Answer:
354
Explanation:
A Or b
Question in picture
Answer:
the answer to the question is indeed B
You desire to observe details of the Statue of Freedom, the sculpture by Thomas Crawford that is the crowning feature of the dome of the United States Capitol in Washington, D.C. For this purpose, you construct a refracting telescope, using as its objective a lens with focal length 86.3 cm. In order to acheive an angular magnification of magnitude 5.01, what focal length fe should the eyepiece have?
Answer:
the focal length of the eyepiece is 17.23 cm
Explanation:
The computation of the focal length of the eyepiece is shown below:
= Focal length of objective lens ÷ angular magnification magnitude
= 86.3 ÷ -5.01
= 17.23 cm
Hence, the focal length of the eyepiece is 17.23 cm
We simply divided the angular magnification magnitude from the focal length of objective lens so that the focal length of the eyepiece could come
5. During a heat transfer investigation, students filled two cups with water. One cup contains 100mL of cold water while the other contains 100 mL of hot water.
A metal heat wire is placed inside the water of both cups and thermometers are attached to each cup. Which of the following BEST explains how the heat is transferred? Cold Water Hot Water.
A. This investigation would not result in any heat being transferred.
B. Convection, because the metal wire was heated through convection currents.
C. Radiation, because the metal wire was heated by electromagnetic waves.
D. Conduction, because the metal wire was in direct contact with water in both containers.
Answer:
D.Conduction, because the metal wire was in direct contact with water in both containers
Conduction, because the metal wire was in direct contact with water in both containers. Option D is correct.
Given that,
Students filled two cups with water. One cup contains 100mL of cold water while the other has 100 mL of hot water. A metal heat wire is placed inside the water of both cups and thermometers are attached to each cup.
It is to be identified, the system contains which type of heat transfer between the cups
Heat transfer is the process, in a thermodynamic system, when an object at a higher temperature is placed with an object at has a lower temperature, after some time the system attains equilibrium because heat flows from higher temperature to lower temperature.
In the given question,
Cups, that are connected through a metal wire, one is hot and the other is cold, Principal of conduction state that when there is a system of connected bodies the heat flows throughout the connected system till the thermal equilibrium attain. Implies heat flow from hot cup to cold cup through the wire through conduction heat transfer.
Thus, Conduction, because the metal wire was in direct contact with water in both containers. Option D is correct.
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A cell membrane consists of an inner and outer wall separated by a distance of approximately 10nm10nm. Assume that the walls act like a parallel plate capacitor, each with a charge density of 10−5C/m2, and the outer wall is positively charged. Although unrealistic, assume that the space between cell walls is filled with air.
1. What is the magnitude of the electric field between the membranes?
A. 1×10^−15N/C
B. 5×10^−5N/C
C. 1×10^6N/C
D. 9×10^−2N/C
2. What is the magnitude of the force on a Ca++ ion between the cell walls?
A. 4×10^−13N
B. 4×10^−12N
C. 2×10^−12N
D. 2×10^−11N
3. What is the potential difference between the cell walls?
A. 1×10^7V
B. 1×10^−2V
C. 6×10^−3V
D. 10V
4. What is the direction of the electric field between the walls?
A. Toward the outer wall.
B. Parallel to the walls.
C. Toward the inner wall.
D. There is no electric field.
5. If released from the inner wall, what would be the kinetic energy of a 3fC charge at the outer wall? 1fC=10^−15C.
A. 3×10^−14J
B. 3×10^−17J
C. 3×10^−8J
D. 3×10^−2J
Answer:
the correct answue are B, A, C, C, B
Explanation:
1) The electric field is requested, let's approximate the membrane by a parallel plate with surface charge density
E = [tex]\frac{\sigma }{2 \epsilon_o }[/tex]
E = [tex]\frac{ 10^{-5}}{2 \ 8.85 \ 10^{-12}}[/tex]
E = 5.65 10⁵ N / C
the correct answer is B
2) A calcium ion has two positive charges, so the force applied by each side of the membrane (plate)
F = q E
F = 2 1.6 10⁻¹⁹ 5.65 10⁵
F = 1.8 10⁻¹³ N
the total force is the sum of the force of each membrane and the two forces go to the same side
F = total = 2 F
F_total = 3.6 10⁻¹³ N
the correct answer is A
3) the field and the electric potential are related
ΔV = - E s
ΔV = - 5.65 10⁵ 10 10⁻⁹
ΔV = - 5.65 10⁻³ V
the correct answer is C
4) In the exercise they indicate that the outer wall has a positive charge, therefore, as they indicate that we approximate the system to a capacitor, the inner wall must be negatively charged.
