approaches infinity? (e) In this last case, what is the tension in the cord? (f) Could you anticipate the answers to parts (c), (d), and (e) without first doing part (b)? Explain.
Two small forces, F1=2.40i6.10tj N and F2=8.50i9.70j N , are exerted on a rogue asteroid by a pair of space tractors. (a) Find the net force. (b) What are the magnitude and direction of the net force? (c) If the mass of the asteroid is 125 kg, what acceleration does it experience (in vector form)? (d) What are the magnitude and direction of the acceleration?
A student’s backpack, full of textbooks, is hung from a spring scale attached to the ceiling of an elevator. When the elevator is accelerating downward at 3.8m/s2 , the scale reads 60 N. (a) What Is the mass of the backpack? (b) What does the scale read if the elevator moves upward while speeding up at a rate 3.8m/s2 ? (c) What does the scale read if the elevator moves upward at constant velocity? (d) If the elevator had no brakes and the cable supporting it were to break loose so that the elevator could fall freely, what would the spring scale read?
Now the contestant pulls the 45-kg block of ice across the frozen lake with a rope over his shoulder as shown in the figure. The maximum coefficient of static friction between the block and ice is μs= 0.1, and the coefficient of kinetic friction is μk= 0.03. θ= 25° as shown. d) Calculate the minimum force F that must be exerted to get the block moving. e) What is the acceleration of the block once it starts to move if the force from part (d) is maintained?
What does the graph of the force of the ground on the runner’s foot look like? b. Explain why there are two peaks. c. How can the force on the runner’s foot be greater than their body weight? (Hint: draw a free body diagram and focus on the forces in the vertical direction)
A 50kg rocket launched from the ground accelerates upwards at 15m/s2.a. What is the upwards force from the rocket’s engines? (recommend drawing the FBD first)b. It is launched from the ground. How fast will it be going after 7 seconds?c. What will be the height of the rocket at the 7 second point?
Imagine holding a 25kg dumbbell in your hand. a) What force must you exert on the dumbbell to hold it still? b) What force must you exert on the dumbbell to keep it moving upward at constant velocity?
(a) Draw the free body diagrams of ?1, ?2 and block ?.(b) Determine the acceleration vectors of all mobile bodies in the situation where they are always in contact as shown in Fig .1.(c) Calculate the normal reaction forces on block ? and ?1; tension in the string and contact force between block ? and ?2.
A block with mass m = 7 kg is pushed with a force of = 50 N. Please answer F1 the following: A. Draw a body diagram representing all forces acting on the block. B. If the coefficient of static friction is = 0.4, does the block move? C. The block now starts moving, if the coefficient of kinetic friction is =0.1 μk find .Fk D. Find the acceleration. E. After t = 3 s , how far did the block move? (the initial position and initial Xi velocity are both zero)Vi F. What is the velocity at t= 3 s ?
A block is pushed by the force 40N and the friction force between the surface and block is 10 N . Then a)find the net force on a block ? b) if the mass of the block is 7kg then acceleration of the block ?
At the instant a race began, a 65-kg sprinter exerted a force of 720 N on the starting block at a 22o angle with respect to the ground. (a) What was the horizontal acceleration of the sprinter? (b) If the force was exerted for 0.32 s, with what speed did the spinter leave the starting block?
A block weighing 300 N is moved at a constant speed over a horizontal surface by a force of 50 N applied parallel to the surface. What does the “constant speed” tell you about the forces acting on the block? I) What is the coefficient of kinetic friction (μk)? II) What is the mass of the block? III) What would be the acceleration of the block if μk = 0?