# A 61 kg person has an apparent mass of 46 kg (because of buoyancy) when standing in water that comes up to the hips. Estimate the mass of each leg. Assume the body has SG = 1.00

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### physics

A person weights 685 N in air but only 497 N when standing in water up to the hips. Find (a) the volume of each of the person’s legs and (b) the mass of each leg, assuming they have a density that is 1.05 times the density of water.

### Physics

A 70 kg person is having a tug-of-war. The rope is horizontal and 1.3 m above the ground. This person’s center of mass is 1.0 m from the ground when he is in an upright standing position. If the force his opponent exerts on the rope is 400 N, what angle must the person be ...

### Physics

Jane is sitting on a chair with her lower leg at a 30.0° angle with respect to the vertical. You need to develop a computer model of her leg to assist in some medical research. If you assume that her leg can be modeled as two uniform cylinders, one with mass M1 = 17 kg and ...

### physics

A particular person’s lower leg is 59 cm long and has a mass of 8.0 kg. If allowed to swing freely, with what time period would the leg swing? (Treat the leg as a simple pendulum with length equal to half the leg length and all the leg’s mass concentrated at this point.)

### Physics

Jane is sitting on a chair with her lower leg at a 30.0° angle with respect to the vertical, as shown. You need to develop a computer model of her leg to assist in some medical research. If you assume that her leg can be modeled as two uniform cylinders, one with mass M1 = 17...

### physics

Estimate the change in gravitational potential energy when a person with mass 95kg rise from bed to a standing position. Assuming that the center of mass of a person is elevated by approximately Δh=0.50m.

### physics

cant find much on how to solve problems like these. any help would be appreciated. A pressure of 6000 Pa is exerted on a wall of 12 square meters area. What force is exerted on the wall? What is the pressure at the bottom of a 50 m tall water tower? What is the pressure at the...

### POETRY

Discuss what functions of poetic writing the author of this poem is using? What is the poem expressing? Who is the speaker? Auditor? What is the rhyme scheme? Meter? Homage to my hips These hips are big hips they need space to move around in. They don't fit in little pretty ...

### college physics

From what maximum height can a 61 kg person jump without breaking the lower leg bone of either leg? Ignore air resistance and assume the CM of the person moves a distance of 0.65 m from the standing to the seated position (that is, in breaking the fall). Assume the breaking ...

### physics

a person of mass 80 kg standing on a boat of mass 320 kg which at rest in still water the person is initially 12m from the shore the person walk on boat for 6 sec with a constant speed 1 m/s toward the shore and then stop distance of the person from the shore finally

### physics help please!!!

From what maximum height can a 61 kg person jump without breaking the lower leg bone of either leg? Ignore air resistance and assume the CM of the person moves a distance of 0.65 m from the standing to the seated position (that is, in breaking the fall). Assume the breaking ...

### Physics

A Hospital patient has injured her leg, how much mass must be used to keep her leg stationary. The leg has a mass of 2.6 kg and is 0.87 meters in length, the rope for the tension mass is connected at 0.65 meters from the knee.

### Physics

A Hospital patient has injured her leg, how much mass must be used to keep her leg stationary. The leg has a mass of 2.6 kg and is 0.87 meters in length, the rope for the tension mass is connected at 0.65 meters from the knee.

### physics

PERIOD OF THE LEG The period of the leg can be approximated by treating the leg as a physical pendulum, with a period of 2pi*sqrt(I/mgh), where I is the moment of inertia, m is the mass, and h is the distance from the pivot point to the center of mass. The leg can be ...

### physics

A person of mass M lies on the floor doing leg raises. His leg is 0.85m long and pivots at the hip. Treat his legs (including feet) as uniform cylinders, with both legs comprising 34.5% of body mass, and the rest of his body as a uniform cylinder comprising the rest of his ...

### Physics

When standing erect a person's weight is supported chiefly by the larger of the two leg bones. Assuming this bone to be a hollow cylinder of 2.5 cm internal diameter and 3.5 cm external diameter, what is the compressive stress on the bone (in each leg) in the case of a person ...

### physics

one cubic meter of water hass a mass of 1.0x10^-3. (a) determine the mass of 1.0 m^3. (b) assu!ing biological substance are 98% water, estimate the mass of cell with a 1.0 micrometer dia!eter, a human kidney and a fly. assume a kidney is roughly a sphere with radius of 4.0 cm...

