Answer:
2.6m
Explanation:
The formula for calculating the wavelength is expressed as;
λ = v/f
v is the velocity
f is the frequency of vibration
Given
f = 7.80Hz
We need to get the velocity
For string;
f = V/2L
7.80 = V/2(1.3)
7.80 = V/2.6
V = 2.6 * 7.8
V = 20.28m/s
Get the required wavelength
λ = v/f
λ = 20.28/7.80
λ = 2.6m
Hence the wavelength of the first harmonic is 2.6m
Determine the specific heat of a certain metal if a 450 gram sample of it loses 34 500 Joules of heat as its temperature starts at 150 oC and drops to 53 oC.
Answer:
c = 0.4356 J/gK
Explanation:
Given the following data;
Mass = 450 grams
Initial temperature, T1 = 150°C
Final temperature, T2 = 53°C
Quantity of heat = 34500 Joules
To find the specific heat capacity of the metal;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
dt = T2 - T1
dt = 53 - 150
dt = -97°C
Converting the temperature in Celsius to Kelvin, we have;
dt = 273 + (-97) = 176 Kelvin
Making c the subject of formula, we have;
[tex] c = \frac {Q}{mdt} [/tex]
Substituting into the equation, we have;
[tex] c = \frac {34500}{450*176} [/tex]
[tex] c = \frac {34500}{79200} [/tex]
c = 0.4356 J/gK
HELPPPPPPPPPPPP so what's the difference between incidence ray and incident ray also refraction ray and reflection ray cuz i don't see any difference between them?
Answer:
incidence ray is the one that comes from the source and hits the object while reflected ray is the ray that leaves the object after striking it
Explanation:
Which of the following statements best describes the function of the muscular system?
A. Provides a way for the body to rid itself of waste in the form of gas, liquid or a solid.
B. Provides the body essential minerals needed to maintain homeostasis.
C. Provides movement of limbs, blood vessels, digestive organs and cardiac muscle.
D. Provides movement for the human body.
Explanation:
A is excretion
B is digestion
so my guess is c
The first harmonic of a string tied down at both ends has a frequency of 26 Hz. If the length of the string is 0.83 m, what is the speed of waves on the string?
Answer:
the speed of the wave on the string is 43.16 m/s
Explanation:
Given;
first harmonic of the wave formed by the string, f₀ = 26 Hz
length of the string, L = 0.83 m
The wavelength for first harmonic of the wave is calculated as;
L = N ----> N
L = λ₀/2
λ₀ = 2L
The speed of the wave on the string is calculated as follows;
v = f₀λ₀
v = f₀ x 2L
v = 26 x 2 x 0.83
v = 43.16 m/s
Therefore, the speed of the wave on the string is 43.16 m/s
1. Name two ways of applying forces ?
Answer: A force can be applied to another object by a direct push, pull, or drag.
Explanation:
Answer:
pushing ,pulling and dragging
what is velocity , plz answer ❤️
Answer:
Velocity is the speed of something in a given direction.
Explanation:
It is a vector quantity that indicates displacement, time, and direction. It is one of the concepts in kinematics, which is the branch of classical mechanics that describes the motion of bodies.
Hope this helps! :)
A ball has a 17 J of kinetic energy and its mechanical energy ls 25 Joule.
a. Find the gravitational potential energy of the ball.
Question:
A ball has a 17 J of kinetic energy and lB mechanical energy is 25 Joule
a. Find the gravitational potential energy of the ball.
b. if the ball has a mass of 3.2 kg, what is its height above the ground?
c. What is the speed of the ball?
Answer:
a. = 85
b. h = 0.25 m
c. = 3.26 m/s
Explanation:
Part A
PEgrav = m ו g • h
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity. So, to find:
GPE = ME - KE = 25 - 17 = 85
Part B
The formula simplifies to: h max = h + V₀² / (2 × g) and the time of flight is the longest.
The vertical velocity is equal to 0 (Vy = 0), and that's the case of horizontal projectile motion.
The equation may be written as:
GPE = mgh
8 = 3.2 × 10 × h
h = 0.25 m
Part C
The ball speed is calculated by dividing the distance by the time. If the time was 3 seconds, the average speed will be 60/3 = 20 feet per second (6.1 m/sec). KE = 1/2 MV²
17 = 1/2 × 3.2 x V²
V = 17 ÷ 1.6
Note, this is only the average ball speed, the speed of the ball at the time of release would be greater.
What is it called when two waves combine to form a new wave?
Answer:
interference
Explanation:
You can just search this.
define the concept national building
Segregation of alleles happens during the sex cell formation called ___.
A. translation
B. meiosis
C. sexual reproduction
D. transcription
Answer:
The answer to your question is sexual reproduction
Explanation:
Mark me brainliest (WHY?) cause my answer is correct
can someone help with #3? brainliest?
Answer:
vf = 7 m/s
Explanation:
3.
The final velocity of the ball right before it hits the ground can be found by using the third equation of motion:
[tex]2gh = v_f^2 - v_i^2[/tex]
where,
g = acceleration due to gravity = 9.81 m/s²
h = height = 2.5 m
vf = final velocity = ?
vi = initial velocity = 0 m/s
Therefore,
[tex]2(9.81\ m/s^2)(2.5\ m) = v_f^2 - (0\ m/s)^2\\v_f = \sqrt{49.05\ m^2/s^2}\\[/tex]
vf = 7 m/s
Series problem
What type of circuit is this?
What does the circle and the v represent?
