What is an electromagnetic wave?
A. An induced electric current
B. Vibrating electric and magnetic fields
C. Oscillating electric current
D. An electromagnet
Answer: B
Explanation:
What force acts on an object in free fall?
Answer:
gravitational force. in my view but m not sure
is the force that opposes the motion and therefore, tries to stop
or slow down a moving body.
e fuole
Answer:
Friction is the force between an object in motion and the surface on which it moves. Friction is the external force that acts on objects and causes them to slow down when no other external force acts upon them. Inertia is the tendency of a body in motion to remain in motion.
Answer:
Explanation:
Friction is the drive between an object in motion and the surface on which it moves. Friction is the outside constrain that acts on objects and causes them to moderate down when no other outside drive acts upon them.
An object with a mass of 5 kilograms starts from rest and achieves a maximum speed of 10 meters per second in 0.5 seconds. What average unbalanced force on this object?
a. 50 N
b. 100 N
c. 10 N
d. 1000 N
Answer:
I think 1000 N............
Here is the parallelogram rule in the file attached... Can someone please explain why the resultant force of these 2 vectors (30 N and 40 N) is 60 N? I know it's with an angle at 26ºC to the horizontal, so it wouldn't be 50 N. So how do you find this? How do you calculate the vectors when they are not straight lines shown. If someone is using this for an advantage of points, I'll report you. Thanks in advance :)
9514 1404 393
Answer:
sum the components, orsolve the triangleExplanation:
The most straightforward way to compute the resultant of two vectors is to add their x- and y- components. In the attached, we have labeled the 30 N force "B" and the 40 N force "A". Their respective (x, y) components are ...
A = 40(cos(0°), sin(0°)) = (40, 0)
B = 30(cos(62.72°), sin(62.72°)) = (13.75, 26.66)
Then the components of the resultant are ...
R = A + B = (40, 0) +(13.75, 26.66) = (53.75, 26.66)
Its magnitude is found from the Pythagorean theorem:
|R| = √(53.75² +26.66²) = 60.00
Its direction is found from the components using the arctangent function:
∠R = arctan(26.66/53.75) = 26.38°
In a sort of shorthand notation, ...
R = 60.0∠26.4°
__
Alternate solution
In order to perform the above calculation, you need to know the angle between the vectors. The other angle in the parallelogram is the supplement of this. So, you can find the resultant by solving the triangle OAR, where O is the origin. Angle A in that triangle will be 180° -62.72° = 117.28°. This gives you enough information to use the Law of Cosines.
OR² = OA² +AR² -2(OA)(AR)cos(A)
OR² = 40² +30² -2·40·30·cos(117.28°) ≈ 3600.0
|R| = √3600 = 60
Then you can find the angle AOR using the law of sines.
sin(AOR)/30 = sin(117.28°)/60
∠AOR = arcsin(sin(117.28°)/2) = 26.38°
So, you now know ...
R = 60.0∠26.4°
A permanent magnet picks up an iron nail, magnetizing the nail. How is this system different from an electromagnet?
Answer:the nail is magnetized by a permanent magnet instead of by a solenoid with an electric current running through it
Explanation:
The permanent magnet magnetizing the nail will differently function like electromagnet, by utilizing the electric current through the iron. Hence, option (B) is correct.
The given problem is based on the concept and fundamentals of magnetization. The term magnetizations means that the density of magnetic dipole moments induced in a magnetic material, when it is placed near a permanent magnet.
In the given problem, the magnetization of iron nail takes place by passing the current through the nail.The electric current utilize the electric charge which responds the electric field. When the current carrying nail is placed beside the permanent magnet, the dipole set up and it will create a polarity for which the nail will now itself behave as a magnet.Thus, we can conclude that the permanent magnet magnetizing the nail will differently function like electromagnet, by utilizing the electric current through the iron. Hence, option (B) is correct.
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A robin flies a distance of 45963 cm. How far has it flown in kilometers?
Answer:
0.46km
Explanation:
45963cm/100cm=459.63m/1000m=0.45963 or 0.46km
Will give
Creep meters and laser-ranging devices measure horizontal fault movement.
Please select the best answer from the choices provided
T
F
Answer:
True
Explanation:
Answer:
True.
Explanation:
Hope this helps!!! <3
kinetic energetic plus potential energy is called
PLEASE HELP!!!!!!!!
Answer:
the is D
Explanation:
An action-reaction force pair
Answer:
An action-reaction force pair
Determine the gain in the potential energy when a 8.0 kg box is raised 17.2 m.
Answer:
The answer is 1376 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 10 m/s²
From the question we have
PE = 8 × 10 × 17.2
We have the final answer as
1376 JHope this helps you
Explanation:
potential energy = mgh
potential energy = 8 * 10 * 17.2
potential energy = 1376 joules
if you walk at an avaerage speed of 5 km/h for 30 min how far will you walk
Answer:
2.5 km/30min
Explanation:
Divide 5 by 2 because 30 min is half of 1 hour. when you do that you get 2.5
A motor with a resistance of 320 is connected to a voltage source. Four amps of current flows
in the circuit. What is the voltage of the source?
I
Answer:
V = 1280 [V]
Explanation:
To solve this problem we must use ohm's law which tells us that the voltage is equal to the product of the resistance by the current.
Therefore we have:
V = I*R
where:
V = voltage [V] (Units of volts)
I = current = 4 [amp]
R = resistance = 320 [ohms]
V = 4*320
V = 1280 [V]
How does the observed pitch of the buzzer change as it moves
observer?
pitch of the buzzer increased (higher tone) as it moves towards the observer
The pitch of the buzzer decreased (lower tone) as it moves towards the observer
The pitch of the buzzer stayed the same no matter where it was in relationship
to the observer
The answer is
Pitch of the buzzer increased (higher tone) as it moves towards the observer
The correct option that explains the change in the observed pitch of the buzzer as it moves towards the observer is;
A; pitch of the buzzer increased (higher tone) as it moves towards the observer
This is based on the concept of doppler effect which is defined as the change in frequency/pitch of a sound that is heard by an observer due to the fact that the sound source and the observer have different velocities with respect to the medium through the sound travels.Now, according to doppler effect, when the source of the sound moves towards the observer, the frequency will increase due to the fact that the time between successive sound waves is shortened. Thus, this means that the pitch will be higher. However, when the sound source moves away from the observer, the frequency would decrease due to the fact that the time between successive sound waves or the crest is now longer. Thus, the pitch will decrease.In conclusion, the pitch of the buzzer will increase as it moves towards the observer.
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What is the formula of Acceleration for mass and time
Answer:
a = m/t²
Explanation:
The Formula of Acceleration for mass and time
a = m/t²
where,
m = meter
t = time in (seconds)
The SI unit of acceleration is m/s² or ms⁻²
-TheUnknownScientist
When sand absorbs the electromagnetic waves of the Sun, it becomes warm through the process of______.
radiation
conduction
convection
evaporation
radiation
i know because i know
What is the net force on this box?
Answer:
I believe 0
Explanation:
this is due to the fact that the box will not move anywhere the forces are canceling themselves out.
You throw an orange out a window at a height of 12.00 meters
upwards at an angle of 32° to the horizontal at a velocity of 3.5
m/s. What is the maximum height that the orange will reach?
Answer:
12.18
Explanation:
The maximum height that the orange will reach is 12.18 m.
What is projectile?When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion.
You throw an orange out a window at a height of 12.00 meters upwards at an angle of 32° to the horizontal at a velocity of 3.5 m/s.
If u is the initial speed, the maximum height of the ball from the point of throwing is
H = u² sin²θ / 2g
Put the values, we get
H = 3.5² sin²32° / (2x9.81)
H = 0.1753 m
So, the maximum height calculated from the ground is
12 + 0.18 = 12.18 m
Thus ,the maximum height that the orange will reach is 12.18 m.
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Which of the following is the best example of positive peer pressure?
Answer:
1.Your friend says "no thanks" to the dinner your dad cooked and prefers to just hang out with friends instead.
2. Your teammates keep making fun of you for spending so much time studying for Friday's math test.
3. Your coworkers spend every weekend watching movies at Tim's house and invite you to join them.
4. Your friends all sign up for a free class at the gym and suggest you sign up for it, too.
i would appreciate it if u would answer
Answer:
A) Kinetic energy and gravitational energy
Explanation:
The blimp has kinetic energy, because it is moving. When it circles the event, it gains and uses kinetic energy. It also has potential energy because it has the potential to go a lot faster, and because it has so much stored energy and pressure.
Hope this helps!
define frequency in terms of a wave
Answer:
Explanation:
For a wave, the speed is the distance traveled by a given point on the wave (such as a crest) in a given period of time. So while wave frequency refers to the number of cycles occurring per second, wave speed refers to the meters traveled per second
ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.
In working this problem, assume the value of "g" to be 9.8 m/s2 with two (2) significant digits unless otherwise stated.
Given that a lever has a mechanical advantage of 6.0 and is 100% efficient, if the resistance is to be lifted 2.0 inches, then how far must the effort move?
De = _____ in.
12
8.0
4.0
3.0
NEXT
The effort must move 8•0
Select the correct answer.
Which statement about pneumatic systems is true?
A.
Pneumatic systems generate greater force than hydraulic systems.
B.
Pneumatic systems are safe to use at any level of pressure.
C.
Pneumatic systems are more expensive than hydraulic systems.
D.
Pneumatic systems are cleaner than hydraulic systems.
Statement D about pneumatic systems is true. Pneumatic systems are cleaner than hydraulic systems.
What is the pneumatic system?Pneumatic systems are employed in a wide range of manufacturing and assembly applications. They can be used to transport objects on production lines as well as in maintenance facilities.
In hydraulic systems liquid is used as fluid for the force transmission. While in the pneumatic system air is used causing more cleanliness in the system.
The pneumatic systems are cleaner than hydraulic systems.
Hence, a statement D about pneumatic systems is true.
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PLS HELP ITS WORTH SO MANY POINTS AHH
LONGITUDINAL
SURFACE
TRANSVERSE
HEAT
Answer:
C. transverse
What is another name for an alpha particle? Include the atomic number and mass number
Answer:
Alpha particles are Helium nuclei consisting of 2 protons and two neutrons (mass number 4, atomic number 2, no electrons and so carry a 2+ charge).
Explanation:
Find the range of a projectile launched at an angle of 30° with an initial velocity of 20m/s.
Answer:
The range is 35.35 m
Explanation:
Projectile Motion
It's the type of motion that experiences an object projected near the Earth's surface and moves along a curved path exclusively under the action of gravity.
Being vo the initial speed of the object, θ the initial launch angle, and [tex]g=9.8m/s^2[/tex] the acceleration of gravity, then the maximum horizontal distance traveled by the object (also called Range) is:
[tex]\displaystyle d={\frac {v_o^{2}\sin(2\theta )}{g}}[/tex]
The projectile was launched at an angle of θ=30° with an initial speed vo=20 m/s. Calculating the range:
[tex]\displaystyle d={\frac {20^{2}\sin(2\cdot 30^\circ )}{9.8}}[/tex]
[tex]\displaystyle d={\frac {400\sin(60^\circ )}{9.8}}[/tex]
[tex]d=35.35\ m[/tex]
The range is 35.35 m
There is a ball at rest on a flat floor. What kind of equilibrium is it in? *
Stable Equilibrium
Unstable Equilibrium
Neutral Equlibirum
Not in Equilibrium
100 PTS!!! PLEASE HELP!
I need this 6 questions done!
Answer:
don t know
Explanation:
Why does the lens need to be thicker for viewing nearby objects?
Answer: To focus on a near object – the lens becomes thicker, this allows the light rays to refract (bend) more strongly. To focus on a distant object – the lens is pulled thin, this allows the light rays to refract slightly.
Explanation:
A diver runs horizontally off the end of a diving board with an initial speed of 1.95 m/s. If the diving board is 2.00 m above the water, what is the diver's speed just before she enters the water
Answer:
V = 6.56 m/s
Explanation:
in order to find the speed of the diver before she enters we need to find the vertical component of its final velocity by using 3rd equation of motion:
2gh = Vy² - V₀y²
where,
g = 9.8 m/s²
h = height = 2 m
Vy = Vertical Component of Final Velocity = ?
V₀y = Vertical Component of Initial Velocity = 0 m/s
Therefore,
2(9.8 m/s²)(2 m) = Vy² - (0 m/s)²
Vy = √39.2 m²/s²
Vy = 6.26 m/s
Assuming negligible air friction, the x-component of the final velocity will be the same as the initial velocity:
Vₓ = V₀ₓ = 1.95 m/s
Hence, the final velocity will be:
V = √(Vₓ² + Vy²)
V = √[(1.95 m/s)² + (6.26 m/s)²]
V = 6.56 m/s