Answer: b. infrared
Explanation:
The visible light with the smaller frequency is associated with the color red.
While the blue is the one with the larger frequency.
Now, as the name says, infrared waves are the ones with a frequency just below the one of the red visible light.
Where the frequency of the red light is something around (4.3*10^14 Hz)
and the frequency of the infrared waves is in the range between (10^12 Hz and 10^14 Hz)
Then the correct option is b, infrared.
A 64 kg swimmer jumps, with a velocity of 4.2 m/s, off the front of a 25 kg kayak when the kayak is moving forward at a velocity of 3.2 m/s. What is the velocity of the kayak after the swimmer jumps off
Answer:
3.88m/s
Explanation:
Using the law of conservation of momentum
m1u1+m2u2 = (m1+m2)v
m1 and m2 are the masses
u1 and 2 are the initial velocities
v is the final velocity
Given
m1 = 64kg
u1 = 4.2m/s
m2 = 25kg
u2 = 3.2m/s
Required
Final velocity v
Substitute the given values into the formula
64(4.2)+25(3.2) = (65+25)v
268.8+80 = 90v
348.8 = 90v
v = 348.8/90
v = 3.88m/s
Hence the velocity of the kayak after the swimmer jumps off is 3.88m/s
Seema could easily hear her echo when she shouted in her schools multipurpose hall. Later she shouted in the same manner in her room at home but she was not able to hear any echo. Explain
Answer with Explanation:
Echo depends on "how sound waves are reflected back." A hard object, like the walls of the multipurpose hall, reflects sound waves well; thus, Seema could easily hear her echo. In addition to this, the walls of the hall are also smooth and this further allows the sound waves to bounce. On the other hand, soft objects like bed cushions in Seema's room absorbs sound. This prevents the sound waves from being reflected. In addition to this, the sound waves have hard time bouncing because there are many objects in Seema's room.
What kind of mixture is the gravel at the bottom of the fish tank?
Answer:
rock
Explanation:
(WILL GIVE BRAINLIEST IF YOU SHOW WORK) The force of friction between an object and the surface upon which it is sliding is 14N and the coefficient of friction between them is 0.72. What is the weight of the object?
f = 0.72 n
where f = magnitude of the friction force and n = mag. of the normal force. So we have
n = (14 N) / 0.72 ≈ 19.4 N
By Newton's second law, the object's weight and the normal force cancel, so that
n - m g = 0
where m = mass of the object and g = 9.8 m/s². Then the weight of the object is
m g = n ≈ 19 N
Materials such as rubber, plastics, and glass do not carry electrical currents and
are known as
Which example provides a complete scientific description of an object in motion?
Explain the answer for the below Question
What is the momentum of a 31.2 kg object traveling at a velocity of 2.1 m/s?
Answer:
p = 65.52 kg m/s
Explanation:
p = m × v
p = 31.2 × 2.1
p = 65.52 kg m/s
Which color of visible light has a longer wavelength than orange light?
A. Green
B. Red
C. Blue
D. Violet
Answer: B. Red
Explanation: I got it right
The correct answer is B. The color of visible light that has a longer wavelength than orange light is red light.
The electromagnetic spectrum is an array of all the frequencies of electromagnetic radiation.
Each frequency band is known as a different type of radiation, and they are classified in order of increasing frequency and decreasing wavelength.
Electromagnetic waves with a longer wavelength have a lower frequency, whereas waves with a shorter wavelength have a higher frequency.
The wavelength of electromagnetic radiation varies from about 1 × 10−16 meter (gamma rays) to more than 100 kilometers (radio waves).
The colors of the visible light are classified in order of increasing frequency and decreasing wavelength as: violet, blue, green, yellow, orange, and red.
Red light has the longest wavelength of all the visible light.
The wavelength of red light ranges from approximately 620 to 750 nanometers (nm), whereas orange light has a wavelength ranging from approximately 590 to 620 nm.
As a result, red light has a longer wavelength than orange light.
Therefore, the answer is B. Red.
