Answer:
Forces have magnitude and direction.
Explanation:
Force is a vector quantity.
A(n) ________ microscope keeps an object in focus when the objective lens is changed.
Parfocal is the term used to describe a microscope that maintains focus when the objective lenses are replaced.
What is the name of the objective lens ?For observing minute features within a specimen sample, a high-powered objective lens, often known as a "high dry" lens, is perfect. You can see a very detailed image of the specimen on your slide thanks to the 400x total magnification that a high-power objective lens and a 10x eyepiece provide.
The four objective lenses on your microscope are for scanning (4x), low (10x), high (40x), and oil immersion (100x).
The first-stage lens used to create a picture from electrons leaving the specimen is referred to as the "objective lens." The objective lens is the most crucial component of the imaging system since the quality of the images is determined by how well it performs (resolution, contrast, etc.,).
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The frequency of new cases of a disorder within a given time period is referred to as:______
Incidence is referred to as the frequency of new cases of a disorder in a given period of time.
What is incidence?The prevalence of an illness over a specific time period can be calculated using the incidence metric, which measures disease prevalence. In light of this, the incidence of a disease is the quantity of newly discovered cases. An illness' incidence rate is calculated by dividing the number of people at risk for the illness by the number of new cases of the illness. Out of 200 women who participated in the study (and who were free of breast cancer at the start of the study period), five would be diagnosed with breast cancer during the course of a year. In this case, the incidence of breast cancer in this cohort would be 0.025. (Or 2,500 per 100,000 study years among women)
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M 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) calculate the percent uncertainty in the distance. (b) calculate the uncertainty in the elapsed time. (c) what is the average speed in meters per second? (d) what is the uncertainty in the average speed?
The answer for sub question A) calculate the percent uncertainty in the distance is 0.059%.
The answer for sub question B) calculate the uncertainty in the elapsed time is 9,012 s
The answer for sub question C) what is the average speed in meters per second is 4.681 m/s
The answer for sub question D) what is the uncertainty in the average speed is 0.0032 m/s
How are the answers calculated?To calculate the percentage of uncertainty of distance we have uncertainty = 25 m and distance = 42.188 km which is 42188 m.
Now [tex]\frac{25}{42188}[/tex] x 100% = 0.059%
To calculate time elapsed, we have the following data:
2hr which is 7200 s, 30 min which is 1800 s and 12 s
Adding these all up, we get 9012 s.
The average speed in m/s is calculated by 42188 m/ 9012 s = 4.681 m/s
The uncertainty in average speed is calculated by 4.681 m/s x [tex]\frac{0.059 + 0.01}{100}[/tex]
= 0.0032 m/s
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The complete question is A marathon runner completes a 42.188 km course in 2 h , 30 min, and 12 s . There is an uncertainty of 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (b) Calculate the uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?
6. Predicting If you added salt instead of sugar
to a pitcher of lemonade, how would this
change the properties of the lemonade?
—NEED HELPP NOWW
also wouldn’t the properties stay the same because every substance has the the same properties and table salt and table sugar are examples of pure substance??
The lifespan of lemonade is significantly extended if salt is used in place of sugar. In other words, it lasts a lot longer than it would typically.
Despite having a similar appearance, salt and sugar taste considerably differently. Chemically, they differ greatly as well. Salt is an ionic compound comprised of sodium and chloride. Contrarily, sugar contains covalent bonds and is made up of carbon, oxygen, and hydrogen. Similar to adding a pinch of the traditional sodium chloride to baked goods like pies or cakes, adding salt to lemonade can help enhance the sweet flavors and lessen any bitterness that may be present.
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Find an equation of the sphere with center s23, 2, 5d and radius 4. what is the intersection of this sphere with the yz-plane? stewart, james. calculus (page 837). cengage learning. kindle edition.
The intersection of the sphere with the yz- plane will be (y -z)² + (z- 5)² =7
A sphere is can be define as , a geometrical object that has a three-dimensional analogue to a two-dimensional circle. In a very simple word, i.e. a sphere is the set of points that are all at the same distance r from a given point in three-dimensional space.
We are given that ,
The center of sphere = (h, k, l) = (-3,2,5)
The radius of sphere = (r) = 4
Then the formula of the equation of sphere with radius r and center (h, k, l) is given as,
(x- h)² +(y - k)² + ( z -l)² = r²
So that putting the value of center of sphere (h, k, l) and radius (r) in above equation then we get,
(x- (-3))² +(y - 2)² + ( z -5)² = 4²
(x +3 )² +( y - 2)² + ( z -5)² = 16
Therefore, we can write the equation of intersection of the sphere with the yz- plane and putting (x = 0) in above equation then,
(0 +3 )² +( y - 2)² + ( z -5)² = 16
( y - 2)² + ( z -5)² = 16 - 9
( y - 2)² + ( z -5)² = 7
The intersection of the sphere with the yz- plane is, (y -z)² + (z- 5)² =7
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what is the magnitude of your total displacement if you have traveled due west with a speed of 23 m/s for 165 s , then due south at 12 m/s for 285 s ?
Answer:
5108.7 m
Explanation:
23 m/s * 165 s = 3795 m
12 m/s * 285 = 3420 m
mag of resultant ( use pythag theorem)
sqrt ( 3795^2 + 3420^2) = 5108.7 m
Two organ pipes, open at one end but closed at the other, are each 1.03 m long. one is now lengthened by 2.00 cm. find the frequency of the beat they produce when playing together in their fundamental
The frequency of the beat they produce when playing together in their fundamental is 82.29 Hz
From the question we are told that:
Initial pipe length L 1 = 1.03 m
Final pipe length L 2 = 1.03 + (2 x 10^-2) = 1.05 m
The frequency of a repeated event is its number of instances per unit of time. It is also sometimes referred to as ordinary frequency to contrast angular frequency with ordinary frequency and temporal frequency to stress the comparison to spatial frequency.
Generally the equation for Frequency f is mathematically given by
F = v/λ
λ = 4 L and V = speed of sound in air = 343 m/s
F = v/4*1/L1 - 1/L2 = 343/4*1/1.03 - 1/1.05
F = 82.29 Hz
Hence, Frequency of the beat produce is 82.29 Hz
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Superman throws a 2400 n boulder at an adversary. what horizontal force must superman apply to the boulder to give it a horizontal acceleration of 15.0 m/s2 ?
The horizontal force Superman must apply to throw the boulder is 3670N.
According to Newton's Second law of motion,
Force F = Mass m * Acceleration a
We know that Weight W = Mass m * Gravity g
Given,
Weight W = 2400 N
Acceleration a = 15 m/[tex]s^{2}[/tex]
Gravitational force g = 9.81 m/[tex]s^{2}[/tex]
W = m * g
Mass m = 2400 / 9.81 = 244.65 kg
Horizontal force F = 244.65 * 15 = 3669.7 N
Newton's Second law of motion states that acceleration of an object depends on force acting on the object and mass of the object.
Therefore the horizontal force Superman must apply to throw the boulder is 3670N.
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Compare collinear points and coplanar points- ar ecollinear points also coplanar?
The collinear points are also known as coplanar but coplanar cannot be collinear all the time.
What is collinear points and coplanar points?The difference between Collinear Points and Coplanar Points is that the former a states that if three or more points lies in a straight line and a line on which the points lie, especially if it is related to a geometric figure such as triangle, is also called an axis while the latter are simply the same as the meaning of the Collinear but lies on the same plane.
Collinear points lie on the same line and Coplanar points also lies in the same plane.
For example, we have a image which has 3 points A, B and C on the plane M. Those points and plane lies on the same line. So, that it can be known as collinear and coplanar.
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A 500 kg pig is moving south and has a momentum of 17.5 kg m/s. At what velocity is it moving?
Answer:
99km
Explanation:
Ernest rutherford was an important early researcher in nuclear physics. In one experiment, he observed that particles with a positive charge deflected when passing through a thin sheet of gold foil. What conclusion did rutherford make in this observation?.
Answer:
Ernest Rutherford observed that particles with a positive charge deflected when passing through a thin sheet of gold foil, concluding that the atom's positive part is small and dense.
Explanation:
The Ernest Rutherford experiment describes planetary model of an atom. According to the model, an atom has a tiny, compact, positively charged centre called a nucleus, where almost all of the mass is concentrated, while light, negatively charged particles called electrons orbit far around it, much like planets orbit the Sun. In his experiment, the observation that a positive charge is deflected through a thin sheet of gold foil led to the conclusion that the deflection some of the positive charge occurs in a small region of the atom. At the same time, the majority passed through the atom (which was also concluded to be empty space).
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The wavelength of green light is about 500 nanometers. what is this length in meters?
By conversion unit, the length in meters of green light wavelength is 5 x 10¯⁷ m.
We need to know about a conversion unit to solve this problem. Meter is the SI unit for length but there are other units which able to determine the length such as nanometer. The conversion unit of nanometer to meter is
1 nm = 10¯⁹ m
From the question above, we know that the wavelength of green is 500 nanometers. in a meter, we can write as
500 nm = 500 x 10¯⁹ m
500 nm = 5 x 10¯⁷ m
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What magnitude charge creates a 3.20 n/cn/c electric field at a point 3.40 mm away?
Magnitude charge creates electric field at a point 3.40m away is 4.11×1⁻⁹C
Electric field - It is defined as electric force per unit charge.
The direction of field is taken to be the direction of the force.
The electric field is outward from a positive charge and in towards negative point charge.
To calculate magnitude charge. Let us take electric field
E = Kq/r²
where
K = electric field constant
q = magnitude of charge
r = distance of separation
E = Kq/r²
Er² = Kq
q = Er²/K -------1.
given values are
E =3.20 n/c
r = 3.40 m
q = 9.0 × 10⁹
using these values in equation 1 we get
q = 3.20N/C * (3.40 m)^2/9.0 × 10⁹
q = 4.11×1⁻⁹C
Magnitude charge that creates electric field at a point 3.40m away is 4.11×1⁻⁹C.
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The 11 participants in an experiment had the following reaction times (in milliseconds). 242,483,483,486,491,494,500,505,506,507,868. identify all values that are outliers.
The participants whose reaction times are outliers are 242 and 868.
The mean/average value of the above values can be calculated by adding up all the values and dividing the result by 11.
Average Value = 242+483+486+491+494+500+505+506+507+868/11
The average/mean value comes out to be 505.
Thus, the reaction times which are far away from the average value of 505 are outliers.
Among the given values 242 and 868 are the only two values that deviate significantly from the average value as compared to other values.
Therefore, the participants whose reaction times are outliers are 242 and 868.
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Deven is describing aerobic exercise to his friend. What is the MOST
accurate statement he can make in his description?
O Aerobic exercise is generally short and intense.
O Aerobic exercise requires very little oxygen.
Aerobic exercise burns fewer calories than anaerobic exercise.
O Aerobic exercise can last continuously for many minutes.
According to the research, the correct option is Aerobic exercise can last continuously for many minutes. It is the statement that correctly he can use to make in his description about aerobic exercise.
What is aerobic exercise?They are those physical activities that aim to burn fat using a high amount of oxygen.
In this sense, these exercises allow to improve the resistance of the person, they are not very intense but are developed in long periods, unlike anaerobic exercises that are more intense and brief.
Therefore, we can conclude that according to the research, the correct option is Aerobic exercise can last continuously for many minutes. It is the statement that correctly he can use to make in his description about aerobic exercise.
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Answer: Aerobic exercise can last continuously for many minutes.
Explanation:
Got it correct
How long does it take a message to travel from earth to a spacecraft at mars at its closest to earth (about 56 million km)?
A message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.
To find the time, the given values are,
Distance = 56 million kilometers.
What is distance?The amount of space or the length between two points or two objects is said to be distance.The length of displacement between two points.Distance can be measured through meters.Distance is a scalar quantity.
Here,
A message needs to be traveled to mars from earth and the distance between Earth and Mars (given) s = 56 million km
Speed of light = 3.00—10^5 km/ sec
As We know Velocity,
Velocity = distance / time
=> time = distance / velocity
Time taken t = 56 million km / 3.00—10^5
= 56 x 10^6 / 3 x 10^5
= 186.666 sec
Time taken t = 3.11 min.
So, the message to travel from earth to a spacecraft at mars as its closest to earth is about 3.11 minutes.
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How many metric tons (1 metricton = 103 kg) of water fell on the city? (1 cm3 of water has a mass of 1 gram = 10-3 kg
180,000 metirc tons of water fell on the city.
StepsSince we need to know if we are referring to the body of water on a city or, for example, only a swimming pool, the region must be pertinent. The former would undoubtedly be far greater.
It is possible to conceptualize the amount of water that falls on the city as having dimensions.
2km x9km x1cm
200 000 cm x 900 000 x 1cm
= 1.8x10^11 cm^3
since 1km =10^3m and 1m =100cm
1 gram equals 10-3 kg.
Rainfall weighs 10^-3 kg per 1 cm^3 of water, or 1 gram.
1.8x10^11 x 10^-3= 1.8x10^8
ie 1.8x10^8kg
1 metric ton = 10^3kg so the weight of rainfall in metric tons is
1.8x10^8 / 10^3 = 1.8x10^5
ie 180,000 metirc tons
180,000 metirc tons of water fell on the city.
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the question you are looking for is
A heavy rainstorm dumps 1.0 cm of rain on a city 2 km wide and 9 km long in a 2 hour period.How many metric tons (1 metric ton = 10^3 kg) of water fell on the city? [ 1 cm^3 of water has a mass of 1 gram = 10^3 kg.]
Find the work done by winding up a hanging cable of length 12 ft and weight density 2 lb/ft. round your answer to two decimal places, if necessary.
The correct answer for the work done by winding up a hanging cable of length 12 ft and weight density 2 lb/ft is 144 ft/lb.
Consider that the entire hanging cable is lifted by 12 feet and there is weight of with weight density 2 pounds per feet .workdone by hanging
W = ∫2x dx from 0 to 12
W =144 ft/lb.
When a force moves something over a distance, work is done. The energy transferred, or work done, can be calculated by multiplying the force by the distance moved in the direction of the force. Work done = force x distance moved in the direction of the force = energy transferred.
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Write a solutions to the problem of finding the largest number out of three numbers
The largest number within three numbers is 42393 .
Solution,
First of all we have to take three numbers such as,
a: 29320 b: 41332 c: 42393
Enter three numbers: a: 29320 b: 41332 c: 42393
42393 is the biggest of all three numbers.
Taking algorithm of the above steps .
Algorithm:
Take the three numbers as input and store them in variables.Check the first number if it is greater than other two.Repeat the step 2 for other two numbers.Print the number which is greater among all and exit.To know more about Algorithm
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At what temperature will 1.30 mole of an ideal gas in a 1.30 l container exert a pressure of 1.05 atm?
The temperature of the ideal gas is 12.76 K.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
n = 1.3 mol
V = 1.30 l = 1.3 x 10¯³ m³
P = 1.05 atm = 1.05 x 1.01 x 10⁵ Pa = 106050 Pa
By substituting the following parameters, we can calculate the temperature
P . V = n . R . T
106050 . 1.3 x 10¯³ = 1.3 . 8.31 . T
T = 137.865 / 10.803
T = 12.76 K
Hence, the temperature of the gas is 12.76 K.
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Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. what is its chemical formula?
The chemical formula of diiodine pentoxide is I2O5.
The chemical compound with the formula I2O5 is known as iodine pentoxide. The only stable iodine oxide is this one, which is the anhydride of iodic acid. It is made by dehydrating iodic acid in a stream of dry air at 200 °C.
2HIO3 = I2O5 + H2O.
At ambient temperature, iodine oxide (I2O5), which is created by dehydrating iodic acid (HIO3), is a white, crystalline solid that is stable up to 300°C (573K). I2O5 is a potent oxidizer. Its structure is described below. Iodine pentoxide is an oxidizing agent that transfers oxygen atoms to substrate. It functions as an oxidizing agent and speeds up the oxidation process by transferring oxygen atoms.
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If the concentration of the product of a reaction goes from 0.55 m to 0.85 m over 6 minutes, what is the average rate of reaction over that time period in mmin?
Answer: 0.05 M/min
Explanation: (0.85 - 0.55)/ 6 mins
Two identical toy race cars drive horizontally of the top of a table from the same initial height, but with different initial velocities. Which one reaches the ground first?
A. The race cars will hit the ground at the same time.
B. Which one hits the ground first depends on the initial height.
C. The race car with the slower launch speed will hit the ground first.
D. The race car with the faster launch speed will hit the ground first.
If two identical toy race cars drive horizontally on the top of a table from the same initial height, but with different initial velocities, then the race cars will hit the ground at the same time, therefore the correct answer is option A.
What is gravity?It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another.
As given in the problem If two identical toy race cars drive horizontally on the top of a table from the same initial height, but with different initial velocities,
The final velocity of the race cars depends only on the height, as the height is the same for both the cars, the race cars will hit the ground at the same time.
Thus, the correct answer is option A.
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Answer: The answer is A
Explanation:
A fluorescent lamp with a 30 in its nomenclature indicates it produces light with a color temperature of ____ k, which would provide good rendition to warm colors.
Answer:
Fluorescent lamp with a 30 in its nomenclature indicates it produces light with a colour temperature of 3000k
Explanation:
A low-pressure mercury vapor gas discharge lamp called a fluorescent lamp or fluorescent tube employs fluorescence to create visible light. Mercury vapor is excited by an electric current in the gas, which generates short-wave UV rays that causes a phosphor coating on the inside of the lamp to glow. For a fluorescent lamp with 30 in to provide good rendition to warm colour, the colour temperature must be at least up to 3000k. The colour of light emitted by a hypothetical opaque, non-reflective substance at a specific temperature expressed in kelvins is known as colour temperature. Regardless of the temperature of other light sources, the colour of their light is classified using the colour temperature scale.
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When graphically adding vectors in two dimensions, each vector
arrow begins at the origin and proceeds in the direction of the vector
for a distance proportional to the magnitude of the vector.
TRUE
FALSE
It is true that when graphically adding vectors in two dimensions, each vector arrow begins at the origin and proceeds in the direction of the vector for a distance proportional to the magnitude of the vector.
An item with both magnitude and direction is referred to as a vector. A vector can be visualised geometrically as a directed line segment, with an arrow pointing in the direction and a length equal to the magnitude of the vector. The vector points in a direction from its tail to its head. The process of adding two or more vectors together to create a vector sum is known as vector addition.To learn more about vectors, visit :
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Which voltage would cause a current of 0.5 ampere in a circuit that has a resistance of 24 ohms? question 3 options:
a. 48 v
b. 6.0 v
c. 24 v
d. 12 v
By Ohm's Law, the voltage across the circuit is D. 12 v.
We need to know about Ohm's Law to solve this problem. Ohm's Law describes the relationship between voltage and current. It can be determined as
V / I = R
where V is voltage, I is current and R is resistance.
From the question above, we know that
I = 0.5 A
R = 24 Ω
By substituting the following parameters, we can calculate the voltage
V / I = R
V = I x R
V = 0.5 x 24
V = 12 volt
Hence, the voltage is 12 volts.
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Which ball takes a greater force to stop: a slow-moving ball or a fast-moving ball of the same mass? explain your reasoning in terms of newton's second law.
The fast-moving ball will require a greater force to stop than the slow-moving ball of the same mass because the fast-moving ball has more acceleration than the slow-moving ball.
Newton's second law of motion states that "the magnitude of the force acting on an object is equal to the mass of that object and and the acceleration with which it moves.
In other words, the rate of acceleration with which a body moves is directly proportional to the force needed to stop it, and inversely proportional to the mass of the body. Thus, the faster an object moves, the greater the force that will be required to stop it.
That is why the fast-moving ball in the question needed a greater force to stop it than the slow-moving ball, even though they are of the same mass.
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Astronauts brought back 500 lb of rock samples from the moon. how many kilograms did they bring back? 1 kg = 2.20 lb
A. 227 kg
B. 498 kg
C. 500 kg
D. 1,100 kg
Answer:
1100 kg
Explanation:
500 lb x 2.20lb (1kg) =1100kg
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What is the highest speed during the motion.
Answer: 20mm/s
Explanation: Maximum displacement in shortest time....
A charged particle decelerates as it moves from location a to location b. if va = 210 v and vb = 120 v, what is the sign of the charged particle?
The particle is positively charged
What determines the movement of charged particles?The potential difference between the 2 point through which the charged particle moves governs the movement of that particle. An electron moves from lower to higher potential which is negatively charged, and a positively charged particle moves from higher to lower potential.
Now, since the particle is moving from a point A having 210 v potential to point B having 120 v potential that is it is moving from higher potential to a lower potential therefore the particle will be a positively charged one.
What is potential difference?When a single charge is transported in an electric field, work is done by the potential difference (also known as electrical potential). There is potential energy stored in this charge that could flow when work is done on it. Voltage is the shortened form of potential difference and it is measured in volts (V). Voltage is the possibility of a single charge flowing. The need to flow increases with voltage.
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