Explanation:
First Calculate Total Equivalent Resistance (Series) :
[tex]R_{eq} = r_{1} + r_{2} = 23 \: ohms[/tex]
(A) Current in each resistor :
[tex]I = \frac{V}{R} = 0.78 \: A[/tex]
(Since this is a series connection, the electric current is same through both resistor).
(B) Potential Difference across the first resistor :
[tex]V = IR = 0.78 \times 19 = 14.82 \: V[/tex]
(B) Potential Difference across the second resistor :
[tex]V = IR = 0.78 \times 4 = 3.12 \: V[/tex]
38. How would you dilute a concentrated solution...
Answer:
Water
Explanation:
A dilution is a solution made by adding more solvent to a more concentrated solution (stock solution), which reduces the concentration of the solute. An example of a dilute solution is tap water, which is mostly water (solvent), with a small amount of dissolved minerals and gasses (solutes).
~Hope this helps
What causes tides to occur?
The gravitational attraction between the Sun, Earth, and Moon.
The magnetic pull of the Earth's poles
The shaking of the earth during earthquakes
Seafloor spreading
Answer:
The gravitational attraction between the sun earth and moon
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 ; >
The Work-Energy Principle states that work is equal to the
change in kinetic energy. What unit measures these variables!
Answer:
the workenergy principle is measured in joules
True or False?
waves transfer the material from one location to another
Answer: False
Explanation:
PLEASE NO FILES. Ill give brainliest! 1. Which item below describes a quick change to
Earth's landscape?
A. a stone becoming smooth
B. dirt moving down a steep hill
C. flat land becoming a canyon
D. a glacier flattening the land below it
Answer:
B i think
Explanation:
plz let me know if wrong
Answer:
Yes it is B
Can you please mark Brainliest
A car accelerates at a rate of 4.00 m/swest for 5.0 seconds. What is the car's change in
velocity?
Answer:
20 m/s
Explanation:
Acceleration = Change in velocity/ time
4 = Change in Velocity/ 5
Change in velocity = 20 m/s
A 50kg block is at rest on the ground.
(a) Draw a diagram of the block and draw in the forces acting on the block (label these forces)
(b) Determine the magnitude and direction of weight of the block and the normal force acting on the block.
Answer:
(b) 490 N downwards
Explanation:
(b) Formula : w= mg
m is the mass of the object
g is a gravitational constant (9.8)
w= mg
= 50×9.8
= 490 N downwards
when a human cannon ball shoots in the air for 9 seconds, she travels 37 meters before ut lands. Caculate the speed
Answer:
9.1 mph
Explanation:
Match each sound feature to its description
amplitude
the density of the medium's particles
at the compressions of the wave
compression
the part of a wave where the particles
of the medium are farther apart
wavelength
the distance between compressions
or rarefactions
rarefaction
the part of a wave where the particles
of the medium are closer together
Intro
Done
tivity
be here to search
GOS
Answer:
1. Amplitude.
2. Rarefaction.
3. Wavelength.
4. Compression.
Explanation:
Sound are mechanical waves that are highly dependent on matter for their propagation and transmission. Some of the properties of sound waves as it travels through a medium such as solid, liquid and gas includes the following;
1. Amplitude: the density of the medium's particles at the compressions of the waves.
2. Rarefaction: the part of a wave where the particles of the medium are farther apart. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are separated by a greater distance.
3. Wavelength: the distance between compressions or rarefactions i.e the distance between two successive compressions or refractions.
4. Compression: the part of a wave where the particles of the medium are closer together. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are closer together.
Answer:
here is the answers .......
The international space station (ISS) orbits the earth with a velocity 7.6 km/s. How much energy is required to lift a payload of 2500 kg from the surface of the earth to the ISS
Answer:
7.22×10¹⁰ J
Explanation:
From the question given above, the following data were obtained:
Velocity (v) = 7.6 Km/s
Mass (m) = 2500 kg
Energy (E) =?
Next, we shall convert 7.6 Km/s to m/s. This can be obtained as follow:
1 km/s = 10³ m/s
Therefore,
7.6 Km/s = 7.6 Km/s × 10³ m/s / 1 km/s
7.6 Km/s = 7.6×10³ m/s
Finally, we shall determine the energy required as follow:
Velocity (v) = 7.6×10³ m/s
Mass (m) = 2500 kg
Energy (E) =?
E = ½mv²
E = ½ × 2500 × (7.6×10³)²
E = 1250 × 57760000
E = 7.22×10¹⁰ J
Thus, 7.22×10¹⁰ J of energy is required.
the distance and direction between starting and ending positions
Answer:
The length traveled by an object moving in any direction or even changing direction is called distance. The location of an object in a frame of reference is called position. For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement
Explanation:
good luck
What is the connection between the x- and y-motions of a projectile?
A. time
B. gravity
C. velocity
D. height
A gas has a volume of 3.00 L at 10.0 °C.
What is the temperature of the gas if it
expands to 6.00 L, assuming constant pressure?
When you rub your feet on a carpet and then go to touch a door knob you may receive a shock! This is the result of millions of....moving in a
matter of seconds.
