A fishnet consists of 1 mm diameter strings which form a pattern of 1 cm x 1 cm squares. Estimate he drag to pull a square meter of net at 3 m/s normal to its plane. Treat each string as independent from the others O 926 N O 1500 N 300 M 400 N
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- Calculate the ratio of the drag force on a jet flying at 890 km/h at an altitude of 11 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.32 kg/m3 at 11 km and 0.64 kg/m3 at 5.5 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.(a) A sphere made of wood has a density of 0.810 g/cm3 and a radius of 7.50 cm. It falls through air of density 1.20 kg/m3 and has a drag coefficient of 0.500. What is its terminal speed (in m/s)? m/s (b) From what height (in m) would the sphere have to be dropped to reach this speed if it fell without air resistance? Read It Need Help?Suppose you have a 100-kg box full of books resting on a wood floor, with coefficient of static friction 0.500 between these surfaces. A force is applied at an angle of 30° with respect to the horizontal, as shown. M (a) What is the minimum force would you need to exert on the box to get it to move? (b) If you continue to exert this force once the box starts to slip, what will be its acceleration? The coefficient of sliding friction is known to be 0.300 for this situation.
- What is the tension in the cable? Assume the density of the water is 1030 kg/m^3A helium balloon floats at the end of a string. The net force (the bouyancy force minus the weight) on the balloon is 33 N. If the tension in the string exceeds 54 N of force, the string will break. How great a force can a horizontal wind exert on the balloon before the string breaks?The seed pods of maple trees, also known as "helicopter seeds," spin as they fall, generating a leading edge vortex at the outer edge of each wing-like seed pod. This effect, similar to the vortices generated by hummingbird wings, can generate a sufficient lift force to keep the seed floating in air, allowing it to be dispersed by the wind. The figure below shows a pair of maple seeds L = 3.40 cm in length, with an angle of 70.0⁰ separating the seeds, as shown. If the outer edge of the seeds must rotate with a speed of 1.25 m/s for sufficient lift to be generated, what is the centripetal acceleration of the outer edge of the seeds (in m/s²) as they fall? (Enter the magnitude. Assume the seeds are symmetric about the vertical axis as they fall, as in the figure.) =
- Needs Complete typed solution with 100 % accuracy.The forces on an aircraft flying at altitude are shown in the picture. An F35 fighter jet has a mass m = 14,000 kg and its engines are capable of a maximum thrust TMAX = 190,000 N. (a) At a cruising speed of 250 m/s the air drag is 40,000 N. What is the maximum forward acceleration that the F35 can achieve? (b) This aircraft’s wings have a total cross-sectional area of 43 m2. What is the pressure difference between the upper and lower side of the wings required for the aircraft to fly at constant altitude? (Hint: the vertical forces must cancel.)A pulley is attached to one end of a rough plank, which makes an angle of 34◦ with the horizontal. A box is held at rest on the plank by a string that is attached to the box and passes over the pulley. A bucket of water is attached to the other end of the string and hangs freely. The coefficient of static friction between the plank and the box is 0.8. The box remains at rest but is on the point of slipping up the plank. The bucket of water has mass 7.5 kg.Name the four forces acting upon the box and draw a force diagram showing them, including the angles that show their directions.
- A box weighing 1000 N is sitting in an inclined plane with an angle of 45°. Given the coefficient of friction of 0.25, calculate the horizontal force that can start the box the moving forward.Asap plzzzMany birds can attain very high speeds when diving. Using radar, scientists measured the altitude of a barn swallow in a vertical dive; it dropped 208 m in 3.0 s. The mass of the swallow was estimated to be 0.018 kg, and its cross-section area as 5.6 x 10-4 m2. What was the drag coefficient for this swallow as it dove?