Jenny and Fred both play a long note on their trombones. A stationary observer hears the sound increasing and decreasing repeatedly in loudness. Which of these must be true?
A.The sound waves from the two trombones have slightly different frequencies.
B. The sound waves from the two trombones have the same frequency.
C. The sound waves from the two trombones have slightly different amplitudes.
D. The sound waves from the two trombones have the same wavelength.
E. The sound waves from the two trombones have slightly different velocities.
Answer:
A.The sound waves from the two trombones have slightly different frequencies.
Explanation:
This is because, a difference in frequency of waves from two different sources would result in either constructive or destructive interference of the waves. Thereby, causing the observer to hear the sound increasing or decreasing.
Answer:
A.The sound waves from the two trombones have slightly different frequencies.
What energy transformations take place in Joule's system?
El dibujo muestra donde se encuentra un caracol en distintos instantes de tiempo.?Podemos afirmar que se trata de un movimiento acelerado?Razona tu respuesta
Answer:
if the acceleration is zero the displacements are equal in the same time interval, so we would see the points equally spaced in the diagram
if the acceleration is different from zero in these cases the intervals are different in the same time intervals
Explanation:
In a drawing of displacement as a function of time, we can know if in motion it is steely or not, the relationship that describes the motion is
x = v₀ t + ½ a t²
we see that we have two cases:
* if the acceleration is zero the displacements are equal in the same time interval, so we would see the points equally spaced in the diagram
* if the acceleration is different from zero in these cases the intervals are different in the same time intervals. In the case of positive acceleration the points are spaced and in the chaos negative acceleration the points are getting closer to each other
1. In a certain semiconducting material the charge carriers each have a charge of 1.6 x 10-19 C. How many are entering the semiconductor per second when the current is 2.0 nA?
Answer:
The number of charges is 1.25 × 10¹⁰
Explanation:
Current is the amount of charge flowing through a conductor per second. The formula for current (I) is given as:
I = Q/t
Where Q is the charge flowing in coulombs and t is the time taken in seconds.
Given that I = 2.0 nA = 2 × 10⁻⁹ A and t = 1 sec
I = Q / t
Q = It = 2 × 10⁻⁹ × 1 = 2 × 10⁻⁹ C
Since each charge = 1.6 x 10⁻¹⁹ C, therefore:
The number of charges = 2 × 10⁻⁹ C / 1.6 x 10⁻¹⁹ C = 1.25 × 10¹⁰
Explain why beaches can be considered both erosional and depositional. Remember to write in complete sentences!
Answer:
Waves wash against the shore which can lead to erosion. However, the waves also bring in pebbles and sand particles from the ocean, which is an example of deposition.
Explanation:
That would be my answer
What is the formula for velocity???
Explanation:
divide the distance by the time it takes to travel that same distance, then add your direction to it.
Or change in displacement divided by change in time.
I’m a freshman, I got a 80% in the first quarter, 85% in the second and 70% in the third. I have a 46% in the fourth and 34 total absences in the class. If I fail, will I fail the class or the entire grade
Answer:
you will pass but if your grade become lower and u get more absences you will fail
The electromagnetic wave that CT scans are based on is called a
Answer:
d
Explanation:
In an inelastic collision, which of the following statements is always true?
[A] Kinetic energy is conserved in the collision.
[B] Momentum is conserved in the collision.
[C] After the collision, the objects always merge into one.
[D] The collision takes more that 1 second to complete.
Answer: A
Explanation:
A
you drop a rock off of a cliff, and it hits the ground 8.1 seconds later. how tall is the cliff?
Answer:
the answers is 321 m
Explanation:
here's a picture of it
is hydrogen good conductor or poor conductor
Answer:
Good one
Explanation:
Hydrogen has the highest thermal conductivity of any gas.
What features of your design helped your rocket hit the target?
Answer:
What features of your design helped your rocket hit the target? (Key factors include the rocket's weight, launch angle, ability to fly straight, and the balloon's pressure.) After testing, what changes did you make to your rocket and launcher? (Answers will vary.)
Explanation:
PLEASE GIVE ME BRAINLIEST IF NEW YOULL SEE NEAR MY ANSWER MARK AS BRAINLIEST IF NOT YOULL HAVE TO WAIT A DAY AND BRAINLY WILL REMIND YOU
Rafael swings a baseball bat with a force of 25 N. The baseball bat exerts a force of 5 N on the baseball. What is the mechanical advantage of the baseball bat? The mechanical advantage of the baseball bat is
Answer:
0.2
Explanation:
Mechanical Advantage is defined as the ratio of force output with respect to the force input. Thus,
MA = output / input
MA = 5 / 25
MA = 1/5
MA = 0.2
Since this value is less then one. Even though it's tagged a mechanical advantage, in reality it would be mechanical disadvantage.
