A balloon filled with helium gas has an average density of ρb = 0.31 kg/m3. The density of the air is about ρa = 1.23 kg/m3. The volume of the balloon is Vb = 0.075 m3. The balloon is floating upward with acceleration a.  Express the total force F in terms of W and Fb assuming upward is the positive direction.

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

A balloon filled with helium gas has an average density of ρb = 0.31 kg/m3. The density of the air is about ρa = 1.23 kg/m3. The volume of the balloon is Vb = 0.075 m3. The balloon is floating upward with acceleration a. Express the buoyant force Fb in terms of ρa and Vb.

Time left 0:31:24 An object has a volume of 3 x 104 cm³ lies at the bottom of the sea. If the force required to lift the object at a constant speed is 400 N. what is the density of the object knowing that the density of sea water is 1.025 x 103 kg/m³ a) 1358 kg/m³ b) 1692 kg/m³ c) 2025 kg/m³ d) 2358 kg/m³ O 1. a O 2. d

Assume you have 2100 spherical helium - filled balloons (neglect their mass). The diameter of each balloon is 0.4 m and the air mass density is 1.23 Kg/m. What is the maximum mass these balloons can lift by means of a massless string. O 0.033 Kg O 35 Kg O 53 Kg O 87 Kg

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/s

A soap bubble hovers motionlessly in the air. If the soap bubble's mass, including the air inside it, is 2.71 x 10¬4 kg determine the magnitude of the upward force acting on it. N

A.) When rebuilding his car's engine, a physics major must continuously exert 1.16 ✕ 102 N of force to insert a dry steel piston as it slides into a steel cylinder. What is the normal force (in N) between the piston and cylinder? (Enter the magnitude.) B.) What force (in N) would he have to continuously exert if the steel parts were oiled? (Enter the magnitude.)

Aerogels are very low density materials that contain numerous minute air-filled cavities. Including the air trapped in its microscopic pores, a certain aerogel has an average density of 2. 3 kg/m^3. A cube of this material is 5.08 cm on a side, is suspended in air (density of 1.2 kg/m^3) by a vertical string. What is the tension in the string? a. 1.4 x 10^-4 N b. 1.8 x 10^-3 N c. 2.1 x 10^4 N d. 1.4 x 10^-3 N

On a perfect fall day, you are hovering at rest at low altitude in a hot-air balloon. The total weight of the balloon, including its load and the hot air in it, is 18000 N  Find the volume of the displaced air V =