After trying to push the heavy barrel up the ramp, the man decides to use a shorter ramp leading up to the landing. Will this make it easier or more difficult to roll the barrel up the ramp? Explain.A) More difficult because the steeper slope requires more effort force to overcome gravity. B) More difficult because the barrel's mass will increase. C) Less difficult because the steeper slope requires less effort force to overcome gravity. D) Less difficult because the effect of the earth's gravity on the barrel will decrease.

e) Figure Q4b shows a pulley system suspended by a hook and a bolt fixed to the ceiling. The pulley system is used to lift a load (FL) of 250 N when an effort force (FE) is applied. Determine the tension force in each support rope, the effort force (FE) and reaction force (FR) necessary to lift and hold a load of 250 N. *Assume that the pulley system is weightless and frictionless. FR +3 www FE d₂ d₁ ↑ FL Figure Q4b (Illustrative and not to scale) f) Calculate the ideal mechanical advantage (IMA) for the pulley system in Figure Q4b and calculate the distance d₁ moved when distance d₂ is 1.75 m.

A student measures the ANGLE of the incline to be TOO SMALL. How will this effect the student's value of the coefficient of kinetic friction? The value will be too large The value will be too small The value will be unchanged

8:19 y & 9 2 • Part III. Friction 1. Click on "Friction" 2. Select the checkboxes: Forces, Sum of Forces, Values, Masses and Speed. Keep the knob that regulates the friction at the center of the scale. V Forces Sum of Forces Values Masses V Speed Friction None Lots 3. Start to push the box, increasing the force applied on the box slowly. There is a force that is opposite to the force you are applying. What is the name of the force opposing to the motion? 4. Once the box start moving, the magnitude of the resultant force increase instantaneously. How do you explain that? 5. Push the box and find the force needed to make the box to start moving. Add more mass (box, kid, man, refrigerator, basket as needed) and repeat the procedure such that you complete the table below. Hint: Weight = mass x gravity Magnitude of Normal Force = Maanitude of ||

1. A pulley device is used to hurl projectiles from a ramp (mk = 0.26) as illustrated in the diagram. The 5.0-kg mass is accelerated from rest at the bottom of the 4.0 m long ramp by a falling 20.0-kg mass suspended over a frictionless pulley. Just as the 5.0-kg mass reaches the top of the ramp, it detaches from the rope (neglect the mass of the rope) and becomes projected from the ramp. %3D 4.0 m H =026 5.0 kg 30 60m 20.0 kg a. Determine the acceleration of the 5.0-kg mass along the ramp. (Provide free-body diagrams for both masses.) b. Determine the tension in the rope during the acceleration of the 5.0-kg mass along the ramp. c. Determine the speed of projection of the 5.0-kg mass from the top of the ramp. d. Determine the horizontal range of the 5.0-kg mass from the base of the ramp. Use the grasp method to determine the answer

OO O O ABC * Question 4 A screw driver acts as a lever when used to open a paint can, If Juan applies a force of 25 N to the handle of the screwdriver. What mechanical advantage does the screwdriver provide if it applies a force of 350 N to the lid? 0.08 14 325 375 O Time Remaining: 1 hour, 7 minutes Ozu Iluminate EducationTM Inc. O9 0 12:41 C esc backs & # $ % 9. @ 7 8. 3 4 2

5. What is the main drawback of using Rotary-Wing UAVS? a.They have limited flight endurance and range b.They have complex systems c.They need a runway for take-off and landing d.They are difficult to build 6. Which of the following statements about Quadrotor UAVS are CORRECT? i.The common configurations of quadrotor UAVS are X' and +' configurations. ii.They have six degrees of freedom from three translational and three rotational motions. iii.We could use Left Hand Rule to determine the direction of a motion iv.They are underactuated systems. a.i, ii b.i, ii, ii c.i, ii, iv d.ii, i, iv

lili Thu 8:42 PM %99 A A SvU - Document3 AutoSave OFF Insert Draw Design Layout > Tell me A Share Ca Home Verdana B IUv ab X, x A e Av Paragraph Styles Dictate Paste The triceps muscle in the back of the upper arm extends the forearm. This muscle in a professional boxer exerts a force of 2.00 X 103 N with an effective perpendicular lever arm of 2.80 cm, producing an angular acceleration of the forearm of 165 rad/s?. What is the moment of inertia, in kg • m2, of the boxer's forearm? Page 1 of 1 59 words LY Focus - 三 |

6. A loop-the-loop machine has radius r = 18m. (a) Calculate the minimum speed with which a cart must enter the loop so that it does not fall off at the highest point (Draw a free body diagram for the cart at the highest point of the loop). (b) Predict the speed at the top in this case.