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PLEASE HELP!!!! Compare and contrast electric potential energy and electric potential difference? Please use 2 content related sentences. (ref: p.577-587)
Answer:
Electric potential energy, Happens from conservative coulomb forces. It has a defined system.
electric potential difference Is (in the name) the difference between electric potential and the final and initial location.
Explanation:
5. A hiker accidentally drops an apple from a cliff. She observes that it hits the ground below after 2.4 s. If the apple accelerated at 10 m/s (gravity) while falling, how high was the
cliff?
cliff height -
וח
"Round your answer to the nearest thousandth if necessary,
Answer:
28.8m
Explanation:
Given parameters:
Time of fall = 2.4s
Acceleration due to gravity = 10m/s²
Unknown:
Height of cliff = ?
Solution:
To solve this problem, we use the expression:
H = ut + [tex]\frac{1}{2}[/tex]gt²
u is the initial velocity
t is the time taken
g is the acceleration
t is the time
H = 0x2.4 + [tex]\frac{1}{2}[/tex] x 10x2.4² = 28.8m
These data tables show the distance of various galaxies from Earth in millions of light-years (Mly) at different times. Which table supports the theory of expansion in the formation of the universe?
Answer: it’s b
Explanation:
I had two attempts to do the test first I picked c but I did it again it’s b .
Which correctly describes how the energy of a wave on the electromagnetic
spectrum depends on wavelength and frequency?
O A. Energy decreases with decreasing wavelength and decreasing
frequency
B. Energy increases with decreasing wavelength and decreasing
frequency
O C. Energy increases with decreasing wavelength and increasing
frequency
D. Energy decreases with increasing wavelength and increasing
frequency
Answer:
C. Energy increases with decreasing wavelength and increasing frequency
Explanation:
The capacitance of each capacitor is 1μF. Find the total capacitance
How much heat is absorbed by a 450g gold block as energy from the sun causes its temperature to change from 27°C to 32°C? (Specific heat capacity of gold is 0.47 cal/g°C) SHOW YOUR WORK *
Answer:
Q = 1057.5 [cal]
Explanation:
In order to solve this problem, we must use the following equation of thermal energy.
[tex]Q=m*C_{p}*(T_{final}-T_{initial})[/tex]
where:
Q = heat energy [cal]
Cp = specific heat = 0.47 [cal/g*°C]
T_final = final temperature = 32 [°C]
T_initial = initial temperature = 27 [°C]
m = mass of the substance = 450 [g]
Now replacing:
[tex]Q=450*0.47*(32-27)\\Q=1057.5[cal][/tex]
ccording to Newton's Second Law, what effect will doubling the mass of an object have?
A penny is dropped off the top of the Stratosphere from rest and falls freely with the
acceleration due to gravity (9.81 m/s2). After 5 seconds, how far has it fallen (Ax)?
Answer:
S = 122.5m
Explanation:
Given the following data;
Acceleration due to gravity = 9.8m/s²
Time, t = 5 seconds
Since it's a free fall, initial velocity, u = 0
To find the displacement, we would use the second equation of motion given by the formula;
[tex] S = ut + \frac {1}{2}at^{2}[/tex]
Where;
S represents the displacement or height measured in meters. u represents the initial velocity measured in meters per seconds. t represents the time measured in seconds. a represents acceleration measured in meters per seconds square.Substituting into the equation, we have;
[tex] S = 0*5 + \frac {1}{2}*(9.8)*5^{2}[/tex]
[tex] S = 0 + 4.9*25[/tex]
S = 122.5m.
Timed! I would really appreciate some help! thank you!
Andy runs for 30 minutes at a speed of 10km/h. How far did he run? (Hint: remember to convert the minutes to hours before calculating distance.) *
3km
5km
150km
Answer:
x = 5[km]
Explanation:
We must convert the time from minutes to hours.
[tex]t=30[min]*\frac{1h}{60min}= 0.5[h]\\[/tex]
We know that speed is defined as the relationship between space and time.
[tex]v=x/t[/tex]
where:
x = space [m]
t = time = 0.5 [h]
v = velocity [m/s]
Now replacing:
[tex]x = 10[\frac{km}{h} ]*0.5[h]\\x=5[km][/tex]
if a snail moves 6.5in/min, how many miles per hour does the snail travel?
