one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Lifting a heavy piano in the air 30
feet to a second story room would
be the easiest by doing which of
the following actions?
A. jumping up 30 feet with the piano on your
back
B. carrying the piano up a ladder that is very
steep
C. carrying the piano up a long staircase with
many steps spread apart
IMA = inclined mechanical advantage = distance (L) : height (h)
the longer the track / distance the easier we lift it
C. carrying the piano up a long staircase with many steps spread apart
A figure skater goes into a spin with her arms outstretched. She then pulls her arms in against her body. If she is initially rotating at 2rev / s , what is her final rotational speed? Assume that by pulling in her arms she reduces her rotational inertia from 2kg - m ^ 2 to 1.5kg - m ^ 2
For a figure skater goes into a spin with her arms outstretched. She then pulls her arms against her body. If she is initially rotating at 2rev / s is mathematically given as
Wf= 6rev / s
what is her final rotational speed?
Generally, the equation for the conservation angular momentum is mathematically given as
I1Wf=I2Wf
2kg - m ^ 2 X 2rev / s = 1.5kg - m ^ 2 X W2
Wf= 2/1.5(2)
Wf= 6rev / s
In conclusion, her final rotational speed is
Wf= 6rev / s
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A wave created by shaking a rope up and down is called a.
A uniform metal bar 100cm long balances at 20cm mark when a mass of 1.5kg is attached at 0cm mark calculate the weight of the bar (take g=10n/kg)
Answer:
1.6 ml
Explanation:
If the voltage of a circuit is doubled and the resistance remains unchanged, the current flowing through the circuit will be
If the voltage of a circuit is doubled and the resistance remains unchanged, then current flowing through the circuit: will Increase
Relationship between Current, Voltage and Resistance
The Current of a circuit is directly proportional to the voltage and inversely proportional to the resistance.
The voltage in a circuit is equal to the product of the current and the resistance in the circuit
The resistance in a circuit is directly proportional to the voltage but inversely proportional to the current.
In conclusion, If the voltage of a circuit is doubled and the resistance remains unchanged, then current flowing through the circuit: will Increase
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A 30 kg falling object hits the ground at a speed of 11.5 m/s. If the kinetic energy of the object when it hits the ground is equal to the gravitational potential energy it had before it was dropped, at what height was it dropped from?
Answer:
6.74 m
Explanation:
PE = KE
mgh = 1/2 mv^2
30 ( 9.81) h = 1/2 (30)(11.5)^2
h = 6.74 m
How is area different from volume
Answer:
Area is two dimensional like cm^2 volume is 3 dimensional like cm^3
Explanation:
Answer:
an area is a two dimensional whereas a volume is a three dimensional
Explanation:
An area is a plain figure while a volume is a solid figure.The area is measured in square units and the volume in cubic units.The area covers the outer space and the volume the inner capacity
A water wave approaches a wall with a small hole in it. The wave is blocked by the wall, except for the part that goes through the hole. The waves coming out of the hole begin to spread out as the new source of wavefronts. This is an example of what property?
a Interference
b Amplitude
c Collision
d Diffraction
Answer:
diffraction
Explanation:
took da test
A nonconducting sphere of radius r0 carries a total charge q distributed uniformly throughout its volume
The electric field for the nonconducting sphere of radius r₀ carries a total charge q distributed uniformly throughout its volume will be,[tex]E=kQ\frac{r}{r_0^3}[/tex].
What is an electric field?It is a physical field occupied by a charged particle on another particle in its surrounding.
For a non-conducting sphere, the charge density is;
[tex]\rm \rho = \frac{q}{V} \\\\ \rho = \frac{Q}{\frac{4}{3}\pi r^3 } \\\\ \rho = \frac{3Q}{4 \pi r_0^3} \\\\[/tex]
The electric field is found as;
[tex]\rm E=K \frac{\rho V}{r^2} \\\\ E= k \frac{3Q \times 4 \pi r^3}{4 \pi r_0^3 \times 3r^2} \\\\ E=kQ\frac{r}{r_0^3}[/tex]
Hence, the electric field for the nonconducting sphere of radius r₀ carries a total charge q distributed uniformly throughout its volume will be,[tex]E=kQ\frac{r}{r_0^3}[/tex].
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What type canola oil biome is
Answer:
canola oil biome is a chemically refined oil that is used for cooking and skin
Explanation:
What is the answer:
in the setup shown, a student pulls a string attached to a block with a force of F, The string applies a force with a magnitude of 21.1N on the block in the upward direction. the block has a weight of 19.6N.
A. 1.5N in the upward direction
B. 40.7N in the upward direction
C. 1.5N in the downward direction
D. 40.7 N in the downward direction
The magnitude and direction of the normal force will be 1.5N in the upward direction. Option A is correct.
What is tension force?The tension force is described as the force transferred through a rope, string, or wire as it is pulled by opposing forces.
The tension force is applied along the whole length of the wire, pulling energy equally on both ends.
The magnitude and direction of the normal force is found as;
[tex]\rm F_{net}=F_1-F_2 \\\\ \rm F_{net}=N\\\\ N=21.1 \ N - 19.6 \ N \\\\ N=1.5 \ N[/tex]
The grater force is in the upward direction. The magnitude and direction of the normal force will be 1.5N in the upward direction.
Hence,option A is correct.
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Answer:
1.5 N in the upward direction.
Explanation:
Let f(x) = -log(4x) + 5.
What is the average rate of change of f(x) from 3 to 8?
Round your answer to the nearest hundredth.
0-11.74
-0.09
0
0.09
O 11.74
Answer:
0.09
Explanation:
I took the test and the correct answer is actually
-0.09
True or false the incident angle is the angle formed between the barrier and the direction of wave propagation?
It is true that the incident angle is the angle formed between the barrier and the direction of wave propagation.
What is wave propagation?Wave propagation refer to the processes and different ways waves travels from one medium to another and transferring energy.
Therefore, is true that the incident angle is the angle formed between the barrier and the direction of wave propagation.
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A meter stick hurtles through space at a speed of 0. 95c relative to you, with its length perpendicular to the direction of motion. You measure its length to be equal to.
Answer:
Explanation:
Caty , Use the relativity formula for length. ( they teach this in H.S. ? ) it's from my Modern Physics in college, A 300 level class
L = [tex]L_{0}[/tex][tex]\sqrt{1-\frac{v^{2} }{c^{2} } }[/tex]
L = 3 [tex]\sqrt{1-\frac{.95^{2} }{1^{2} } }[/tex]
L = 0.9367496998 meters
L = 0.94 meters approx
Question 25 of 25
How do changes in light wavelengths support the most widely accepted
ideas about the universe?
O A. Galaxies are moving away from Earth, as shown by the shift of
their light toward the red end of the spectrum.
B. Galaxies are moving toward Earth, as shown by the shift of their
light toward the blue end of the spectrum.
OC. Galaxies are moving away from Earth, as shown by the shift of
their light toward the blue end of the spectrum.
OD. Galaxies are moving toward Earth, as shown by the shift of their
light toward the red end of the spectrum.
The changes in light wavelengths support the most widely accepted
ideas about the universe is Light from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from Earth. The correct option is A.
Universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, the stars along with the ,dust , gases, rocks forms the universe.
As the universe is expanding more and more, the galaxies are shifting their way apart.
According to Doppler's Effect, wavelength and frequency of a wave will changes with respect to an observer If the observer moves closer, the spectrum will shift towards blue end and if it moves away, the spectrum will shift towards the red end.
When spectrums of distant galaxies were observed to be shifting towards red light, also known as Red shifting. This shows that the Big Bang theory is true that universe is expanding.
Thus, the correct option is A.
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A grasshopper jumps at a 65.0° angle at 5.42 m/s. At what time does it reach its maximum height? (Unit = s)
Answer:
Vy = V sin θ = 5.42 m/s * .907 = 4.91 m/s initial vertical speed
Vy = a t = 0 at time it reaches maximum height
t = 4.91 m/s / 9.80 m/s^2 = .501 time to reach maximum height
Is cracking the eggs a physical change or a chemical change and why
Answer:
Cracking of an egg is a physical change since the egg and the stuff inside does not change but the shape or appearance of the shell changes.
Explanation:
Hope it helps
The basic unit of electric current is the: ohm. ampere. conductivity. volt.
The basic unit of the measure of the rate of current flow in a conductor is ampere.
Option B) ampere is the correct answer.
What is Current?Current is simply the rate of flow of charged particles such as electrons caused by:
EMF or Voltage.An ampere is simply a unit of measure of the rate of current flowing through a conductor.
Ampere is the SI basic unit of electric current
Therefore, the basic unit of the measure of the rate of current flow in a conductor is ampere.
Option B) ampere is the correct answer.
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Answer:
B) ampere
Explanation:
The boom hoisting sheave must have pitch diameters of no less than.
Answer:
18 times
Explanation:
All sheaves used in the boom hoist reeving system must have a rope pitch diameter of not less than 18 times the nominal diameter of the rope used. The operating design factor for the boom hoist reeving system must be not less than five.
A neutron star is as dense as Group of answer choices water the nucleus of an atom the center of the Earth our astronomy textbook a white dwarf star
A neutron star is considered as dense as the nucleus of an atom, and it represents a special type of star.
What is a neutron star?A neutron star is a special kind of star generated after the death of a giant star that produces a supernova.
These stars (neutron stars) have a diameter really small, e.g., an area of ten kilometers in diameter.
In conclusion, a neutron star is as dense as the nucleus of an atom, and it represents a special type of star.
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which of these is NOT an example of a lever?
a. shovel
b. pushup
c. ramp
d. seesaw
Answer:
c
Explanation:
Out of the given options, shovel, pushup, and seesaw are all examples of levers. Hence, the one that is not an example is :
rampWhich formulas show the relationships between momentum, mass, and velocity? check all that apply. p = mv p = mass over volume p = volume over mass m = density over volume p = volume over density v = density over mass v = mass over density
The relationships between momentum, mass, and velocity is that the product of mass and velocity gives the momentum of that object ( kg.m/s ).
P = mv.
What is Momentum?Momentum is simply the product of the mass of an object and its velocity.
Its is expressed as;
P = m × v
Where m is the mass of the object and v is its velocity.
The relationships between momentum, mass, and velocity is that the product of mass and velocity gives the momentum of that object ( kg.m/s ).
P = mv
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Answer:(C)
Explanation:
because is 13 trust me I got it right
What type of energy change results when friction slows down an object.
Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to _____. Assume there are about 100 billion stars in the Milky Way galaxy.
It has been proposed that the total number of civilizations that have arisen in our galaxy would be closest to 100,000.
What is a galaxy?A galaxy is a group of stars (solar systems), gas, and dust in a specific position in the Universe.
The Milky Way is the galaxy where we live and it has been proposed that this galaxy is full of dead civilizations.
In conclusion, the total number of civilizations that have arisen in our galaxy would be closest to 100,000.
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Please help me with theses questions ASAP.
Select the correct answer.
1. Which feature indicates that Mars resides in the inner region of the solar system?
A. It is the coldest planet in the solar system.
B. It has a rocky surface that one could firmly stand on.
C. It contains a faint system of 13 rings.
D. It holds more than 76 satellites.
2. Which two pieces of data indicate that Jupiter resides in the outer region of the solar system?
A. It is primarily composed of hydrogen and helium.
B. It contains one natural satellite, the Moon.
C. It is the hottest planet in the solar system.
D. Its surface gases form into colorful bands.
E. It has a metal surface upon which one can stand.
3.Which statement accurately describes a similarity between Earth and Venus?
A. Both planets have an atmosphere primarily composed of oxygen.
B. Both planets show evidence of volcanic activity.
C. Both planets have retrograde rotation (clockwise, as viewed from above).
D. Both planets contain liquid water at their surface
4. Sort the sentences based on whether the attributes they describe belong to planets or an object that isn’t a planet.
A. The object orbits the sun.
B. The object is a satelite
C. The regions surrounding the object are free from debris.
D. The object is triangular in shape.
5. Match each attribute to the appropriate planet.
Venus
Jupiter
Earth
Mercury
densest planet in the solar system
hottest planet in the solar system
largest planet in the solar system
smallest planet in the solar system
The effort needed when a simple machine is used is best described by which of these statements?
Answer:
effort effort effort effort effort effort
QUESTION 1
What is the voltage (V) of a small appliance if the
current (I) is 12 A and the resistance (R) is 10 !?
Answer:
QUESTION 2
What is the resistance (R) if the current (I) is 15 A and
the voltage (V) is 230 V?
Answer:
QUESTION 3
Find the current (I) if the voltage (V) is 230 V and the
resistance (R) is 20 !.
Answer:
QUESTION 4
Find the voltage (V) if the resistance (R) is 25 ! and the
current (I) is 5 A.
Answer:
QUESTION 5
What is the resistance (R) if the current (I) is 25 A and
the voltage (V) is 230 V?
Answer:
QUESTION 6
Find the current (I) if the voltage (V) is 230 V and the
resistance (R) is 50 !.
Answer:
QUESTION 7
Find the voltage (V) if the resistance (R) is 35 ! and the
current (I) is 4 A.
Answer:
QUESTION 8
What is the resistance (R) if the current (I) is 15 A and
the voltage (V) is 24 V?
Answer:
check the attachments for the solution
Nancy ran a distance of 5km in 30 minutes. What is her speed in meters(m) per hour)h)
The speed of Nancy who ran a distance of 5 km in 30 minutes is 10000 meters(m) per hour(h).
What is the rate of speed?
The rate of speed is the rate at which the total distance is travelled in the time taken. Rate of speed can be given as,
[tex]s=\dfrac{d}{t}[/tex]
Here, (d) is the distance travelled by the object and (t) is the time taken but the object to cover that distance.
Nancy ran a distance of 5 km in 30 minutes. There are 60 minutes in one hour. Thus, the time in hour for which Nancy ran is,
[tex]t=\dfrac{30}{60}\\t=0.5\rm\; hr[/tex]
The meters in 5 kilometers is,
[tex]d=5\times1000\\d=5000\rm\; m[/tex]
She ran 5000 kilometers in 0.5 hours. Thus, the speed of her is,
[tex]s=\dfrac{5000}{0.5}\\s=10000\rm\; km/hr[/tex]
Thus, the speed of Nancy who ran a distance of 5 km in 30 minutes is 10000 meters(m) per hour(h).
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A woman suddenly pulls a cart with a box to the right. Explain the motion. (Look at the picture I provide)
The box moves to the left to its resisting change in motion AKA inertia.
What is law of inertia?The law of inertia of Newton's first law of motion states that an object at rest o uniform motion in a straight line will continue in that path unless it is acted upon by an external force and will move in the direction of the applied force.
When the woman applies a force on the cart, the cart will move in the direction of the woman applying the force, while the box will move backward due to resisting change in motion.
Thus, the correct answer is, the box moves to the left to its resisting change in motion AKA inertia.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
What property/properties of water allowed the water to stick to the penny?
Solution's:
Cohesion.Surface Tension.Explanation:
By these properties, the water molecules gets attracted to the other molecules. Hence, this makes the water get stick to the penny.
Answer:
cohesion and surface tension
Explanation:
The properties of cohesion as well as surface tension, possessed by water, made the water stick to the penny.
