A disk at rest experiences constant angular acceleration for t = 25 s, at the end of which it is spinning with a frequency of f = 55 rpm. Please answer the following questions.
A)Write a general expression for the magnitude of the angular velocity of the disk after the acceleration in terms of frequency.
B)Calculate the magnitude of the angular velocity of the disk in rad/s at time t = 25 s.
C)Write a general expression for the average angular acceleration of the disk αave in terms of angular velocity.
D) Calculate the magnitude of the average angular acceleration of the disk αave from rest to t = 25 s in rad/s2.
E)Write a general expression for the period T of the disk in terms of frequency f.
F)Calculate the magnitude of the period of the disk T at time t = 25 s in seconds.
(a) A general expression for the magnitude of the angular velocity of the disk is 2πf.
(b) The magnitude of the angular velocity of the disk is 5.76 rad/s.
(c) A general expression for the average angular acceleration of the disk is ω/t.
(d) The magnitude of the average angular acceleration of the disk is 0.23 rad/s².
(e) A general expression for the period T of the disk is 1/f.
(f) The magnitude of the period of the disk is 0.17 s.
Angular velocity
The angular velocity of the disk is the rate of change of angular displacement with time.
ω = 2πf
where;
f is the frequency
[tex]\omega = 2\pi \times 55\frac{rev}{\min} \times \frac{1 \min}{60 \ s} = 5.76 \ rad/s[/tex]
The angular velocity of the disk at time, t = 25 s is 5.76 rad/s.
Average angular acceleration of the disk[tex]\alpha = \frac{\Delta \omega }{t} \\\\\alpha = \frac{5.76}{25} \\\\\alpha = 0.23 \ rad/s^2[/tex]
Period of the diskT = 1/f
T = 1/5.76
T = 0.17 s
Thus, the period of the disk at time t = 25 s is 0.17 s.
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What problem did the crew of Biosphere 2 face?
A virus from one of the animals
A loss of oxygen
One of the crew members developed cancer
The crew ran out of food.
How does the nature of heat explain the occurrence of high temperature in a human body that has a fever?
Answer:
People get a fever when their brain sets the body temperature higher than normal. This may happen as a reaction to germs such as viruses or bacteria, but it can also happen as a reaction to substances that are made by the body, such as prostaglandins. Our body produces prostaglandins to fight off germs
Explanation:
Three equal in magnitude charges are located at the corners of an equilateral
triangle of side r. The charges A and C are positive and charge B is negative.
What is the direction of the net force on charge C due to charges A and B?
(A) up to the right
(B) up
(C) right
(D) down
The direction of the net force is up.
Net force on the chargesThe net force on the charges can be determined using Coulomb's law as follows;
[tex]F_{AC} = + \frac{KQ^2}{r^2}[/tex]
[tex]F_{BC} = - \frac{KQ^2}{r^2}[/tex]
F(net) = F(AC) + F(BC)
F(net) = 0
The, direction of the net force on charge C will be parallel to charge C to achieve a zero net force. Thus, the direction of the net force is up.
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What would a wave with a low amplitude sound like?
A It would sound quiet.
B It would sound loud.
C It would sound squeaky.
D It would sound deep.
Answer: Your answer is A. it would sound quiet.
Hope this helps!
Answer:
I think a but not sure
Explanation:
The amplitude of a sound wave determines its loudness or volume. A larger amplitude means a louder sound, and a smaller amplitude means a softer sound.
What is the difference between memos and emails?
O a. Memos are usually sent online and emails are usually sent on hard copy to inform an action
b. Memos are used for internal messages and emails can be used for external communication
O c. Emails are used for longer reports and memos are used for short reminders and replies
O d. Emails are used for formal reports and proposals and memos are for informal ideas
What is the maximum possible age of the universe if H0=80km/s/Mpc
Which statement best describes the electric field?
A. The units are newton-coulombs, and the arrows indicate the direction that a negative charge placed in the field would feel a force
B. The units are newtons per coulomb, and the arrows indicate the direction that a negative charge placed in the field would feel a force.
C. The units are newton-coulombs, and the arrows indicate the direction that a positive charge placed in the field would feel a force.
D. The units are newtons per coulomb, and the arrows indicate the direction that a positive charge placed in the field would feel a force.
Answer:
D
Explanation:
How we can see different colors by our eyes?
I DID A Science PROJECT ON THIS >:)))
basically light travels into the eye to the retina located on the back of the eye. the retina is covered withe millions of light sensitive cells called Rods and cones. when these cells detect light they send signals to the brain that help detect color.
the color of an object is determined by the wavelengths of light that it reflects. it's determined by the arrangement of electrons in the atoms of that substance that will absorb and re-emit photons of particular energies according to quantum laws.
Suppose that you want to build a transformer that will convert 70 V power coming in the primary coil to 245 V power going out of the secondary coil. What is the smallest total number of turns (primary turns plus secondary turns) you need to create the transformer
Answer: 9 Turns
Explanation: primary turns + secondary turns.
The smallest total number of turns (primary turns plus secondary turns) you will need to build the transformer is 9 turns
Data obtained from the question Primary voltage (Vₚ) = 70 VSecondary voltage (Vₛ) = 245 VTotal turns =? How to determine the primary and secondary turns Primary voltage (Vₚ) = 70 VSecondary voltage (Vₛ) = 245 VPrimary turns (Nₚ) =? Secondary turns (Nₛ) =?Nₛ / Nₚ = Vₛ / Vₚ
Nₛ / Nₚ = 245 / 70
Nₛ / Nₚ = 7 / 2
Thus,
Primary turns (Nₚ) = 2 turns Secondary turns (Nₛ) = 7 turnsHow to determine the total turns Primary turns (Nₚ) = 2 turns Secondary turns (Nₛ) = 7 turnsTotal turns =?Total turns = Nₚ + Nₛ
Total turns = 2 + 7
Total turns = 9 turns
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with the aim of a diagram describe how a rain bow is formed
Answer:
Water droplets acts as tiny prism in the sky. The sunlight when enters these tiny droplets undergo internal reflection and also refract these rays which are dispersed causing a band of seven colors called rainbow.
Explanation:
Answer:
it us formed after the rain
2. Which of the following is NOT true of work?
(A) It is the scalar product of force and displacement.
(B) It is measured in joules.
(C) It has the same units as energy.
(D) It is a vector which is always in the same direction as the displacement.
(E) It takes energy to perform work
Answer:
D
Explanation:
Work is not a vector but it is a scalar
Answer:
D
Explanation:
D. its is a vector which is always in the same direction as the displacement
The efficiency of the solar panel is 70%. Calculate the power of the solar radiation incident on the panel.
The incident power of the solar radiation is 1,185.6 W.
Thermal energy gained by the waterThe thermal energy gained by the water is calculated as follows;
Q = mcΔθ
Q = 0.019 x 4200 x (72 - 20)
Q = 4,149.6 J
Power of the solar radiation incident on the panelThe incident power of the solar radiation is calculated as follows;
[tex]0.7\times P = \frac{Q}{t} \\\\P = \frac{Q}{0.7t} \\\\P = \frac{4149.6}{0.7 \times 5} \\\\P = 1,185.6 \ W[/tex]
Thus, the incident power of the solar radiation is 1,185.6 W.
The complete question is below
In 5.0 s, 0.019 kg of water flows through the tubes of a solar heater. The temperature of the water increases from 20 °C to 72 °C. The specific heat capacity of water is 4200 J / (kg °C). Calculate the thermal energy gained by the water in 5.0 s.
The efficiency of the solar panel is 70%. Calculate the power of the solar radiation incident on the panel.
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How should you solve this question. Thank you!
Explanation:
a)
R total= R1 + R2 + R3 = 50 + 25 + 10 = 85
I = V/R total = 27/85 A
V1 = IR1 = 27/85 × 50 = 270/17 v
V2 = IR2 = 27/85 × 25 = 135/17 v
V3 = IR3 = 27/85 × 10 = 54/17 v
b)
R1,2 = R1.R2/(R1+R2) = 50 × 25/75 = 50/3
R total = R1,2.R3/(R1,2 + R3) = 50/3 × 10/( 50/3 + 10) = 500/80 = 25/4
I = V/R = 27/(25/4) = 108/25 A
V1 = V2 = V3 = V = 27 v
I1 = V/R1 = 27/50 A
I2 = V/R2 = 27/25 A
I3 = V/R3 = 27/10 A
what is the velocity of a 0.145kg baseball if its kinetic energy is 109 j
Answer:
The velocity of the 0.145 kg baseball is 38.7743 m/s.
General Formulas and Concepts:
Energy
Kinetic Energy Formula: [tex]\displaystyle KE = \frac{1}{2}mv^2[/tex]
m is mass (in kg)v is velocity (in m/s)KE is kinetic energy (in J)Explanation:
Step 1: Define
Identify.
m = 0.145 kg
KE = 109 J
Step 2: Solve for v
Substitute in variables [Kinetic Energy Formula]: [tex]\displaystyle 109 \ \text{J} = \frac{1}{2}(0.145 \ \text{kg})v^2[/tex]Simplify: [tex]\displaystyle 109 \ \text{J} = (0.0725 \ \text{kg})v^2[/tex]Isolate variable term: [tex]\displaystyle 1503.45 \ \text{J/kg} = v^2[/tex]Isolate v: [tex]\displaystyle v = 38.7743 \ \text{m/s}[/tex]Topic: AP Physics 1/C
Unit: Energy
A ball of mass M and speed of V collides head on with a ball of mass 2M and a speed of v/2, as
shown above. If the two balls stick together, their speed after the collision is
Answer:
2/3V
Explanation:
Given that a ball of mass M and speed V collides with another ball of mass 2M and velocity v/2 . After collision they stick together and we need to find their speed after collision . According to Law of Conservation of Momentum , The total momentum of the system before and after collision is constant .That is ;
[tex]\sf\qquad\longrightarrow m_1u_1+m_2u_2=m_1v_1+m_2v_2\\ [/tex]
[tex]\sf\qquad\longrightarrow MV + 2M\bigg(\dfrac{V}{2}\bigg) = (2M + M)(v)\\ [/tex]
[tex]\sf\qquad\longrightarrow MV +MV= 3Mv\\[/tex]
[tex]\sf\qquad\longrightarrow 2MV = 3Mv\\ [/tex]
[tex]\sf\qquad\longrightarrow v =\dfrac{2M}{3M}V\\ [/tex]
[tex]\sf\qquad\longrightarrow \pink{ v_{after\ collision}=\dfrac{2}{3}V }[/tex]
Hence the velocity after the collision ia 2/3V .
What force (or forces) act on a stone shot up in air?
Answer:
gravitational force and the air friction
Explanation:
when there is air drag, the forces acting on the projectile are the gravitational force and air friction.
The philosopher Robert Nozick imagined an “experience machine” to show that a core feature of utilitarianism (as conceived by Bentham and Mill) does not conform with most people’s intuitions about “the good life.” Which of these core features of utilitarianism was Nozick’s main target?
Robert Nozick opines that individuals own themselves and hence have a right to own property.
What is utilitarianism?The term utilitarianism refers to the philosophical ideology that in the use of commodities, the best options is that which maximizes utility or satisfaction derived from the commodity.
In the position of Robert Nozick, utilitarianism means that individuals own themselves and hence have a right to own property.
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How would the products of electrolysis be different is a solution of zinc chloride was used instead of molten zinc chloride?
Answer:
The electrolysis of zinc chloride shows how an ionic salt will conduct electricity when molten, but not when solid.
Explanation:
hope this helps!!!! GOOD LUCK!!!!
You're collecting data in BeyondLabz for an object in free fall, subject to air resistance. How do you know when you've collected enough data points for a single run
Enough data points would have been collected when specific data for upward and downward motion are collected.
What is a Data point?A data point is a discrete unit of information. This information is always unique.
Free fallAn object subjected to free fall is under the influence of gravity. An object subjected has different time of motion for upward and downward motion.
Thus, we can conclude that enough data points would have been collected when specific data for upward and downward motion are collected.
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The diagram shows a negative charge moving in a magnetic field.
Parallel vectors evenly spaced labeled B. There is a circle labeled v.
In which direction is the magnetic force acting on the charge?
right
left
into the screen
out of the screen
Answer:
Left
Explanation:
right on edge
Answer:
left
Explanation:
Pleeasse solve it ill give brainliest please
Answer:
a) 210 Ω
b) 21 V
c) 0.07 A, 0.03 V
d) VAE = 7 V
VEB = 14 V
VAF = 9 V
VFB = 12 V
Explanation:
a) 100 Ω and 200 Ω are in series, equivalent = 100 + 200 = 300 Ω,
300 Ω and 400 Ω are in series, equivalent = 300 + 400 = 700 Ω
300 Ω and 700Ω are in parallel, so the equivalent resistance between A and B is R where
1/300 + 1/700 = 1/R, get R = 210 Ω
b) Given I = 0.1 A
so VAB = I * R = 1 * 210 = 21.0 V
c) I₁ + I₂ = I = 0.1, so I₂ = 0.1 - I₁
I₁ * 300 = I₂ * 700
I₁ * 300 = (0.1 - I₁) * 700
get I₁ = 0.07 A, I₂ = 0.1 - I₁ = 0.03 A
d) VAE = I₁ * 100 = 7 V
VEB = I₁ * 200 = 14 V
VAF = I₂ * 300 = 9 V
VFB = I₂ * 400 = 12 V
When the potential difference between the plates of a capacitor is increased by 3.50 V , the magnitude of the charge on each plate increases by 15.0 μC . What is the capacitance of this capacitor in μF?
Answer:
42.9 μF
Explanation:
V = 3.50 V, Q = 150 μC
C = Q/V = 150/3.50 μF = 42.9 μF
HELP!!!!!!!!!!!!!!!!!!! Which best describes an example of a p-type semiconductor?
It uses arsenic so that electrical conduction is due to the movement of electrons.
It uses arsenic so that electrical conduction is due to the movement of a positive charge.
It uses boron so that electrical conduction is due to the movement of electrons.
It uses boron so that electrical conduction is due to the movement of a positive charge.
UPDATE: THE ANSWER IS D
Answer:
D
Explanation:
The best description of a p-type semiconductor is It uses boron so that electrical conduction is due to the movement of a positive charge.THe correct option is D.
What is a p-type semiconductor?A p-type semiconductor is created by doping a pure semiconductor material, such as silicon, with an impurity that has one less electron than the semiconductor. Boron, which has three valence electrons, is commonly used as a dopant to create p-type semiconductors.
When boron atoms are introduced into a pure semiconductor material such as silicon, they create "holes" in the crystal lattice structure. These holes can be thought of as vacancies where an electron would normally be. The holes are positively charged and can move around the crystal lattice structure. When an electric field is applied to the p-type semiconductor, the holes move towards the negative electrode, and this movement of holes is what causes electrical conduction in a p-type semiconductor.
Therefore, the statement that best describes an example of a p-type semiconductor is "It uses boron so that electrical conduction is due to the movement of a positive charge."
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velocity ratio of a machine is 4 what does it mean
Answer:
It means that the velocity of the machine is 4
The average distance from earth to the sun is 150,000,000 km what is the name of the unit scientists created that is equal to the distance from earth to the sun
Answer: The name of the unit is A.U's(Astronomical unit)
Explanation:
2. Do the results by using a larger sample demonstrate the advantage of having a larger sample in the scattering experiment? Explain.
Answer: Better to have a larger sample size to precisely calculate.
Explanation: Larger sample sizes enable the researchers to more precisely calculate the expected principles of their own data and avoid errors caused by testing a small number of potentially atypical samples.
Your washer has power of 450 watts, and your dryer has a power of 3000
watts. How much energy do you use to clean a load of clothes in 1 hour of
washing and 1.5 hours of drying?
Answer:
4950 watt hours.
Explanation:
450*1 + 3000*1.5 = 4950w
32. A ball is going to fall downward through a vacuum chamber. If it has maximum potential energy at the top and maximum kinetic energy at the
bottom where along the fall will half of its maximum velocity occur?
A: At exactly halfway down
B: At more than halfway down (between halfway and the bottom)
C: At less than halfway down (between halfway and the top)
Half maximum velocity occurs at the point of half maximum kinetic energy which is exactly halfway down.
Conservation of energyThe principle of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
M.A = K.E + P.E
At the maximum height, the kinetic energy of the ball while potential energy is maximum.
At the half-way down, the ball kinetic energy of the ball is equal to the potential energy.
Thus, half maximum velocity occurs at the point of half maximum kinetic energy which is exactly halfway down.
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HELLLPPPPPP PLEASEEEE ANSWWERRR THE QUESTION USING PHET's COULOMB'S LAW SIMULATION:
Question:
How does changing the charge’s value influence the force between the two charges?
is it a multi or is it writing
