Answer:
Option C
Explanation:
Scalar quantities are described by its magnitude only. They do not need to be described by the direction. So, 20 miles per hour is the scalar quantity.
Answer:
The answer is C
Explanation:
Scalar is a quantity that has only magnitude with no directions.
In the options above, option A, B and D show the directions which is Vector quantity.
QUESTION 35
How is it possible for a stuntman to drop from a two-story building onto a mattress and not be injured?
A. The mattress increases the impact.
OB. The mattress decreases the time of the impact
C. The mattress decreases the man's force.
D. The mattress increases the time of the impact
Answer:
C. The mattress decreases the man's force.
Explanation:
Has to be c
Answer:
C. becuase this would make the man survive.
At which point does the planet have the least gravitational force acting on it?
Answer:
At which point does the planet have the least gravitational force acting on it?
Explanation:
In an elliptical orbit, when a planet is at its furthest point from the Sun, it is under the least amount of gravity, meaning that the force of gravity is strongest when it is closest.
Answer:
Point A
Explanation:
Recall that gravitational force is inversely proportional to the square of the distance between the 2 objects.
This means that the farther away the objects are from each other, the lesser their gravitational interaction will be.
In this case we can see that Point A is furthest away from the star, hence this will be the location with the least gravitational force from the star.
14. Which of the following ray diagrams is correct for the mirror shown?
Answer:
C is the correct answer
Answer:
B
Explanation:
Throwing a football is an example of what type of motion ?
a) two-dimensional
b) one-dimensional
c) displacement
d) distance
A scientist wants to measure the relationship between humidity in the
summer and the number of home runs in baseball. Which of the following is a
testable question about this topic?
A. Are home runs more fun to watch than normal hits?
B. Are home runs more exciting during the summer?
C. Are there more home runs during the more humid months of the
summer?
D. Should fans like the players who hit the most home runs?
Answer:
i think option c is correct answer.
"Fun", "exciting", and "like" cannot be scientifically tested. They're perceived differently by different people, and they may even be perceived differently by the same person on different days.
Option-C is the only testable question on this list.
Compare and contrast electromagnetic force, electromagnetic waves, and an electromagnetic field
Electromagnetic fields are a combination of invisible electric and magnetic fields of force.
Electromagnetic waves is a way or path to represent electromagnetic field
When conductor comes in an Electromagnetic field the electromagnetic waves exerts a force on it called electromagnetic force
What are electromagnetic waves?Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
Electromagnetic fields are a combination of invisible electric and magnetic fields of force.
Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. It is a way or path to represent electromagnetic field
When a conductor is placed in a magnetic field and current flows in the conductor, the magnetic field and the current interact each other to produce force. The force is called "Electromagnetic force". When conductor comes in an Electromagnetic field the electromagnetic waves exerts a force on it called electromagnetic force
learn more about electromagnetic waves
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How is a voltmeter used in a circuit?
A. It is connected in series and measures current.
B. It is connected in parallel and measures potential difference.
C. It is connected in parallel and measures current.
D. It is connected in series and measures potential difference.
Answer:
Explanation:
A voltmeter is usually connected in parallel with a part of a complete circuit. The meter itself is connected in series to a very high resistance so that the amount of current drained is very tiny.
So you see, you could answer this in two ways, but since you are asking a question at a very beginning level, I think the answer should be
B
because voltmeters are made to measure potential difference and they are placed in parallel to the part measured. How it works is interesting but is not really part of the question.
Answer:
B. It is connected in parallel and measures potential difference.
Explanation:
A voltmeter is connected in parallel.
A voltmeter is used for measuring the electrical potential difference between two points in an electric circuit.
Diagram 1 shows a beam balance. A beaker with a wire loop balances the standard masses. The beaker is then removed and hung from a spring. The spring extends by 5.0 cm, as in diagram 2. The experiment is repeated with the same apparatus on the Moon, where the acceleration of free fall is less than on Earth. Which statement describes what happens on the Moon? A. The beam balance is balanced and the spring extends by 5.0 cm. B. The beam balance is balanced and the spring extends by less than 5.0 cm. C. The right-hand balance pan is higher and the spring extends by 5.0 cm. D. The right-hand balance pan is higher and the spring extends by less than 5.0 cm.
Answer:
the answer would be A
Explanation:
Which optical devices spread light apart?
A. A and B
B. A and D
C. B and D
D. B and C
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Optical Devices.
Now basically here the devices that can spread light over apart are the CONCAVE LENS and Convex mirror.
so the Answer is
C. B and D
The optical devices that spread light apart is B and D.
What are optical devices?Optical devices are implements or instruments that process,analyses light waves and interprete it in order to enhance an image for visibility and determine the features of such image.
Therefore, The optical devices that spread light apart is B and D.
Learn more about optical devices below.
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The binding energies of all nuclei are negative. true or false
Answer:
False.
Explanation:
Nuclei decay from a more stable form to a less stable form.
Answer:
False
Explanation:
which of the following does not negatively affect the health of a watershed? A. Surface runoff from roads, sidewalks, and roofs. B. Sewer overflow from combined sewer systems. C. Wilderness areas. D. Chemicals used on farmland.
Answer:
A. Surface runoff from roads, sidewalks, and roofs
C. Wilderness areas. will mostly likely not affect the health of watershed
Explanation:
Options A and C are not really harmful to the health of watershed, but chemicals used on farmlands and overflow from combined sewer systems can contaminate watershed adversely, which can be a major cause of the cholera outbreak (a water borne disease)
this is a non graded disscussion i want to fill out it is just a worksheet to help me get better 30 points
Answer:
1.) 30m/s
2) 5m/s
3) 40Hz
4) 400Hz
5) 300Hz
6) 0.77m
7) 0.386m
8) 0.625m
9) 100m/s
10) 50m/s
Explanation:
The speed of a wave (V) equals :
V = fλ ; where f = frequency, λ = wavelength
1.) f = 100Hz, λ = 0.30m
v = 100 * 0.30 = 30m/s
2) f = 50Hz λ = 0.10m
v = 50 × 0.10 = 5m/s
3) v = 20m/s, λ= 0.5m
f = v / λ
f = 20 / 0.5 = 40Hz
4) v = 80m/s, λ= 0.2m
f = 80/0.2 = 400Hz
5) v = 120m/s, λ = 0.4m
f = 120 / 0.4 = 300Hz
6) v = 340m/s, f = 440Hz
λ = v / f ; 340 / 440 = 0.77m
7) v = 340m/s, f = 880Hz
λ = 340 / 880 = 0.386m
8) v = 250m/s, f = 400
λ = 250 / 400 = 0.625m
9) f = 50Hz, λ = 2m
v = 50 × 2 = 100m/s
10) f = 100Hz, λ = 0.5m
v = 100 × 0.5 = 50m/s
A stone was projected at an angle of 40o and initial velocity of 20m/s. (a.)Determine the time of flight (b)Maximum height.
Answer:
A.) 1.3 seconds
B.) 0.42 m
Explanation:
A.) You are given the angle of projection to be 40 degrees and initial velocity of 20m/s.
At vertical component
U = Usin 40 that is,
U = 20sin40
Using the first equation of motion under gravity
V = U - gt
Let V = 0
0 = UsinØ - gt
gt = UsinØ
t = UsinØ/g
Where U = 20 m/s
Ø = 40 degree
g = 9.8 m/s^2
Substitutes all the parameters into the formula
t = 20sin40/9.8
t = 1.3 seconds
Total time of flight T = 2t
T = 2 × 1.3 = 2.6 s
B.) To calculate the maximum height,
You will use the formula
V^2 = U^2 - 2gH
At maximum height, V = 0
2gH = Usin^2Ø
H = Usin^2Ø/ 2g
Substitutes all the parameters into the formula
H = 20 sin^2(40) ÷ 2(9.8)
H = 8.2635/19.6
H = 0.42 m
Which of the following is the best thermal insulator
A. Air
B. Iron
C. Water
D. Aluminum
Answer: a. air
Explanation:
Generally, the lower the density of the material, the better insulator the material is: this is because in materials with very low density, particles are very spread apart, so they cannot collide with each other, and so the vibrations of the particles (which determine how hot a substance is) cannot be transmitted very efficiently.
In the options listed in this problem, air is the material with lowest density, therefore it is the best thermal insulator among them.
Answer:
A. Air
Explanation:
It is correct in Ареx.
Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity vs. time graph can be used to calculate the displacement of the object?
the area of the rectangle under the line
the area of the rectangle above the line
the area of the rectangle plus the area of the triangle under the line
the area of the rectangle plus the area of the triangle above the line
Answer:
The area of the rectangle plus the area of the triangle under the line
Explanation:
In this case, the object moves with constant acceleration. Initial speed of the object is 0.
Equation of kinematics :
v = u +at
v = at
v is directly proportional to time. If means that the graph is straight line passing through origin. We know that area under v-t graph gives displacement. So, the correct option is (c).
Answer:
c) the area of the rectangle plus the area of the triangle under the line
Explanation:
edge2021
What happens to the object if the line crosses the x-axis from the positive portion of a velocity versus time diagram?
Answer:
A velocity time graph shows the change of velocity of an object with respect ot time. If the slope of the graph is increasing in the postive region, it means that the velocity is changing, if the slope is decreasing, it means the the velocity is decreasing, but the object is moving in the same direction (positve direction).
If this slope intersects the graph at x-axis, it means that the body has 0 velocity and has become still. After that, if the line enters in the negative region, it means that its velocity is started to increases again, but the body is movinging in the opposite direction (negative direction)
A 15.0 cm object is 12.0 cm from a convex mirror that has a focal length of -6.0 cm. What is the height of the image produced by the mirror? A. –5.0 cm B. 7.5 cm C. -7.5 cm D. 5.0 cm
Answer: D. 5cm
Explanation:
Given the following :
Focal length (f) = - 6.0 cm
Height of object = 15.0cm
Distance of object from mirror (u) = 12.0cm
Height of image produced by the mirror =?
Firstly, we calculate the distance of the image from the mirror.
Using the mirror formula
1/f = 1/u + 1/v
1/v = 1/f - 1/u
1/v = 1/-6 - 1/12
1/v = - 1/6 - 1/12
1/v = (- 2 - 1) / 12
1/v = - 3 / 12
v = 12 / - 3
v = - 4
Using the relation :
(Image height / object height) = (- image distance / object distance)
Image height / 15 = - (-4) / 12
Image height / 15 = 4 / 12
Image height = (15 × 4) / 12
Image height = 60 / 12
Image height = 5cm
Answer:
D. 5 cm
Explanation:got it right
A graph titled Position versus Time shows time in seconds on the x axis, numbered 0 to 5, position in meters on the y axis, numbered 0 to 4. The graph has a horizontal line starting at (0, 3) to (5, 3). Given the information in the velocity vs. time graph, what is the displacement of the object after 1 second? m After 3 seconds? m After 5 seconds? m
Answer:
After 1 second: 3
After 3 seconds: 9
After 5 seconds: 15
Explanation:
You just multiply the time and velocity.
1 x 3 = 3, 3 x 3 = 9, etc.
Answer:
C.) The bicycle is not in motion.
Explanation:
What would be the mass of the ball described in the photo?
Answer:
- Mass of the ball = 45 Kg
Explanation:
velocity attained by the ball:
Distance/time= 54/9 = 6m/s (meter per sec)
As work done on ball = distance * force applied
= 54*15
= 810 J ----------------- (i)
acc. to the conservation of energy:
work done = kinetic energy + potential energy
= 1/2*m*[tex]v^{2}[/tex] + 0(as object is on ground)
= 1/2*m*[tex]6^{2}[/tex]
= 1/2*36*m
= 18*m ------------------- (ii)
∵,(i) =(ii)
18*m = 810
m=810/18
m= 45kg
I have a test tomorrow and I can't find the definitions in my book so can you pls help me study by answering the following question? thnx! I will also mark the brainliest.
Answer:
See explanation
Explanation:
An element is a substance that cannot be chemically converted to another substance or broken down chemically into other substances.
Elements are represented by symbols. The symbol of an element may be the first one or two letters from its English or Latin name. For instance, the symbol of nitrogen is N. This symbol was derived from the first letter of its English name. The symbol for sodium is Na. This was derived from the first two letters of its Latin name, Natrium.
The periodic table is divided into horizontal rows called periods and vertical columns called groups. All members of the same period have the same number of electron shells while all members of the same group have the same number of valence electrons.
Metals are found towards the left hand side of the periodic table while non metals are found towards the right hand side of the periodic table. Metals looses electrons easily while nonmetals accepts electrons easily. Metals are good conductors of heat and electricity while non metals are poor conductors of heat and electricity.Metalloids have properties intermediate between those of metals and non metals and are found at the boarder line between metals and non metals in the periodic table. Metalloids include; silicon, boron, germanium, etc. The electrical conductivity of metalloids increases with temperature while the electrical conductivity of metals decreases with temperature.
The lack of ________ between the train and the tracks allow the train to reach unbelievable speed.
Answer:
Friction
Explanation:
Friction is the force that is created when two objects rub against each other. All objects are rough, even though it might not appear that way, on the microscopic scale. These little grooves and ridges get stuck against each other when two objects are moved against each other, and they slow down motion. If there is no friction between a train and its tracks, then it can continue to accelerate without slowing down. Hope this helps!
In general, the the string or air column of a musical instrument is, the more harmonics are generated.
Answer:
In general, the LONGER the string or air column of a musical instrument is, the more harmonics are generated.
What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 0.10 m? What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
Answer:
a) What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 0.10 m?
5m/s
b) What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
40Hz
Explanation:
a) What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 0.10 m?
Wave speed(v) = Frequency(f) × Wavelength (λ)
= 50Hz × 0.10m
=5m/s
b) What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?
The formula for Frequency when given wave speed and wave length = Wave speed/ wave length
f = v/λ
Frequency = 20m/s ÷ 0.50m
Frequency = 40Hz
Answer:
40 Hz
Explanation:
A hollow, uniformly charged sphere has an inner radius of r1 = 0.105 m and an outer radius of r2 = 0.31 m. The sphere has a net charge of Q = 1.9 μC. What is the magnitude of the electric field, in newtons per coulomb, at a distance of r = 0.17 m from the center of the sphere?
Answer:
E = 77532.42N/C
Explanation:
In order to find the magnitude of the electric field for a point that is in between the inner radius and outer radius, you take into account the Gauss' law for the electric flux trough a spherical surface with radius r:
[tex]\int E\cdot dS=\frac{Q}{\epsilon_o}[/tex] (1)
Q: net charge of the hollow sphere = 1.9*10-6C
ε0: dielectric permittivity of vacuum = 8.85*10^-12 C^2/Nm^2
Furthermore, you have that the net charge contained in a sphere of radius r is:
[tex]Q=\rho V=\rho \frac{4\pi (r^3-r_1^3)}{3}[/tex] (2)
with the charge density is:
[tex]\rho=\frac{Q}{\frac{4}{3}\pi(r_2^3-r_1^3)}[/tex] (3)
r2: outer radius = 0.31m
r1: inner radius = 0.105m
The electric field trough the Gaussian surface is parallel to the normal to the surface, the, you have in the integral of the equation (1):
[tex]\int E\cdot dS=E(4\pi r^2)[/tex] (4)
where you have used the expression for a surface of a sphere.
Next, you replace the expressions of equations (2), (3) and (4) in the equation (1) and solve for E:
[tex]E(4\pi r^2)=\frac{1}{\epsilon_o}\frac{Q}{\frac{4}{3}\pi(r_2^3-r_1^3)}(\frac{4\pi (r^3-r_1^3)}{3})\\\\E=\frac{1}{\epsilon_o}\frac{Q(r^3-r_1^3)}{4\pi r^2(r_2^3-r_1^3)}[/tex]
you replace the values of all parameters, and with r = 0.17m
[tex]E=\frac{(1.6*10^{-6}C)((0.17m)^3-(0.105m)^3)}{4\pi(8.85*10^{-12}C^2/Nm^2)(0.17m)^2((0.31m)^3-(0.105m)^3)}\\\\E=77532.42\frac{N}{C}[/tex]
The magnitude of the electric field at a distance r=0.17m to the center of the hollow sphere is 77532.42N/C
Which statement best describes scientific theories?
A. Scientific theories attempt to explain an entire group of related phenomena.
B. Scientific theories are based on facts that describe natural events.
C. Scientific theories describe natural events but do not explain them.
D. Scientific theories are facts based on observations of events in the natural world.
Answer:
the answer is A
Explanation:
Scientific theories attempt to explain an entire group of related phenomena.
Scientific theories attempt to explain an entire group of related phenomena. The correct option is A.
What is scientific theory?A scientific theory is a well-thought-out explanation for natural-world observations that has been built using the scientific method and incorporates many facts and hypotheses.
A scientific law predicts the outcome of a set of initial conditions. It could predict your unborn child's hair color or the distance a baseball travels when launched at a specific angle.
A theory, on the other hand, attempts to provide the most logical explanation for why things happen the way they do.
Scientific theories attempt to explain a broad range of phenomena. A theory not only explains known facts; it also allows scientists to predict what they will see if the theory is correct.
Thus, the correct option is A.
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3. How do we measure the average kinetic motion of molecules in a solution?
Priscilla is driving her car on a busy street and Harvey passes her on his motorcycle. What will happen to the sound from his motorcycle after it
passes her car?
Answer:
what will happen to the sound is the wavelength increases thus frequency decreases so the sound decreases as he move away from her car..
A fire truck drives 3 miles to the east, then 1.2 miles to the west. What is the
displacement of the fire truck?
A. 4.2 miles east
B. 4.2 miles west
C. 4.2 miles
D. 1.8 miles east
Answer:
the answer is D. you have to go 3 miles to the east and then subtract the distance that the fire truck traveled to the the west.
Answer: D. 1.8 miles east
Explanation:
(Each "→" or "←" = .2 miles)
3 miles east: →→→→→ →→→→→ →→→→→
minus 1.2 miles west: ← ←←←←←
3 - 1.2 = 1.8 miles east: →→→→→ →→→→
ASSIGNMENTS
COURSES
Assignment
Attempt 1 of 3
SECTION 101
QUESTION 9 OF 35
A box is suspended from a series of cables as shown below. The angle of the cable attached to the ceiling is 30°
relative to the horizontal. The cable to the left has a tension force of 40 N. What is the approximate weight of the box?
30°
40N
23N
Answer:
23 N
Explanation:
By using the diagram above
[tex] \tan(30) = \frac{x}{40} [/tex]
By cross multiplying
[tex]x = \tan(30) \times 40[/tex]
[tex]x = 0.577 \times 40[/tex]
[tex]x = 0.577 \times 40[/tex]
[tex] x = 23.08[/tex]
[tex]approximately \: 23 [/tex]
A camera lens focuses on an object 75.0 cm from the lens. The image forms 3.50 cm behind the lens. What is the magnification of the image?
Answer:
- 0.0466666667
Explanation:
We are told in the question above that:
A camera lens focuses on an object 75.0 cm from the lens. The image forms 3.50 cm behind the lens.
The formula for Magnification of an image = - image distance / object distance
Image distance = 3.50 cm
Object distance = 75 cm
Magnification = - 3.5/75
= -0.0466666667
= Approximately = -0.0467
Therefore, the magnification of the image is -0.0467
Answer:
0.557
Explanation:
That's the answer to a similar problem that asks us to solve for how tall the image is.
if it's 12.4 cm tall
correct for Acellus
This one:
A camera lens focuses on an image 78.0 cm from the lens
The image is 3.5 cm behind the lens
If it's 12.4 cm tall, how tall is the image
hope it helps