The electric field goes from the positive to the negative charge, which is why it goes from the outer wall to the inner wall
the correct answer is C
5) For this part we use conservation of energy
starting point. On the inside wall, brown
Em₀ = U = qV
final point. On the outside
Em_f = K
energy is conserved
Em₀ = Em_f
q V = K
K = 3 10⁻¹⁵ 5.65 10⁻³
K = 1.7 10⁻¹⁷ J
the correct answer is B
Free use of uniforms and socialization with classmates are possible advantages of ? A.)
dual sports B.)community-based sports programs C.)individual sports D.) school-based sports programs
Answer:
its d
Explanation:
Question 2 of 10
Which type(s) of radiation can damage living cells?
O A. Beta particles and gamma rays only
O B. Alpha particles, beta particles, and gamma rays
O C. Gamma rays only
D. Alpha particles and gamma rays only
The type of radiation which can damage the living cells are the X-rays, beta particles, and the gamma rays. Thus, the correct option is A.
What are damaging radiations?Radiations have been found to damage the DNA molecules present in the cells. High doses of the radiation damage the cell and these radiations could lead to Acute Radiation Syndrome (ARS) or Cutaneous Radiation Injuries (CRI). High doses of these radiation could also lead to formation of tumor and cancer later in the life.
Gamma rays are the most harmful external hazard or radiations among all the radiations and these result into acute effects. Beta particles are also harmful to the cell because these can partially penetrate the skin, causing beta burns in the skin. Alpha particles cannot penetrate the intact skin. Gamma and x-rays can pass through a person which results into damaging cells in their path.
Therefore, the correct option is A.
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How is the L-section filter useful at both low and high frequencies?
Answer: High pass filters, and in particular LC high pass filters are used in many RF applications where they block the lower frequencies and allow through higher frequency signals. Typically LC filters are used for the higher radio frequencies where active filters are not so manageable, and inductors more appropriate.
Answer:
high pass filters and in particular LC high pass filter are used in many RF application where they block the lower frequencies and allow through higher frequency signals. Typically LC filters are used for the higher radio frequencies where active filters are not so manageable and indicators more appropriate
A Newtonian fluid with a viscosity drains through the space between two large parallel plates as shown in the figure. The gap distance between the plates is 2b. Obtain relations for the shear stress distribution, shear stress at the walls, velocity profile and volumetric flow rate assuming laminar flow and negligible end effects. You can begin the derivations by considering that vz=vz(x) only and pressure at the inlet and outlet is atmospheric.
Answer:
well
Explanation:
basically it's like
A star that is one of the coolest,
about 3,200°C, is going to be which
of the following colors?
Resourcos
A. greenish
Help
B. bluish
C. yellowish
D. reddish
It is measured that 3/4 of a body's volume is submerged in oil of density 800kg/m³
Complete question:
It is measured that 3/4 of a body's volume is submerged in oil of density 800kg/m³. What is the specific gravity of oil?
Answer:
The specific gravity of the oil is 0.8.
Explanation:
Given;
density of the oil, [tex]\rho_o[/tex] = 800 kg/m³
density of water, [tex]\rho_w[/tex] = 1000 kg/m³
The specific gravity of any substance is the ratio of the substance density to the density of water.
Specific gravity of the oil = density of the oil / density of water
Specific gravity of the oil = 800/1000
Specific gravity of the oil = 0.8
Therefore, the specific gravity of the oil is 0.8.
An electron with an initial speed of 700,000 m/sm/s is brought to rest by an electric field. Did the electron move into a region of higher potential or lower potential?
Answer:
lower potential
Explanation:
Given that,
An electron with an initial speed of 700,000 m/s is brought to rest by an electric field. The electric field is defined as the electric force per unit charge. The electron must go in the opposite direction to get to the rest. It would imply that the electron would move in a region of lower potential.
HELP!!
An electric motor is used to lift an elevator and
occupants (mass = 1.50 x 10kg) to a helght of
15.0 m in 30.0 s at a constant velocity. What is
the power output of the motor? I know the answer I just need someone to show me the steps so I understand how to solve this
Answer: (7.35 x 10^3 W)
Answer:
[tex]P=7.35\times 10^{3}\ W[/tex]
Explanation:
Given that,
Mass, [tex]m=1.5\times 10^2\ kg[/tex]
It lifts to a height of 15 m in 3 s
We need to find the power of the motor. The formula for power is given by :
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{1.5\times 10^2\times 9.8\times 15}{3}\\\\P=7.35\times 10^{3}\ W[/tex]
So, the power of the motor is equal to [tex]7.35\times 10^{3}\ W[/tex].
If a = 30 cm, b = 20 cm, q = +2.0 nC, and Q = –3.0 nC in the figure, what is the magnetude of the potential difference between A and B is
The magnitude of the potential difference between A and B is 195 V.