### physics

Calculate the mass needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 14.0 , and its CG is 34.0 from the hip joint; the sling is 81.5 from the hip joint.

### physics-torque

A person is doing leg lifts with 3.0-kg ankle weights. She is sitting in a chair with her legs bent at a right angle initially. The quadriceps muscles are attached to the patella via a tendon; the patella is connected to the tibia by the patellar tendon, which attaches to bone...

### AP Physics - Equilibrium

The Achilles tendon is attached to the rear of the foot as shown in the figure below. When a person elevates himself just barely off the floor on the ball of one foot, estimate the tension Ft in the Achilles tendon (pulling upward) and the (downward) force Fb exerted by the ...

### physics

A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 89.0 kg, the mass of the skateboard is 4.10 kg, and the mass of the brick is 2.50 kg. If the person throws the brick forward (in the direction ...

### Physics

Leg traction is applied to a patient's leg as shown in the figure below. If the physician has requested a 57 N force to be applied to the leg, and the angle is θ = 60o , what mass m must be used for the object hanging from the massless cable? So < represents angle ...

### physics

A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the person is 87.0 kg, the mass of the skateboard is 4.10 kg, and the mass of the brick is 2.50 kg. If the person throws the brick forward (in the direction ...

### physic angular momentum and torque

Calculate the mass m needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 15.5kg , and its CG is 35.5cm from the hip joint; the sling is 76.5cm from the hip joint.

### physics

What is likely identity of a metal, if a sample has a mass of 67.5g when measured in air and an apparent mass of 59.5g when submerged in water?

### Physic

Calculate the mass m needed in order to suspend the leg shown in the figure(Figure 1) . Assume the leg (with cast) has a mass of 15.5kg , and its CG is 35.5cm from the hip joint; the sling is 76.5cm from the hip joint.

### AP Physics - Linear Momentum

During a Chicago storm, winds can whip horizontally at speeds of 100 km/h. If the air strikes a person at the rate of 40 kg/s per square meter and is brought to rest, estimate the force of the wind on a person. Assume the person is 1.50m high and 0.50m wide. Compare to the ...

### physics

A person of mass 60 kg is standing on a raft of mass 40kg in a lake. The distance of a person from bank is 30m. If a person starts running towards bank with velocity 10m/s then his distance from bank after 1s will be ?? And explain with diagram and proper steps

### physics

Persons A and B are standing on a board of uniform linear density that is balanced on two supports, as shown in the figure. What is the maximum distance x from the right end of the board at which person A can stand without tipping the board? Treat persons A and B as point ...

### Physics

Estimate the number of h20 molecules in a human body of mass 80.2 kg. Assume that, on average, water makes up about 62 % of the mass of a human body.

### Physics

An exceptional standing jump would raise a person 0.90 m off the ground. To do this, what force must a person of mass 66 kg exert against the ground? Assume the person crouches a distance of 0.20 m prior to jumping, and thus the upward force has this distance to act before he ...

### Tech Math

A 490 newton woman stands on a bathroom scale while riding in a elevator that is accelerating downward at 2m/sec/sec. Find her apparent weight and her apparent mass. Compare to her starting mass.

### physics

One cubic centimetre (1.0 cm3) of water has a mass of 1.0 × 10−3 kg. (a) Determine the mass of 1.0 litre of water. Assuming that biological substances are 98% water, estimate the masses of (b) a cell with a diameter of 1.0 μm, (c) a human kidney, and (d) a fly. ...

### physics

If a person weighs 700N on Earth, what force due to gravity would they exert on a 1500kg car they are standing 1.5m from? Assume the distance is between their centres of mass. F=Gm1xm2/r^2?

### physics

A geologist finds that a Moon rock whose mass is 9.97 kg has an apparent mass of 6.40 kg when submerged in water. What is the density of the rock?

### Physics

A balloon carrying a basket is descendign with a constant acceleration of g/3. the total mass of the basket and contents is mB.you see water below and decide you need to throuw out some mass to allow the basket to rise and not hit the water. how much mass should you throw out ...

### Physics

What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 9.38 g when measured in air and an apparent mass of 8.55 g when submerged in water? A)Copper B)Iron or steel C)Aluminum D) Lead E)Concrete F)Gold

### Physics Archimedes buoyancy lab

In calculating the density of a heavy solid. The string holding the heavy solid will cause error. specific gravity= (mass object in air)/ (mass object in air- mass object in water) = density When does it lead to an experimental density that is too high? Too low? not sure...

