A body of mass 2.0 kg is experiencing air resistance and is observed to fall with an acceleration of 9.2 m/s2. The opposite force of air on the body is: 18.4 N 1.2 N none of the given choices 19.6 N zero
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- ▷ > The horizontal Velocity of wind against sail = 5.7 m/s. along the front surface, 3.2 m/s back surface. Find the magnitude at net force (in N) with area of one square meter. Density of air = 1,29 ing/m3 ▷ D DUnderwater, you can just barely lift a 75.0 kg rock (density 3.20 g/cm3 ). How massive a rock could you lift on dry land?The force needed to maintain a constant velocity of 0.8 m/s on air track is found to be 0.005 N. The area of the cart is 0.05 m2. If the viscosity of air is 1.8 x 10$ Pa s, the thickness Ay (in meter) of the air layer equals a) 1.08 x 104 b) 7.2 x 10 c) 1.44 x 104 d) 5.4 x 10s
- The drag force, Fa, imposed by the surrounding air on a vehicle moving with velocity Vis given by Fa Ca ApV²/2 where Ca is a constant called the drag coefficient, A is the projected frontal area of the vehicle, and p is the air density. An automobile is moving at V = 40 miles per hour with C = 0.28, A = 24 ft², and p = 0.075 lb/ft³. Determine the force, in lbf, and the power, in hp, required to overcome aerodynamic drag.A car with two passengers and fuel weighs 1000 kg. It has wings with an area of 16 m^2 that are designed such that air moving over them must travel 1.05 times as far as air moving under them. How fast must this plane be moving so that wings generate enough lift to offset the plane's weight? The wings are thick. Please give answer in m/sA 15kg STEEL BALL IS SUSPENDED AT THE AIR USING 2 DIFFERENT TYPES OF CABLES. CABLE A IS MADE UP OF BRONZE WHILE CABLE B IS MADE UP OF STEEL CALCULATE THE TENSION IN ROPE A AND ROPE B (15 kg 53°
- A box is lowered using a rope. If the acceleration of the box, is 5.7 m/s2 (downward) and its mass is 23.1 kg, what is the magnitude of the tension in the rope? (in N) OA: 60.8 OB: 76.0 OC: 94.9 OD: 118.7 OE: 148.3 OF: 185.4 OG: 231.8 OH: 289.7An object of mass 125 kg is released from rest from a boat into the water and allowed to sink. While gravity is pulling 1 the object down, a buoyancy force of times the weight of the object is pushing the object up (weight = mg). If we 40 assume that water resistance exerts a force on the object that is proportional to the velocity of the object, with proportionality constant 10 N-sec/m, find the equation of motion of the object. After how many seconds will the velocity of the object be 40 m/sec? Assume that the acceleration due to gravity is 9.81 m/sec². dv First write Newton's law m = m dv = F(t,v) in terms of the given data. dtA ballon is being pushed upwards by the force of the hot air inside it. If the ballon has a mass of 250 kg, how much force is needed to accelerate it upwards at 0.3 m/s^2? (This question was already answered, don't answer)The balloon from the other question is getting too high. You grab a rope hanging from it and pull it down. Using the same conditions and information, how hard would you have to pull on it to bring it back down at a constant speed? (answer this one)
- The leaves of a tree lose water to the atmosphere via the process of transpiration. A particular tree loses water at the rate of 3.0 x 108 m/s. What mass of water is lost over the course of a single day? (Use 1000 kg/m³ for the density of water). |kg This water is replenished by the upward flow of sap through vessels in the tree's trunk. If the trunk contains about 1900 vessels, each 0.1 mm in diameter, what is the speed of the sap flowing in the vessels? mm/sThe frontal surface area of a cyclist has been measured as 0.8 m2. Knowing that the coefficient of air resistance is 0.6 and the density of the air is 1.29 kg/m3, calculate the horizontal force that the cyclist has to apply via the pedals to ride at 40 km/h.The drag force, D, on a plate moving with a velocity of (40.0 ± 0.2) km/h through air of density p = ( 1.200 ±0.010) kg/m3, with a surface area of (100.00 ± 0.5mm) x (30.00 ± 0.05cm) is given by D = Cd p AV² where Ca= 2.1 is a non-dimensional constant. What is the drag force D? 30.00 cm 100.00mm O D = 9.33 ± 0.233 N D = 8.9±0.2kg D =0.89±0.22 N D = 9.33 ± 2.33 x 101 N D = 9.3 ± 0.2 N