Answer:
The correct option is;
Sending all passengers below while refueling
Explanation:
Safety tips for refueling a boat includes;
1) People that are not involved in the refueling of the boat should be made to leave the area
2) The engines, electronics, ignition system and open flames should be off
3) Ensure the boat is properly secured to the dock
4) Do not use the hands-free clips and try not to be distracted
5) Ensure not to completely fill the fuel tank as fuel has the tendency to expand as its temperature rises. The tank should have about 90% filling
Answer:
Close all hatches and doorsthis 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 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.
hi:) what does the one highlighted in pink mean?
Answer:
The acceleration of the car at the instant when t=3s is found by taking the gradient of the tangent at the point t=3.
The tangent are those dotted lines sloping upwards in the graph.
Tangent: A straight line that touches the curve and does not intersect it.
The reason why they wrote instantaneous is because the acceleration (or gradient of graph) is not constant throughout hence it is just at the moment when t=3s.
Gradient is used to find the acceleration of a speed time graph.
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.
HEEELLPP!! SEND HELP!! Sometimes goals need to be changed. What are some possible reasons for this?
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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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 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:
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]
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
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
The electromagnetic force that acts on the protons in the nucleus of an atom is _____ the strong nuclear force that acts on the same nucleus. Question 4 options: stronger than weaker than the same as approximately half
The electromagnetic force that acts on the protons in the nucleus of an atom is stronger than the strong nuclear force that acts on the same nucleus.
What is electromagnetic force?The current flows in the conductor, when a conductor is placed in a magnetic field. The magnetic field and the current both produce the magnetic force in that conductor. This force is known as the electromagnetic force.
The nuclear force is the force between the two nuclei. They both have positive charge. The force between them is weaker than the electromagnetic force which is the attractive force.
Thus, the electromagnetic force that acts on the protons in the nucleus of an atom is stronger than the strong nuclear force that acts on the same nucleus.
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Answer:
stronger than
Explanation:
took the mcq exam
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.
14. Which of the following ray diagrams is correct for the mirror shown?
Answer:
C is the correct answer
Answer:
B
Explanation:
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.
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 rope exerts a force F on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s2 near the surface of the earth. What is the kinetic energy (in J) of the crate when it is 4.0 m above the floor?
Answer:
400 J
Explanation:
Given:
Δy = 4.00 m
v₀ = 0 m/s
a = 5.00 m/s²
Find: v²
v² = v₀² + 2aΔy
v² = (0 m/s)² + 2 (5.00 m/s²) (4.00 m)
v² = 40.0 m²/s²
Find KE:
KE = ½ mv²
KE = ½ (20.0 kg) (40.0 m²/s²)
KE = 400 J
The kinetic energy of the object is the energy is that energy which possesses due to the its motion. It is the work needed to accelerate a body of a given mass from rest to its stated velocity .
Kinetic energy (KE) = 1/2 *m* v^2
mass = 20 kg (given )
accelerates = a = 5 m/s^2
to find = v ?
u = 0
using newton's kinematics equation
v^2 - u^2 = 2as
v^2 - 0 = 2 * (5) * (4)
v^2 = 40
v = [tex]\sqrt{40}[/tex] m/s
Kinetic energy (KE) = 1/2 *m* v^2
= 1/2 * (20 kg) * 40 m/s
= 400 J
The kinetic energy (in J) of the crate when it is 4.0 m above the floor will be 400 J
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Which factor causes atmospheric pressure? A. Altitude above sea level. B. Weight of the atmosphere above the surface. C. Air currents in the atmosphere over the ocean. D. Sizes and shapes of clouds.
Answer:
B. Weight of the atmosphere above the surface.
Explanation:
The pressure that the atmosphere of the earth exerts is termed to be the atmospheric pressure. This pressure is applied on the surface of the air because of the gravitational pull. With the increase in altitude, the atmospheric pressure decreases. The atmospheric weight pushes itself downwards because of the gravity, this creates the pressure. The factor that causes atmospheric pressure is the 'Weight of the atmosphere above the surface.'
The helium in the balloon has a mass of 0.00254 kg. The balloon has a volume of 0.0141 m3. Calculate the density of helium. Choose the correct unit from the box. m3 / kg kg / m3 kg m3
Answer:
Density (D) = 0.18014184397163 kg/m^3
Steps:
D = m / V
D= 0.00254 kg / 0.0141 M^3
D= 0.18014184397163 kg/m^3
Explanation:
Use this calculator for help and make sure to change the units on the right side. (can't use links in brainly but look up "Density Calculator calculator . net)
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)
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:
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:
A car has a mass of 1,00* 10 kilograms, and it has an acceleration of 4.5 meters/second what is the net force on the car?
OA 0.910 newtons
OB 25*10 newtons
OC 45x10 newtons
OD 90x10 newtons
OE 96*10 newtons
Answer:
4.5 × 10³
Explanation:
F=ma
F = 100*10 × 4.5
F = 4.5 × 10³
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.
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.
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!
Throwing a football is an example of what type of motion ?
a) two-dimensional
b) one-dimensional
c) displacement
d) distance
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
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.
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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
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