Therefore, we can say that the mechanical advantage of the baseball bat is 0.2
Answer:
0.2
Explanation:
En la etiqueta de un bote de fabada de 350 g, leemos que su aporte energético es de 1630 kj por cada 100 g de producto a) La cantidad de fabada que tiene que comer un hombre si su necesidad energética diaria es 2500 kj para sobrevivir b) El aporte calórico del bote de fabada en calorías
Answer:
(a) 153.37 g
(b) 5705 kJ
Explanation:
(a) To find the amount of bean needed by a man you first calculate the equivalence in beans to 2500kJ
[tex]2500kJ*\frac{100g}{1630kJ}=153.37\ g[/tex]
Thus, 153.37 g has the energy needed by a man that needs 200kJ per day.
(b) The amount of energy per pot of bean is given by:
[tex]E=350g*\frac{1630kJ}{100g}\\\\E=5705\ kJ[/tex]
Thus, the energy is 5705kJ
In which sound wave application are sound waves absorbed?
Answer: ultrasonic cleaners
Explanation:
To solve this we must be knowing each and every concept related to sound wave. Therefore, in ultrasonic cleaners, sound waves are absorbed.
What is sound wave?A sound is a type of energy or a vibration that moves through a material such as air or water. Sound may pass through such a gaseous medium as well. It is anything that is audible. The velocity of sound varies depending on the medium.
A wave is a medium that transmits energy from one location to another. Waves are classified into three types: transverse waves, longitudinal waves, or surface waves.
Transverse waves transport the material back and forth in a right angle towards the energy movement. Longitudinal waves transmit energy through compressing then expanding the medium, allowing the energy to travel ahead. In ultrasonic cleaners, sound waves are absorbed.
Therefore, in ultrasonic cleaners, sound waves are absorbed.
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What is true of a match burned in a closed system?
Answer:
The match is made of wood or paper, mainly cellulose, a carbohydrate. When it burns, carbon and hydrogen combine with oxygen in the air and go off into the atmosphere. The match loses mass, but the mass goes somewhere else—in this case, the atmosphere. When a match burns, its mass decreases
Explanation:
PLEASE GIVE ME BRAINLIEST IF NEW IT SHOULD SAY NEAR MY ANSWER MARK AS BRAINLIEST IF NOT YOULL HAVE TO WAIT A DAY AND BRAINLY WILL REMIND YOU
How far can you get away from your little brother with a paintball marker if you can travel at 3 m/s and you have 15s before he sees you?
An ice skater spins at 2.5 rev/s when his arms are extended. He draws his arms in and spins at 10.0 rev/s. By what factor does his moment of inertia change in the process?
Answer:
The moment of inertia decreased by a factor of 4
Explanation:
Given;
initial angular velocity of the ice skater, ω₁ = 2.5 rev/s
final angular velocity of the ice skater, ω₂ = 10.0 rev/s
During this process we assume that angular momentum is conserved;
I₁ω₁ = I₂ω₂
Where;
I₁ is the initial moment of inertia
I₂ is the final moment of inertia
[tex]I_2 = \frac{I_1 \omega_1}{\omega_2} = \frac{I_1*2.5}{10} \\\\I_2 = 0.25I_1 = \frac{1}{4}I_1[/tex]
Therefore, the moment of inertia decreased by a factor of 4
Can someone please help me? If somebody pushes a cart with 4N of force and the cart moves a distance of 2 meters, how much work did they do?
Answer:
Work done, W = 8 J
Explanation:
We have,
Force acting on the cart is 4 N
Cart covers a distance of 2 m
We need to find the work done by the cart. Work done by an object is given in terms of force and displacement. It can be given by :
[tex]W=Fd\\\\W=4\ N\times 2\ m\\\\W=8\ J[/tex]
So, the work done by the cart is 8 J.
a man is trying to move a piano by himself, but it will not move, what force must they overcome to start the piano moving?
Answer:
The friction of the piano and the weight
Explanation:
Are carbon compounds rigid and strong
why are the group 17 elements the most reactive of the nonmetal elements a)they are the biggest elements b)they have the fewest electrons c)they are located on the farthest right side of the periodic table d)they require only one electron to fill their outer energy level
Answer:
I think the answer is D-they require onky one electron to fill their outer energy level.
A walkman uses four standard 1.5 V batteries. How much resistance is in the circuit if it uses a current of 0.02A? *
Answer:
75ohms
Explanation:
V= IR
V = 1.5volts
I = 0.02A
1.5 = 0.02×R
Making R the subject
R = 1.5/0.02
R = 75ohms
The resistance in the circuit will be 75ohms
A metal rod has a length of 123. cm at 200°C. At what temperature will the length be 92.6 cm if the coefficient of linear expansion of the material in the rod is 2.0 x 10-5 °C-1?
