Answer:
B. A system cannot take in additional matter.
Explanation: The total amount of energy in the universe remains constant, it can merely change from one form to another.
Hope it helps you:)))
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Question 2 of 34
You are adding two vectors pointing in the same direction. How do you find
the magnitude of the resultant vector?
OA. By subtracting the magnitude of the shorter vector from the
magnitude of the longer vector
B. By adding the magnitudes of the two vectors
O C. By subtracting the magnitudes of the two vectors
D. By subtracting the magnitude of the longer vector from the
magnitude of the shorter vector
You can find the magnitude of the resultant vector : (B). By adding the magnitudes of the two vectors
Meaning of Vectors
A vector can be defined as any quantity which possesses magnitude and also has direction.
A Vector quantity is very useful because This type of quantity gives more details to the student or teacher analyzing it.
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a box is at rest on a ground. An unbalance force acts on the box causes it to start. The box moves 10 meters in 2 seconds and then stop. why did the box moving? what is the box's average speed?
Two particles with oppositely signed charges nC are placed at two of the vertices of an equilateral triangle with side length 3 m. What is the magnitude of the electric field at the third vertex of the triangle
The magnitude of the electric field at the third vertex of the triangle is determined as zero.
Electric field at the third vertex of the triangle
The electric field at the third vertex of the equilateral triangle due to the other charges placed on the first and second vertices is calculated as follows;
E = E(13) + E(23)
E = (kq₁)/r² + (kq₂)/r²
where;
q1 is positive chargeq2 is negative chargeE = (kq₁)/r² - (kq₂)/r²
E = 0
Thus, the magnitude of the electric field at the third vertex of the triangle is determined as zero.
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The chart shows the times and accelerations for three drivers.
A 3-column table with 3 rows. The first column labeled drover has entries Kira, Dustin, Diego. The second column labeled acceleration has entries 5.2 meters per second, 8.3 meters per second, 6.5 meters per second. The third column labeled time has entries 6.9 seconds, 3 seconds, 4.2 seconds.
Which lists them from greatest to lowest change in velocity?
Dustin → Diego → Kira
Dustin → Kira → Diego
Kira → Dustin → Diego
Kira → Diego → Dustin
The lists from greatest to lowest change in velocity.Dustin → Diego → Kira. Option A is correct.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
The acceleration is obtained one by one from the given data as the ratio of the velocity to the time.
For the acceleration of each, you can refer to the excel table attached below.
The velocity changes are listed from largest to least. Dustin and Diego Kira.
Hence, option A is the right answer.
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Answer:
D. Kira → Diego → Dustin
Explanation:
Got 100% on the test. Y'all have a good day! :p
State a hypothesis about what might happen as you proceed through the lab.
A hypothesis about what might happen in the lab might be 'oxygen will react with hydrogen to form water molecules'.
What is a hypothesis?A hypothesis is a given explanation of a particular scientific question emerged by observing the real world.
Hypotheses are explanations that must be tested (either confirmed or rejected) by using the scientific method.
In conclusion, a hypothesis about what might happen in the lab might be 'oxygen will react with hydrogen to form water molecules'.
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Two bulbs connected in
parallel shine more brightly than when they
are connected to the same voltage source in
series. explain why this doesn't violate the law
of conservation of energy.
Explanation:
Explain why this doesn't violate the law of conservation of energy.
The bulbs shine less brightly in a parallel because the charges
are flowing to more than one place, distributing the charge
evenly between the two bulbs. Less charge is going to each bulb
since it is going two places, so they will appear less bright
A bowling ball with a mass of 8 kg is moving at a speed of 5 m/s. What is its
kinetic energy?
OA. 200 J
OB. 100 J
OC. 40 J
OD. 20 J
The kinetic energy of a bowling ball moving at speed is 100 J. The correct option is B.
What is kinetic energy?The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as
K.E = 1/2 mv²
Given is the Mass of a bowling ball, m =8 kg and Velocity of a baseball, v = 5 m/s
substitute the values, we have
K.E = 1/2 x 8 x (5)²
K.E = 100 J
Hence, the kinetic energy of the bowling ball is 100 J.
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why is physics the hardest subject
How do riders in a Ferris wheel possess Translatory motion but not circular motion?
Answer:
A wheel on a car, however, rotates around the car's axle, so it does have rotational motion. For this example, if you were to pick a single point on the edge of the wheel, you could also say that it has circular motion.