Answer:
Unit Conversion
6.5in/min× 1ft/12in× 1 mile/5280ft= 0.001231 m/min0.001231 m/min× 60 min/1hr= 0.0738 miles/hrplease help answer worth 15!!
Answer:
Correct answers are B and C.
Explanation:
The line segment which exhibits a positive uniform accelaration if and only if [tex]\Delta v > 0[/tex] for [tex]\Delta t > 0[/tex]. According to this statement, the line segments B and C exhibits positive uniform accelerations, whereas line segments A and D have a constant velocity and line segments E exhibits a negative uniform acceleration.
Hence, correct answers are B and C.
Is the net force on an object moving with uniform velocity zero or not zero?
Answer:
Zero
Explanation:
The net force acting on an object moving with uniform velocity is zero. This is an accordance with the Newton's first law of motion.
Newton's first law of motion states that a body will continue in its state of rest or uniform motion unless it is acted upon by an external force.
Since this body is moving with uniform motion, it is not accelerating. When a body is acceleration, the net force on it is not zero.
But this one is moving with uniform motion. The net force on the body is balanced and zero.
Respostas
2 M
3 M
5 M
7 M
8 M
What is the net force acting on this box?
The net force acted on the box that shows in the attached image is to be considered as the 2N.
Calculation of the net force:Since the two forces are given i.e.. 3 N and 5N
So, here the net force be like
= 5N - 3N
= 2N
hence, The net force acted on the box that shows in the attached image is to be considered as the 2N.
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Just like other scientists and philosophers of his time, Archimedes believed the secrets of the universe could be revealed by thinking alone. *
True!
False!
The emission of light from a radioisotope occurs during ? decay.
Answer:
Gamma
Explanation:
The emission of light from a radioisotope occurs during Gamma decay.
What is radioisotope?The radioactive isotopes of an element are known as radioisotopes. Atoms with an unstable mix of neutrons and protons, or excess energy in their nucleus, are also known as neutron-proton atoms.What is Gamma decay?Gamma decay is a kind of radioactivity in which certain unstable atomic nuclei spontaneously discharge their surplus energy through an electromagnetic mechanism. Gamma rays (photons, or packets of electromagnetic energy, of extremely small wavelength) are released in the most frequent form of gamma decay, known as gamma emission.Hence , the correct answer is Gamma decay .
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NEWTONS SECOND LAW LAB REPORT
Answer:
Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass.
Explanation:
here this may help.
the gravitational potential energy of an object is due to
a .its mass
b .its acceleration due to gravity
c. its height above the earth' s surface
d .all of these
d. all of these
look at the picture to know from where we get this law with application on it
The value of (997)1/3 according to binomial theorem is
Answer:
9.99
Explanation:
The value of (997)^1/3
(997)^1/3
997 = (1000 - 3)
(1000 - 3)^1/3
Expanding :
[1000(1 - 3/1000)]^1/3
1000^1/3 * (1 - 3/1000)^1/3
Cube root of 1000
10 * (1 - 3/1000 * 1/3)
10 * (1 - 1/1000)
10 * (1 - 0.001)
10(0.999)
= 9.99
Hence, the value of (997)^1/3 according to binomial theorem is 9.99
The value of (997)^(¹/₃) according to binomial theorem is;
9.99
The value of
(997)^(¹/₃)
⇒ (1000 - 3)^(¹/₃)
Factorizing out common terms gives;
⇒ (1000)^(¹/₃) * (1 - 3/1000)^(¹/₃)
Using the given approximations from binomial theorem, we have;
⇒ 10(1 + (¹/₃ × -³/₁₀₀₀) ....
⇒ 10(1 - 0.001)
⇒ 10 × 0.999
⇒ 9.99
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what keeps both the cars pressed down on the road?
Answer:
Gravity
Explanation:
Petter performed an experiment to test which of the three compounds his teacher game him was an ionic compound. Which compound (A, B, or C) is most likely an ionic compound?