What are the forces of nature that creates electromagnetism
Answer:
the electric force and the magnetic force.
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 2.9 s later. If the speed of sound is 340 m/s, how high is the cliff?
Answer:
h = 493 m
Explanation:
Given that,
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 2.9 s later.
The total distance covered by the rock is 2d. We know that,
Speed = distance/time
[tex]v=\dfrac{2d}{t}\\\\d=\dfrac{vt}{2}\\\\d=\dfrac{340\times 2.9}{2}\\\\d=493\ m[/tex]
So, the height of the cliff is equal to 493 m.
Which of the following factors should be considered when designing a personal fitness program?
A goals
В. activities
C. variety
D. all of the above
A 1.0-kg block of aluminum is at a temperature of 50°C. How much thermal energy will it lose when its temperature is reduced by half? The specific heat of aluminum is 897 J/(kg •K).
Answer:
22425 J
Explanation:
From the question,
Applying
Q = cm(t₂-t₁).................. Equation 1
Where Q = Thermal Energy, c = specific heat capacity of aluminium, m = mass of aluminium, t₂ = Final Temperature, t₁ = Initial Temperature.
Given: c = 897 J/kg.K, m = 1.0 kg, t₁ = 50 °C, t₂ = 25 °C (The final temperature is reduced by half)
Substitute these values into equation 1
Q = 897×1×(25-50)
Q = 897×(-25)
Q = -22425 J
Hence the thermal energy lost by the aluminium is 22425 J
Kara started a new exercise program. Kara’s sister works out with her on a regular basis and even talks to Kara about her progress. In this scenario, what is another name for Kara’s sister?
A.
goal-setter
B.
self-monitor
C.
support system
D.
nutritionist
Suppose that the ultrasound source placed on the mother's abdomen produces sound at a frequency 2 MHz (a megahertz is 10^610 6 Hz). Sound travels through tissue at roughly the same speed as in water (v\approx 1500v≈1500m/s). Find the maximum change in frequency between the sound that is emitted by the device and the sound that is observed at the wall of the baby's heart. Treat the heart wall as a moving observer. Hint: you will need to use your answer from part (a). Give your answer as a positive number in Hz.
Answer:
the maximum frequency observed is 2.0044 10⁶ Hz
Explanation:
This is a Doppler effect exercise. Where the emitter is still and the receiver is mobile, therefore the expression that describes the process is
f ’= [tex]f_o \ ( \frac{v \pm v_o}{v} )[/tex]
the + sign is used when the observer approaches the source
typical speeds of a baby's heart stop are around 200 m / min
let's reduce to SI units
v₀ = 200 m / min (1 min / 60 s) = 3.33 m / s
let's calculate
f ’= 2 10⁶ ([tex]\frac{1500 \ \pm 3.33}{1500}[/tex])
f ’= 2.0044 10⁶ Hz
f ’= 1,9956 10⁶ Hz
therefore the maximum frequency observed is 2.0044 10⁶ Hz
Which part of the microscope is responsible for enlarging the specimen?
A. magnifying parts
B. illuminating parts
C. mechanical parts
D. supporting parts
Answer:
A
Explanation:
magnifying = enlarging something or making it seem bigger
Which layer of the earth is the thickest?
A) Crust
B) Mantle
C) Outer core
D) Inner core
C) OUTER CORE
IT IS THE THICKEST
What is velocity ratio? It is impossible to get a perfect machine in practical life, why?
Explanation:
VELOCITY RATIO :- The ratio of a distance through which any part of a machine moves to that which the driving part moves during the same time.A train travels with a constant speed of 28 miles per hour. How long will it take to travel a distance of 112 miles? Show your calculations
Answer:
4 hours
Explanation:
Look closely at the diagram that shows a roller coaster car at various points along the ride. Use it to answers Questions 3–4.
Answer: theanswer is A
Explanation: it stops at the top
what is a plane mirror? state the characteristics of the image formed by a plane mirror
observation?
patulong po plss
Answer:
Magnetic field patterns of two permanent magnets.
Explanation:
From the attached picture, it can be observed that iron filings has been caused to align with respect to the magnetic fields of permanent the magnets. The concentration of the filings at some definite spots shows the poles of the magnet. This forms a magnetic field pattern.
This simply illustrates the effect of magnetic fields on iron filings by placing magnets below a paper or cardboard with iron filings on the top of the paper. The magnetic field pattern would be lost if the magnets are removed.
explain how a syringe draws injectable drug from a bottle
Answer:
When we pull the piston from inside to outside, a suction is created between the liquid and piston. This causes the liquid to move upwards and this allows us to draw a drug from a bottle
Explanation:
What do good electrical conductors and thermal conductors have in common?
Answer:
Usually, electrical conductors have loosely bound electrons. Materials that conduct heat are thermal conductors. ... Metals typically conduct both heat and electricity. Carbon conducts electricity as graphite, but insulates as diamond, so the form or allotrope of a material can be important
You should ALWAYS carry the microscope by placing your hand on the base of the microscope and gripping the red handle with your other hand. © True False
Answer:
true
Explanation:
place hand under base and one on the arm/handle
while doing supw at school,you found a picture of Guru rinpoche in a waste pit.what would be your course of action?
Question 20
When energy is added to a wave, how can the wave change? Select all that apply
А
The frequency can increase.
The wavelengin can inc
С
The frequency can decrease.
D
The amplitude can decrease.
E
The wavelength can decrease.
F
The amplitude can increase.
Answer:
I would say A, I hope this helped ; >