Potential of charge A
The potential of charge A is calculated as follows;
Va = kq/r
where;
k is Coulomb's constantq is magnitude of the charger is the position of the chargeVa = (9 x 10⁹ x 2 x 10⁻⁹) / (0.3)
Va = 60 Volts
Potential of charge BVb = kq/r
Vb = (9 x 10⁹ x -3 x 10⁻⁹) / (0.2)
Vb = -135 Volts
Potential between A and BVAB = VB - VA
VAB = -135 V - 60 V
VAB = -195 V
Thus, the magnitude of the potential difference between A and B is 195 V.
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PLEASE HELP
A problem says a plane is accelerating
3.42 m/s2 northeast. Which one of these
tables includes that information correctly?
Answer:
The answer is C, I just guessed and got it right lol
Explanation:
Which of the following is an example of charging by friction?
Answer: where is the examples?
Explanation:
Why is Alternating Current important
Explanation:
La corriente alterna es de gran importancia, entre otras cosas, porque nos proporciona la red eléctrica domiciliaria. Es aquella con la cual funcionan habitualmente los transformadores y un gran número de dispositivos.
PLEASE HELP!!! WILL GIVE 30 POINTS!! HAS TO BE CORRECT!
The picture below shows a solar event in the sun's atmosphere.
Which of these events is most likely to occur as a result of the solar event pictured above?
Disruption to electricity power grid
Less aurora activity at the poles
The sun's photosphere would be blocked
The sun's magnetic effect would decrease
Answer:
the answer is A . Disruption to electricity power grid :)
Explanation:
Linda, a biker, is moving along a circular path at a constant speed of 10 km/h. In a neighboring arena Kevin, another biker, is moving along a circular path at a constant speed of 12 km/h. If the acceleration of the two bikers is the same, what can you infer?
A) The centripetal force on Kevin is higher than that on Linda.
B) The centripetal force on Linda is higher than that on Kevin.
C) Kevin’s circular path has a bigger radius than Linda’s path.
D) Linda’s circular path has a bigger radius than Kevin’s path
Answer:
the answer is C
Explanation:
i took the test just now so i am glad i can help someone in the future❣❣❣❣
Also here is the explanation
Note that the magnitude of acceleration (a) is given by a =
v2
R
, where v is the speed and R is the radius. Because acceleration is the same for both bikers, the ratio 
v2
R
, also has to be the same for both. Given that Kevin’s speed is higher, the radius of his path must also be higher to maintain the same ratio. Therefore, Kevin’s circular path has a bigger radius than Linda’s path.
When carbon bonds with oxygen,
what
gas is formed?
When carbon bonds with oxygen, what gas is formed?
Answer:
Carbon dioxide
Explination:
I remember it from biology.
I hope this helps ^-^
In a chemical reaction, carbon combines with oxygen to form carbon dioxide gas.
What is a chemical reaction?A chemical reaction can be defined as a process that causes the chemical transformation of one chemical substance to another. The chemical reactions accompany chemical changes that involve the rearrangement of electrons in the forming and breaking of bonds between atoms, with no change to the nuclei.
The substances which are primarily involved in a reaction are known as reactants or reagents. Chemical reactions are commonly characterized by a chemical change, and yield products, which exhibit properties different from the reactants.
Chemical reactions take place at a characteristic rate of reaction at a given temperature, pressure, and chemical concentration. The rates increase with the increasing temperature of the reaction when more thermal energy is available to achieve the activation energy for breaking bonds between atoms.
The combustion reaction takes place when carbon combines with oxygen to produce carbon dioxide gas.
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A basketball is at rest on the floor. It is heated with a Bunsen burner to make it warmer. A student argues
that the thermal energy in the basketball could be converted to kinetic energy and the basketball will
spontaneously move upwards. This claim violates which law of nature?
Answer:
Newton's first law of motion - The law of inertia
Explanation:
The student's claim violates Newton's first law of motion which states that a body will continue in its state of rest or uniform motion except a force is applied to change that state of rest or uniform motion.
In the case of the student, no external force is applied to the basketball, so as to change its inertia, so it continues to stay in the same position. But, the student assumes that the kinetic energy of the ball will change as its thermal energy can be converted to kinetic energy.
This is incorrect because, the thermal energy only raises the temperature of the basketball and thus the energy of the molecules of the ball, it cannot cause the kinetic energy of the basketball to change since it applies NO FORCE to be basketball so as to change its inertia.
I've got this question, which option is correct?
Answer:
option c is the correct one
According to Newton, which of these will determine if and how an object will move?
