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- A uniform 25kg bar, 6.0m long is suspended by a cord shown. What is the tension in the cord? wall cord 27° -6.0 m- 3.7 x 102 N 02.7 x 10² N 1.2 x 10² N 5.4 x 10² NRunning on a treadmill is slightly easier than running outside because there is no drag force to work against. Suppose a 60 kg runner completes a 5.0 km race in 15 minutes. Determine the drag force on the runner during the race. Suppose that the cross-section area of the runner is 0.72 m2. What is this force as a fraction of the runner's weight?A speedboat with a mass of 505 kg (including the driver) is tethered to a fixed buoy by a strong 29.7 m cable. The boat's owner loves high speed, but does not really want to go anywhere. So the owner revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. When the tension of the cable is steady at 12300 N, with what force is the boat's engine pushing the boat? Different physics textbooks treat drag force somewhat differently and use different formulas. For the present purpose, take the water's drag force on the boat to be (450 kg/m) × v², where v denotes the boat's speed. Ignore any drag force on the cable. force: N & TOOLS x10
- A speedboat with a mass of 545 kg545 kg (including the driver) is tethered to a fixed buoy by a strong 32.7 m32.7 m cable. The boat's owner loves high speed, but does not really want to go anywhere. So the owner revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. When the tension of the cable is steady at 13700 N,13700 N, with what force is the boat's engine pushing the boat? Different physics textbooks treat drag force somewhat differently and use different formulas. For the present purpose, take the water's drag force on the boat to be (450 kg/m)×?2,(450 kg/m)×v2, where ?v denotes the boat's speed. Ignore any drag force on the cable.The towers holding small wind turbines are often raised and lowered for easy servicing of the turbine. (Figure 1) shows a 900 kg wind turbine mounted on the end of a 24-m-long, 700 kg tower that connects to a support column at a pivot. A piston connected 3.0 m from the pivot applies the force needed to raise or lower the tower. At the instant shown, the wind turbine is being raised at a very slow, constant speed. Figure 75° [[5] 10° 1 of 1 What magnitude force is the piston applying? Express your answer with the appropriate units. Fp= = Submit HÅ Value Provide Feedback Request Answer Units ?A tutor told me that the answer to 1b was 10N but I don't understand why it would be 10N for the tension. If that is correct could someone break it down for me?
- As of 2008, 42 people have survived a fall from a height above 10,000 feet without a parachute. Without air resistance, a person would hit the ground with a speed of 240 m/s (540 mph)However, by placing your body in a skydiving position (see photo)you can maximize your cross-sectional area and take advantage of the drag force to limit your speed. In this positionyour terminal speed will only be 54 m/s (120 mph)This is still a high rate of speed. Just imagine being in an automobile accident at 120 mph! Nevertheless, there is a higher probability of survival, depending upon what you land on. Afterall, it is not the fall that will kill you, but the impact. you strike concrete at 54 m/s, we will say nice things about you at your funeralYou can take comfort in the fact that you won't even feel Contrary to popular belief, hitting water at this speed is not much betterYour body will have to displace and compress the water as you enter it. But water, and most liquids, are difficult to…In 2014, the Rosetta space probe reached the comet Churyumov– Gerasimenko. Although the comet’s core is actually far from spherical, in this problem we’ll model it as a sphere with a mass of 1.0 x 1013 kg and a radius of 1.6 km. If a rock were dropped from a height of 1.0 m above the comet’s surface, how long would it take to hit the surface?A spherical raindrop of mass 0.0128 g and radius 1.45 mm falls from a cloud that is at a height of 1139 m above the ground. Assume the drag coefficient for the raindrop is 0.60 and the density of the air is 1.3 kg/m3. What is the raindrop's terminal speed? And what would the raindrop's speed just before landing on the ground if therewere no drag force (no air resistance)?
- If an object weighs 3 x 105 N on the surface of the earth, what would its weight be at an altitude of 400 km above the surface of the earth?Two uniform spheres are positioned as shown. Determine the gravitational force F which the titanium sphere exerts on the copper sphere. The value of R is 55 mm. Copper 1.9 R 3.4 R x i+ i j) (108) N R Titanium Answer: F = (i 27° --A 0.50-kg ball that is tied to the end of a 1.3-m light cord is revolved in a horizontal plane, with the cord making a 30° angle with the vertical. (a) Determine the ball's speed. (b) If, instead, the ball is revolved so that its speed is 3.5 m/s, what angle does the cord make with the vertical? (c) If the cord can withstand a maximum tension of 9.2 N, what is the highest speed at which the ball can move?