The diameter of the Earth is 12.7 x 10 6 m. The diameter of Mars is 6800 km.
The difference in the diameters of the two planets is:
Answer:
5.9 × 10⁶m
Explanation:
The diameter of the Earth is 12.7 ×10⁶m.We have to convert the diameter of the mars in the same exponent as that of the earth so that we can easily subtract.The diameter of mars = 6800km = 6800 × 10³ m = 6.8 × 10⁶mNow we can subtract the diameters.The difference between the diameters = (The Diameter of Earth - The diameter of Mars)= 12.7×10⁶ - 6.8 × 10⁶
= 5.9 × 10⁶m
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what do you mean by potential energy of an object is 60J
Answer:
60Joules
Explanation:
Potential energy is the amount of 'work done' on an object, by changing it's position.
The formula is gravitational Potential energy= mass (kg) × gravity (Newtons) × height (m)
13. in batesian mimicry, a palatable species gains protection by mimicking an unpalatable one. imagine that individuals of a palatable, brightly colored fly species are blown to three remote islands. the first island has no predators of that species; the second has predators but no similarly colored, unpalatable species; and the third has both predators and a similarly colored, unpalatable species. in a short essay (100-150 words), predict what might happen to the coloration of the palatable species on each island through evolutionry time if coloration is a genetically controlled trait. explain your predictions.
Batesian mimicry is an adaptive feature associated with the coloration of a given species in a given environment.
What is Batesian mimicry?Batesian mimicry can be defined as a type of adaptive feature associated with the coloration of a particular species and/or population.
On the first island, the color of the population won't change because of the absence of predators.
On the second island, the color of the population will change because of the presence of predators that can be alerted by the color.
On the third island, the color of the population won't change because of the presence of a species with a similar color.
In conclusion, Batesian mimicry is an adaptive feature associated with the coloration of a given species in a given environment.
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what is matter made of
Answer:
Atoms
Explanation:
Answer:
All matter is made up of atoms. Atoms come together to form molecules, which are the building blocks for all types of matter.
Explanation:
What is a car’s acceleration if it increases its speed from 5 m/s to 20 m/s in 3 s? 10 m/s2 –15 m/s2 15 m/s2 5 m/s2
Answer:
5 m/s²
Explanation:
Acceleration = change in speed/time taken
20-5=15
15/3= 5 m/s²
Which two elements have the same number of dots around their chemical symbols in their electron dot disgrams?
The two elements that have the same number of dots around their chemical symbols in their electron dot are Germanium and Silicon.
Dot diagram of elements
The valence electron of an atom can be represented by a lewis dot diagram.
Germanium and silicon belonging to group 14 of the periodic table has 4 dots around their chemical symbols in their electron dot.
Thus, the two elements that have the same number of dots around their chemical symbols in their electron dot are Germanium and Silicon.
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Explain how birds, bats, insects, airplanes, rockets, and hot air balloons achieve their flight.
The birds, bats, insects, airplanes, rockets, and hot air balloons achieve their flight by creating high pressure below the aircraft and low pressure above it
What are living and non-living things?They both consist of fundamentally simple building blocks. They are composed of substances or mass. Atmospheric and molecular building blocks make up the world.
In order to create high pressure below the aircraft and low pressure above it, airplanes employ specially built wings.
The wing receives sufficient airflow past it to counteract the weight and drag of the aircraft by utilizing a device to provide thrust, such as a propeller.
High pressure underneath the aircraft and low pressure above it is produced by specially constructed wings used by airplanes.
The wing receives enough airflow through it by the use of a thrust-generating device, like a propeller, to overcome the weight and drag of the aircraft.
The differences between how living and non-living things fly;
1. Moving both living and non-living objects consumes energy. Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.
In contrast to most air vehicles, where the components that generate lift, wings, and thrust engines or propellers are distinct, the wings stay stationary.
Animal aviators like birds as well as natural parachuters like patagial as well as human inventions like aircraft as well as rockets that can power spacecraft and spaceplanes are just a few examples of the many things that can fly.
Hence, birds, bats, insects, airplanes, rockets, and hot air balloons achieve their flight by creating high pressure below the aircraft and low pressure above it
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a straight current-carrying wire in a uniform magnetic field, oriented at right angles to the wire. The 0.25-m wire carries a 4.75-A current and experiences a force of 0.38 N. What is the strength of the magnetic field?
0.45 T
0.56 T
0.32 T
0.72 T
Hello!
Using the equation for the magnetic force on a current-carrying wire:
[tex]F_B = \vec{B} \times i\vec{L}[/tex]
[tex]F_B[/tex] = Magnetic Force (0.38 N)
B = Magnetic field strength (T)
i = Current in wire (4.75 A)
L = Length of wire (0.25 m)
This is a cross product, so we can rewrite the equation as:
[tex]F_B = BiLsin\phi[/tex]
Where φ is the angle between the magnetic field vector and the length vector. In this instance, since the field is perpendicular to the wire, sin(90) = 1. We can simplify the equation to:
[tex]F_B = BiL[/tex]
Rearrange the equation to solve for 'B':
[tex]B = \frac{F_B}{iL}[/tex]
Plug in given values and solve.
[tex]B = \frac{0.38}{(4.75 * .25)} = \boxed{0.32 T}[/tex]
The strength of the magnetic field will be 0.32 T.Option B is correct.
What is magnetic field strength?The number of magnetic flux lines on a unit area passing perpendicular to the given line direction is known as induced magnetic field strength .it is denoted by B.
Given data:
(I) current = 4.75-A
(B)induced magnetic field strrength=?
(L)length of the wire=0.25-m
(F)Magnetic force=0.38 N
The strength of the magnetic field is found as:
[tex]\rm F_B=BILsin \theta \\\\\ \theta = 90^0 \\\\ \rm F_B=BIL \\\\[/tex]
Substitute the values:
[tex]\rm 0.38 = B \times 4.75 \times 0.25 \\\\\ B= \frac{0.38}{4.75 \times 0.25 } \\\\\ B=0.32 \ T[/tex]
The strength of the magnetic field will be 0.32 T.
Hence, option B is correct.
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A spinning satellite begins to fold two solar panels inward as shown. How does satellite's angular velocity change as the panels fold in completely?
A. It remains constant.
B. It increases.
C. It drops to zero.
D. It decreases.
Which resistors in the circuit must have the same amount of charge passing through each second?
Answer:
Resistors C' and D'
Explanation:
Use the information from the graph to answer the question.
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 12, velocity in meters per second on the y axis, numbered 0 to 45. A line starts at (0, 40) and ends at (12, 10).
What is the acceleration of the object?
Answer:-2.5m/s^2
Explanation:
facts
The acceleration of the object would be -2.5 m/s², the negative sign represents the deaccelerating motion of the object.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
acceleration =change in velocity/change in time
The slope of the velocity time graph represents the acceleration of the object.
The slope of the graph = change in the y coordinates (velocity)/ change in the x coordinate (time)
The slope of the graph =( 10-40)/( 12-0)
= -2.5 m/s²
Thus, the acceleration of the object comes out to be -2.5 m/s².
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You are standing on a river bank. The river is flowing at a rate of $2.0\;\mathrm{ m/s}.$ You see a duck is floating in the river without swimming, and is being carried by the river downstream. You throw two pieces of bread at the duck. One piece lands upstream of the duck, and the other downstream equal distance. The duck can swim at $1.0 \; \mathrm{m/s}.$ The duck is hungry, and wants to reach the bread in the shortest amount of time. What should the duck do
Let the upstream breadcrumb's position act as the origin, so the position at time [tex]t[/tex] of upstream crumb [tex](B_U)[/tex], duck [tex](D)[/tex], and downstream crumb [tex](B_D)[/tex] are, respectively,
[tex]x_{B_U} = \left(2.0\dfrac{\rm m}{\rm s}\right) t[/tex]
[tex]x_D = d\,\mathrm m + v_D t[/tex]
[tex]x_{B_D} = 2d\,\mathrm m + \left(2.0\dfrac{\rm m}{\rm s}\right) t[/tex]
where [tex]d[/tex] is the distance (in m) between the duck and either crumb at the start, and [tex]v_D[/tex] is the velocity of the duck relative to the Earth.
To get both breadcrumbs, the duck has to choose between chasing the upstream or downstream crumb first.
• If the upstream crumb is chosen first, then [tex]v_D[/tex] is 2.0 - 1.0 = 1.0 m/s. Find the time it takes for the duck to reach the upstream crumb:
[tex]x_{B_U} = x_D \implies \left(2.0\dfrac{\rm m}{\rm s}\right) t = d + \left(1.0\dfrac{\rm m}{\rm s}\right) t \\\\ \implies t = d \, \mathrm s[/tex]
In this time, the duck covers a distance of
[tex]x_D = d\,\mathrm m + \left(1.0\dfrac{\rm m}{\rm s}\right) (d\, \mathrm s) = 2d \, \mathrm m[/tex]
while the downstream crumb will have traveled a distance of
[tex]x_{B_D} = 2d\,\mathrm m + \left(2.0\dfrac{\rm m}{\rm s}\right) (d \,\mathrm s) = 4d \,\mathrm m[/tex]
putting a total distance of [tex]2d+4d=6d\,\mathrm m[/tex] between the duck and the remaining crumb.
Take the duck's new position to be the new origin. When the duck turns around and travels with the current, its speed [tex]v_D[/tex] will be 2.0 + 1.0 = 3.0 m/s. Then at time [tex]t[/tex], the duck and remaining crumb have position relative to the new origin given by
[tex]x_D' = \left(3.0\dfrac{\rm m}{\rm s}\right) t[/tex]
[tex]x_{B_D}' = 6d \,\mathrm m + \left(2.0\dfrac{\rm m}{\rm s}\right) t[/tex]
Find the time the duck needs to catch up to the downstream crumb:
[tex]x_D' = x_{B_D}' \implies \left(3.0\dfrac{\rm m}{\rm s}\right) t = 6d\,\mathrm m + \left(2.0\dfrac{\rm m}{\rm s}\right) t \\\\ \implies t = 6d \,\mathrm s[/tex]
Then the total time the duck needs to get both crumbs is [tex]d + 6d = 7d \,\mathrm s[/tex].
• If instead the downstream crumb is chased down first, we start with [tex]v_D[/tex] = 3.0 m/s, so that
[tex]x_D = x_{B_D} \implies d\,\mathrm m + \left(3.0\dfrac{\rm m}{\rm s}\right) t = 2d\,\mathrm m + \left(2.0\dfrac{\rm m}{\rm s}\right) t \\\\ \implies t = d \, \mathrm s[/tex]
In this time, the duck covers a distance of
[tex]x_D = d\,\mathrm m + \left(3.0\dfrac{\rm m}{\rm s}\right) (d\,\mathrm s) = 4d \,\mathrm m[/tex]
while the upstream crumb moves
[tex]x_{B_U} = \left(2.0\dfrac{\rm m}{\rm s}\right) (d\,\mathrm s) = 2d \,\mathrm m[/tex]
The distance between the duck and remaining crumb is then [tex]4d-2d=2d\,\mathrm m[/tex]. Now the duck turns around with speed [tex]v_D[/tex] = 1.0 m/s. If the crumb's new position is taken to be the origin, then
[tex]x_{B_U}' = \left(2.0\dfrac{\rm m}{\rm s}\right) t[/tex]
[tex]x_D' = 2d\,\mathrm m + \left(1.0\dfrac{\rm m}{\rm s}\right) t[/tex]
Find the time it takes for the duck to get the last crumb:
[tex]x_{B_U}' = x_D' \implies \left(2.0\dfrac{\rm m}{\rm s}\right)t = 2d\,\mathrm m + \left(1.0\dfrac{\rm m}{\rm s}\right) t \\\\ \implies t = 2d\,\mathrm s[/tex]
Then the duck can get both crumbs in a total of [tex]d+2d=3d\,\mathrm s[/tex].
To get both crumbs in the shortest time, the duck should go after the downstream crumb first. This path over 2 times faster than the other.
If it takes you 10 seconds to move a chair 5 meters across the floor, using a force of 2 Newtons, how much power did you put out?
20 joules per second
100 joules per second
O 1 joules per second
4 joules per second
Answer:
power=work done÷time taken
2×5=10
10÷10=1
ans 1J per second
5.
A device known as the nMRI, or nuclear magnetic resonance imager, often called an MRI for simplicity, is used for what purpose?
A to generate electricity
B to apply lasers to precision measurements of the nucleus
C to create an image of objects inside other objects
D to measure geologic pressures deep underground in volcanically active regions
Answer:
C. to apply lasers to precision measurements of the nucleus
Explanation:
Magnetic resonance imaging (MRI) is based on the principles of nuclear magnetic resonance (NMR), a spectroscopic technique used to obtain microscopic chemical and physical information about molecules.
Olivia is on a swing at the playground.
A girl is swinging on a swing set. At W she is about 45 degrees up and to the left. At X she is near the bottom of the swing just to the left. At Y she is near the bottom of the swing just to the right. At Z she is about 45 degrees up and to the right.
If the swing is moving from W to Z, at which point is her kinetic energy increasing and her potential energy decreasing? (based on a starting point of W)
W
X
Y
Z
Mark this and return Save and Exit Next Submit
Olivia is on a swing at the playground. The kinetic energy is increasing and her potential energy decreasing at point X.
What is kinetic energy and potential energy?The kinetic energy of an object is the ability to do work by virtue of its motion and potential energy is the ability to do work by virtue of its position.
At point W and Z, Olivia is at the maximum displacement from the mean position, where kinetic energy is zero and potential energy is maximum.
At point Y, it is approaching to increase its potential energy and decreasing kinetic energy. Opposite to this, at point X, kinetic energy is increasing and potential energy is decreasing.
Thus, the kinetic energy is increasing and her potential energy decreasing at point X.
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A 740 kg car traveling 19 m/s comes to a complete stop in 2.0 s. What is the force exerted on the car during this stop?
Answer:
Force exerted on the car is 7030 N.
Explanation:
It is given that,
Mass of the car, m = 740 kg
Initial speed of the car, u = 19 m/s
Final speed of the car, v = 0
Time taken, t = 2 s
Let F is the force exerted on the car during this stop. We know that it is equal to the product of force and acceleration. Mathematically, it is given as :
F=m\times \dfrac{v-u}{t}F=m×tv−u
F=740\times \dfrac{0-19}{2}F=740×20−19
F = -7030 N
So, the force exerted on the car during this stop is 7030 N. Hence, this is the required solution.
A diffraction grating used in a spectrometer causes the third-order maximum of blue light with a wavelength of 490 nm to form at an angle of 6.33º from the central maximum (m = 0). What is the separation between the lines of the grating?
The separation between the lines of the grating is 13.33μm.
What is diffraction grating?The diffraction grating is the continuous lines with very minute slits or grating space in mm. It divides light composed of various wavelengths into light components by particular wavelength.
dsinθ = nλ
Substitute n =3, λ =490 x 10⁻⁹ m and angle θ =6.33°, we get
d = [3 x 490 x 10⁻⁹ /sin 6.33°]
d = 13.33 x 10⁻⁶ m
Thus, the separation between the lines of the grating is 13.33μm.
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PLEASEE helppp I really need it!
Answer:
the correct answer is Jupiter has moons orbiting it
If you wanted to
reduce the resistance
in a circuit, what
should you do?
A. increase the length of the wire
B. replace a steel wire with a copper wire
C. replace a wide wire with a thin wire
Answer:
Option C
Explanation:
According to the formula
[tex]\\ \boxed{\sf R=\rho\dfrac{\ell}{A}}[/tex]So
If we use wide wire we increase the area of cross section so resistance decreases
1. A person of mass 55 kg is in a bumper car that has a mass of 75 kg. They are together at a velocity of 8 m/s.
a. what's the total momentum of the system
b. what is the momentum of the bumper car after the collision? did it change directions? how do you know?
The momentum of the bumper car after the collision is 1,040 kgm/s.
Momentum of bumper
The change in momentum of the bumper is calculated as follows;
P = v(m1 + m2)
P = 8(55 + 75)
P = 1,040 kgm/s
The momentum of the bumper car after the collision is 1,040 kgm/s.
The direction is still the same.
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- A straight wire, 0.20 m long, moves at a constant speed of 7.0 m/s
perpendicular to a magnetic field of strength 8.0×10-2 T.
A. What EMF is induced in the wire?
B. What is the direction of the induced current?
C. Determine the polarity of point A and point L
D. The wire is part of a circuit that has a resistance of 0.50 Ω. What is the
current through the wire?
(a) The emf induced in the wire is 0.112 V.
(b) The direction of the current will into the page.
(c) The polarity of A will be positive and L will be negative.
(d) The current flowing through the wire is 0.224 A.
EMF induced in the wireThe emf induced in the wire is calculated as follows;
EMF = BLv
EMF = (8 x 10⁻²) x 0.2 x 7
EMF = 0.112 V
Direction of the currentSince, the magnetic field is out of the page, the current will follow counter clockwise and will point into the page.
Polarity of point A and point LThe current is flowing counter currently, hence the polarity of A will be positive and L will be negative.
Current through the wireV = IR
I = V/R
I = (0.112)/0.5
I = 0.224 A
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