Answer:
I need points cri
Explanation:
Answer:
Electrons
Source:
https://kidshealth.org/en/kids/electric-shock.html#:~:text=When%20you%20touch%20a%20doorknob,quick%20movement%20of%20these%20electrons.
as the change in speed at the boundary of two materials is greater what happened to the angle of refraction (please help )
a. it becomes less
b. it becomes more
c. it stays the same
If the air is only holding one-third as much moisture as it can possibly hold
Answer:
humoidity
Explanation:
During a science lesson on changes, Ms. Sloan's students made mixtures of sulfur (the yellow substance) and iron filings (the black substance. Ms. Sloan challenged her students to separate the two substances and one group easily completed the task by using a magnet to lift the iron filings from the mixture. Next, Ms. Sloan poured the same mixture into a test tube and heated it in the Bunsen burner flame. What was the result of heating the mixture?
Answer:
Both substance will melt and become a solution.
Explanation:
When a mixture of iron filings (black substance) and sulphur powder (yellow substance) are heated in a test tube under a bunsen burner, usually they will undergo a chemical reaction where they will melt to form a new solution of ferrous sulphide.
Thus, we can say what happens is that both substances melt to form a solution.
Can someone please help me with science
Imangine a car moving down a street. From which reference point would the street appear to be moving?
A: From the sky
B:From the street
C:From the car
D: From the sidewalk
What percentage of high school students did not meet the recommended level of physical activity in one study?
A.
25%
B.
45%
C.
65%
D.
85%
Answer:
c
Explanation:
what poping
the instrument used in measuring the speed of wind is called
Answer:
please give me brainlist and follow
Explanation:
Anemometers
The anemometer counts the number of rotations, which is used to calculate wind speed. An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are important tools for meteorologists, who study weather patterns.
how are a grassland ecosystem and a pond ecosystem connected?
Answer:
terrestrial ecosystem and pond ecosystem is an aquatic ecosytem, hence both their abiotic and biotic components would be different.
Explanation:
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
The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is __________V when the concentration of Zn2+ = 1.0 M and the
concentration of Pb2+ = 2.0 x 10-4 M.
Pb2+(aq) + Zn(s) ---> Zn2+(aq) + Pb(s)
Answer:
0.52 V
Explanation:
From Nernst equation;
Ecell =E°cell - 0.0592/n log Q
E°cell = +0.63 V
[Zn2+] =1.0 M
[Pb2+] = 2.0 x 10-4 M
n = 2
Ecell = 0.63 - 0.0592/2 log[1.0/2.0 x 10-4]
Ecell = 0.63 - 0.11
Ecell = 0.52 V
Una mujer de masa m está parada en el borde de una mesa giratoria horizontal de momento de inercia I y radio R. La mesa al principio está en reposo y tiene libertad de moverse alrededor de un eje vertical sin fricción que pasa por su centro. La mujer empieza a caminar alrededor de la orilla en direción de las manecillas del reloj (vista desde arriba) a una velocidad constante v en relación a la Tierra.
a) En qué dirección y con qué velocidad angular gira la mesa?
b) Cuál es el trabajo efectuado por la mujer para poner en movimiento la mesa?
r
[tex]- \frac{mR^2 }{I } \ v[/tex]Answer:
a) w = - [tex]\frac{m r }{I} v[/tex] , b) W = - ½ m_woman R² (1 + m_woman R / I²) v²
Explanation:
a) To solve this exercise, let's use the conservation of angular momentum.
We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved
initial instant. Before starting to move the woman
L₀ = 0
final instant. After starting to move
L_f = I w + m v r
the moment is preserved
L₀ = L_f
0 = Iw + m v r
w = - [tex]\frac{m r }{I} v[/tex] (1)
the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise
b) for this part we use the relationship between work and kinetic energy
W = ΔK
in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables
v = w r
we substitute
W = 0 - ½ I_total w²
I_total = I + m_{woman} R²
W = - ½ (I + m_woman R²) ( [tex]\frac{m_{woman} R}{I} \ v[/tex]) ²
W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²
W = - ½ m_woman R² (1 + m_woman R / I²) v²
can u get this right?
Lloyd walks faster than
Ronald, with a speed of
about 0.65 m/s. The canteen
is 15 meters away from their
dassroom. How many
minutes will take her to go
to the canteen?
Answer:
Time = 2.6 minutes
Explanation:
Given the following data;
Speed = 0.65 m/s
Distance = 15 meters
To find the time to get to the canteen;
Mathematically, time is given by the formula;
Time = distance/speed
Substituting into the formula, we have;
Time = 15/0.65
Time = 23.08 seconds
To minutes = 60/23.08 = 2.6 minutes
Mark the correct statement: a) Charges flow through a circuit b) voltage is applied across the circuit c) voltage is the ratio of energy per coulomb of charge d) All of the above e) none of the above
Answer:
The correct option is;
d) All of the above
Explanation:
a) In an electric circuit through which electric current flows, it is due to the electric charges which can be the negatively charged electrons or the positively charged protons
b) Voltage is the potential difference that results in current flowing through the circuit, therefore, the voltage is applied across the circuit through which current flows
c) The voltage which is the electric potential difference is the change in potential energy in joules of a given system due to the movement of a test charge (in Coulombs) between points in the electric field, ΔE, divided by the value of the test charge, 'q'
V = ΔE/q
Therefore, all of the above are correct.
in which of the following does enstein's famous equation apply?
A. a driver brings a car to a halt
B. collisions between objects
C. water falling in a waterfall
D. nuclear fission and fusion reaction
Answer:
D
Explanation: