Courtney wants to practice doing science. Which example best illustrates her
using inquiry?
A. Courtney decides to drop several different objects off her
apartment's porch to see which falls the fastest.
B. Courtney pays close attention in her physical science class to see
if her teacher explains the speed of falling objects.
C. Courtney reads about the history of the study of gravity and learns
about why scientists first studied falling objects.
D. Courtney finds a calculation that explains the speed of falling
objects. She tries to understand the calculation by writing it down.
Answer:
A
Explanation:
because she wants to practice science and A is the practical option.
Katie and her sister have entirely different features and traits. Katie has blond hair and brown eyes, but her sister has red hair and blue eyes. What causes these variations in traits such as hair color, eye color, and height?
A. competition
B. offspring
C. alleles
D. fitness
Answer:
C. Alleles
Explanation:
Our genes are responsible for our phenotype (physical traits). Alleles is the only genetic term in there.
1. explain why nichrome wire used in the heater.
2. explain why copper wire not used in the heater.
Answer:
1. The reason why nichrome wire is used in a heater is due to the properties of nichrome which makes it a material of choice for heating application including;
i) The cost of manufacture of nichrome is low
ii) Nichrome has both high mechanical and creep strength, and therefore is suitable for installation and use in a wide setting
iii) Nichrome has a high resistance to electron flow, making it a good electrical heating element
iv) Nichrome has a high resistance to oxidation, such that it can be reused several times as a heater
v) The high ductility of nichrome allows it to be stretched and drawn around different vessels with contents to which heat is to be supplied
2. Copper wire is not used in heaters because according to Joule's law, the heat produced from the flow of electric current, 'I', through a material having a resistance, 'R', for a time, 't', is proportional to I²·R·t, and copper has a very low resistance, 'R', to the flow of electric current, and therefore, will not produce sufficient heat required at a given current level
Explanation:
An ohmic dipole of resistance 100 ohm is crossed by a current of intensity 120 ma. Calculates the voltage across this chemical dipole
Answer:
12.0 Volt
Explanation:
Step 1: Given data
Resistance of the ohmic dipole (R): 100 Ohm
Intensity of current (I): 120 mA (0.120 A)
Step 2: Calculate the voltage (V) across this chemical dipole
To calculate the voltage across the ohmic dipole, we will use Ohm's law.
I = V/R
V = I × R
V = 0.120 A × 100 Ohm = 12.0 V
Do solar panels create enough energy to power the car throughout the day?
Answer:
Yes, but only if it's sunny.
Explanation:
As you know, solar panels generate energy through the sun's rays of light (better known as sunlight). Therefore, as long as the sun is shining high in the sky, the car will generate electricity and be able to function. If this vehicle was only powered by solar panels, it would not function during the night, in cloudy areas, and/or in dark places (such as parking garages or home garages).
Hope this helps!
Which of these events is an example of resonance?
A- a bridge collapses due to the overloading of vehicles using it.
B-A baker kneads dough by pounding it repeatedly
C-The sound of teo guitars changes from loud to soft every second
D- An ambulance siren rises and falls in frequency as it passes by you
E-An opera singer breaks a thin glass with only the use of her high frequency voice
Answer: E- An opera singer breaks a thin glass with only the use of her high frequency voice
Explanation:
Resonance is when a person is able to evoke emotions or when a person is deep in character. It is the ability to evoke memories, images and emotions.
Examples of resonance include old pictures which has emotional attachments, feel voice of a singer etc.
Therefore, the event that is an example of resonance is an opera singer breaks a thin glass with only the use of her high frequency voice.
name 4 element of weather
Answer:
They are temperature, atmospheric pressure, wind, humidity, precipitation, and cloudiness. Together, these components describe the weather at any given time.
Which on the following subatomic particles can modify on an object
A: electrons
B: neutrons
C: protons
Answer:
electrons i think
Explanation:
Compare and contrast mental health and emotional health.
Answer: hey, i hope this hlps!~~~ Part of mental health is how well your mind processes and understands information and experiences. In contrast, emotional health involves your ability to manage and express the emotions that arise from what you have learned and experienced.
Explanation:
Calculate the cost of running an electric laundry iron for 8 hours, if the cost of 1 unit of energy is N24.00 and the rating of the iron is 1200w,240v
Answer:
Cost of energy = N230.4
Explanation:
Given the following data;
Time = 8 hours
Power = 1200 W
Voltage = 240 V
Cost of energy = N24
To find the cost of running an electric laundry iron;
First of all, we would determine the energy consumption of the iron.
Energy = power * time
Energy = 1200 * 8
Energy = 9600 Watt-hour = 9.6 Kwh (1 Kilowatts is equal to 1000 watts).
Next, we find the cost of energy;
Cost of energy = 9.6 * 24
Cost of energy = N230.4
La alegría es la vacuna para eliminar la tristeza, pero para obtenerla, ¿qué se debe hacer? Explica:
Which one of the patterns is the quietest?
Answer:
A
Explanation:
A cheerleader jumps off from the shoulders of two of her teammates. They all fell at the same rate, as a result. This type of collision is...?
Answer:
elastic collision
Explanation:
please helpppp... thank u ❤️
Answer:
For Ryan:
[tex]at \: highest \: point : v = 0 \\ velocity = 0 \: {ms}^{ - 1} [/tex]
For the football kicked:
[tex]s = ut - \frac{1}{2} g {t}^{2} \\ for \: range : s = 0 \\ u \sin( \theta) = \frac{gt}{2} \\ t = \frac{2u \sin(\theta) }{g} \\ range(x) = ut \\ x = \frac{ {2u {}^{2} \sin(\theta) }^{} }{g} \\ \frac{50 \times 9.8}{ {2318.9}^{} } = \sin(\theta) \\ \\but \: 0 = u \sin(25) - 2 \times 9.8 \times 50 \\ u = 2318.9 \: {ms}^{ - 1} \\ \theta = 12.2 \degree[/tex]
Answer:
the highest point for the first question is 0 meters per second
the answer for question 2 is 45 degrees
Can anybody answer ??
Answer:
C. Electromagnetic wave
Explanation:
Please give me brainliest
Answer:
C. electromagnetic
Explanation:
because 5g uses higher frequency radio waves a type of electromagnetic radiation which are within the spectrum considered safe.
2 Ten identical lengths of wire are laid closely side-by-
side. Their combined width is measured and found
to be 14.2 mm. Calculate:
a the radius of a single wire
b the volume in mm' of a single wire if its length is
10.0 cm. (Volume of a cylinder = ferih, where r =
radius and h = height.
Answer:
(a) 0.71 mm
(b) 0.158 cubic cm
Explanation:
The width of one wire is the diameter of the wire.
(a) Let the diameter of each wire is d.
So, 10 d = 14.2 mm
d = 1.42 mm
radius of each wire, r = d/2 = 1.42/2 = 0.71 mm
(b) Length, L = 10 cm
The volume of the single wire is given by
[tex]V =\pi\times r^2\times h \\\\V =3.14\times 0.071^2\times 10\\\\V =0.158 cm^3[/tex]
what are the horizontal and vertical components of a vector that is 25units long with an angle of 130 degrees
Answer:
The horizontal component of the vector ≈ -16.06
The vertical component of the vector ≈ 19.15
Explanation:
The magnitude of the vector, [tex]\left | R \right |[/tex] = 25 units
The direction of the vector, θ = 130°
Therefore, we have;
The horizontal component of the vector, Rₓ = [tex]\left | R \right |[/tex] × cos(θ)
∴ Rₓ = 25 × cos(130°) ≈ -16.06
The horizontal component of the vector, Rₓ ≈ -16.06
The vertical component of the vector, R[tex]_y[/tex] = [tex]\left | R \right |[/tex] × sin(θ)
∴ R[tex]_y[/tex] = 25 × sin(130°) ≈ 19.15
The vertical component of the vector, R[tex]_y[/tex] ≈ 19.15
(The vector, R = Rₓ + R[tex]_y[/tex]
[tex]\underset{R}{\rightarrow}[/tex] = Rₓ·i + R[tex]_y[/tex]·j
∴ [tex]\underset{R}{\rightarrow}[/tex] ≈ -16.07·i + 19.15j)
A cubic box has a 0.8 meter side. Find the volume of air in the box in cubic meter?
Answer:
[tex]V=0.512\ m^3[/tex]
Explanation:
Given that,
The side of a cubic box, s = 0.8 m
We need to find the volume of air in the box.
We know that,
The volume of a cube is given by :
[tex]V=s^3[/tex]
So,
[tex]V=0.8^3\\\\V=0.8\times 0.8\times 0.8\\\\=0.512\ m^3[/tex]
So, the volume of air in the box is [tex]0.512\ m^3[/tex].
Transforma las siguientes unidades utilizando factores de conversión (no vale poner el número solo) a. 85 atm a mmHg b. 60 Pa a atm c. 780 mmHg a Pa d. 740 mmHg a atm
Answer:
a. 6.5 × 10⁴ mmHg
b. 5.9 × 10⁻⁴ atm
c. 1.0 × 10⁵ Pa
d. 0.97 atm
Explanation:
Transformaremos las siguientes unidades utilizando factores de conversión.
a. 85 atm a mmHg
Usaremos el factor de conversion 1 atm = 760 mmHg.
85 atm × 760 mmHg/1 atm = 6.5 × 10⁴ mmHg
b. 60 Pa a atm
Usaremos el factor de conversion 1 atm = 101325 Pa.
60 Pa × 1 atm/101325 Pa = 5.9 × 10⁻⁴ atm
c. 780 mmHg a Pa
Usaremos el factor de conversion 760 mmHg = 101325 Pa.
780 mmHg × 101325 Pa/760 mmHg = 1.0 × 10⁵ Pa
d. 740 mmHg a atm
Usaremos el factor de conversion 1 atm = 760 mmHg.
740 mmHg × 1 atm/760 mmHg = 0.97 atm
what are the horizontal and vertical components of a vector that is 25units long with an angle of 130 degrees
Answer:
The horizontal component of the vector is approximately -16.07
The vertical component of the vector is approximately 19.15
Explanation:
A vector quantity is a quantity that posses both magnitude and direction specifications
The magnitude of the given vector, R = 25 units
The direction of the vector, θ = 130°
Therefore the location of the vector, starting from the origin of the Cartesian plane, is in the second quadrant having an angle of 180° - 130° = 50° to the horizontal
Given that the x-coordinate is negative in the second quadrant, we have;
The horizontal component of the vector, Rₓ = The x-coordinate of the vector = R×cos(θ)
∴ The horizontal component of the vector, Rₓ = 25 × cos(130°) = -25 × cos(50°) ≈ -16.07
The horizontal component of the vector, Rₓ ≈ -16.07
The vertical component of the vector, [tex]R_y[/tex] = The y-coordinate of the vector = R×sin(θ)
∴ The vertical component of the vector, [tex]R_y[/tex] = 25 × sin(130°) ≈ 19.15
The vertical component of the vector, [tex]R_y[/tex] ≈ 19.15
The vector can be resolved as R = -16.07·i + 19.15·j
Derive the relation between wavelength, frequency and speed of sound.
Explanation:
sorry I need some points foe this
Which of the following is an elastic collision?
A.
A wad of gum sticking to a window
B.
Two cars colliding and sticking together
C.
A vase falling to the floor and shattering
D.
A tennis racquet hitting a ball
Answer: D
Explanation:
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions. Suppose two similar trolleys are traveling toward each other with equal speed.
Yea this question is difficult for me ive been trying to answer this for 40 mins
Answer:
it is difficult
my best answer would be a. 6
hope its right!!
===========================================
Explanation:
The half-life formula is
y = A*(1/2)^(x/H)
where A is the starting amount, H is the half-life, x is the time value and y is the amount after x units of time have passed.
I'll express the x and H values in terms of millions of years. So for example, when we say H = 500, then that really refers to 500 million years.
----------
In this case, we know that,
A = 192H = 500y = 3Let's use those values to solve for x. We'll need logs to cut the exponents down from the trees.
y = A*(1/2)^(x/H)
3 = 192*(1/2)^(x/500)
3/192 = (0.5)^(x/500)
0.015625 = (0.5)^(x/500)
log(0.015625) = log( (0.5)^(x/500) )
log(0.015625) = (x/500)*log(0.5)
(x/500)*log(0.5) = log(0.015625)
x = 500*log(0.015625)/log(0.5)
x = 3,000
Keep in mind that x is in millions of years. So saying x = 3,000 means 3,000 million years. This translates to 3,000*10^6 = 3,000,000,000 = 3 billion years.
It will take about 3 billion years for the 192 atoms to decay to only 3 atoms.
The amount of half-lives this occurs is x/H = (3,000)/500 = 6
So the time span of 3 billion years is the same as 6 half-lives when each half-life is 500 million years long.
A 350 kilogram car is traveling at a constant velocity of 15 m/s. What is the net force acting on the car?
Answer:
The net force acting on the car is zero.
Explanation:
From the question given above, the following data were obtained:
Mass (m) = 350 Kg
Velocity (v) = constant = 15 m/s
Net Force (F) =?
An object moving with a constant velocity is not accelerating. The acceleration of such object is zero. Thus, the net force acting on the object is also zero. This can further be explained as shown below:
Mass (m) = 350 Kg
Acceleration = 0 (since the velocity is constant)
Net Force (F) =?
Force (F) = mass (m) × Acceleration (a)
F = m × a
F = 350 × 0
F = 0
Thus, the net force acting on the car is zero.
how do icebergs form
Answer:
They break off large ice sheets found at the North and South poles.
Answer:
The answer is D
Explanation:
They break off large ice sheets found at the poles.
Which situation results in the most attraction between two magnets?
A. The north pole of one magnet is near the south pole of the other
magnet
B. The north pole of one magnet is far away from the north pole of
the other magnet.
C. The north pole of one magnet is far away from the south pole of
the other magnet.
D. The south pole of one magnet is near the south pole of the other
magnet
3kg ball traveling at 10 m/s east collides with 5 kg ball traveling at 2m/s east after the collision the balls stick together what is the final velocity of the 3kg ball ?
Answer:
Explanation:
The formula for this is designed around the fact that momentum must be conserved:
[tex][(m_{ball1}*v_{ball1})+(m_{ball2}*v_{ball2})]_b=[(m_{ball1}+m_{ball2})v_{both}]_a[/tex]
This is because they sitck together after they collide. Filling in:
[(3*10)+(5*2)] = [3 + 5]v and
30 + 10 = 8v so
40 = 8v and
v = 5
They are both moving east at a velocity of 5 m/s since they stuck together.
Based on the data, which prediction should he expect to occur? A2 repels B1. C2 attracts B2. B1 repels C1. A1 attracts C2.
Answer:
its not B1 or A1. must be A2 or C2
Explanation:
Do only number 3 and thank
Charge = 0.2 Ah is the correct answer...
Describe how a wind turbine generates energy.