An 80-kg person whose surface area is 1.30 m2 worked
for one hour at a distance...
An 80-kg person whose surface area is 1.30 m2 worked
for one hour at a distance of 2.0 meters from a
spherically-symmetric source of radiation whose output power is
0.35 W. What dose (in rads) did he receive?
A person with mass m1 = 80 kg person climbs a uniform ladder
with mass m2 = 40 kg and length L = 10 m long that rests against a
vertical frictionless wall at an angle of θ = 70° with the floor.
When the person climbs 7.0 m from the base of the ladder, the
ladder starts to slip. When answering the questions, use the
symbolic notations given before using numerical substitutions.
B)Find the force of the wall Fw...
A person with mass m=80 kg is training for pushups. Assume that
the distance between the shoulders and the feet is 1.5 m, and the
center of mass is at 1 m from the feet. First, he is trying to do a
normal pushup. Assuming only vertical forces, what is the force on
the arms?After that proved to be too difficult, he tries a modified
version, where his arms are on the kitchen counter instead (~92 cm
from the ground),...
A person with mass mp=80 kg is standing at rest on a horizontal,
frictionless surface holding a ball of wet clay with mass mg=10 kg
. In front of the person is a large block with mass M=20 kg at rest
next to a spring with stiffness k=100 N/m . The person throws the
ball horizontally, it sticks to the block, and then ball and block
slide and compress the spring a distance 1=0.75 m away from
equilibrium before the...
A person with mass mp=80 kg is standing at rest on a horizontal,
frictionless surface holding a ball of wet clay with mass mg=10 kg
. In front of the person is a large block with mass M=20 kg at rest
next to a spring with stiffness k=100 N/m . The person throws the
ball horizontally, it sticks to the block, and then ball and block
slide and compress the spring a distance 1=0.75 m away from
equilibrium before the...
An 80-kg person stands at one end of a 130-kg boat. He then
walks to the other end of the boat so that the boat moves 80 cm
with respect to the bottom of the lake.
A. What is the length of the boat?
B. How much did the center of mass of the person-boat system
move when the person walked from one end to the other?
A 1.30 kg block sliding on a horizontal frictionless surface is
attached to a horizontal spring with k = 410 N/m. Let
x be the displacement of the block from the position at
which the spring is unstretched. At t = 0 the block passes
through x = 0 with a speed of 7.60 m/s in the positive
x direction. What are the (a) frequency
and (b) amplitude of the block's motion?
(a)
Number
Enter your answer for part (a)...
A rectangular box with no top is to have a surface area of
64 m2. Find the dimensions (in m) that
maximize its volume.
I got width as X= 8sqrt3/3, length y=8sqrt3/3, and height as
z=4sqr3/3 but it is wrong and I don't know why
An airplane has an effective wing surface area of 19.0 m2 that
is generating the lift force. In level flight the air speed over
the top of the wings is 55.0 m/s, while the air speed beneath the
wings is 35.0 m/s. What is the weight of the plane?
Consider a lake with 65 × 106 m2 of surface area for which the
only source of phosphorous is the effluent from a wastewater
treatment plant. The lake is receiving a flow rate of 1 m3/s from
the wastewater treatment plant, which has a phosphorous
concentration of 20 mg/L. The lake is also fed by a stream having
20 m3/s of flow with no phosphorous in it. If the phosphorous
settling rate is estimated to be 10 m/yr. (a) Write...
Question 4
The capillary surface area of a child 10 years old is 1.14 m2,
of an adult woman is 1.6 m2, and of an adult, man is 1.9 m2. The
pulmonary blood volume per area is 271 ml/m2. Capillary blood
volume varies between 20% and 25% of the pulmonary blood
volume.
a) Assuming capillaries are 8 um in diameter and have an average
length of 1 mm, calculate the range of the number of open
capillaries in the lung...