A . 2 m/s^2
B . 30 m/s^2
C . 30 m/s
D . 0.5 m/s
Answers
Answer:
C-30m/s that my answer
Related Questions
"One step in the manufacture of silicon wafers used in the microelectronics industry is the melt crystallization of silicon into a crystalline silicon ingot. This processis carried out within a special furnace. When the newly solidified ingot is removed from the furnace, it is assumed to have a uniform initial temperature of 1600 K, which is below the crystallization temperature. At this temperature, the thermal conductivity of silicon is 22 W/(m•K), the density is 2300 kg/m3, and the heat capacity is 1000 J/(kg•K). The hot solid silicon ingot is allowed to cool in air maintained at a constant ambient temperature of 30°C. The diameter of the silicon rod is 15 cm. End effects are considered negligible. The convective heat transfer coefficient is 147 W/(m2•K). What temperature will exist 1.5 cm from the surface of the ingot after a cooling time of 583 sec (9.72 min)?" Consider the rod as acylinder placed vertically.
If you were to throw flour on the man in the photo, the flour would stick to the man's chest everywhere but on his scar. Why?
A diver shines light up to the surface of a smooth pond at a 10 degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of __________. A) less than 10 degrees. B) 10 degrees. C) more than 10 degrees.
the mass of an object is a) equal to its weight on the surface of the earth. b) sometimes equal to its weight. c) never equal to its weight. d) equal to its weight in deep space.
b. salinity
c. fecundity
d. temperature E. wave height F. current speed
Answers
Answer: b and d
Explanation:
I don’t really have an explanation I just took the test and this was the answer good luck
B. Ultraviolet rays
(C. X rays)
D. Infrared waves
A virtual image produced by a lens is always
A. located in front of the lens.
(B. located in the back of the lens.)
C. smaller than the object.
D. larger than the object.
Reflecting telescopes are popular because they're
A. more durable than a refracting telescope.
B. more powerful than a refracting telescope.
C. easier to build than a refracting telescope.
(D. smaller than a refracting telescope.)
The unit for measuring the rate at which light energy is radiated from a source is the
A. lux.
B. lumen.
(C. candela.)
D. Angstrom
A magnifying glass is an example of a _______ lens.
A. plano-concave
(B. plano-convex)
C. double-concave
D. converging
my answer is in ( ) and the answers are wrong please tell me the correct answer because i dont have a clue
Answers
1. Answer;
B. ultraviolet rays
Ultraviolet rays are the type of electromagnetic radiation that causes certain substances to fluoresce.
Explanation;
- UV light is an electromagnetic radiation present in sunlight, that is shorter in wavelength than visible light and longer than X-rays.
- Ultraviolet radiation is undetectable by the human eye, however, when it falls on certain substances, it may cause them to fluoresce that is emit electromagnetic radiation of lower energy, such as visible light.
- Fluorescence is a phenomenon that causes a mineral to glow within the visible spectrum when exposed to ultraviolet light.
2. Answer;
B. located in the back of the lens.
Explanation;
- Virtual images are those images that are locations from where lights appears to have converged. Additionally, virtual images can not be reproduced on a a screen, and occur on the opposite side of the object and are always upright.
- Virtual images are formed by the diverging or concave lenses or by placing the object inside the focal length of a converging lens. The image is located at the back of the lens.
3. Answer;
C. easier to build than a refracting telescope.
Explanation;
- Reflecting telescopes are those telescopes that uses mirrors to focus the light while refracting telescopes uses lenses to focus the light.
- Reflecting telescopes have many advantages over refracting telescopes. These includes, the fact that mirrors don't cause chromatic aberration and they are easier and cheaper to build large.
- Additionally, they are easier to mount because the back of the mirror can be used to attach to the mount.
4. Answer
C. Lumen
The unit for measuring the rate at which light energy is radiated from a source is the Lumen.
Explanation;
- Luminous flux is the time rate of the flow of light, or the visible energy produced from a certain light source. It is the quantitative measure of brilliance of a light source. The unit of luminous flux is lumen (lm.
- Luminous intensity on the other hand is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. Luminous intensity is measured in Candela.
- We could say that one lumen is the luminous flux of the uniform point light source that has a luminous intensity of 1 candela.
5. Answer;
B. Plano-convex lens
A magnifying glass is an example of a plano-convex lens.
Explanation;
- Convex lenses are types of lenses that are thicker at the center and thinner at the edges. Plano-convex lens is a type of convex lens.
- Plano-convex lenses are types of lenses that are positive focal length elements with one spherical surface and one flat surface.
- These types of lenses are designed for parallel light use or simple imaging. therefore they are ideal for all purpose focusing elements.
- Magnifying glass is a type of convex lenses and an example of plano-convex lens, that is used to produce magnified image of an object.
2) It's D. The lens enlarges the image.
3) It's actually more powerful so it's B. People usually buy products based on quality than portability.
4) CORRECT
5) CORRECT
a. True
b. False
Answers
at every point all around the circuit.
It's the voltage that drops across each resistance.
b. 0 k.
c. 0 ºc.
d. 273 k. answers
Answers
0K, also called absolute zero, is the lowest possible temperature theoretically possible (not yet reached!). It is believed that at this temperature, motion of all particles slows, and possibly stops. Also, remember that as the temperature decreases, the motion of particles also decreases.
Answers
Answer: The length of each part of the wire 20 centimeter.
Explanation:
Length of the wire = 1 m
On dissecting the 1 meter wire into equal five parts =
The length of the each part will be =
1 meter = 100 centimeter
So, 0.2 meter =
The length of each part of the wire 20 centimeter.
Answers
The frequency at which the stationary listener will hear the sound of the plane as it approaches is 5.54 KHz
Data obtained from the question
- velocity of source (vₛ) = 114 m/s
- original frequency (f₀) = 3.65 KHz
- velocity of observer (v₀) = 0 m/s
- velocity of sound (v) = 334 m/s
- Observer's frequency (f₀) =?
How to determine the the observer's frequency
Applying the equation of Doppler effect, the observer's frequency can be obtained as follow:
f₀ = [(v + v₀) / (v – vₛ)]f
f₀ = [(334 + 0) / (334 – 114)] × 3.65
f₀ = [334 / 220] × 3.65
f₀ = 5.54 KHz
Learn more about Doppler effect:
Answer:
Explanation:
velocity of source, Vs = 114 m/s
original frequency, f = 3.65 kHz
velocity of observer , Vo = 0 m/s
velocity of sound, v = 334 m/s
let the frequency is f'.
The formula for the doppler effect is given by
where, v is the velocity of sound.
f' = 5.54 kHz