Answer:
[tex]\theta_{2} = 15400^0 C[/tex]
Explanation:
The formula for linear expansivity, [tex]\alpha = \frac{l_{2} - l_{1} }{l_{1} ( \theta_{2} - \theta_{1} )}[/tex]
original length, l₁ = 123 cm = 1.23 m
final length, l₁ = 92.6 cm =0.926 m
original temperature, θ₁ = 200°C
Linear expansivity, α = 2 * 10⁻⁵ °C⁻¹
Putting these values into the formula:
[tex]2 * 10^{-5} = \frac{1.23 - 0.926 }{l_{1} ( \theta_{2} -200 )}\\ \theta_{2} -200 = \frac{0.304}{2 * 10^{-5} } \\\theta_{2} = 15200 + 200\\\theta_{2} = 15400^0 C[/tex]
4. The batteries on electric vehicles are recharged using electricity from either a wall socket or dedicated charging
unit.
A) O True
B) O False
Answer:
Hey!
Your answer is A) TRUE!
Explanation:
The electricity in this instance is called "grid-electricity" because it has come from a generation plant elsewhere instead of recharging the batteries via Kinetic/Potential energy...
The half-life of cobalt-60 is 5.26 years. If 50 grams are left after 15.78 years, how many grams were in the original sample?
Answer:
Explanation:
Half life = 5.6
no of half life in 15.78 years = 15.78 / 5.26
= 3 .
[tex]N = N_0(\frac{1}{2})^n[/tex]
N₀ is original mass , N is mass after n number of half lives.
Inserting the given data in the equation above
[tex]50 = N_0(\frac{1}{2})^3[/tex]
N₀ = 50 x 2³
= 400 gm .
original sample will contain 400 gms of sample.
Which phrases describe all the outer planets’ motion? Select two options.
no rotation
fast rotation
slow revolution
opposite revolution
north to south rotation
Answer:
Fast rotation
Slow revolution
Explanation:
Solar system has 8 planets. 4 inner rocky planets - Mercury, Venus, Earth and Mars and 4 outer gaseous planets - Jupiter, Saturn, Uranus and Neptune. The outer planets have few common features.
They are gaseous. There period of revolution is larger than the inner planets which means that they have slow revolution about the Sun. One day on the outer planets is smaller than the inner planets which means they have fast rotation.
For example, Jupiter has revolves around sun in 11.86 Earth years and rotates about axis in 9.8 Earth hours. Uranus revolves around sun in 84 Earth years and rotates on its axis 17.9 Earth hours.
Answer:
Fast rotation
Slow revolution
Explanation:
did the test
Two water waves meet at the same point, one having a displacement above equilibrium of 60 cm and the other having a displacement above equilibrium of 80 cm.
Answer:
The resultant displacement is 140 cm
Explanation:
say first displacement d₁ is 60 cm
and second displacement d₂ is 80 cm
Resultant displacement = d₁ + d₂
= 60 + 80
= 140 cm
Answer:
Explanation:
To solve this problem it will be necessary to apply the interference principle.
Under this principle interference is understood as a phenomenon in which two or more waves overlap to form a resulting wave of greater, lesser or equal amplitude. In this case, if both are at the same point, the result of the total displacement will be the sum of the individual displacements, therefore
[tex]x = \sum h_i\\\\x = 60cm + 80cm\\\\x =140cm[/tex]
Therefore the resulting displacement above equilibrium is 140cmA CFL bulb has an efficiency of 0.42 and a imput of 14W. what is the output power
I really need help.
Answer:
The output power is 5.88 W.
Explanation:
We have,
Efficiency of CFL bulb is 0.42
Input power is 14 W
It is required to find the output power. The ratio of output power to the input power is called efficiency. It is given by :
[tex]\eta=\dfrac{P_o}{P_i}[/tex]
[tex]P_o=\eta\times P_i\\\\P_o=0.42\times 14\\\\P_o=5.88\ W[/tex]
So, the output power is 5.88 W.
Work out the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s.
Answer: 5 joules
Explanation:
mass=m=2.5kg
Velocity=v=2m/s
Kinetic energy=ke
ke=(m x v x v)/2
ke=(2.5 x 2 x 2)/2
Ke=10/2
Ke=5
Kinetic energy=5 joules
The kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s is 5 Joules.
What is kinetic energy?The energy which an item has as a function of motion is determined by the initial energy. It is described as the effort required to propel a material body from rest to the given velocity.
It is given that:
Mass of the remote-controlled car = 2.5 kg
Velocity of the car = 2 m/s
As we know,
Kinetic energy = k
k = (mv²)/2
As we know,
The mass is a tangible body's mass is the amount of matter it possesses. It's also a metric of inertia or the resistance to velocity when a net force is exerted.
m = 2.5 kg
v = 2 m/s
k = (2.5×2²)/2
k = 10/2
k = 5 Joules
Thus, the kinetic energy of a 2.5 kg remote-controlled car that is moving at 2 m/s is 5 Joules.
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