Discuss Bacterial cell walls with regard to (a) resistance to phagocytosis, (b) chemical composition,
and (c) decolorization by alcohol.
Phagocytosis is a process by which phagocytes engulf, or destroy, material and particles in cells.
Leukocytes, or whit
1.
2.
Why does a baseball catchers mitt have more padding than a conventional glove?
If you place a box on an inclined plane, it gains momentum as it lectures down. What is
responsible for this change in momentum?
A baseball catchers mitt is designed to p
Conduction is known as the transfer of heat (or electricity) from one place to another, the transfer
occurs as energy through atoms which move and vibrate against each other. Objects can be
conductors of heat, and depending on the free or loose electrons
If you toss a coin straight upward while riding in a train, where does the coin land when the motion
of the train is uniform along a straight-line track?
Galileo asserts, in absence of a force, a moving object will continue moving [Hew15]. If you toss a
c
Discuss, and make a comparison of, pollution by conventional fossil-fuel power plants and nuclearfission power plants. Consider thermal pollution, chemical pollution, and radioactive pollution.
Nuclear-fission is often viewed as a negative and dangerous r
According to our textbook, a rapidly spinning star shows red-shifted light from the side turning
away from us and blue-shifted light from the side turning toward us [Hew15]. Blue-shifted light
indicates the increased frequency and the red-shifted light in
When we look at a submerged object in water, our perception is that the object is closer to the
surface of the water than it actually is, due to refraction. Refraction causes an illusion with objects in
water, such as when a stick is seen and it is not co
Discuss the three rules that make an object sink or float. How can a fish swim deep in water or float
to the surface as it wishes?
In terms of buoyancy, there are three rules that determine an objects ability to sink or swim.
First, an object more dense t
The technique used by a simple lie detector consisting of an electric circuit, is supposed to
indicate that a person is lying if the electric current changes. The theory is that the bodys
reactions from telling the lie will lower the electrical resistance
55 Chapter 9, Problem 50 Bookmark Show all steps: (n :5
Step-by-step solution
Step 1 of 1 A
Answer:
< Accotding w 11: law of canservalicm of momentum, The total momentum of an isolated >
system of object remains constant. NEXT
Letusconsiduthewmandshasasys
55 Chapter 9, Problem 8P [1 Bookmark Show all steps: (n :
Step 1 of3 A
The speed of air (v) = 120 kmfh
< = [120 x %]mls >
=33,33m/s
The density of air (3):12cglm3
Area of the building (A) = (45m) (65m)
Step 20f3 A
In a time dz, all of the air within a dis
55 Chapter 2, Problem 71GP a Bookmark Show all steps: (m- ;:
Step 1 of2 A
The acceleration due to gravity on the moon is g = g the value of g on Earth,
Step 20f2 A
We assume the same initial velocity on the Moon and Earth.
.At the highest point, the final
55 Chapter 9, Problem 4P [1 Bookmark Show all steps: (n :
Step-by-step solution
Step 1 of2 A
The mass ofthe particle = m
< The force on the particle (F) = 26i 12tj >
Fis varyingfrom t= 1.0 s to t=2.0 5
Step 20f2 A
In terms of momentum, Newtons Second Law
55 Chapter 9, Problem 7P a Bookmark Show all steps: (m- ;:
Step 2 of 2 A
SOLUTION
The final velocity
v = .wtan 5
From the law of conservation of momentum, initial linear momentum is equal to nal
linear momentum
Pu. =Pm
Rocket initial velocity is u = 0 , s
55 Chapter 2, Problem 7SGP Bookmark Show all steps: @ ;:
Step 1 of3 A
APPROACH:
< By using the simple kinematics equation v2 =v:+2a(xxo)we can approach the >
solution for the given problem. Here vois the initial speed of the car, vis nal speed of the
cany
EE Chapter 9, Problem 3P a Bookmark Show all steps: (n ;:
Step-by-step solution
Step 1 of2 A
The momentum of the particle is P = 4.8t2i-8,0j-8.9Ik
NEXT
Step 2 of 2 A
In terms of momentum, Newton's Second Law can be written as
Fons FEE
d!
i 4.8-8.0j-8.9zk
55 Chapter 3, Problem 29P [1 Bookmark Show all steps: (n g:
In vertical direction
Initial height is y, = 0
Final height ofrock (y) = 75m
Acceleration is (a)= g
Time taken to reach the water is (t) = 3.05
In horizontal direction
Initial velocity of driver
55 Chapter 3, Problem 32P Bookmark Show all steps: @ ;:
Step 1 of 2 A
APPROACH:
. . . . . 1 2 A2:
< By usmg Simple kinematics equations y = y0 +vyo +ayt and V: = Twe >
can nd the initial speed of the ball.
Step 2 of 2 A
SOLUTION:
Let the origin is at the
55 Chapter 9, Problem 70 [1 Bookmark Show a slepsi (n :
Step-by-step solution
Step 1 all A
The magnitude of momentum change is the same for both the small car and the truck.
< From Newton's 3"! Law, the force exerted on the truck by the ear, FCpl' and the
55 Chapter 9, Problem 6P [1 Bookmark Show all steps: (n :
Step 3 of 4 A
The average force on the ball is,
17:
Substitute (26.746 run/s); for v, (32.0 m/s)(.) for 60, ans kg for m, and 25 ms for N.
0.l45 kg(26.746 m/s)j'(32.o m/s)(i)
4
2.5 ms[lo 5)
1 ms
=(
Chapter 2, Problem 70GP
D Bookmark
(5.0 m/s)! =%(1.2 mils):2 [-.- from equations (1) and (2)]
1
5.0 m/s = 5(12 ails):
_ 2(5.om/s)
- 2
1.2 m/s
=8.33 5
Comment
Step Sofa A
For fugitive, time taken to reach his nal velocity is 5.0 3. But time required to cat
55 Chapter 9, Problem 6P a Bookmark Show all steps: (In. ;:
Step-by-step solution
Step 1 0M A
Use law of conservation of energy to find the velocity of the ball. Later use the formula for the
< average force to calculate the average force on the ball. >
N
55 Chapter 9, Problem 28F a Bookmark Show all steps: (n ;:
Step 1 of4 A
Mass of the tennis ball (m) = 0,060 kg.
Step 2 of 4 A
300
m4) 200
100
0
0.05 am
I0)
Comment
Step 3 of 4 A
(a) The impulse = afea under the F- t curve.
Area of each block =50N><0.0ls.
55 Chapter 9, Problem 40 [1 Bookmark Show all steps: (n :
Step-by-step solution
Step 1 of 2 A
Solution:
< Impulse: It is the product of average force applied and time interval. It is also equal to the >
change in momentum of the body. NEXT
Step 2 of 2 A
D
Chapter 3, Problem 31 P
D Bookmark
Show all steps: (n
I!
3
Comment
Step 4 of 6 A
The same range of 2 m can be obtained from another angle. That is,
0 = 90- [8
= 72
Comment
Step 5 of 6 A
Therefore, there will be two angles which will give the
55 Chapter 2, Problem 75613 a Bookmark Show all steps: (m- ;:
2g
_ (13.89 mls)
' 2(930 mls)
=9.84 m
~-
Step 4 of 4 A
(t)
From the part (a) we got the result as the nal velocity of the car as it hits the yound
when it is dropped from a height H is v = .f2g
Chapter 9, Problem 10
<
Step-by-step solution
Step 1 of2 A
Salado 11:
Law of conservation of momentum: In the absence of external force, the total
momentum of a system remains constant.
Step 2 of 2 A
Momentum is conserved in the absence of a net external
55 Chapter 2, Problem 7SGP a Bookmark Show all steps: m3
Step1 of4 A
APPROACH:
< By using the equation 122 = v: +2a(yyo)we can approach the solution for the given >
problem, Here vuis the initial speed of the car,vis nal speed of the car, yuis the initial
55 Chapter 2, Problem 74GP a Bookmark Show austeps: (ID 3:
Step 1 of4 A
Height above the water (11) = 16m
< Reaction time (t) = 0.20 s >
Step 2 of 4 A
We use a coordinate system with the origin at the top of the water and the upward
direction as positive.
55 Chapter 3, Problem 35P Bookmark Show all steps: (n g:
. . . l 2
We have a kinematics equation yyo = (+5!
I
Ea, +vony=0
This is a quadratic equation and the roots of equation give the value of time.
2 1
vyo i V 4 50 (-y)
1
2(5 (1,]
-8.05m/s:l: ,l(8.05m/