Answer: It helps scientists access info more easily about the elements, in a more efficient and faster way. The periodic table is helpful in seeing atomic and chemical trends by seeing where they are placed on the table.
Explanation:
The tension on each segment of the clothesline is : 110 N
<u>Given data : </u>
mass of object = 100 n = 10 kg
Horizontal distance of clothesline = 4 m
middle of clothesline sag s by : 1m
<h3 /><h3>Determine the tension on each segment of clothesline</h3>
<u>First step</u> : calculate the horizontal angle made by the sagging
β = arctan ( 1 m / 2m ) ----- ( 1 )
= arctan ( 0.5 )
≈ 26.57°
Note : Tension in th y axis ( Ty ) = Tsinβ
Therefore :
Tension on each segment can be calculated using the formula below
2Tsinβ - mg = 0
solve for T
T = mg / 2sinβ
= ( 10 * 9.8 ) / 2 * sin 26.57°
= 98 / 0.89
= 110 N
Hence we can conclude that the tension on each segment of the clothesline is : 110 N
Learn more about Tension calculations : brainly.com/question/24994188
Answer:
Answer:
I. The hollow sphere has the greater angular momentum.
Explanation:
Given that the mass and radius of hollow sphere and solid sphere are same. Let the mass and radius of two spheres be m and r respectively. The two spheres are rotating having same angular velocity ω .
Moment of inertia of solid sphere, I₁ =
Moment of inertia of hollow sphere, I₂ =
Since, I₁ and I₂ are not equal. Therefore, the statement iv is wrong.
The relation between angular momentum, moment of inertia and angular velocity is :
L = Iω
Let L₁ and L₂ be the angular momentum of solid sphere and hollow sphere respectively.
L₁ = I₁ω and L₂ = I₂ω
As ω is same for both spheres but I₂ is greater than I₁, hence L₂ is greater than L₁.
Therefore, statement I is correct that the hollow sphere has the greater angular momentum.
Explanation:
Here the answer choices that accompany this question:
- Heat energy from the fire was radiated through the air to the candle
- Heat energy from the fire was conducted through the table to the candle
- Heat energy from the fire reached the candle by convection
- Heat energy from the fire was conducted through the air into the candle.
Answer:
- Heat energy from the fire was radiated through the air to the candle
Explanation:
Heat energy is transferred from hot sources to colder substances by any of three mechanisms: <em>conduction, convection, or radiation.</em>
<em>Conduction</em> only happens by direct contact of the objects because it relies of the transfer of kinetic energy by the vibration of the particles (atoms or molecules). Then this mechanism is not responsible of the melting of the candle which is to some distance of the fire. Hence, the second and the fourth choices are not correct.
<em>Convection</em> happens by the movement of fluids (liquids or gases): the liquids or gases when move carry on heat. The particles travel and carry on heat energy with them transfering heat from the hotter substance to the colder one. Fire does not move from the fireplace to the table where the candle is, hence the third option is also incorrect.
<em>Radiation</em> is the transfer of heat energy by electromagnetic waves. Electromagnetic waves do not require a physical medium to travel. Radiaton is a typical form of heat transfer from very hot objcets. Since fire is at a very high temperature, radiation heat transfer occurs to an important degree and is responsible for melting the candle. Hence, the first choice is correct.
Answer:
The answer is in the question?