To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater. It is found that she weighs 690 NN when weighed in air and 40.0 NN when weighed underwater. What is her average density?

A rock, which weighs 1400 N in air, has an apparent weight of 900 N when submerged in fresh water (998 kg/m3). The volume of the rock is: O 0.14 m3 O 0.50 m3 O 0.90 m3 O 5.1 x 10-2 m³ O 9.2 x 10-2 m³

A spherical balloon has a radius of 6.35 m and is filled with helium. The density of helium is 0.179 kg/m3, and the density of air is 1.29 kg/m3. The skin and structure of the balloon has a mass of 990 kg . Neglect the buoyant force on the cargo volume itself. Determine the largest mass of cargo the balloon can lift.

Problem 4: Water flows through a water hose at a rate of Q1 = 660 cm/s, the diameter of the hose is d = 2.13 cm. A nozzle is attached to the water hose. The water leaves the nozzle at a velocity of v = 11.6 m/s. Part (a) Enter an expression for the cross-sectional area of the hose, A1, in terms of its diameter, dj. A1 = 7 8 9 HOME A1 d 4 5 di g h 1 2. 3 P Q1 END m t V1 V2 vol BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Part (b) Calculate the numerical value of A1, in square centimeters. Part (c) Enter an expression for the speed of the water in the hose, v1, in terms of the volume flow rate O, and cross-sectional area A1. Part (d) Calculate the speed of the water in the hose, vị in meters per second. Part (e) Enter an expression for the cross-sectional area of the nozzle, A2, in terms of vị, v2 and A1. Part (f) Calculate the cross-sectional area of the nozzle, A2 in square centimeters.

A helium weather balloon is initially tethered by a rope to the ground. The balloon has a diameter of 3.5 m and the mass of the balloon and helium inside is 8 kg. Given that the density of the surrounding air is 1.25 kg/m3, determine the tension in the rope.

An object made of iron appears 300 N lighter in water than in air. The density of iron is equal to 7870 kgm-3 , and the density of water is 1000 kgm-3 . a) What is the volume of the object? b) What is the object’s weight in air?

Problem 05: Soda can A 355 ml soda can is 6.2 cm in diameter and has a mass of 20 g. Such a soda can half full of water is floating upright in a swimming pool. What length of the can is above the water level in the pool? Problem 06: Force on aquarium window

Part A: The human body typically contains 4.9 L of blood of density 1060 kg/m^3 . How many kilograms of blood are in the body? Part B: The average blood pressure is 1.30×104 Pa at the heart. What average force does the blood exert on each square centimeter of the heart? Part C: Red blood cells have a specific gravity of 5.0 and a diameter of about 7.5 μm. If they are spherical in shape (which is not quite true), what is the mass of such a cell?

To verify her suspicion that a rock specimen is hollow, a geologist weighs the specimen in air and in water. She finds that the specimen weighs twice as much in air as it does in water. The density of the solid part of the specimen is 2.02 × 103 kg/m3. What fraction of the specimen’s apparent volume is solid?

The pulmonary artery, which connects the heart to the lungs, has an inner radius of 2.60 mm and a length of 8.40 cm. If the drop in pressure between the heart and the lungs is 4.0 hPa. a) What is the average speed of the blood in the pulmonary artery?