Concept explainers
Running indoors on a treadmill is slightly easier than running outside because you aren’t moving through the air and there is no drag force to oppose your motion. A 60 kg man is running at 4.5 m/s on an indoor treadmill. To experience the same intensity workout as he’d get outdoors, he tilts the treadmill at a slight angle, choosing the angle so that the component of his weight force down the ramp is the same as the missing drag force. What is the necessary angle? Use the cross-section area estimate of Example 5.14 to compute the drag force.
Want to see the full answer?
Check out a sample textbook solutionChapter 5 Solutions
College Physics: A Strategic Approach (3rd Edition)
Additional Science Textbook Solutions
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
University Physics with Modern Physics (14th Edition)
Modern Physics
Life in the Universe (4th Edition)
Essential University Physics: Volume 1 (3rd Edition)
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
- A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are μs = 0.40 and μk = 0.30, respectively. The puck's initial speed is 14.9 m/s. What speed does it have when it slides back down to its starting point?arrow_forwardA cow is pushing its baby from side of the farm to another. The floor of the farm is not frictionless. The baby has a mass of 3 kg and the cow is carefully pushing it at a constant speed of 0.5 m/s to ensure that it doesn't tip over. What is the net force acting on the baby?arrow_forwardChristian is making a Tyrolean traverse as shown in the figure. That is, he traverses a chasm by stringing a rope between a tree on one side of the chasm and a tree on the opposite side, 25 m away. The rope must sag sufficiently so it won't break. Assume the rope can provide a tension force of up to 26 kN before breaking, and use a "safety factor" of 10 (that is, the rope should only be required to undergo a tension force of 2.6 kN) at the center of the Tyrolean traverse. Figure 1 of 1 > Part A Determine the distance that the rope must sag if it is to be within its recommended safety range and Christian's mass is 72.0 kg Express your answer using two significant figures. x= Submit Part B T= VG| ΑΣΦ Submit Request Answer If the Tyrolean traverse is incorrectly set up so that the rope sags by only one-fourth the distance found in part A, determine the tension force in the rope. (Figure 1) Express your answer using two significant figures. —| ΑΣΦ ? Request Answer m ? Narrow_forward
- A 19.62 N block moving along a horizontal surface at 10 m/s is acted upon by a 5 N force of friction. The time required to bring the block to rest is approximately? The correct answer is 4 seconds.arrow_forwardThe engines of a tanker broke down and the wind pushes the ship with a constant speed of 1.5 m / s straight towards a reef. When the boat is 500 m from the reef, the wind stops and the engineer manages to start the engines. The rudder is stuck, so the only option is to try to accelerate backwards. The mass of the ship and its cargo is 3.6 x 107 kg and the engines produce a net horizontal force of 8 x 104 N. The hull can withstand impacts at a speed of 0.2 m / s or less. The retarding force that the water exerts on the hull of the ship can be neglected. a) The equation of motion that corresponds to the horizontal component is? b)The acceleration of the ship is equal to? c) If the reef does not exist, the vessel, before stopping, travels what distance?arrow_forwardA man stands on the lateral surface of a cylinder, moves his legs, and moves the cylinder with constant speed (see figure). Considering that the coefficient of friction between the shoes and the cylinder is mu = 0.3. What will be the friction force between the cylinder and the man. The mass of man m = 70 Kg.arrow_forward
- A cart for hauling ore out of a gold mine has a mass of 429 kg, including its load. The cart runs along a straight stretch of track that climbs a shallow 4.33° incline. A donkey, which is trudging along and to the side of the track, has the unenviable job of pulling the cart up the slope with a 399 N force for a distance of 113 m by means of a rope that is parallel to the slope but makes an angle of 15.1° with the track. The coefficient of friction for the cart's wheels on the track is 0.0161 Use g=9.81 m/s^2, and note that angle A in the image is the angle of the incline while angle B is the angle the rope makes with the track. Find the work ?dthat the donkey performs on the cart during this process. Find the work ?g that the force of gravity performs on the cart during this process. Calculate the work ?f done on the cart by friction during this process.arrow_forwardTry again. A 4.6 kg body is at rest on a frictionless horizontal air track when a constant horizontal force F acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in the figure. The force F is applied to the body at t = 0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force F between t = 0 and t = 1.8 s? 0.5s -1.0 s 1.5s 2.0 s 0.2 0.4 0.6 0.8 x (m) Number To.8 Units the tolerance is +/-2% 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 to search 10:33 PM ENG 4/4/2021 ASUS 13) 16 17 1ghome 3 4 R U F G トarrow_forwardA 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are us 0.40 and uk = 0.30, respectively. The puck's initial speed is 4.9 m/s. What speed does it have when it slides back down to its starting point? 2.8 m/s 4.9 m/s 4.2 m/s 3.5 m/sarrow_forward
- I need help with this problem: A 600 kg piano is being lowered into position by a crane while two people steady it with ropes pulling to the sides. Bob's rope pulls to the left, 17 degrees below the horizontal, with 420 N of tension. Ellen's rope pulls toward the right, 29 degrees below the horizontal.arrow_forwardDetermine the magnitude of the y-component of the reaction force at pin A (in kN). The beam AB is a standard 0.5 m I-beam with a mass of 95 kg per meter of length. 14 l A 0.25 m 0.5 m 0.12 m 5 m 25° 1.5 m 10 kN Barrow_forwardA student is attempting to push his stalled car out of an intersection with his girlfriend at the wheel. The car and girlfriend has a combined mass of m = 999 kg. Unfortunately the hill has an incline of θ = 3.6 degrees with respect to the horizontal. The student can supply a force of F = 883 N for t = 24 s before tiring. What is the furthest the edge of the intersection can be d in meters from the stalled car in order to make it out in one push. Assume no rolling resistance from the car and that his girlfriend brakes to bring the car to a stop when he stops pushing. I got these hints: -Start with free body diagram. Use the relationship between impulse and momentum to find the final velocity of the car after he has pushed for time t.-Use a kinematic equation to relate the final velocity and time to the distance traveled.-What is his initial velocity?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning