Answer:
35 to 52 minutes
Please mark me as the brainliest
Electromagnetic radiation includes only visible light waves.
true or false
The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
False, There is other things aswell
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:
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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Do the data support or refute the hypothesis? be sure to explain your answer and include how the variables changed in the experiment.
Do the data support or refute the hypothesis, normally, the data for the first part of the experiment support the first hypothesis.
What is a hypothesis test?Hypothesis testing refers to the formal procedures used by statisticians to accept or reject these hypotheses. When trying to make decisions, it is convenient to formulate assumptions or conjectures about the populations of interest, which consist of considerations about their parameters.
As a result of this, we can see that from the complete text, there is a set of data which is used to show the force that is applied to a cart that causes the acceleration of the cart to increase which supports Newton's second law.
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Answer:
The data support the hypothesis. As the number of half-lives increased, the number of radioactive atoms decreased. With each half-life, approximately half of the radioactive atoms in a sample decayed to a stable isotope.
Explanation:
edge 2022
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.
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
What types of galaxies are these?
Answer:
the first one looks like a spiral galixy
the 2nd one looks like a lenticular galixy ?? (im pretty sure but not 100%)
the 3rd one looks like a elliptical galixy
Explanation:
Answer:
1. Spiral
2. Not sure but i think its irregular.
3. Elliptical
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If a brick has a density of 3.75g/mL and a mass of 20.25g, what is its volume
Answer:
5.4mL
Explanation:
20.25g divided by 3.75g/mL= 5.4mL
A gravitational field is generated by any object that has–
Answer:
Mass.
Explanation:
The Renaissance astronomer who wrote the pioneering book that suggested the Earth probably orbits the Sun (instead of the other way around) was: Group of answer choices Eratosthenes Copernicus Newton Ptolemy
The Renaissance astronomer who wrote the pioneering book that suggested the Earth probably orbits the Sun was Copernicus.
Who is an astronaut?An astronaut observes and performs the experiments based on the universe.
The astronomer observes the universe and its components closely using telescope being on the Earth. While the astronaut goes into space to look in closely.
The astronomer who gave the observation that Earth is orbiting around the Sun was Nicolaus Copernicus.
Thus, the correct option is Copernicus.
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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
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.
Four resistors (67 ohm, 83 ohm, 433 ohm, and 309 ohm in that order) are connected in series to a 7.92 V battery of negligible internal resistance. What is the voltage difference across the second resistor
Answer:
.737 v
Explanation:
Since they are in series....they all have the same current running through them.....find the total resistance to calculate the current:
R = 67 + 83 + 433 + 309 = 892 ohm
V/R = current = 7.92 / 892 = 8.87 mAmps
Now the voltage across ecah resistor is I R
for the second one 8.87 ma * 83 ohm = V = .737 V
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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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
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 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:
A uniform magnetic field b is perpendicular to the plane of a circular loop
A uniform magnetic field is perpendicular to the plane of a circular loop. The rate must the magnitude of change to induce a 10 A current in the loop.
What is uniform magnetic field?The magnetic field which doesn't change with respect to time is called the uniform magnetic field.
The resistance of the loop is related to the length of the wire as
R=ρ L/ A
Diameter of wire is 10 cm formed from wire of diameter 2.5 mm and resistivity is 1.69×10⁻⁸ Ω⋅m.
Substituting the values into the above equation, we get
R = {(1.69×10−8Ω⋅m) × π(0.10m)} / {π(2.5×10−3m)2/4}
R =1.1×10−3Ω
Current is related to emf as
i=∣ε∣/R
=∣dΦB/dt∣ / R
=(πl2/R) ∣ dB/dt ∣.
Substituting the given values from the question, we have rate of change of magnetic field
∣dB / dt∣ = πr2iR
∣dB / dt∣ = π(0.05m)2(10A)(1.1×10−3Ω)
∣dB / dt∣ =1.4T/s
Therefore, the rate must the magnitude of change to induce a 10 A current in the loop is 1.4T/s.
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A car has a kinetic energy of 4.32 x 10J when traveling at a speed of 23 m/s. What is its mass?
Answer
0.163 kg
Explanation:
[tex]\sf Kinetic \ Energy = \dfrac{1}{2} \ x \ mass \ x \ velocity^2[/tex]
Here we are provided with:
1) Kinetic Energy = 4.32 x 10 Joules ≈ 43.2 Joules
2) Speed/Velocity = 23 m/s
Now, solve for mass:
[tex]\rightarrow \sf \dfrac{1}{2} \ x \ mass \ x \ velocity^2 = Kinetic \ Energy[/tex]
[tex]\rightarrow \sf \dfrac{1}{2} \ x \ mass \ x \ (23)^2 =43.2[/tex]
[tex]\rightarrow \sf mass= \dfrac{43.2 (2)}{23^2}[/tex]
[tex]\rightarrow \sf mass= 0.163 \ kg[/tex]
What was the most impactful thing you took away from yesterdays event?
GIVE ME AN EXAMPLE OF BEING NERVOUS
Answer:
BEFORE A ROLLER COASTER
Explanation:
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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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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Which statement describes one of the main principles of Dalton's atomic theory? Elements of the same atom are identical. O Atoms of the same element are different. O Elements of the same atom are different. Atoms of the same element are identical.
Dalton's atomic theory is related to the characteristics of atom. The statement describes one of the main principles of Dalton's atomic theory is atoms of same element are identical.
What is Dalton's atomic theory?The Dalton's theory states that All matter is composed of extremely small particles called atoms and Atoms of a given element are identical in size, mass, and other properties. Atoms of different element are different.
Hence, the statement describes one of the main principles of Dalton's atomic theory is atoms of same element are identical.
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What is the momentum of a 8kg ball rolling at 25 m/s?
Answer:
200
Explanation:
P = M x V
P = 8 x 25
P = 200
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
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
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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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
