No. Since the people selected were randomly, the responders constituted random sample from the population.
What is voluntary response sample?Voluntary response sample is a sample which is made up of individuals who can volunteer to be included in response sample.
For example, If a radio host asks her listeners to conduct an online survey on her website about peoples opinion of her show. Each individual listener is voluntarily deciding to take part in survey or not.
The major drawback of sampling method is that these individuals who voluntarily respond is likely to have a stronger opinion which can be positive or negative from the rest of the population which eventually makes them an un-representative sample.
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Calculate the density in units of g/ml of a 4.5-g cube with an edge length of 5.5 cm.
The density of a 4.5 g cube with an edge length of 5.5 cm is 0.027 g/mL
The formulas and the procedures we will use are:
v = s³ρ = m/vWhere:
s= edge lengthv= volumeρ= densitym= massInformation about the problem:
s = 5.5 cmm= 4.5 gρ= ?v= ?Calculating the volume of the cube, we get:
v = s³
v = (5.5 cm)³
v = 166.38 cm³
Converting the volume of the cube from cm3 to mL, we get:
1 cm3 is equivalent to 1 mL, so
166.38 cm³ is equivalent to 166.38 mL
Applying the density formula, we get:
ρ = m/v
ρ = 4.5 g/166.38 mL
ρ = 0.027 g/mL
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Fez loves team sports and gets abundant exercise through team activities. When Fez engages in team activities such as running or passing the ball, what is happening to Fez’s muscles?
When Fez engages in team activities such as running or passing the ball, they are maintaining tension with an equal force on all sides.
What does tension mean ?Any physical object that is in contact with another one can apply forces to that object. The pulling force transmitted axially by a string, cable, chain, or other similar object, or by each end of a rod, truss member, or other similar three-dimensional object is referred to as tension. The action-reaction pair of forces acting at each end of said elements can also be referred to as tension.
The force produced when a load is applied at one or more of the ends of a material in a direction away from the material's cross-section is known as the tension force. It's common to describe a tension force as a "pulling" force. To exert a tension force on the material, the load must be applied axially.
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Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths greater than 3 mm. What is the corresponding frequency of radiation of a wavelength of 13. 4 mm?.
The frequency of electromagnetic waves is 22.32 x 10⁹ Hz or 22.32 GHz.
We need to know about electromagnetic waves to solve this problem. Electromagnetic waves can propagate without media. The speed of electromagnetic in vacuum media is equal to the speed of light. Hence, the wavelength and frequency can be determined as
c = λ . f
where c is the speed of light (3 x 10⁸ m/s), λ is wavelength and f is frequency.
From the question above, we know that
λ = 13.44 mm = 0.01344 m
By substituting the given parameter, we can calculate the frequency of microwaves
c = λ . f
f = c / λ
f = 3 x 10⁸ / 0.01344
f = 22.32 x 10⁹ Hz
f = 22.32 GHz
Hence, the frequency of radiowaves is 22.32 x 10⁹ Hz or 22.32 GHz.
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The extension of an elastic object is __________ proportional to the force applied, as long as the limit of proportionality is not exceeded. What word completes the sentence?
Answer:
Directly
Explanation:
The extension of the elastic object is directly proportional to the force applied.
I hope this is the answer you are looking for and I hope this helps!
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. by what factor does the amplitude of a sound wave increase if the sound intensity level goes up by 40.0 db?
If the sound intensity goes up by 40 db, the amplitude of wave as measured gets increases by a factor of 100.
CalculationThe sound level in decibels can be formulates as
[tex]\beta[/tex] = (10dB) log (I/Io)
Here Io = 10⁻¹²W/m² is specified as the reference intensity
If we assume β₁ as initial sound intensity and β₂ as final sound intensity. Therefore, change in sound intensity can be formulated as
β₁-β₂=40 dB
(10dB) log (I2/Io) - (10dB) log (I1/Io) = 40 dB
(10dB) [log (I2/Io) - log (I1/Io)] = 40dB
log( (I2/Io) / (I1/Io) ) = 40/10 dB
log (I2/I1) = 4dB
I2/I1 = 10^4
The intensity of sound is said as directly proportional to the amplitude of wave squared.
Therefore,
I ∝ A²
I1/I2 = (A1/A2)^2
A2/A1 = [tex]\sqrt{I2/I1}[/tex]
A2/A1 = 100
Therefore, the amplitude of wave increases by a factor of 100.
What exactly is sound amplitude?A sound wave’s amplitude measures the height of the wave. When a sound is made, the maximum displacement of the medium’s vibrating particles from their mean position determines the amplitude of the sound wave.
In physics, amplitude refers to the greatest displacement or distance that a point on a vibrating body or wave can move relative to its equilibrium location. It is equivalent to the vibration paths half-length.
What do sound frequency and amplitude mean?The maximum displacement of a sound wave’s constituent particles is its amplitude. The number of vibrations a sound wave makes per second is known as frequency.
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Calculate the height of a cliff if it takes 2. 35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8. 00 m/s.
The height of the cliff is 8.26 m.
Time taken by a rock to reach the ground from the cliff is t.
t = 2.35 seconds
The initial velocity at which rock is thrown straight up is u.
u = 8 m/s
The gravity of the earth is g.
g = 9.8 m/s²
The height of the cliff from where is rock is thrown straight up at the initial velocity of 8 m/s is,
[tex]Height= Initial \: velocity × Time - \frac{1}{2} Gravity \: of \: the \: earth ×( Time) ^{2} [/tex]
[tex]h = 8 \times 2.35 - \frac{1}{2} \times 9.8 \times (2.35) ^{2} [/tex]
h = -8.26 m
Therefore, the height of the cliff is 8.26 m.
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An artificial channel or large pipe for bringing water from a distance is called a(n):________
Answer:
aqueduct- as opposed to an aquifer which is a geological formation
A blimp is approximated by a prolate spheroid 90 m long and 30 m in diameter. estimate the weight of gas within the blimp for (a) helium at 1.1 atm and (b) air at 1.0 atm.'
(a) Let's start by calculating the helium's weight. We'll apply the well-known weight equation:
W helium =m helium ⋅g
where m helium is the mass of the helium and g is the gravity.
=>W helium =ρ helium ⋅V⋅g
putting the values we get
ρ helium =0.183 kg/ m^3
Therefore, W helilum =76.2 kN
(b) The weight of the air will also be determined in the same manner:
W air =ρ air ⋅V⋅g
=> ρ air =1.205 kg/ m^3
Therefore after substituting the values we get,
W air = 501.35 kN
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(choose )
Ramy covered a distance 3080 cm on foot. This distance is equivalent to.........
a) 0.03Km + 80cm
b) 0.3Km +8cm
c) 3Km + 8cm
d) 30Km + 80cm
Answer:
a) 0.03km + 80 cm is the right answer
When the pilot reverses the propeller in a boat moving north, the boat moves with an acceleration directed south. Assume the acceleration of the boat remains constant in magnitude and direction. What happens to the boat?.
When the pilot reverses the propeller in a boat moving north, the boat moves with an acceleration directed south. Assume the acceleration of the boat remains constant in magnitude and direction. The boat will eventually stops and then speeds up in the reverse direction.
As the pilot reverses the propeller in a boat moving north, the boat moves with an acceleration directed south. This is because the propeller is pushing against the water in the opposite direction to the boat's motion. The acceleration of the boat remains constant in magnitude and direction until the boat reaches its maximum speed in the reverse direction. At this point, the boat will eventually stop and then speed up in the reverse direction.
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How does a chef use science.
Answer:by cooking
Explanation: because he use energy and everything like transfer
Triangle has a base that is decreasing at a rate of 11cm/s with the height being held constant. what is the rate of change of the area of the triangle if the height is 7cm?
The rate of change of the area of the triangle if the height is 7cm is 38.5 cm/s
What is Rate of change?
A rate is anything that can be measured over time. Common rates include velocity (which is the rate of distance traveled), power (rate of work being done), etc. All these have one thing in common which is that they are all divided by the amount of time it took to obtain a certain measurement.
Let the base of the triangle be b,
the height of the triangle = h
and the area of the triangle = A
Area of a triangle, A is = bh/2
Rate of change of the area, A is :
dA/dt = d(1/2(bh))/dt = 1/2 (db/dt)h + 1/2(bdh/dt)
At constant height, dh/dt = 0
that is
dA/dt = 1/2(db/dt)h
It is given that :
db/dt = 11 cm/s
h = 7cm
dA/dt = (11x7)/2 = 38.5 cm/s
Therefore, the rate of change of the area of the triangle if the height is 7cm is 38.5 cm/s
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If you place a 4.00 g effervescent antacid pill into 110 ml (110 g ) of water in a 105 g glass, how much will the glass of water weigh once the antacid pill has dissolved?
The glass of water weigh once the antacid pill has dissolved will be less than the 219 grams due to evolution of carbon dioxide.
Evaluating :Mass of effervescent antacid pill = 4.00 g
Mass of water = 110 g
Mass of glass = 105 g
Total mass of the substances together : 4.00 g + 110 g + 105 g = 219 g
Effervescent antacid pill , moment it will get dissolved in water carbon dioxide gas is evolves and hide from the solutions.
This states that mass of the weight of the glass of water with antacid dissolved in it will be less than 219 grams.
What happens once you put antacid tablets in water?
Effervescent antacid tablets are made up of aspirin, acid and sodium bicarbonate. When bicarbonate of soda dissolves in water, it reacts with hydrogen ions from the acid and forms carbon dioxide. Because CO₂ is a gas, it forms bubbles inside the water that you simply can see as foam on the surface
Is antacid an acid or base?Antacids are weak bases that act by neutralizing gastric acid . Raising the pH of the stomach contents leads to suppression of the action of pepsin that exacerbates ulceration due to acid.
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What is the change in the electrical potential energy in a lightning bolt
if 35 C of charge travels to the ground from a cloud 2.0 km above the
ground in the direction of the field? Assume the electric field is uniform
and has a magnitude of 1.0 × 10° N/C.
Explanation:
Given Data,
Amount of charge transferred to the ground by the lightening bolt, q = 35 C
Amount of charge transferred to the ground by the lightening bolt, q = 35 C
Amount of charge transferred to the ground by the lightening bolt, q = 35 C Distance between the cloud and the ground, d
Amount of charge transferred to the ground by the lightening bolt, q = 35 C Distance between the cloud and the ground, d = 2.0 km = 2000 m
Amount of charge transferred to the ground by the lightening bolt, q = 35 C Distance between the cloud and the ground, d = 2.0 km = 2000 m
Amount of charge transferred to the ground by the lightening bolt, q = 35 C Distance between the cloud and the ground, d = 2.0 km = 2000 m Magnitude of electric field, E = 1.0 × 10⁶ N/C
Now, finding PE(∆U) in lightning bolt,
ΔU = -q×E×dΔU = −35
C × 1.0 × 10⁶
N/C × 2000 m
ΔU = −7.0×10¹⁰ J
A force F has components Fx = 100 Newtons, and Fy= 153.2 Newtons. Express F in terms of unit
vectors and find its magnitude and angle
The magnitude of the unit vector of the forces is 182.92 N and the direction is 56.87⁰.
What is a unit vector?A unit vector is a type of quantity that has both magnitude and direction.
A unit vector can also be described as a single vector that can represent two vectors in terms of magnitude and direction.
What is resultant vector?A resultant vector is defined as a single vector that produces the same effect as is produced by a number of vectors collectively.
The unit vector of the two forces is calculated as follows;
R² = Fx² + Fy²
where;
Fx is the force in horizontal directionFy is the force in vertical directionR is the resultant vectorR = √( Fx² + Fy²)
R = √( 100² + 153.2²)
R = 182.95 N
What is the direction of the vector?The direction of the vector is calculated as follows;
θ = arc tan (Fy/Fx)
θ = arc tan (153.2 / 100)
θ = 56.87⁰
Thus, the magnitude of the unit vector of the forces is 182.92 N and the direction is 56.87⁰.
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The shaded region in the diagram below is a region of uniform electric field that is parallel to the horizontal direction (x-axis). A charge
Q = −4.9 µC
moves through this region as shown by the green arrow.
(b) The work done by the electric field as the charge moves from location A to location B is +2.30 10-3 J. What is the potential difference
VB − VA?
(A) The direction of electric field in given region is to the left.
(B) The potential difference is -0.46×[tex]10^{3}[/tex].
(A) When charge is present in any form, a point in space has an electric field that is connected to it. The value of E, often known as the electric field strength, electric field intensity, expresses the strength and direction of the electric field.
Therefore, the direction of electric field in given region is to the left.
(B) The amount of work required to move a unit charge from one point to another point is equal to the potential difference between two points in an electric circuit.
[tex]V_{B} -V_{A}[/tex] = W / Q
[tex]V_{B} -V_{A}[/tex] = 2.30×[tex]10^{-3}[/tex] / -4.9×[tex]10^{-6}[/tex]
[tex]V_{B} -V_{A}[/tex] = -0.46×[tex]10^{3}[/tex]
Therefore, the potential difference is -0.46×[tex]10^{3}[/tex].
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An atom emitted green color during flame test which is about 550 nm. what is the frequency of this light? .545 x10-15/s 3.5 x 10-8/s 5.5x 10-7/s 5.45x 1014/s
During the flame test, an atom emitting a green color with a wavelength of roughly 550 nm would have a frequency of 5.45 1014 Hertz.
What is wavelength?It may be explained in terms of the separation between any two identical succeeding locations on a wave, such as how the wavelength can be determined by calculating the separation between any two successive crests.
Speed of light = frequency of the green light ×wavelength of the light
3×10⁸ = 550×10⁻⁹ × frequency
frequency = 3×10⁸ / 550×10⁻⁹
= 5.45 ×10¹⁴ Hertz
Thus, the correct answer is option D.
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You start from rest and ski down a hill with an acceleration of 2 m/sec2. Find your speed
at the following times:
a. 2 seconds
b. 10 seconds
a. Your speed after 2 seconds is 4 m/s.
b. your speed after 10 seconds is 20 m/s.
a. How to find your speed after 2 secondsTo find the speed after 2 seconds, we use the equation of motion v = u + at where
v = speed after 2 seconds, u = initial speed, a = acceleration and t = timeGiven that You start from rest and ski down a hill with an acceleration of 2 m/sec².
u = 0 m/s (since you start from rest)a = 2 m/s² andt = 2 sSo, substituting the values of the variables into the equation for the speed, v, we have
v = u + at
v = 0 m/s + 2 m/s² × 2 s
v = 0 m/s + 4 m/s
v = 4 m/s
So, your speed after 2 seconds is 4 m/s.
b. How to find your speed after 10 secondsTo find the speed after 10 seconds, we use the equation of motion v = u + at where
v = speed after 10 seconds, u = initial speed, a = acceleration and t = timeGiven that You start from rest and ski down a hill with an acceleration of 2 m/sec².
u = 0 m/s (since you start from rest)a = 2 m/s² andt = 10 sSo, substituting the values of the variables into the equation for the speed, v, we have
v = u + at
v = 0 m/s + 2 m/s² × 10 s
v = 0 m/s + 20 m/s
v = 20 m/s
So, your speed after 10 seconds is 20 m/s.
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n order to maintain good sleep hygiene, it is best to reserve your bed for sleeping and to engage in all other activities in other parts of your house.
How does the amount of potential energy change if a hill is taller.
5km straight north then 5km straight west
what is the total displacment
The total displacement of the person will be 15 km.
If a person moves 5 km towards north and then 5 km towards west, so what will be the total displacement?
If we move in a straight path means that moves towards 5 km north and then a person moves towards the 5 km west, so the total displacement of the person will be 15 km and the reason behind this is given below;
For example a car moves towards the north 5km and then directly he want to go towards the 5km west, so the total displacement will be 15 km because the car first moves towards the north so he covered 5 km and then the car directly goes towards the west 5 km, so for coming this he will again come to his initial stage and then the car will go towards the west and covers 5 km. So therefore the total displacement will be 15 km.
So we can conclude that the total displacement of the person will be 15 km.
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A force of 200.0 n is exerted on a 1,000 n object. the object moves a distance of 30.0 m. how much work was done on the car?
When a force of 200.0 n is exerted on a 1,000 n object. The object moves a distance of 30.0 m. 24,000J work was done on the car.
Work=Force × Distance is a formula that describes the relationship between work, force, and distance. While distance is expressed in meters, force is expressed in Newtons (N). The result is Joule.
So, total force is 1000-200 = 800N
Work=Force × Distance
Work=800 × 30
Work=24,000J
So, when a force of 200.0 n is exerted on a 1,000 n object. The object moves a distance of 30.0 m. 24,000J work was done on the car.
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You drive a car 1500 ft to the east, then 2500 ft to the north. if the trip took 3.0 minutes, what were the direction and magnitude of your average velocity?
The velocity of the car was 4.93m/s and the direction was northeast.
CalculationIt is given,
time of the trip = t = 3 minutes = 180 seconds
1st distance A = 1500ft = 457.2m east
2nd distance B = 2500ft = 762m north
We are asked to find the average velocity.
First, we get the resultant distance magnitude by applying Pythagoras theorem to find the hypotenuse.
[tex]A^{2} + B^{2} =C^{2} \\C=\sqrt[]{A^{2} +B^{2} } \\C=\sqrt{457.2^{2} +762^{2} } \\C= 888.63m[/tex]
Then we have
Velocity = Distance/time
Velocity = 888.63/180
Velocity = 4.93 m/s
Then the direction is northeast.
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Gay-lussac's law assumes that __________.
a) the temperature is held constant
b) the volume is held constant
c) the number of moles is held constant
Gay-lussac's law assumes that the volume is held constant and the number of moles is held constant.
What is Gay-lussac's law?Gay-Lussac's law states that : The pressure and the temperature of an ideal gas are directly proportional, held mass and volume remains constant.
When the volume is kept as constant, the pressure of a gas will be directly proportional to its temperature.
The law is named after the French physicist and chemist Joseph Gay-Lussac. In 1802, Gay-Lussac formulated this law. It was a formal statement which shows the relationship between temperature and pressure which was described by French physicist, Guillaume Amonton in late 1600’s.
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Indicate how many of each type of molecular orbital exist in acetone. for each type of molecular orbital, enter an integer (0, 1, 2, etc.) with no decimal places.
There are 10 bonding orbitals
10 antibonding orbitals
2 nonbonding orbitals
Each of the lone pairs on the oxygen is contained in a nonbonding molecular orbital.
What kinds of molecular orbitals does acetone contain?In acetone, there are ten antibonding orbitals.
What percentage of molecular orbitals have a N value of two?
The two 2s orbitals and all three 2p orbitals are the atomic orbitals with a n value of 2.
Eight molecular orbitals, of which half are bonding and the other half are antibonding, are created when these four orbitals from one atom interact with these four orbitals from another atom.
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The area of each plate of an air filled parallel plate capacitor is 0.8 m2 , and the spacing between the plates is 1.1e-006 m. what is its capacitance?
The capacitance of capacitor is 6.44 μF.
We need to know about the capacitance of the air-filled capacitor to solve this problem. The capacitance of the air-filled capacitor depends on the charge and voltage. It can be written as
C = Q/V
where C is capacitance, Q is charge and V is voltage.
Capacitance also can be calculated by the area and distance between the capacitor plate
C = εo . A / d
where εo is vacuum permittivity (8.85 x 10¯¹² F/m), A is the area of the plate and d is distance.
From the question above, we know that
A = 0.8 m²
d = 1.1 x 10¯⁶ m
By substituting the given parameters, we can calculate the capacitance
C = εo . A / d
C = 8.85 x 10¯¹² . 0.8 / 1.1 x 10¯⁶
C = 6.44 x 10¯⁶ F
C = 6.44 μF
Hence, the capacitance of capacitor is 6.44 μF.
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Acceleration due to gravity on Mars is -3.7 m/s2. If you throw a Martian rock upwards with a velocity of 21.1 m/s, how long will it take to land back in your hand, at the same height from which it was thrown?
Answer:
5.7 seconds
Explanation:
1. We know that :
acceleration = change in velocity / time
2. We have been given the following :
acceleration = - 3.7 m/s^2
initial velocity = 21.1 m/s
final velocity = 0 (at the rock's max greatest height its velocity is 0)
time = ?
3. Subsitute the values + rearrange for t :
-3.7 = 0 - 21.1/t
t = 0-21.1/-3.7
t = -21.1/-3.7
t = 5.7 seconds (1.d.p)
If the mirror is immersed in water (refractive index 1.33), what is its focal length?1`
The refractive index of the mirror immersed in the water is 1.33. There is no change in its focal length. The focal length of mirrors will not depend on the external medium in which the mirror is immersed.
What is focal length?Focal length is defined as the distance of the pole of the mirror from the point on the axis of the mirror at which the beams, parallel to the principle axis, show up to merge. In other words, the distance between the pole of the mirror and the centre point is called the focal length
A concave mirror converges all the rays of light falling on this, so it is called converging mirror
A convex mirror diverges all the rays of light falling on this, so it is called diverging mirror
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Find the distance traveled in 27 seconds by an object traveling at a constant velocity of 15 feet per second.
The distance d travelled by in object is 68.58 m
What is velocity ?
velocity is defined as rate of change of displacement d of the object with respect to rate of change in time t. In mathematics It is written as :
v = d/t
it should be noted that, velocity is nothing but speed in particular direction. That is velocity is vector quality having both magnitude and direction where as speed is just the magnitude of velocity.
1 feet = 0.3048 m
15 feet = 4.572 m
Now, calculating the distance d travelled by in object :
d = vt
d = 4.572 x 27
d = 68.58 m
Therefore, the distance d travelled by in object is 68.58 m
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What is the total distance travelled by an object travelling at an average speed of
0.0470 km/h for 2 min 33 s?
Total distance traveled by an object traveling at an average speed of
0.0470 km/h for 2min 33s is 1.99 m.
Distance is defined as an object's entire movement without regard for direction. Distance may be defined as how much ground an item has traversed regardless of its starting or finishing place.
The following equation can be used to determine the distance traveled by an object traveling at an average speed:
distance traveled = average speed * time
When is this:
Meters are used to measure distance traveled (m)Meters per second (m/s) is a unit of measure for average speed.Seconds are used to measure time (s)Given,
average speed = 0.0470 km/h
converting average speed from km/h to m/s
= 0.01305556 m/s
time = 2min 33s
converting time in seconds
= 153s
thus, we know that
distance traveled = average speed * time
= 0.01305556 * 153
= 1.99 m
Therefore, the Total distance traveled by the object is 1.99m.
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