state how heat loss by radiation is minimized in a thermos flask
in which kind of community do people mostly work in groups that generate idea and provide services?
Answer:
Postindustrial
Explanation:
The maximum distance particles of the medium move when a wave passes through them is wave.
Answer:
amplitude
Explanation:
25 POINTS!! will mark brainliest.
What properties of X-rays and gamma rays make them the forms of electromagnetic radiation with the most energy?
a. They have low frequencies and short wavelengths.
b. They have high frequencies and long wavelengths.
c. They have high frequencies and short wavelengths.
d.They have low frequencies and long wavelengths.
if yk the rest of radiation effects unit test u7l8 would love you forever!
Answer:
they have high frequencies and short wavelength
Explanation:
hope this helps
They have high frequencies and short wavelengths are the properties of X-rays and gamma rays make them the forms of with the most energy.
What is electromagnetic radiation?Electromagnetic radiation is a type of energy that is transmitted in incident photons as both magnetic and electric waves.
Electromagnetic radiation has a spectrum with varying wavelengths and frequencies, which gives it different properties.
Electromagnetic radiation is a type of energy that travels in packets of energy called photons as both electrical and magnetic waves.
Wave-particle duality is the name given to this phenomenon. This is a notion that defines how a wave behaves whether it behaves like particles, waves, or both particles and waves.
They have high frequencies and short wavelengths are the properties of X-rays and gamma rays make them the forms of with the most energy.
Hence, option C is correct.
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Which of the following statements is true: black holes cannot be seen because they are too far away. black holes cannot be seen, but we can see the effects of their gravitational fields. a black hole is a final stage of a low-mass star. None of the above.
The statements is true about black holes is "black holes cannot be seen, but we can see the effects of their gravitational fields." . Option B. This is further explained below.
What are black holes?Generally, A black hole is simply defined as a region of space where gravity is strong that light cannot escape.
In conclusion, We can't see black holes, but we can witness the consequences of their gravitational fields.
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Activity 2. The Cyclist's Speed!
Directions: Analyze the speed time graph of a cyclist on a straight track and answer the questions below.
1. What time in the graph is the
a. speed constant?________________
b. cyclist accelerating? __________
c. cyclist decelarating? __________
2. Is the motion of the cyclist uniform?
________________________________________________
Answer:
1.
A. 10 - 20 seconds
B. 0 - 10 seconds and 20 - 30 seconds
C. 30 - 50 seconds
2. No
Explanation:
When a rifle fires, a sequence of events takes place. After the firing pin strikes the primer, what is the next event in the sequence?.
Answer:
what the freak
Explanation:
the kinetic energy of the whatever hit the bullet is transferred to enabling it to accelerate thus attaining a velocity with which it moves out of the barrel of the gun but some of the kinetic energy is lost in form of sound and heat energy and the bullet travels out the barrel to the target
What is an object’s acceleration if it is moving at 40 m/s and comes to a stop in 5 s?
35 m/s 2
8 m/s 2
–8 m/s 2
200 m/s2
Answer:
- 8 m/s^2
Explanation:
given:
Final velocity = 0
initial velocity = 40
time = 5 seconds
we can use the equation vf = vi + at
hence,
0 = 40 + 5a
-40 = 5a
a = -8 m/s^2
Marcus is looking at the field that surrounds a charged object. Which field is he looking at?
1. Proton field
2. Electric field
3. Magnetic field
4. Gravitational field
Answer:
I believe it's the electric field.
Explanation:
Which refers to solid ice that condenses and forms on surfaces like grass or windows?
Answer: Frost
Explanation: Frost is the deposition of ice, that develops after the freezing of the water vapor. It most commonly appears on the surfaces of the ground and can be observed as fragile crystals of ice. These can be observed on the window panes, blades of the grass, or any other solid exposed surface. The window frost develops when a pane of glass is exposed to below freezing temperature from the outer surrounding and the moist air from inside.
Answer: It is frost.
Explanation: I took the test on edge 2022.
Two charges with a certain distance apart have an electrostatic force of 400 N acting
between them. If the same charges are separated to 4 times their original distance, what
will the new electrostatic force be between them?
A. 100 N
C. 50 N
E. 1600 N
B. 25 N
D. 400 N
what elements of the company's performance should be used to help make that decision
The key elements of better decision making can help you rationalize problem, set boundaries around the solution, identify the right thing to do, identify the actions, and get feedback.
A twin-sized air mattress used for camping has dimensions of 100 cm by 200 cm by 15 cm when blown up. The weight of the mattress is 2 kg. How heavy a person could the air mattress hold if it is placed in freshwater
For a twin-sized air mattress used for camping has dimensions of 100 cm by 200 cm by 15 cm when blown up, the weight is mathematically given as
M=2923.38N
What is the weight of a person could the air mattress hold if it is placed in freshwater?Generally, the equation for the maximum mass is mathematically given as
M=Vp-m
Therefore
M=100*200*15(1*10^3)-2kg
M=298kg
In conclusion, the weight
W=298kg*9.81
W=2923.38N
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A 70kg bicyclist (including the bicycle) is pedaling right with a constant speed despite
experiencing a 50N drag. Neglect any friction impeding her motion.