1. how much energy the object has
2. how unstable the object is
3. whether a net force acts on the object
4. he total mass of the object
Answer:
3
Explanation:
Answer:
whether a net force acts on the object
Types of RM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays, and gamma rays.
True
False
Answer:
True
Explanation:
The electromagnetic spectrum can be regarded as term that give description of range of light that are in existence, and this range from radio waves up to gamma rays. It can be explained as
range of frequencies that electromagnetic radiation takes with thier respective wavelengths as well as photon energies
The Types of electromagnetic radiation that make up the electromagnetic spectrum are
✓ microwaves
✓ infrared light
✓ ultraviolet light
✓X-rays,
✓gamma rays.
Water cam form large dewdrops in nature. How would droplets made of isopropyl alcohol instead of water be different?
Answer:
Isopropyl alcohol would form smaller droplets because it has a lower surface tension than water has.
Explanation:
'J
A student on a skateboard, with a combined mass of 78,2 kg, is moving east at
1,60 m.s 1. As he goes by, the student skilfully scoops his 6,4 kg backpack from the
bench where he had left it. What will be the velocity of the student immediately
after the pickup?
Answer:
v = 1.48 m / s
Explanation:
This is an exercise in conserving the moment. Let's define a reference system made up of the student, the scooter and the collected mass. For this system the forces during the collection are internal and element and conserves
initial interim. Before picking up the merchandise
p₀ = M v₀
final instant. After picking up the object
p_f = (M + m ') v
how the moment was created
p₀ = p_f
M v₀ = (M + m) v
let's calculate
v = [tex]\frac{M}{m+ M}[/tex] vo
v = 78.2 / (6.4 +78.2) 1.60
v = 1.48 m / s
If an irregularly shaped object (such as a wrench) is dropped from rest in a classroom and feels no air resistance, it will If an irregularly shaped object (such as a wrench) is dropped from rest in a classroom and feels no air resistance, it will accelerate and turn about its center of gravity with uniform angular speed. accelerate and turn about its center of gravity with uniform angular acceleration. accelerate and turn until its center of gravity reaches its lowest point. accelerate and spin until its center of gravity reaches its highest point. accelerate but will not spin.
Answer:
It accelerate but will not spin.
Explanation:
If an irregular shaped object is dropped from rest without feeling any form of air resistance it will accelerate without spinning and this is due to the fact that there is no Torque around the center of gravity
11.
How can we increase pressure?
Reducing surface area
Increasing surface area
Reducing force
If the surface area becomes smaller, the pressure becomes larger.
The electron gun in a television tube uses a uniform electric field to accelerate electrons from rest to 4.1 x 10^7 m/s in a distance of 1.4 cm
Answer:
a = 6 x 10¹⁶ m/s²
Explanation:
The acceleration of the electrons can be found by using the third equation of motion:
[tex]2as = v_f^2-v_i^2[/tex]
where,
a = acceleration = ?
s = distance = 1.4 cm = 0.014 m
vf = final speed = 4.1 x 10⁷ m/s
vi = initial speed = 0 m/s
Therefore,
[tex]2a(0.014\ m) = (4.1\ x\ 10^7\ m/s)^2-(0\ m/s)^2\\\\a = \frac{1.681\ x\ 10^{15}\ m^2/s^2}{0.028\ m}[/tex]
a = 6 x 10¹⁶ m/s²
The acceleration of the electron will be a = 6 x 10¹⁶ m/s²
What is acceleration?The acceleration is defined as when the velocity of any moving object changes with respect to the time it is called as the acceleration.
The acceleration of the electrons can be found by using the third equation of motion:
[tex]2as=v_f^2-v_i^2[/tex]
where,
a = acceleration = ?
s = distance = 1.4 cm = 0.014 m
vf = final speed = 4.1 x 10⁷ m/s
vi = initial speed = 0 m/s
Therefore, By putting the values we will get
[tex]2a(0.014)=(4.1\times 10^7)-(0)[/tex]
[tex]a=\dfrac{1.681\times 10^{15}}{0.028}[/tex]
a = 6 x 10¹⁶ m/s²
Thus the acceleration of the electron will be a = 6 x 10¹⁶ m/s²
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write formula of Plank's constant ,angular momentum, impulse ,stress,Young s modulus.
Answer:
E = hf. Plank's constant
L=mvr Angular momentum
F • t = m • Δ v. Implulse
: σ = F/A Stress
Explanation:
for youngs modulus its in the pictuure
Which of the following is the most important difference between a permanent magnet and a electromagnet
Answer:
Explanation: the major difference between an electromagnet and permanent magnet is that the former can have a magnetic field when electric current flows through it and disappears when the flow of the current stops. ... It will always displays the magnetic behaviour.
