Answer:
θ = 36.9°
N = 240 N
R = 120 N
Explanation:
Draw a free body diagram. There are five forces on the ladder:
Weight force mg pulling down at the center of the ladder,
Normal force N pushing up at the ground,
Friction force Nμ pushing right at the ground,
Reaction force R pushing left at the wall,
and friction force Rμ pushing up at the wall.
Sum of forces in the x direction:
∑F = ma
Nμ − R = 0
R = Nμ
Sum of forces in the y direction:
∑F = ma
N + Rμ − mg = 0
N + Nμ² − mg = 0
N (1 + μ²) = mg
1 + μ² = mg / N
Sum of torques about the base of the ladder.
∑τ = Iα
mg (L/2 cos θ) − R (L sin θ) − Rμ (L cos θ) = 0
mg (L/2 cos θ) = R (L sin θ) + Rμ (L cos θ)
mg (1/2 cos θ) = R (sin θ + μ cos θ)
mg / 2 = R (tan θ + μ)
mg / (2R) = tan θ + μ
Substitute:
mg / (2Nμ) = tan θ + μ
(1 + μ²) / (2μ) = tan θ + μ
(1 − μ²) / (2μ) = tan θ
Given μ = 0.5:
tan θ = (1 − 0.5²) / (2 × 0.5)
tan θ = 0.75
θ = 36.9°
The reaction forces are:
N = mg / (1 + μ²) = 240 N
R = Nμ = 120 N
What did Thomson’s and Rutherford’s experiments have in common? They both used charged particles in their experiments. They both used emission spectra to discover electron clouds. They both compared the atom to an indivisible sphere. They both discovered electron clouds.
Answer:
Both Thomson and Rutherford used charged particles in their experiments.
Explanation:
3. There are twice as many people in the household, but your income has also doubled. Is your new
tax liability about twice as much as when you were single, more than twice as much, or less than
twice as much? Tell whether you think this difference-or the lack of one-seems fair.
Answer:
The answer is less than twice as much.
Explanation:
When the income doubles, the personal tax liability also doubles. However, because I have more dependents on my household, I'm able to get tax reductions to take care of the dependents.
In order to stop experimental subjects from trying to confirm the scientist's hypothesis, psychologists sometimes obtain written promises from participants to be honest maintain subject confidentiality deceive participants about the true purpose of the experiment allow people to choose when they want to leave the study remove participants from the study before it starts
Answer:
C deceive participants
Explanation:
It is ethical practice to come clean or tell the truth about being deceptive at the end of the study. They need to be told that they were deceived.
In order to stop experimental subjects from trying to confirm the scientist's hypothesis, psychologists sometimes deceive participants about the true purpose of the experiment. The correct option is C.
What is psychologists?Psychologists can help people learn to cope with stressful situations, overcome addictions, manage chronic illnesses, and administer tests and assessments that can aid in the diagnosis of a condition or reveal more about a person's thoughts, feelings, and behaviors.
Psychotherapy can be aided by both psychologists and psychiatrists.
However, most psychiatrists treat patients primarily through medication, whereas psychologists primarily treat patients through talk and/or behavioral therapy.
People seek the help of a clinical psychologist to deal with mood-related issues such as depression, mania, anger, or anxiety.
Psychologists sometimes deceive participants about the true purpose of the experiment in order to prevent experimental subjects from attempting to confirm the scientist's hypothesis.
Thus, the correct option is C.
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A TV set shoots out a beam of electrons. The beam current is 10A. How many electrons strike the TV screen in a minute.
Answer:
600 mC
Explanation:
The charge of an electron is 1.6 x 10-19C so for a current with 10 mA, the charge going to screen in one second is 10 mC
so number of electrons, n = (10 x 10-3)/(1.6 x 10-19) = 6.25 x 1016 so in a minute the charge is 10 * 60 = 600 mC
Answer:
Total charge, q = It = 10 A x 60 s = 600 C
We know that, q = ne
So no. of electrons, n = q/e = 600 / (1.6×10-19) = 375x1019
A student claims that any object in motion must experience a force that keeps it in motion. Do you agree or disagree? Please explain your reasoning.
Answer:
i agree
Explanation:
because it is in motion sooo it has a force of course
if it doesn't experience emotional Force it will stop being in motion
In the diagram, q1 = +6.60*10^-9 C and q2 = +3.10*10^-9 C. Find the magnitude of the total electric field at point P. pls help?
Answer:
|E(t)| = 1258,46 [N/C]
α = 67,5⁰ (angle with respect x-axis)
Explanation:
E(t) Electric Field is a vector, so we need to determine module and direction
E(t) = E(q₁) + E (q₂) Where E(q₁) and E (q₂) are electric fields due to electric charge q₁ and q₂ respectively.
E(q₁) = K * q₁/ (d₁)² K = 9 *10⁹ [N*m²/C²] d₁ = 0,350 m
E(q₁) = 9 *10⁹ * 6,6*10⁻⁹ / 0,1225 [N*m²/C²] *C/m²
E(q₁) = 484,9 [N/C]
E(q₂) = 9 *10⁹ * 3,1*10⁻⁹ / 0,024025
E(q₂) = 1161,29
Then
|E(t)| = √ |Eq₁|² + |Eq₂|²
|E(t)| = √ ( 484,9)² +( 1161,29)²
|E(t)| = √ 235128 + 1348594,46
|E(t)| = 1258,46 [N/C]
And tanα = 1161,29/484,9 tanα = 2,395 α = 67,5⁰
The angle of the vector electric field with the x-axis
Answer:
1258.46 N/C
Explanation:
acellus
used to measure mass
━━━━━━━☆☆━━━━━━━
▹ Answer
Kg is the unit used to measure mass.
▹ Step-by-Step Explanation
Kg stands for kilogram, and is the SI unit used to measure mass.
Hope this helps!
CloutAnswers ❁
━━━━━━━☆☆━━━━━━━
Which of the following could be used to convert chemical energy to heat energy?
a. a chair sitting still
c. a leaf absorbing sunlight
b. a battery powering a flashlight d. a rock hitting the ground
Answer:
C
Explanation:
Inside a battery there are chemical reactions. When the battery is powering a flashlight, this chemical energy gives a heat one.
how are longitudinal and transverse waves alike? how are they different?
Answer:
Both waves have some common features
Explanation:
Following features are similar in longitudinal and transverse waves:
Both waves are mechanical waves.
Both transport energy without transporting matter.
Particles oscillate about their mean position in both waves.
These waves satisfy the formula:
v=f*λ
Answer:
SAME:
- They both transfer energy in waves
- They both have a frequency and period
- Both are mechanical waves and require a medium
DIFFERENT:
- Transverse waves move in a perpendicular direction
- Longitudinal waves move in a parallel direction
All objects, regardless of their mass, fall with the same rate of acceleration on
the moon.
A. True
B. False
Answer:
A -TRUE
Explanation:
The mass, size, and shape of the object are not a factor in describing the motion of the object. So all objects, regardless of size or shape or weight, free fall with the same acceleration.
A certain light bulb consumes 200J of electrical energy per second, but only emits 25J of light energy per second. Calculate the efficiency of this bulb.
Answer:
The answer is 12.5%
Explanation:
The efficiency of a light bulb is:
Light energy comes out of the bulb / Electrical energy that was put in
= 25J / 200J = 12.5%
why is science always changing
Answer:
Science is changing because little by little scientists descover new things.
Explanation:
Discovery
Hope this helps:)
Johnathan wants to lift a 200N box onto a 5m ledge. How much work is done?
a. 1000 J
b. 40 J
c. 0.025 J
d. 195 J
Answer:
1000 J which agrees with answer a in your list of options
Explanation:
Recall the formula for work (W) as the force (F) applied times the distance (d) covered in the same direction of the force:
W = F * d
W = 200 N * 5 m = 1000 J
What kind of information would be published in the Occupational Outlook Handbook (OOH)?
training guides for a chosen field
religious demographics of workers in a chosen field
current job openings in a chosen field
prospects for growth in a chosen field
Answer:
Explanation:growth of field is according chatestrophic reactions in physics due to radiation of sun
An alarm clock has a resistance of 14,000 ohms and is plugged into a 120-volt outlet. How much power does the clock use?
ОА.
0.0086 watts
OB.
0.96 watts
O C.
120 watts
OD
1.0 watts
Answer:
D . 1.0 watts!!!
To measure the amount of mass in an object, which piece of equipment would be used?
a. balance
c. graduated cylinder
b. Newton spring scale
d. meter stick
A cylinder is submerged in water as illustrated in the diagram. At which two positions is the pressure the same?
1- A and B
2- B and C
3- A and D
4- B and D
Answer:
it is two or three
Explanation:
Answer:
2- B and C
Explanation:
The arrows are at the same location in opposite ends and are the same length.
The industry that provides the service of people's experience,
knowledge, or skills is known as the tertiary or
Services industry.
Answer:
Explanation:
true
The industry which provides service to the experience, knowledge or skill of the people is known as tertiary or service industry. This statement is True.
What is Service industry?Tertiary industry provides services to its consumers which is also known as service industry/sector which is also known as service industry/sector.
This sector includes a wide range of activities ranging from commerce to administration, transportation, financial and real estate activities, business and personal services, education, health and social work.
Companies within a service industry provide specific products or services that satisfy a need or are otherwise useful to customers such as manufacturing or production, service industries do not rely on the sale of goods or physical products that they otherwise provide to the public. provide essential services.
Thus, the industry which provides service to the experience, knowledge or skill of the people is known as tertiary or service industry. This statement is True.
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If the cross-sectional area of a wire is decreased while all other factors remain the same, how will the resistance change?
OA
It will increase
OB.
It will decrease.
OC. It will go to zero.
OD
The cross-sectional area does not affect the resistance.
Answer:
The answer is OA it will increase.
Explanation:
Suppose a tank filled with water has a liquid column with a height of 10 meters. If the area is 2 square meters (2 m²), what's the force of gravity acting on the column of water?