What is the magnitude of the net force on the bicyclist?
How much force is her pedaling generating?
Answer:There are total four forces acting on the bicyclist namely, gravitational force, normal force, pushing force and air drag.
The magnitude of net force acting on the bicyclist is 165 N.
The required magnitude of force generated for the pedaling is of 225 N.
Given data:
The mass of bicyclist is, m = 75.0 kg.
The magnitude of acceleration is, .
The magnitude of drag force is, F = 60.0 N.
(1)
There are in total 4 forces acting on the bicyclist:
The gravitational force on the bicyclist, acting vertically downward, of magnitude , where m is the mass of the bicyclist and g is the acceleration due to gravityThe normal force exerted by the floor on the bicyclist and the bike, N, vertically upward, and of same magnitude as the gravitational forceThe force of push F", acting horizontally forward, given by the push exerted by the bicyclist on the pedalsThe air drag, F, of magnitude F = 60.0 N, acting horizontally backward, in the direction opposite to the motion of the bicyclist
(2)
The magnitude of net force acting on the bicyclist is given as,
Thus, the magnitude of net force acting on the bicyclist is 165 N.
(3)
We need to find the forward force of push, F'', which is actually the force generated during pedaling.
Then the expression for the forward pushing force F" is given as,
Thus, we can conclude that the force generated for the pedaling is of 225 N.
Explanation:
The magnitude of the net force on the bicyclist was 0 N.
Her pedaling is generating a force of 50 N in opposite of the drag force .
What is force?Force is defined in physics as: the push or pull on an object with mass that causes it to change velocity. Force is an external agent that can change the state of rest or motion of a body. It has a magnitude as well as a direction.
A spring balance can be used to calculate force.
As the bicyclist (including the bicycle) is pedaling right with a constant speed, the magnitude of the net force on the bicyclist was = mass × acceleration
= 70 kg × 0 m/s²
= 0 N.
Again her pedaling is generating a force = drag force = 50 N in opposite of the drag force . So that, net force on it becomes zero.
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You stand 3. 3 m in front of a plane mirror. Your little brother is 1. 4 m in front of you, directly between you and the mirror
What are sugar and water in a homogenous mixture of sugar and water?.
Answer:
Homogeneous mixture is a mixture of two substances that is completely even throughout the solution and there are no borders inbetween substances. It looks like one new substance. The sugar-water is a homogenous mixture while the sand-water is a heterogeneous mixture.
The magnetic field lines due to a straight, current-carrying wire are __________.
Question 1(Multiple Choice Worth 2 points)
(07.02 LC)
A photon is
O a type of wave
O a form of kinetic energy
O a quantum of light
O an electrostatic force
A photon is a quantum of light is the correct answer.
What is photon?A photon is tiny packets of energy of electromagnetic radiation. This concept is presented by Albert Einstein in order to explain the photoelectric effect. Photon is also known as light quantum because it is related to light.
So we can conclude that photon is a quantum of light is the correct answer.
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Answer:
a quantum of light
Explanation:
I got it right on the test.
What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 n/m? 1.6 j 7.9 j 15 j 20 j
The potential energy of a spring is mathematically given as
P.E= 20 J
What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 n/m?Question Parameter(s):
is compressed 0.65 m by a 25 kg block
if the spring constant is 95 n/m
Generally, the equation for the potential energy is mathematically given as
PE = mgh
Therefore
P.E=0.5 kx^2
P.E= 0.5 x 95 x (0.65)^2
P.E= 20 J
In conclusion, The potential energy of a spring
P.E= 20 J
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Answer:
(D)
Explanation:
20 J
one particular descent goes from 2100m to 1600m. Assuming work done against friction is 90% of the potential energy change of the cyclist and the cycle, what increase in speed in Km/h can a rider attain by the end of the
descent?
Answer:
1/2 M V^2 = .1 M g H where 10% of PE goes into KE
V^2 = .2 g H = .2 * 9.8 * (2100 - 1600) = 980 m^2 / s^2
V = 31.1 m/s increase in speed during descent
1 km / hr = 1000 m / 3600 sec = .278 m/s
V = 31.1 m/s / (.278 m/s / km /hr)= 112 km/hr
What is the current of the ammeter?
Answer:
.6 A
Explanation:
V = IR
V/R = I
12/20 = I = .6 A
Answer:
a) 0.60 A
Explanation:
Given that,
→ Potential difference (V) = 12 V
→ Resistance (R) = 20 Ω
→ Current (I) = ?
Formula we use,
→ I = V/R
Let's solve the problem,
→ I = V/R
→ I = 12/20
→ [ I = 0.60 ]
Hence, option (a) is the answer.
Electric charge can be transferred from one conducting body to another _________. View Available Hint(s)for Part A only by contact only by closeness without touching by both contact and closeness by no means, for charge is conserved
Answer:
by both contact and closeness
Explanation:
Why does the chlorine atom have a partial negative charge in a molecule of hydrogen chloride?
Answer:The molecule is represented by the conventional Lewis structure, even though the shared electron pair is associated to a larger extent with chlorine than with hydrogen. The unequal sharing of the bonding pair results in a partial negative charge on the chlorine atom and a partial positive charge on the hydrogen atom.
Explanation:
Please help! 30 BRAIN POINTS (if it reduces it's bcs a bot posted those random links)
After encountering another ‘syntax error’ a disgruntled programmer throws a mouse perpendicular to the ground and it explodes into 3 pieces. A 100 g piece travels at 1.2 m/s, and a 30 g piece travels at 0.80m/s. The third piece flies off at a speed of 0.75 m/s. If the angle between the first two pieces is 120 degrees calculate the momentum and direction of the third piece with respect to the 100 g piece.
The momentum and direction of the third piece with respect to the 100 g piece is 0.11 kgm/s at 11 degrees.
Conservation of linear momentumThe momentum and direction of the third piece with respect to the 100 g mass is determined by applying the principle of conservation of linear momentum.
Pi = Pf
where;
Pi is initial momentumPf is final momentum0 = P₁ + P₂ + P₃
where;
P₁ is final momentum of the first pieceP₂ is final momentum of the second pieceP₃ is final momentum of the third piece-P₃ = P₁ + P₂
-P₃x = P₁cosθ + P₂Cosθ --(1)
-P₃y = P₁sinθ + P₂sinθ --(2)
-P₃x = (0.1 x 1.2 x cos0) + (0.03 x 0.8 x cos120)
-P₃x = 0.12 - 0.012
-P₃x = 0.108 kgm/s
P₃x = -0.108 kgm/s
-P₃y = (0.1 x 1.2 x sin0) + (0.03 x 0.8 x sin120)
-P₃y = 0.0208 kgm/s
P₃y = -0.0208 kgm/s
Resultant momentum of third piece[tex]P_3 = \sqrt{P_3x^2 + P_3y^2} \\\\P_3 = \sqrt{(-0.108)^2 + (-0.0208)^2} \\\\P_3 = 0.11 \ kgm/s[/tex]
Direction of third piece[tex]tan \ \theta = \frac{P_3y}{P_3x} \\\\\theta = tan^{-1} (\frac{P_3y}{P_3x} )\\\\\theta = tan^{-1} (\frac{-0.0208}{-0.108} )\\\\\theta = 11\ ^0[/tex]
with respect to 100 g, direction of third piece is 11⁰
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Fitness Log
What can parents do to ensure the safety of their child in a sport.
Answer:
They are rich in nutrients like vitamin C, K, and manganese. They are also a good source of antioxidants, which help in preventing reducing cholesterol.
Explanation:
Continuing from the other question
Answer:
iv)Salt
III) Ethanol
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What property of matter is most responsible for the fact that sound travels at different speeds through different materials?.
Answer:
density
Explanation:
higher density ===> higher propagation speed
Collisions between galaxies are rare and have little or no effect on the stars and interstellar gas in the galaxies involved. true or false
Answer:
false
Explanation:
A body of mass 20KG is set in motion by two forces.3N and 4N acting at right angle to each other. Determine the magnitude of it's acceleration
Answer:
see below
Explanation:
Reultant force via Pythag Theorem
R = sqrt (3^2 + 4^2) = 5 N
F = ma
5 = 20 a
a = 5/20 m/s^2
The interior of a refrigerator has a surface area of 4.3 m2 . It is insulated by a 3.6 cm thick material that has a thermal conductivity of 0.0303 J/m · s ·◦ C. The ratio of the heat extracted from the interior to the work done by the motor is 6.3% of the theoretical maximum. The temperature of the room is 44.2◦C, and the temperature inside the refrigerator is 9.2 ◦C. Determine the power required to run the compressor.
Answer in units of W
Power is the ratio of the heat entered into the refrigerator to the coefficient of performance of the refrigerator. The power required to run the compressor in Watts is 249.149 W.
What is Power?
Power is the ratio of the heat entered into the refrigerator to the coefficient of performance of the refrigerator.
Given the surface area of the interior of the refrigerator is
A= 4.3 m ²
The refrigerator is insulated by a material of thickness
t =3.6 cm =0.036 m
The thermal conductivity of insulating material is
k =0.0300 J/m-s
The change in temperature inside the refrigerator and room temperature is
dT= (273.15 + 44.2) -(273.15 + 9.2) =35 K
The rate of heat entered the refrigerator.
[tex]Q=\frac{k\times A\times dT}{t}[/tex]
Substituting value into the equation, we get
Q =126.67 W
The coefficient of performance of the refrigerator is
[tex]COP=\dfrac{(273.15+9.2)}{(273.15+44.2)-(273.15+9.2)}[/tex]
COP = 8.07
As, work done by the motor is 6.3% of the theoretical maximum,
[tex]\dfrac{6.3\times8.07}{100} =0.50841[/tex]
The power required to run the compressor will be
[tex]P=\dfrac{126.67}{0.50841} =249.149\:\rm W[/tex]
The power required to run the compressor is 249.149 W
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