### chemistry

cold water mass of calimeter+ water: 68.66g mass of calimeter: 19.19g mass of water: 49.47g final temperature of water: 39.1C initial temperature of water: 25.5C delta(T) of water: 13.6C hot water mass of calimeter+ water: 79.55g mass of calimeter: 20.61g mass of water: 58.94g...

### physics

Suppose all the people of the Earth go to the North Pole and, on a signal, all jump straight up. Estimate the recoil speed of the Earth. The mass of the Earth is 6 1024 kg, and there are about 6 billion people (6 109). Take the average mass of a person to be 74 kg and the ...

### Science

A diver standing on the diving board has a mass of 89.0 kg and has a gravitational potential energy of 2.50 x 103 J. Determine how high the diver is above the water surface. (Assume the water is at ground level).Use 9.81 m/s2 as the value for gravity.

### physics

a 50 kg person is standing on mercury. mercury's mass is .0553 times the earths mass and has a radius of 2439 kilometers a. what is the persons weight on saturn b. what is the persons mass on saturn how do i solve this, i don't need the answers, just an explanation

### Physics

A variation Russel traction supports the lower leg in a cast. suppose that the patient's leg and cast have a combined mass of 15.0kg and m1 is 4.50kg. (a) what is reaction force of the leg muscles to the traction? (b) what must m2 be to keep the leg horizontal?

### Chemistry

How much salt could an average person hold? (Ignore safety concerns) Given equation: 0.3x=y 0.3x meaning mass of water y mean mass of salt that could be dissolved in the given mass of water Assuming the average human body has 60-75% of water, let us just use 75% Solve.

### physics

A man of mass 60kg standing inside a lift with an acceleration of 2m/s(square).Find the apparent weight that a man feels(g is 10).

### Physics

A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle θ due to a massive mountain. A) Make an estimate of the mass of Mt. Everest, assuming it has the shape of a cone 3910 m high and base of diameter 3910 m. Assume its mass per unit volume ...

### Kennard Dale

Estimate what the value of G would need to be if you could actually "feel" yourself gravitationally attracted to someone near you. Assume that each person has a mass of 72 kg, the force of attraction is F = 4 N, and the distance of separation is 0.5 m.

### Physics

The Achilles tendon is attached to the rear of the foot. Assume that a person has a mass of 53 kg and that D is twice as long as d. When a person elevates himself just barely off the floor on the "ball of one foot," estimate the tension in the Achilles tendon (pulling upward).

### Chemistry

What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 16.0 g when measured in air and an apparent mass of 15.2 g when submerged in water? Which of the following is it? -copper -gold -lead -aluminum -iron or steal -concrete (Note: Can only select...

### Physics

A hollow plastic spherical bobber of mass 0.005 kg and volume of 50 cm3 floats on the surface of a lake supporting a submersed fishhook and a bait with a combined mass of 0.01 kg and a combined volume of 2 cm3. The density of water is 0.001 kg/cm3. If a fish grabs the bait, ...

### physics

Bird bones have air pockets in them to reduce their weight–this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 43.0 g and its apparent mass ...

### Physics

The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find the tension FT in the Achilles tendon (pulling...

### science

this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total volume doesn’t change when salt is added to ...

### physics

a 2.0 kg solid mass has an apparent weight 12.34N when totally immersed in water. Calculate the apparent weight of the body when totally immersed in a liquid of density 0.78

### phsyics

A young girl sits at the edge of a dock by the bay, dipping her feet in the water. At the instant shown in the figure , she holds her lower leg stationary with her quadriceps muscle at an angle of 39 degree with respect to the horizontal. Use the information given in the ...

### Chemistry

When 10.00g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2990g of water from 18.0 ∘C to 38.0 ∘C. Calculate the heat of formation of P4O10(s) under these conditions. -------------------------------------- ...

### Physics

Leg traction is applied to a patient's leg. If the physician requested a 32N force to be applied to the leg, and the angle is 60 degrees, what mass m must be used for the object hanging from the massless cable?

### physics

38. A rock of mass 0.400 kg is released from the surface and sinks in the ocean. As the rock descends it is acted upon by three forces: gravity, buoyancy, and drag. The buoyancy is an upward force equal to half its weight. Drag from the water can be modeled by F = kv, where k...

### physics

a ball of mass of 4kg,of density 4000kg/m3 is completely immersed in water of density 1000kg/m3.find the force of buoyancy.[g=10m/s2]

### Physics

John’s mass is 81.0 kg, and Barbara’s is 62.4 kg. He is standing on the x axis at xJ = +9.41 m, while she is standing on the x axis at xB = +4.34 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch? Distance ...

### physics

Consider a 1kg mass at rest at the equator.Because of the earths rotation , the mass experiences a centripetal acceleration. a)Draw free body diagram of mass b)Find centripetal force acting in the mass c)Compare apparent weight and true weight d)what fictitious force would the...

### Physics

A Ferris Wheel, 24.0 m in diameter, rotates once every 12.5s. What is the fractional change in a person's apparent weight: a) at the top, and b) at the bottom? I need to know if I'm doing this right. Here's my work: Equation Used: Net Force = [(4(pi)^2)(R)(M)] / [T^2] M=mass T...

### physics

Consider Joule's experiment described in the insight below. Assume the mass m = 2.3 kg and the fluid is water with a volume of 1.75 L. What is the increase in the temperature of the water when the mass moves vertically a distance z = 1.55 m?

### Physics

19. Two people of unequal mass are initially standing still on the ice with negligible friction. They then simultaneously push each other horizontally. Afterward, which of the following is true? * -The center of mass of the two person system moves in the direction of the less ...

### physics

Water is poured into a container that has a leak.The mass 'm' of the water is given as a function of time 't' by, m=5t^0.8 -3t + 20 , with t>=0, mass in grams and t in seconds A) at what time is the water mass greatest,and B) what is the greatest mass? In kilogram per ...

### physics

A submerged submarine alters its buoyancy so that it initially accelerates upward at 0.325 m/s^2. What is the submarine's average density at this time? (Hint: the density of sea water is 1.025*10^3 kg/m^3). The difference of densities will give you the net bouyant force on the...

### chem/phys

Calculate the number of H2O molecules in a human body of mass 66.5 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.) 1

### Chem

A Texas Aggie buys 12 cans of dehydrated water. The cans weigh an average of 63.46g each before the dehydrated water is removed. If the density of pure distilled water is 0.9979 g/mL and each can has a volume of 3.154L, what is the total mass of the cans AFTER the removal of ...

### physics

Calculate the number of H2O molecules in a human body of mass 50.6 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.)

### Physics

Calculate the number of H2O molecules in a human body of mass 65.9 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.)

### math statistics

Convert Ken's chest, waist, and hips measurements to z-scores. Which of these measures appears to be the most different from kens reference group(human males)? Justify with an appropriate statistical argument. Ken's chest=75.0,waist=56.5,hips=72.0 Human x-bar chest is 91.2,...

### Physic

A person weighs 872 N in air and has a body fat percentage of 20.7%. a. What is the overall density of this person's body? b. What is the volume of this person's body? c. Find the apparent weight of this person when completely submerged in water.

### Physica

Had this question answered answered before but I could not understand the explanation. Can someone else please help me? What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 9.38 g when measured in air and an apparent mass of 8.55 g when ...

### PHYSICS

Fish achieve neutral buoyancy (so they don't have to swim constantly to stay in place) via a swim bladder. A swim bladder is a little internal sack that they can inflate/deflate with air, which changes their volume but not their total mass. To see how this allows them to ...

### College Physics

A person of mass 65.0 kg is standing on the floor of an elevator. The elevator is accelerating upward at 1.50 m/sec2. What does the person weigh?

### Physics

A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 220 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +3.5 m/s relative to the shore, and then hops onto an identical floating log that is ...

### Physics

A person of mass 65.0 kg is standing on the floor of an elevator. The elevator is accelerating upward at 1.50 m/sec2. What resultant force acts on the person?

### physics

find the apparent weight of a 18 cm by 12 cm by 6 cm block of concrete with a mass of 1.82 kg that is submerged under water.

### physics

Proponents of astrology claim that the positions of the planets at the time of a baby's birth will affect the life of that person in important ways. Some assert that this effect is due to gravity. Examine this claim with Newton's law of gravity. Calculate the maximum force ...

### Physics

Buoyancy. A Team of 6 scouts plan to cross a lake on a raft they designed. The dimensions of each plank is 30 cm x 30 cm x 3m. The density of the wooden planks is of .80. The average mass of the members is 65KG. And for their safety they want the top of the raft to be 3 cm ...

### physics

A copper container of mass 100g contains 500g of water. A steel paddle of mass 85g stirs the water. A pulley system operates the paddle. A) the mass (15kg) drops 2,4m, turning the steel paddle. Assume heat lost to surrounding is negligible. 1. Find the energy transfered to the...

### physics

Suppose that it takes exactly 17.0 hr to drain a container of 6.20 liters of water. What is the average mass flow rate (in kilograms/second) of water from the container? Assume that the density (mass/volume) of water is exactly 1 g/cm^3.

### physics

Severe stresses can be produced in the joints by jogging on hard surfaces or with insufficiently padded shoes.If the downward velocity of the leg is 7.3m/s when the joggers foot hits the ground. If the leg stops in a distance of 1.1 cm. Calculate the force on the ankle joint. ...

### atomic energy test question

38. A body having a mass 0.1 kg was weighed suspended in water and its mass was noted to be 88.5 gram. What will be the volume of the body? [Assume density of water to be 1.00 g/ cm3]

### physics

A person is standing on a spring bathroom scale on the floor of an elevator which is moving up and slowing down at the rate of 1.53 m/s 2 . The acceleration of gravity is 9.8 m/s 2 . If the person’s mass is 83.4 kg, what does the scale read?

### Chemistry

I'm sorry But I'm still so badly stuck and I don't get it Initial mass of candle 40.3g Mass of tin calorimeter 41.1g Mass of half-filled calorimeter with water 220.4g Initial temp of water 18.8°C Final temp of water 26.6°C Final mass of candle 38.2g Calculate heat of ...

### physics

A 640 N student stands on a bathroom scale in an elebator. As the elevator starts moving, the scale reads 800 N. a) find the acceleration of the elevator (magnitude and direction) b) acceleration if the scale reads 450N? c) If the scale reads 0 should the student worry? ...

### physic

Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 4.5000 kg when weighed in air.

### Physics

Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 1.6000kg when weighed in air.

### physics

A new type of spring is found where the spring force F is given by F=-kx + bx^2 where k=400 N/ m and b=100 N/m^2 and x is the expansion (or compression) of the spring from its equilibrium position. The spring is attached to a point mass of 1 kg sitting on a horizontal ...

### chem

A small sterling silver braclet has a mass of 76.0g and a volume of 7.33ml(by water displacement) Calculate the mass and % Ag and the mass and % Cu in the braclet. Assume the volumes to be linerly additive. density of Ag= 10.5 g/ml;density of Cu=8.96 g/ml.

### Chemistry

Commercial bleach contains 5.25% (by mass) of NaClO in water. It has a density of 1.08 g/mL. Calculate the molarity of this solution. (Hints: assume you have 1 L of solution (mass 1080 g); molar mass of NaClO is 74.4 g/mol)

### physics pls help

The resilin in the body of a flea has a force constant of about 28 kg, and when the flea cocks its jumping legs, the resilin associated with each leg is stretched by approximately 0.10 mm. Part A Given that the flea has a mass of 0.56 mg, and that two legs are used in a jump, ...

### Chemistry

mass of empty flask with stopper = 32.634 g mass of flask with water and stopper = 59.479 g density of the water = 0.9973 g/cm^3 mass of water = 26.845 g volume of water = 26.918 cm^3 the flask is then emptied and an unknown substance is added mass of flask with new liquid and...

### physics

A person jumps off a diving board 4.6 m above the water's surface into a deep pool. The person's downward motion stops 1.6 m below the surface of the water. Estimate the average deceleration (magnitude) of the person while under the water.

### Physics

A person is standing on a spring bathroom scale on the ﬂoor of an elevator which is moving up and slowing down at the rate of 2.73 m/s^2. The acceleration of gravity is 9.8 m/s^2. If the person’s mass is 75.2 kg, what does the scale read? Answer in units of n

### physics - leg cast

The leg and cast in the figure below weigh 280 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 105 N. Determine the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.

### College Algebra 2

The number of kilograms of water in the human body varies dirctly as the mass of the body. An 84-kg person contains 64-kg of water. How many kg of water is in a 63-kg person?

### physics

Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 4.8t^0.8 - 2.9t + 21, with t ≥ 0, m in grams, and t in seconds. (a) At what time is the water mass greatest, and (b) what is that greatest mass? In kilograms...