Answer:
196000 N
Explanation:
The following data were obtained from the question:
Height (h) = 10 m
Area (A) = 2 m²
Force (F) =.?
Next, we shall determine the pressure in the tank.
This can be obtained as follow:
P = dgh
Where
P is the pressure.
d is the density of the liquid.
g is acceleration due to gravity
h is the height.
Height (h) = 10 m
Density (d) of water = 1000 kg/m³
Acceleration due to gravity (g) = 9.8 m/s²
Pressure (P) =...?
P = dgh
P = 1000 × 9.8 × 10
P = 98000 N/m²
Therefore, the pressure acting on the tank is 98000 N/m²
Finally, we shall determine the force of gravity acting on the column of water as follow:
Area (A) = 2 m²
Pressure (P) = 98000 N/m²
Force (F) =.?
Pressure (P) = Force (F) /Area (A)
P = F /A
98000 = F/ 2
Cross multiply
F = 98000 × 2
F = 196000 N
Therefore, the force of gravity acting on the column of water is 196000 N
When an object is fully magnetized, all of its magnetic domains will be ?
A
Facing random directions,
B
Facing opposite directions, split down the middle of the object.
С
Facing opposite directions every-other domain
D
All facing the same direction.
What is entropy need help ASAP pz
why can the suns rays cause a burn but the light from a flashlight cannot harm your skin?
Find the x-component of this vector: 47.3 m 39.4 ° Remember, angles are measured from the + x axis. x-component (m)
The x-component of the vector is 36.55 m.
Components of vectorsThe components of a vector include both x and y components. The x-component is determined along x-axis, while y-component is determined along y-axis.
Vx = Vcosθ
Vy = Vsinθ
where;
Vx is the x-component of the vectorVy is the y-component of the vectorX-components of the vectorThe x-component of the vector is calculated as follows;
x = 47.3 x cos(39.4)
x = 36.55 m
Thus, the x-component of the vector is 36.55 m.
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fill in the term to complete each sentence
a wave carries___ from one place to another.
mechanical waves carry energy through___.
Energy
A material medium
A wave carries energy from one place to another. Mechanical waves carry energy through a material medium.
What is a wave?A wave is a phenomenon that flows across a material medium without leaving any lasting mark.
Mechanical or electromagnetic waves can be used to classify them. Transverse and longitudinal are the two main forms.
A wave carries energy from one place to another. Mechanical waves carry energy through a material medium.
Hence the correct options for the fill-in-the-blanks are energy and a material medium.
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Question 38(Multiple Choice Worth 2 points)
[OSS.01]The theories surrounding the formation of our solar system are based on many
biased opinions
incorrect facts
non-testable data
scientific investigations
Answer:Scientific Investigations
Explanation:
Which of the following is part of the internal energy of a substance?
O A. Kinetic energy from nuclear forces
B. Kinetic energy from intermolecular forces
O C. Potential energy from nuclear forces
O D. Potential energy from intermolecular forces
The correct answer is Potential energy from intermolecular forces.
Potential energy from intermolecular forces is part of the internal energy of a substance, therefore the correct option is D.
What is internal energy?It is the total energy of the substance that is contained in the system which is the sum of all the kinetic energy and potential energy of the molecules and the atoms contained in it.
The potential energy of the intermolecular forces is also part of the internal energy of the substance.
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QUESTION 3
According to Freud, moral standards are developed as a result of:
a. identification
b. id control
C. ego control
d. defense mechanisms
Answer:
it is for ego control and for super ego control
here's some more information:
Standards provide people and organizations with a basis for mutual understanding, and are used as tools to facilitate communication, measurement, commerce and manufacturing. Standards are everywhere and play an important role in the economy, by: facilitating business interaction.
What percent of the gross domestic product (GDP) is currently generated by the service industry?
68 percent
71 percent
82 percent
95 percent
The global economy is heavily reliant on the service sector, which accounts for more than two-thirds of global GDP, over three-quarters of foreign direct investment in advanced nations, the majority of worker employment, and the majority of job growth. Thus, option B is correct.
What GDP is generated by the service industry?The service sector, often known as the tertiary sector, makes up the third tier of the three-sector economy. Instead of creating products, this sector provides training, consulting, and maintenance and repairs.
The GDP of the nation is significantly impacted by the service sector. Through trade in services, it not only generates many jobs, but also significantly improves the country's economic performance.
Therefore, 70% of GDP is made up of consumer expenditure. The retail and service sectors are important to the American economy.
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HELP ASAP PLSSSSSSS!!!!! The scientific method often begins by asking questions about the natural world. Which of the following is an example of a scientific question? A)How does fertilizer affect plant growth? B)What's the best species of fish? C)Which color is best for wall paint? D)Who is the fastest person in the world?
Answer:
A)How does fertilizer affect plant growth
Explanation:
there are some effects of different fertilizer on plants
1 is providing multi-nutrition
2 soil amelioration
3 increasing production
4 slow release.
Answer:
How does fertilizer affect plant growth?
Explanation:
