Answer:
B
Explanation:
B makes the most sense in my opinion. because different discoveries have influenced many factors of the world
Answer: B.
Explanation:
A scientific discovery that has changed the world is Edward Jenner’s vaccine against the smallpox. His vaccine has been further modified to combat other diseases.
pls hit the thx button and mark me brainliest if this helped :)
what is the rate of vibration measured in
Answer:
I'm not 100% sure tbh but the only thing I think makes sense to represent vibration would be frequency which is measure in Hertz (Hz)
Explanation:
PLEASE HELP ME SOLVE THIS!! PLZ
Banpo Bridge fountain is 60 metres above the water.
The water is projected with a horizontal speed of 6m/s
-Calculate:
1. The time taken to hit the river for a single droplet of water.
2. The range of the projectile for a single droplet of water.
3. The velocity (diagonal) when it hits the water.
Answer:
1.) Time = 3.5 seconds
2.) Range = 21 m
3.) Velocity = 34.8 m/s
Explanation:
Given that the
Height h = 60 m
Initial velocity U = 6 m/s
1.) The time taken to hit the river for a single droplet of water can be achieved by using second equation of motion
h = Ut + 1/2gt^2
Let assume that the water drops from rest. Therefore, U = 0
60 = 1/2 × 9.8t^2
60 = 4.9t^2
t^2 = 60/4.9
t^2 = 12.24
t = sqrt (12.24)
t = 3.5s
2.) The range of the projectile for a single droplet of water will be calculated by using the formula
R = Ut
Range R = 6 × 3.5 = 20.99
Range = 21 m
3.) The velocity (diagonal) when it hits the water.
Using third equation of motion
V^2 = U^2 + 2gH
Substitute values into the equation
V^2 = 6^2 + 2 × 9.8 × 60
V^2 = 36 + 1176
V^2 = 1212
V = sqrt (1212)
V = 34.8 m/s
Which of the following statements cannot be supported by Kepler's laws of planetary motion? a. The distance of a planet around the sun changes throughout its orbit. b. The speed a planet is moving around the sun changes throughout the year. c. The orbital period of Mercury can be calculated using the orbital period of Jupiter and the average distances of both planets. d. The age of the four largest planets can be determined using the age of the four smallest planets and the average distances of each planet.
Answer:
Kepler studied the periods of the planets and their distance from the Sun, and proved the following mathematical relationship, which is Kepler's Third Law: The square of the period of a planet's orbit (P) is directly proportional to the cube of the semimajor axis (a) of its elliptical path.
Explanation:
Answer:
D
Explanation:
Just got a 100 on the test
The ___ ear is the part of the ear that collects the sound.
a.) Inner
b.) Middle
c.) Outer
Answer:inner
Explanation:
Because that where our ear drum listen to any kind of noise
Answer:
inner
Explanation:
that's where the ear drum is and that's where the sound all come in
Explain the function of earth wire. Why is it necessary to earth metallic appliances?
Answer:
to prevent any electric shock to the user. (more info below)
Explanation:
The metallic structure of electrical equipment is bound to the earth by means of earth wire, such that any electrical current leakage is transmitted to the field. This stops the consumer from experiencing any electrical shocks. That's why the electrical devices ought to be earthed.
hope this helled!
The Washington Monument is 169.20 meters tall.
A worker assigned to the restoration of the Washington Monument is checking the condition of the stone at the very top of the monument. A nickel with a mass of 0.005 kg is in her shirt pocket. What is the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument?
Answer: K.E = 8.3 J
Explanation:
The given parameters are
Height h = 169.2 m
Mass m = 0.005kg
From conservation of energy, at the top of the monument, the total energy will be kinetic energy which is equal to the potential energy. That is,
K.E = P.E
And
P.E = mgh
Where g = 9.81 m/s^2
Substitutes all the parameters into the formula
P.E = 0.005 × 9.81 × 169.2
P.E = 8.2908 J
Therefore, the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument is approximately 8.3 Joule.
The kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument is 8.2908 Joules.
Given the following data:
Mass of nickel = 0.005 kgHeight of Washington Monument = 169.20 metersScientific data:
Acceleration due to gravity = 9.8 [tex]m/s^2[/tex]To calculate the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument, we would apply the law of conservation of energy.
The law of conservation of energy.According to the law of conservation of energy, the kinetic energy (KE) of the nickel is equal to the potential energy (PE) possessed by the nickel at the top of the monument.
Mathematically, this is given by this expression:
[tex]K.E =P.E =mgh[/tex]
Substituting the given parameters into the formula, we have;
[tex]K.E = 0.005 \times 9.8 \times 169.20[/tex]
K.E = 8.2908 Joules.
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Which part of an investigation is only found in an experimental investigation?
O a hypothesis
a control group
a procedure
a conclusion
Answer:
Explanation:
a control group
An electromagnet is a ____________ with a _________core.
Answer:
Solenoid with a Metal core
Which of the following are features of the nucleus of an atom?
All of the following are stress management techniques EXCEPT:
A.
Eliminate or reduce the stressor.
B.
Use relaxation techniques.
C.
Ignore the stress you feel.
D.
Alter your perception of the stressor.
Ignoring the stress we feel is not a possible thing as long as it persist. We must identify the source that creates stress and try to eliminate or reduce its effect through relaxation techniques.
What is stress management ?There isn't a one-size-fits-all approach to managing stress. Your stress-reduction routine will be very different from someone else's depending on the kind and frequency of your stress. However, it's useful to have a toolkit of stress-reduction methods on hand in case you require them.
It's common to have difficult circumstances in life. The daily commute and paying taxes are only two examples of daily pressures. It has an impact on everyone. The key is to learn how to control it so that our stress levels don't become too high.
There are many relaxation techniques to get rid of stresses such as yoga, community work out, music therapy. etc. Be active and control yourselves always and proper food and positive talks make everything out of stress.
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HELP HELP HELP HELP HELP HELP!!!!!!
Barry is 62 years old. He runs every single day. His BMI is 15. He would like to gain weight, and increase muscle in his upper body, chest, and back.
what exercise should he do?
Answer:
.He shouldn't eat:
1.Sugar
2.Fast food
3.Fat
Exercise:
1.Heel touches while lying on the ground
2.Abdominal crunches
3.V ups
3.Planks
How do these frogs vary from each other ? Give a reason to support your answer.
Answer:
frogs have lungs to breath on land and gills to breath underwater that makes a frog different from each other
Calculate the frequency if the time between two wave crests is 5
seconds?
Answer:
Wave frequency can be measured by counting the number of crests or compressions that pass the point in 1 second or other time period. The higher the number is, the greater is the frequency of the wave.
hope this helps u
Answer:
0.2 Hz
Explanation:
Which of the following can be studied by science?
O A. The mass of a dwarf planet
OB. The popularity of a new video game
O C. The name of a hurricane
O D. The beauty of the Grand Canyon
What was the key element that caused Venus and Earth to have different environments?
a.) the way carbon is stored
b.) the presence of humans
c.) water and the oceans
d.) how close they are to the sun
Option D because the temperatures there are like 800 degrees Fahrenheit which means it is enough o melt lead so that's the key element that caused Venus and earth to have different environments because energy is key to life.
what is the period of Earth spinning on its axis? what is its frequency?
Period = 24 hours per spin.
That's 86,400 seconds.
Frequency = 1 spin / 24 hours.
That's 1 spin / 86,400 seconds.
Frequency = 0.00001157 Hz
Explain how mirrors can produce images that are larger or smaller than life size, as well as upright or inverted
Answer:
1) When [tex]d_{o}[/tex] < [tex]d_{i}[/tex] (hence [tex]d_{o}[/tex] < f ) and they are both in front of the mirror (positive), the image will be larger and inverted
2) When [tex]d_{o}[/tex] > [tex]d_{i}[/tex] (and [tex]d_{o}[/tex] < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted
3) When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror
Explanation:
The position of an object in front of a concave mirror of radius of curvature, R, determines the size and orientation of the image of the object as illustrated in the mirror equation
[tex]\dfrac{1}{f}=\dfrac{1}{d_{o}} + \dfrac{1}{d_{i}}[/tex]
[tex]Magnification, \, m = \dfrac{h_{i}}{h_{o}} = -\dfrac{d_{i}}{d_{o}}[/tex]
Where:
f = Focal length of the mirror = R/2
[tex]d_{i}[/tex] = Image distance from the mirror
[tex]d_{o}[/tex] = Object distance from the mirror
[tex]h_{i}[/tex] = Image height
[tex]h_{o}[/tex] = Object height
[tex]d_{o}[/tex] is positive for an object placed in front of the mirror and negative for an object placed behind the mirror
[tex]d_{i}[/tex] is positive for an image formed in front of the mirror and negative for an image formed behind the mirror
m is positive when the orientation of the image and the object is the same
m is negative when the orientation of the image and the object is inverted
f and R are positive in the situation where the center of curvature is located in front of the mirror (concave mirrors) and f and R are negative in the situation where the center of curvature is located behind the mirror (convex mirrors)
∴ When [tex]d_{o}[/tex] < [tex]d_{i}[/tex] (hence [tex]d_{o}[/tex] < f ) and they are both in front of the mirror (positive), the image will be larger and inverted
When [tex]d_{o}[/tex] > [tex]d_{i}[/tex] (and [tex]d_{o}[/tex] < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted
When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror.
A circuit has a voltage drop of 60.0 V across an 80.0 resistor that carries a current of 0.750 A. What is the power used by the resistor? Use P = VI. A. 60.0 W B. 45.0 W C. 4800.0 W D. 2.00 W
45.0 W is the answer
WILL MARK BRAINLIEST
Using the fact that pressure is defined as force : area, what is the pressure
exerted by 1 book in N/m??
Answer:
Pressure= force/ area
12/ 2033.33= 24400 N/m2.
i believe this is it :)
A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car? PLS HELP
Answer: V = 15 m/s
Explanation:
As stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. The observed frequency the car will be experiencing will be addition of the two frequency. That is,
F = 2.1 × 10^10 + 1030 = 2.100000103×10^10Hz
Using doppler effect formula
F = C/ ( C - V) × f
Where
F = observed frequency
f = source frequency
C = speed of light = 3×10^8
V = speed of the car
Substitute all the parameters into the formula
2.100000103×10^10 = 3×10^8/(3×10^8 -V) × 2.1×10^10
2.100000103×10^10/2.1×10^10 = 3×108/(3×10^8 - V)
1.000000049 = 3×10^8/(3×10^8 - V)
Cross multiply
300000014.7 - 1.000000049V = 3×10^8
Collect the like terms
1.000000049V = 14.71429
Make V the subject of formula
V = 14.71429/1.000000049
V = 14.7 m/s
The speed of the car is 15 m/s approximately
Answer: 7.36m/s
Explanation:
(Fo- f)/fo = 2v/c
1030/2.10 x 10^10 = 2v/ 3 x 10^10
4.905= 2v/3 x 10^10
Rearrange for v
V = ((1030/2.10 x 10^10) x (3x 10^10)) / 2
V = 7.36 ( right for acellus)
The frequency of purple light is ____ that of yellow light. higher than lower than the same as faster than
Answer:
Faster
Explanation:
Purple light's frequency is faster than yellow
The frequency of purple light is higher that of yellow light.
What is color?The electromagnetic spectrum is the basis for the visual sense of colour. Color perception is connected to an object's light absorption, reflection, emission spectra, and interference, even though color is not an inherent property of matter.
The majority of humans use three different types of cone cells to see color in the visible light spectrum (trichromacy). Other species may have a distinct range of color sensitivity because they have a different number of cone cell types or eyes that are sensitive to a different wavelength, such as bees that can discern ultraviolet.
Different light wavelengths or spectral sensitivity in various cone cell types serve as the basis for animal perception of color, which is then processed by the brain.
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PLEASE HELP 50 pts + brainliest. 3. A laser light travels from air (n=1) through water (n=1.33), and then a piece of glass (n=1.55). The light first enters the water at an angle of 25.0 degrees (from air to water). Draw a diagram. Use Snell’s Law to find the angle of refraction in the water and then in the glass. I don't know how to do this.
Answer: the angle of refraction in the water is 34.2 degrees and then in the glass is 41 degrees approximately
Explanation:
A laser light travels from air (n=1) through water (n=1.33), and then a piece of glass (n=1.55).
If the light first enters the water at an angle of 25.0 degrees (from air to water). That means
The incident angle = 25 degrees
Using Snell' law
n(air)/n(water) = sin 25/sin R
Where R is the angle of refraction
1/1.33 = sin 25/sin R
Make sin R the subject of formula
Sin R = sin 25 / 0.7518
Sin R = 0.5620
R = sin^-1(0.5620)
R = 34.2 degrees
This angle will be an incident angle when the light is travelling from the water to glass. Using Snell law agains,
1.33/1.55 = sin 34.2/sin R
Cross multiply
1.33 sin R = 0.87122
Make R the subject of formula
Sin R = 0.87122/1.33
Sin R = 0.6550
R = sin^-1(0.6550)
R = 40.9 degrees
Therefore, the angle of refraction in the water is 34.2 degrees and then in the glass is 41 degrees approximately.
Find the attached file for the figure
Which of the following statements about the negative influence of stress is TRUE?
A.
Stress can raise your blood pressure.
B.
Stress puts your body in a state of exhaustion.
C.
Stress weakens your immune system.
D.
All of the above.
Answer:
Its D
Explanation:
WILL GIVE BRAINIEST TO CORRECT
Calculate the frequency of a wave that is traveling at a speed of 3.0 m/s and has a wavelength of 1.2 m.
Frequency = speed / wavelength
Frequency = (3 m/s) / (1.2 m)
Frequency = 2.5 /s
That's 2.5 Hz.
a spring has a constant of 20 n/m. how far will it extend when the following forces are applied. (assume the spring does not pass its elastic limit)
a) 10 N
b) 50 N
c) 0.2 KN
Answer:
A.) 0.5 m
B.) 2.5 m
C.) 10 m
Explanation:
Given that the
Spring constant K = 20 N/m
From hooks law
F = Ke
Where
F = force applied
K = spring constant
e = extension
A.) When F = 10 N
Substitute F and K into the formula
10 = 20e
e = 10/20 = 0.5 m
B.) When F = 50 N
50 = 20e
e = 50/20 = 2.5 m
C.) When F = 0.2 KN
0.2 × 1000 = 20e
200 = 20e
e = 200/20 = 10m
Please answer as soon as possible.
A Physics question about electricity and circuits.
Answer:
Explanation:
The formula P=VI, just rearrange to find I
So
I=P/V
=75/120
=0.625amps
625mA
A measure of how consistently a result is determined by repeated evaluations
is called
A. qualitative.
B. quantitative
C. precision
D. accuracy.
SUBMIT
Answer: C
Precision
Explanation:
When a quantity is measured two or more different times, and the results are very close to each other, this indeed indicates how precise the value is. That is how exact and accurate it is.
Therefore, a measure of how consistently a result is determined by repeated evaluations is called precision
What type of radiation exposure of 100,000 mrem can cause radiation sickness or increase the risk of cancer?
Long term exposure
Short term exposure
Both long and short term exposure
What are the answers please help
Answer:
a.) The main scale reading is 10.2cm
b.) Division 7 = 0.07
c.) 10.27 cm
d.) 10.31 cm
e.) 10.24 cm
Explanation:
The figure depicts a vernier caliper readings
a.) The main scale reading is 10.2 cm
The reading before the vernier scale
b.) Division 7 = 0.07
the point where the main scale and vernier scale meet
c.) The observed readings is
10.2 + 0.07 = 10.27 cm
d.) If the instrument has a positive zero error of 4 division
correct reading = 10.27 + 0.04 = 10.31cm
e.) If the instrument has a negative zero error of 3 division
correct reading = 10.27 - 0.03 = 10.24cm
A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car?
Answer :
316 Hz
Explanation:
Answer: 7.36
Explanation:
