.........
Explanation:
Option B..... ...
In which of the following forms of energy might you find specially placed tiles on the floor? O A. passive solar O B. geothermal O c. wind power O D. biomass
Answer:
A, Passive Solar.
Explanation:
You and your two younger siblings are playing on a seesaw. Your little brother, whose mass is 25 kg, sits 2.5 meters to the left of the pivot point, and your little sister, whose mass is 35 kg, sits 1 meter to the left of the pivot point. Because you weigh 70 kg, where should you sit to make the seesaw balance
Answer: 1.4 m
Explanation:
Given
Mass of siblings are 25kg and 35 kg who sits at 2.5 m and 1 m left to pivot.
Suppose the 70 kg mass sits at a distance x from the pivot towards right.
Torque applied by two siblings must cancel the torque of 70 kg mass i.e.
[tex]\Rightarrow 25\times 2.5+35\times1=70x\\\Rightarrow 62.5+35=70x\\\\\Rightarrow x=\dfrac{97.5}{70}\\\\\Rightarrow x=1.392\approx 1.4\ m[/tex]
A gerbil wheel has a radius of 3.2 inches. The gerbil can spin the wheel at a rate of 35 rotations per minute. Find the angular speed of the wheel in degrees per minute and the linear speed of wheel in inches per minute
Given :
A gerbil wheel has a radius of 3.2 inches. The gerbil can spin the wheel at a rate of 35 rotations per minute.
To Find :
The angular speed of the wheel in degrees per minute and the linear speed of wheel in inches per minute.
Solution :
Angular speed is given by :
[tex]\omega = 25\ rpm \\\\\omega = 25\times 360^o \ per \ minute\\\\\omega = 9000^o \ per \ minute[/tex]
Now, velocity is given by :
[tex]v = Radius\times \dfrac{RPM}{60\ sec/min}\times 2\pi\ rad/rev\\\\v = 3.2 \times \dfrac{35}{60}\times 2\pi\\\\v = 11.73\ m/s[/tex]
Hence, this is the required solution.
The security alarm on a parked car goes off and produces a frequency of 960 Hz. The speed of sound is 343 m/s. As you drive toward this parked car, pass it, and drive away, you observe the frequency to change by 75 Hz. At what speed are you driving
Answer: [tex]13.4\ m/s[/tex]
Explanation:
Given
The frequency of the source is [tex]f_o=960\ Hz[/tex]
Change in frequency is [tex]75\ Hz[/tex]
Speed of sound [tex]c=343\ m/s[/tex]
Suppose [tex]v[/tex] is the velocity of the observer
Doppler frequency is given by
[tex]f'=f_o\left(\dfrac{c\pm v_o}{c\pm v_s}\right)[/tex]
Here, the source is at rest
While approaching source, frequency is
[tex]f_1=f_o\left(\dfrac{c+v}{c}\right)\quad \ldots(i)[/tex]
While leaving, frequency is
[tex]f_2=f_o\left(\dfrac{c-v}{c}\right)\quad \ldots(ii)[/tex]
The difference in the frequency is
[tex]\Rightarrow f_1-f_2=75\\\\\Rightarrow f_o\left(\dfrac{c+v}{c}\right)-f_o\left(\dfrac{c-v}{c}\right)=75\\\\\Rightarrow f_o\left(\dfrac{2v}{c}\right)=75\\\\\Rightarrow v=\dfrac{75\times 343}{2\times 960}\\\\\Rightarrow v=13.39\approx 13.4\ m/s[/tex]
What is the acceleration of a race car if it has a mass of 1200kg and is moving with an engine force of 400N
Answer:
0.34 m/s^2
Explanation:
force=mass × acceleration
400 =1200 × acceleration
acceleration=400/1200
=0.34 m/s^2
A child is holding a wagon from rolling straight back down in a driveway that inclined at 20 degree horizontal. if the wagon weigh 150n with what force must the child pull on the handle if the handle is parallel to the incline?
Answer:
F = 51.3°
Explanation:
The component of weight parallel to the inclined plane must be responsible for the rolling back motion of the car. Hence, the force required to be applied by the child must also be equal to that component of weight:
[tex]F = Parallel\ Component\ of\ Weight\ of\ Wagon= WSin\theta\\[/tex]
where,
W = Weight of Wagon = 150 N
θ = Angle of Inclinition = 20°
Therefore,
[tex]F = (150\ N)Sin\ 20^o[/tex]
F = 51.3°
A cell has an emf of 4,5 V.
8.1 What does this statement mean?
Answer:
it means a cell has 4.5Volt of electromtive force.
A train sounds its whistle at a constant frequency as it passes by the platform. Compared to the sound emitted by the whistle, the sound that people on the platform hear as the train moves away has a frequency that is ...
-higher
-the same
-lower
-exactly half
Answer: Higher.
Explanation: The doppler effect essentially. "The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding."
1. A bus starting from rest moves
with a uniform acceleration of
0.1 m s2 for 2 minutes. Find (a)
the speed acquired. (b) the
distance travelled.
Answer:
Speed acquired (Final velocity) = 12 m/s
Distance travelled = 720 meter
Explanation:
Given:
Uniform acceleration = 0.1 m/s²
Initial velocity = 0 m/s
Time taken = 2 minutes = 2 x 60 = 120 second
Find:
(a) Speed acquired (Final velocity)
(b) Distance travelled
Computation:
v = u + at
v = 0 + 0.1(120)
Speed acquired (Final velocity) = 12 m/s
Distance travelled = ut + (1/2)(a)(t²)
Distance travelled = (0)(120) + (1/2)(0.1)(120²)
Distance travelled = (1/2)(0.1)(14400)
Distance travelled = 720 meter
Describe the process of how a bill becomes a law in at least 4-5 sentence
Answer:
Step 1: A Bill Is Born
Anyone may draft a bill; however, only members of Congress can introduce legislation, and, by doing so, become the sponsor(s). The president, a member of the cabinet or the head of a federal agency can also propose legislation, although a member of Congress must introduce it.
Step 2: Committee Action
As soon as a bill is introduced, it is referred to a committee. At this point the bill is examined carefully and its chances for passage are first determined. If the committee does not act on a bill, the bill is effectively "dead."
Step 3: Subcommittee Review
Often, bills are referred to a subcommittee for study and hearings. Hearings provide the opportunity to put on the record the views of the executive branch, experts, other public officials and supporters, and opponents of the legislation.
Step 4: Mark up
When the hearings are completed, the subcommittee may meet to "mark up" the bill; that is, make changes and amendments prior to recommending the bill to the full committee. If a subcommittee votes not to report legislation to the full committee, the bill dies. If the committee votes for the bill, it is sent to the floor.
Step 5: Committee Action to Report a Bill
After receiving a subcommittee's report on a bill the full committee votes on its recommendation to the House or Senate. This procedure is called "ordering a bill reported."
Step 6: Voting
After the debate and the approval of any amendments, the bill is passed or defeated by the members voting.
Step 7: Referral to Other Chamber
When the House or Senate passes a bill, it is referred to the other chamber, where it usually follows the same route through committee and floor action. This chamber may approve the bill as received, reject it, ignore it, or change it.
Step 8: Conference Committee Action
When the actions of the other chamber significantly alter the bill, a conference committee is formed to reconcile the differences between the House and Senate versions. If the conferees are unable to reach agreement, the legislation dies. If agreement is reached, a conference report is prepared describing the committee members' recommendations for changes. Both the House and Senate must approve the conference report
Step 9: Final Action
After both the House and Senate have approved a bill in identical form, it is sent to the president. If the president approves of the legislation, he signs it and it becomes law. Or, if the president takes no action for ten days, while Congress is in session, it automatically becomes law.If the president opposes the bill he can veto it; or if he takes no action after the Congress has adjourned its second session, it is a "pocket veto" and the legislation dies.
Step 10: Overriding a Veto
If the president vetoes a bill, Congress may attempt to "override the veto." If both the Senate and the House pass the bill by a two-thirds majority, the president's veto is overruled and the bill becomes a law.
Explanation:
good luck!
What parts are found in an electric generator? Check all that apply.
Answer:
an armature a permanent magnet brushes slip rings
Explanation:
Answer:
armature, permanent magnet, brushes, slip rings on edge:-)
Explanation:
Sarah and her bicycle have a total mass of 40 kg. Her speed at the top of a 10 m high and 100m long hill is 5 m/s. If the force of friction on her way down is 20 N, at what speed will she be going when she reaches the bottom
Answer:
She will be going at 11.01 m/s when she reaches the bottom.
Explanation:
We can find the speed at the bottom by equating the total work with the change in energy:
[tex] W = E_{f} - E_{i} [/tex] (1)
There is no energy conservation because there is a force of friction on her way down.
By entering [tex]W = -F_{\mu}*d[/tex], where [tex]F_{\mu}[/tex] is the force of friction (is negative because it is in the opposite direction of motion) and d is the displacement, into equation (1) we have:
[tex]-F_{\mu}*d = E_{f} - E_{i}[/tex]
In the initial state, we have kinetic and potential energy and in the final state, we have only kinetic energy.
[tex]-F_{\mu}*d = \frac{1}{2}mv_{f}^{2} - (\frac{1}{2}mv_{i}^{2} + mgh)[/tex]
Where:
m: is the total mass = 40 kg
[tex]v_{f}[/tex]: is the final speed =?
[tex]v_{i}[/tex]: is the intial speed = 5 m/s
g: is the gravity = 9.81 m/s²
h: is the height = 10 m
[tex] -20 N*100 m = \frac{1}{2}40 kg*v_{f}^{2} - \frac{1}{2}*40 kg*(5 m/s)^{2} - 40 kg*9.81 m/s^{2}*10 m [/tex]
By solving the above equation for [tex]v_{f}[/tex] we have:
[tex] v_{f} = 11.01 m/s [/tex]
Therefore, she will be going at 11.01 m/s when she reaches the bottom.
I hope it helps you!
find the cost of running a 60watt for 24hrs. if the electrical energy cost 5 kobo per unit
Answer:
60xtime x cost per unit
Explanation:
...
A golf club hits a 0.0459 kg golf ball at rest; the club is in contact with the ball for 0.00138 s. Afterwards the ball leaves at 63.9 m/s. How much force acted on the ball? (Unit = N)
Answer: 2120 N is correct
Explanation: correct answer for acellus
An astronomer who loved reading the Guinness Book of World Records when she was a child becomes obsessed with quasars and wants desperately to find the most distant quasar ever (the one with the largest redshift.) Where should she be looking to have the best chance of finding such a quasar
Answer: there is simply no way that she can improve her chances of finding such a quasar; such discoveries are completely random
Explanation:
A current 2a flows in a circuit fir 2 minutes. Calculate the charge generated in a circuit
Answer:
the charge generated in the circuit is 240 C.
Explanation:
Given;
current flowing in the circuit, I = 2A
time of current flow, t = 2 minutes = 2 x 60s = 120 s
The current flowing through a given circuit is defined as the quantity of charge flowing through the circuit in a given time.
[tex]I = \frac{Q}{t} \\\\Q = I t[/tex]
where;
Q is the charge flowing in the circuit
Q = 2 x 120
Q = 240 C
Therefore, the charge generated in the circuit is 240 C.
What gift is given from one generation to the next
Answer:
awareness and honesty toward others
In an electromagnet, why must the wire be connected to the battery for the magnet to work?
Answer:
Some of the copper wire needs to be exposed so that the battery can make a good electrical connection. ... You need to do this because the direction of a magnet field depends on the direction of the electric current creating it. The movement of electric charges creates a magnetic field.
Explanation:
In an electromagnet, it must the wire be connected to the battery for the magnet to work the current is flowing through into the wire once it is introduced.
What is a magnetic field?The magnetic field is defined as the field the magnetic materials generate or when an electric charge moves in a field region that generates the magnetic field.
As we know, the electricity is often used to generate a magnetic field in electromagnets.
The current is flowing through into the wire once it is introduced, from either a battery or maybe another source of electricity. The looped wire is magnetized as if it were a magnetic material as a function of the magnetic field created around it.
Thus, in an electromagnet, it must the wire be connected to the battery for the magnet to work the current is flowing through into the wire once it is introduced.
Learn more about the magnetic field here:
brainly.com/question/14848188
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Justin is riding his bike up Dunmore Hill. The effort force from his feet on his pedals is 1160N.
The resulting load force to move the bike forward is 675N. What is the mechanical advantage of
the bike?
Explanation:
the answer is 1835N that how best I can help
If an object is at rest on a compressed spring, the compressed spring contains __________.
light energy
kinetic energy
gravitational potential energy
elastic potential energy
70 POINTS
Answer:
Elastic Potential Energy
If an object is at rest on a compressed spring, the compressed spring contains elastic potential energy.
Explanation:
It's the one that stores a spring when it is compressed or stretched.
Greetings.
Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. It is observed on a screen 4.0 m behind the aperture. The width of the central maximum is 1.1 cm. What is the diameter of the hole
Answer:
The diameter of the hole is 5.6164 μm
Explanation:
Given the data in the question;
wavelength λ = 633 nm = 633 × 10⁻⁹ m
L = 4.0 M
width of the central maximum D = 1.1 cm.
Now,
Y = D / 2
Y = 1.1 / 2 = 0.55 cm
So diameter of the aperture will be;
α = 1.22λ / ( Y / L )
we substitute in our values;
α = ( 1.22 × (633 × 10⁻⁹ m)) / ( 0.55 / 4.0 )
α = 0.00000077226 / 0.1375
α = 5.6164 × 10⁻⁶ m
α = ( 5.6164 × 10⁻⁶ × 10⁶ ) μm
α = 5.6164 μm
Therefore, the diameter of the hole is 5.6164 μm
The speed of any wave depends on ...
-its angle of reflection
-its amplitude
-its energy
-the medium through which it travels
Answer:
the medium through which it travels
Explanation:
PLEASE HELP!! WILL GIVE POINTS
A machine does 9,800 joules of work to life a couch twenty meters off the ground. What is the is mass of the couch?
Answer:
49 kg is the mass of the couch.
Explanation:
GPE = mgh
9800 = m * 10 * 20
9800 = 200m
m = (9800/20) = 49 m
Thenks and mark me brainliest :))
An observer views four identical objects that are traveling at speeds close to
the speed of light. Can their lengths be used to rank the objects according to
their speeds?
Answer:
D
Explanation:
yes. The shortest object is traveling the fastest.
No,their lengths be used to rank the objects according to their speeds. Because the length of the object is depended on the frame of reference of the observer. Option A is correct.
What is frame of reference?A frame of reference is a mathematical and physical coordinate system whose origin, direction, and scale are given by a collection of reference points.
Because the length of each item is determined by the observer's frame of reference, If an observer is stationary yet traveling at near light speed, he will feel length contraction.
Otherwise, the length of the items should not alter for everyday pace.A spectator sees four identical objects flying at almost the speed of light.
No,their lengths be used to rank the objects according to their speeds. Because the length of the object is depended on the frame of reference of the observer.
Hence,option A is correct.
To learn more about the frame of reference to refer to the link;
https://brainly.com/question/12222532
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A spring with spring constant 35 N/m is attached to the ceiling, and a 5.5-cm-diameter, 1.3 kg metal cylinder is attached to its lower end. The cylinder is held so that the spring is neither stretched nor compressed, then a tank of water is placed underneath with the surface of the water just touching the bottom of the cylinder. When released, the cylinder will oscillate a few times but, damped by the water, quickly reach an equilibrium position.
Requried:
When in equilibrium, what length of the cylinder is submerged?
Answer:
Explanation:
Let length of cylinder submerged be L .
Upward force due to restoration force of spring = k L
= 35 L .
Buoyant force by water in upward direction = Vρg
V is volume of water displaced , ρ is density of water , g is acceleration due to gravity .
V = π R²L , R is radius of cylinder
V = 3.14 x (2.75 x 10⁻²)² x L
= 23.75 x 10⁻⁴ L
Buoyant force by water in upward direction =23.75 x 10⁻⁴ L X 1000 X 9.8
= 23.275L N
Total upward force = 35 L + 23.275L
= 58.275 L
For equilibrium ,
Total upward force = weight of cylinder
58.275 L = 1.3 x 9.8
L = .2186 m
= 21.86 cm
A chocolate brownie has a volume of 360cubic centimeters and a mass of 270grams. Calculate its density.
Write your answer to the hundredths place.
Answer:
Its density is 0.75 grams per cubic centimeters.Explanation:
Given that:
A chocolate brownie has a volume of 360 cubic centimeters and a mass of 270 grams.To Calculate:
Its density.We know that:
Density = Mass/VolumeWe have:
Mass = 270 gVolume = 360 ccFinding its density:
⟶ Density = 270/360
⟶ Density = 0.75
Hence,
Its density is 0.75 g/cc.What are three ways a driver can cause a car to accelerate?
A. Turn the key in the ignition while the car is stopped.
B. Turn the steering wheel while the car is moving.
C. Press the gas pedal while the car is stopped.
D. Press the brake pedal while the car is moving.
Answer:
B,C,D
Explanation:
Ap3X
3) A 30 kg child slides freely across a "Slip and Slide" on LEVEL GROUND. While the child slides, the force applied to keep them sliding is 0 N. The coefficient of kinetic friction is 0.02. What is the acceleration experienced by the child?
Answer:
a = 0.1962 m/s^2
Explanation:
The magnitude of kinetic friction exerted is given by
[tex]F_k=\mu_kN[/tex]
Where, μ_k= coefficient of kinetic friction= 0.02 and N = reaction force = mg
Where m= mass = 30 Kg and, g is acceleration due to gravity =9.81 m/s^2
F_k=0.02×30×9.81 =5.886 N
Now, since, there is no applied force this kinetic friction force will cause acceleration of the child
⇒ ma = F_k
here, a is the acceleration
⇒30a = 5.886
⇒ a = 0.1962 m/s^2
You are reading a book and decide to estimate the magnitude of the electric and magnetic fields of the light that is incident on the book from your desk lamp. You can treat the lamp as a point source that emits sinusoidal EM waves uniformly in all directions. The book is at 1 m from the 100 Watt light bulb. Assume that all the electric energy is transformed into visible light.
(Part a) Calculate I, the intensity of the light incident on your book?
(Part b) Find Eo and Bo, the amplitude of the electric and the magnetic fields of the EM waves emitted by the lamp.
Answer:
a. 7.96 W/m² b. i. 0.205 V/m ii. 0.68 nT
Explanation:
(Part a) Calculate I, the intensity of the light incident on your book?
Intensity, I = Power, P/Area,A
I = P/A where P = 100 W and A = 4πr² where r = distance of source from book = 1 m.
So, I = P/A
= 100 W/4π(1 m)²
= 25/π W/m²
= 7.96 W/m²
(Part b) Find Eo and Bo, the amplitude of the electric and the magnetic fields of the EM waves emitted by the lamp.
i. Eo the amplitude of the electric field
Intensity, I = E²/cμ₀ where E = r.m.s value of electric field, c = speed of light = 3 × 10⁸ m/s and μ₀ = permeability of free space = 4π × 10⁻⁷ H/m
Thus, E = √(I/cμ₀)
substituting the values of the variables into the equation, we have
E = √(I/cμ₀)
E = √(7.96 W/m²/[3 × 10⁸ m/s × 4π × 10⁻⁷ H/m])
E = √(7.96 W/m²/120π H/s)
E = √(0.0211 Ws/Hm²)
E = 0.145 V/m
Now E = E₀/√2 where E₀ = maximum value of electric field
So, E₀ = √2E
= √2 × 0.145 V/m
= 0.205 V/m
ii. Bo the amplitude of the magnetic field
Since c = E₀/B₀ where c = speed of light = 3 × 10⁸ m/s
B₀ = E₀/c
= 0.205 V/m ÷ 3 × 10⁸ m/s
= 0.068 × 10⁻⁸ T
= 0.68 × 10⁻⁹ T
= 0.68 nT
The Lemon Experiment is a breathing technique.
A) True
B) False
Answer:
b ❤❤❤❤❤❤❤❤❤ yes
Explanation:
yes b❤❤❤❤❤❤❤❤❤❤❤
Answer:
False
Explanation: