Explanation:
velocity = wavelength × frequency
3×10⁸ = 400/10⁹ × frequency
frequency = 3 × 10¹⁵ /400
frequency = 75×10¹¹Hz
For the summer 5th grade trip, the students
traveled for 90 miles. The trip took 3 hours. What
was the buses' average speed?
Answer:
30 miles/hour
Explanation:
Bus traveled 90 miles and took 3 hours if you take the average per hour it should be around, 30 miles every hour
Fossils are remains of organisms found in sedimentary rock. These remains are found in thousands of rock layers around the world and provide evidence for Earth's long history of changing lifeforms.
Rock layers that formed more recently
Answer:
metamorphic rocks
Explanation:
I hope this helps you, I'm sorry if it's wrong!
If it's right please don't forget to mark me as brainliest!
Answer:
the top layers
Explanation:
sedimentary layers are deposited on top of each other over time
If a 370 KG missile is flying at a speed of 220 m/s , then what is it’s kinetic energy
Answer:
8954000 J
Explanation:
The formula to find kinetic energy is:
Kinetic energy = [tex]\frac{1}{2}[/tex] × mass × (velocity)²
So, Kinetic energy = [tex]\frac{1}{2}[/tex] × 370 × (220)²
Kinetic energy = 8954000 J
Please answer this I need help
How much work would I do if I pushed an object with a force of 64 a distance of 11 m
Answer:
Work=Force×distance
Explanation:
work=force×distance
force=64N
distance=11m
work=64×11=704Joules
Remember unit of work is Joules or Newton metre(N/m).
Why is fair play essential in sports?
Answer: Fair play, which is an essential and central part of successful involvement, promotion and development in both sport and life, can teach people tolerance and respect for others.
Explanation:
It allows them to integrate into society and create a sense of teamwork.
If a neighbor pushes a lawnmower six times as far as you do but exerts only one third the force, which one of you does more work and by how much?
Answer:
Your neighbor does twice as much work.
Explanation:
Distance(measurement) * exertion(force of pushing mower) = work
6 * 1/3 = 2
Your neighbor does twice as much work as you do.
The current through a wire that is (1.8×10-2 m) long is (3.2 A). The wire is
perpendicular to a (7.5×10-2 T) magnetic field. What is the magnitude of the magnetic
force on the wire?
4.3×10 −3 N
5.8×10 −2 N
1.4×10 −3 N
2.4×10 −2 N
The magnitude of the magnetic force on the wire is determined as 4.32 x 10⁻³ N.
Magnetic force on the wireThe magnitude of magnetic force on the wire is calculated as follows;
F = BIL x sinθ
where;
B is magnetic field
I is currentL is length of the wireθ is angle of inclinationF = (7.5 x 10⁻²) x (3.2) x (1.8 x 10⁻²) x sin(90)
F = 4.32 x 10⁻³ N
Thus, the magnitude of the magnetic force on the wire is determined as 4.32 x 10⁻³ N.
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true or false a solution containing 5 moles of solute per kilogram of solvent is said to he a 5 M concentrated solution
Answer:
False
that should be 5m
Explanation:
Moles of solute=5molMass of solvent in kg=1kgSo
Molality=5/1Molality=5mWhat is the energy required to start a chemical reaction called
Conducting an experiment without a theory, assumptions, or expectations can lead to what issue?
Answer:
When accounting for threats to validity in their study design, researchers must make assumptions about their environment. If any of these assumptions prove to be false, then it is more difficult to properly interpret the results of the experiment.
Explanation:
the 20 kg wheel has a radius of gyration about its center G of kG = 300 mm. When it is subjected to a couple moment of M = 50 N # m, it rolls without slipping. Determine the angular velocity of the wheel after its mass center G has traveled through a distance of sG = 20 m, starting from rests.
The angular velocity of the wheel after its mass center G has traveled through a distance starting from rests is 31.62 m.
What is angular velocity?The velocity of an object when moving on a circular track.
The moment of inertia of the wheel about the center O is
I = mk²
Where radius of gyration k= 300mm =0.3 m and mass of wheel m =30kg
I = 20 x (0.3)² = 1.8 kg.m²
The final kinetic energy of wheel is
K.Ef = 1/2 x mx (rω²) + 1/2 x I x ω²
Substitute the values from the question, we have
K.Ef = 1/2 x 20 x (0.4 x ω²) +1/2 x 1.8 x ω² =2.5ω²
The initial kinetic energy is zero, K.Ei =0
According to the work energy theorem, W =K.Ef -K.Ei =2.5ω² ...............(1)
Work done = moment x angular displacement
W = 50 N.m x 20m/0.4m = 2500 N.m............(2)
Equating both the equations and solving for ω, we get
ω =31.62 rad
Thus, the angular velocity is 31.62 rad.
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two lenses are combined together . if the power of one of the lenses is +5D and combined focal length is 0.4m.What is the power of the second lens
Answer:
-0.4D(maybe)
Explanation:
combined focal length (f)= 0.4m
D1 = 5D
Then f1= 1/D1
= 1/5 = 0.2 m
1/f=1/f1+1/f2
1/0.4=1/0.2+1/f2
f2= -5/2
D2=1/f2= -0.4D
A proton travels at a velocity of 3.0x106 m/s in a direction perpendicular to a uniform magnetic field.
A proton entering a magnetic field
If the proton experiences a magnetic force of 1.15x10-13 N, what is the magnitude of the magnetic field?
Hi there!
Recall the equation for magnetic force on a moving particle.
[tex]F_B = qv \times B[/tex]
[tex]F_B[/tex] = Magnetic Force (N)
q = Charge of particle (C)
v = Velocity of particle (m/s)
B = Magnetic Field Strength (T)
**This is a cross product, so the equation can be written as [tex]F_B[/tex] = qvBsinφ where φ is the angle between the velocity vector and magnetic field vector.
Since the proton is traveling perpendicular to the field, we can disregard the cross product. (sin90 = 1.)
Rearrange the equation to solve for 'B':
[tex]B = \frac{F_B}{qv}\\\\B = \frac{1.15 * 10^{-13}}{(1.6 * 10^{-19})(3.0 * 10^6)} = \boxed{0.24 T}[/tex]
How does carbon dioxide behave as a greenhouse gas?
Answer:
Carbon Dioxide is supposed to block out radiation and is can be used in plant to make material, include cement,plastic,and rubber. However, since carbon dioxide is a greenhouse gas, it warms the Earth,and causes the climate to change.
(Hope This Helps <3)
What happens to the interference fringes if coherent sources is replaced by the headlight of
vehicles?
Answer:
headlight of vehicles use less energy and gives light to very limited area hence electricity can be conserved by doing this
what force is required to move 7m if the work done is 9j
Answer:
Work = force x displacement
Force = W/s = 9/7 = 1.28 N
Navigation is the art of measuring distances in order to be able to __________.
Navigation is the art of measuring distances in order to be able to get from one place to another
use scale drawing vector and find magnitude and direction of Sum of A+B
The magnitude of the sum of the two vectors is 20.22 m and the direction of the two vectors, A + B is 50⁰.
Magnitude of Sum of vector A+BThe magnitude of the sum of the two vectors is calculated as follows;
Bx = Bcosθ
By = Bsinθ
Bx = 15 m x cos(30) = 12.99 m
By = 15 x sin(30) = 7.5 m
Ax = 8 m x cos(90) = 0 m
Ay = 8 x sin(90) = 8 m
Ax + Bx = 0 + 12.99 m = 12.99 m
Ay + By = 8m + 7.5 m = 15.5 m
R = √12.99² + 15.5²
R = 20.22 m
Direction of the vectorstanθ = 15.5/12.99
tanθ = 1.19
θ = 50⁰
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In a skate park, you are trying to determine how to get the most speed at the bottom of the ramp. If the ramp is 4.5 m high, and you start at the top of the ramp with an initial velocity of 1.5m/s, how fast will you be rolling at the bottom of the ramp, given there is no friction. Use conservation of energy to solve.
Answer:
If you have an initial velocity of 1.5m/s and the ramp height is 4.5, and an extreme fart is initiated at the bottom of the ramp exerting an didditional upward force, and the smell of the fart causes you to begin flailing, and everyone running from you causes an additional wind force, then you would be rolling at a speed of 3 m/s given there is no friction. :)
State the conditionsfor tge equilibrium of a body which is acted upon by a number of forces
Show work for either one thanks
The maximum velocity of the pendulum is determined as 3.03 m/s.
Maximum velocity of the pendulum
The maximum velocity of the pendulum is calculated from the principle of conservation of energy as shown below;
K.E = P.E
¹/₂mv² = mgh
v² = 2gh
v = √2gh
where;
h is the maximum height = 0.468 mv is the maximum velocityv = √(2 x 9.8 x 0.468)
v = 3.03 m/s
Thus, the maximum velocity of the pendulum is determined as 3.03 m/s.
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it is possible for an object to maintain constant velocity when only one non-zero force acts on the object. True or false? Explain.
it is possible for an object to maintain constant velocity when three non-zero act on the object. True or false? Explain
Answer:
false
Explanation:
False - For an object to maintain a constant velocity, 0 Newtons of net force (i.e., a balance of forces) is required. i. True - Unbalanced forces cause stationary objects to accelerate from rest. In the absence of an unbalanced force, a stationary object would remain at rest.
Explain why the water that is used to cool the reactor vessel of a nuclear power plant is kept separate from the water that is heated to produce steam for the turbine generators.
Explanation:
Reasons:
- to separate and
- to avoid formation of electricity.
Use the following d/t graph to determine the velocity of the object
Answer:
1/3 m/s
Explanation:
Because the graph goes from 3 to 8 on the Y axis we know that each line is 0.5 and on the X axis each line is 1, Then, the slope , or velocity, is 1/3
see? This graph is kinda set up to throw you.
Is there a 1/3 option for this ??
What is the initial vertical velocity?
Answer:
Thus, any projectile that has an initial vertical velocity of 21.2 m/s and lands 10.0 m below its starting altitude spends 3.79 s in the air.The initial vertical velocity is the vertical component of the initial velocity: v 0 y = v 0 sin θ 0 = ( 30.0 m / s ) sin 45 ° = 21.2 m / s .
The resistance of a wire of length 100cm and diameter 0.3m is found to be 30 ohm's.calculate:(1) resistivity (2) conductivity (3) what length of the wire will produce 5 ohm's resistance.
Hi there!
1)
We can use the following equation to solve for resistivity.
[tex]R = \frac{\rho L}{A}[/tex]
R = Resistance (30 Ω)
ρ = Resistivity (? Ωm)
L = Length (100cm = 1 m)
A = Cross-sectional area of wire (r = 0.15m, A = πr², A = 0.0707 m²)
Rearrange the equation to solve for resistivity.
[tex]\rho = \frac{RA}{L}\\\\\rho = \frac{30 * 0.0707}{1} = \boxed{2.121 \Omega m}[/tex]
2)
The conductivity of a resistor is equivalent to:
[tex]\sigma = \frac{1}{\rho}[/tex]
σ = Conductivity (S/m)
ρ = Resistivity (2.121 Ωm)
Solve:
[tex]\sigma = \frac{1}{2.121} =\boxed{0.472 \frac{S}{m}}[/tex]
3)
We can use the equation for resistivity to solve. Rearrange the equation for length:
[tex]R = \frac{\rho L}{A}\\\\L = \frac{AR}{\rho}\\\\L = \frac{0.0707 * 5}{2.121} = \boxed{0.167 m}[/tex]
The driver of a car moving with a constant speed applies the breaks, and the car comes to a stop after traveling 3.5 meters. Which force causes the deceleration of the car?
Answer:
Friction is the resistive force. when a driver applies brakes, the wheels stop rotating and there is friction between the tyres and the rough surface of the road. (but if you ask why it moves 3.5 m after braking, that is due to the intertia of the moving car)
PLSS HELP AND I WILL GIVE BRAINLY TO THE ONE WHO ANSWERS CORRECTLY
60 J of work is needed to move a charge of 5 C through a wire.
1. What potential difference will do this work?
2. What is the electric current if this charge moves through a wire over time of 1.25 seconds?
3. How long will it take to move 60 C of charge?
4. What is the resistance in the circuit?
5. If the resistance doubles, what will be the new electric current?
The potential difference,electric current ,resistance and new electric current will be 12 V,4 A,3 Ω,2 A.
What is resistance?Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
The energy in terms of the charge and potential difference is;
E= qV
60=5 C × V
V= 12 V
The electric current is found as;
[tex]\rm I= \frac{q}{t} \\\\ I= \frac{5}{1.25}\\\\ I=4 \ A[/tex]
From the ohm's law;
V=IR
12=4 ×R
R=3Ω
If the voltage is constant and the resistance is doubled, then the new electric current is half of the previous condition;
[tex]\rm I'=\frac{I}{2} \\\\ I'=\frac{4}{2} \\\\\ I'=2 \ A[/tex]
Hence, the potential difference,electric current ,resistance and new electric current will be 12 V,4 A,3 Ω,2 A.
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For the question below which equation should be used?
Answer:
Equation 2
Explanation:
Initial velocity ( Vo ) = 20 m/s
Acceleration ( a ) = 1.1 m/s^2
Distance ( d ) = 55 m
Final velocity ( Vi ) can be found using equation 2
