Answers
Answers:
TrueTrueTrueTrueTrueTrueTrueFalseTrueTrueWeirdly it seems like each answer choice, except problem 8, is "true".
========================================================
Explanations:
Think of a pebble dropping into a water to cause a ripple. The energy going outward in all directions requires the water as the medium for that energy wave to travel. Each particle bumps into another to transfer the energy.This is fairly self explanatory that I'm not sure what to write as an explanation here. Longitudinal waves are ones where they act like a slinky. A blast of energy causes compression and that compression leads to expansion later on (followed by further cycles of compression+expansion). This chain reaction causes a domino effect so the sound wave reaches the target to be absorbed or reflected.This is true because light is much faster than sound. This is why fiberoptic cables are used to transmit voices on a telephone line rather than use the sound of the voices themselves to transmit. It's also why, during a thunderstorm, a flash of light strikes first before the rumbling sound of thunder follows a few seconds after.This is true and it shouldn't take too much convincing to see how "electromagnetic" breaks up into "electrical" and "magnetic". These types of waves can travel through the empty vacuum of space without needing a medium like mechanical waves do. This is why energy of the sun can reach us. Visible light is part of the spectrum along with stuff like x-rays, gamma rays, microwaves, and radio waves.There's not much to say here. Shadows are the absence of light.This is true because a beam of light bounces off an object, and reflects into our eyes so we can see the object. Unlike every other answer choice, this answer is false. Doctors don't use microwaves to get pictures of teeth and bones. Instead they use x-rays.This is true. Refer to the ROYGBIV color scale for more info.This seems a bit vague. Does your teacher mean visible light? If so, then yes our eyes can detect it. Otherwise for things like x-rays we cannot detect these wavelengths. I'll assume visible light for now.Related Questions
How long does it take an airplane, accelerating from rest at 5.00 m/s2, to travel 360 m?
Answers
-list out our knowns and unknowns:
Vi=0m/s
a=5.00m/s^2
d=360m
Vf=?
t=?
-first, let’s solve for Vf. We will avoid using a formula that contains t, as we do not know that value yet. Let’s use this one:
vf^2 = vi^2 + 2ad
-Plug in your values:
vf^2 = (0^2) + 2 (5.00) (360)
vf^2 = 3600
vf = 60m/s
-solve for t. choose a formula. Here’s a good one to use:
d= (vi+vf/2)t
-plug in your values:
360=(0+60/2)t
360=30t
360/30=t
t=12 seconds
You've got a flat tire. To lift your car, you make a homemade lever (see the figure (Figure 1)). A very light 1.6-m-long handle part is pushed down on the right side of the fulcrum and a 0.050-m-long part on the left side supports the back of the car.
How hard must you push down on the handle so that the lever exerts an 6900- N force to lift the back of the car?
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How hard you must push down on the handle is by applying a force of 215.63 N
Moment of a forceThe moment of a force about a point is the turning effect of the force about that point.
The moment of a force M = Fd where
F = force and d = perpendicular distance of force from pivot point.Now, for you to lift up the car, the moment due to your force about the fulcrum, M equals the moment due to the force on back of car. M'
M = M'
FD = F'd where
F = Force applied, D = distance of force from fulcrum = 1.6 m, F' = force applied on back of car = 6900 N and d = distance of force on back of car from fulcrum = 0.050 mMaking F subject of the formula,we have
F = F'd/D
Substituting the values of the variables into the equation,we have
F = F'd/D
F = 6900 N × 0.050 m/1.6 m
F = 345 Nm/1.6 m
F = 215.625 N
F ≅ 215.63 N
So, how hard you must push down on the handle is by applying a force of 215.63 N
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2. The resistance of the bulbs shown in the figure is 12 Ω each. What will the voltmeter read when the first switch is on and both switches are on?
3. The diagram in the figure shows the circuit data. Calculate the amperage of the circuit and the voltage across resistor R5 when:
(a) the switch is on;
(b) the switch is off.
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As resistance doesn't affect potential difference voltmeter reading remains 6V
#3
#a
R=3ohmV=9VSo
Apply ohms law
[tex]\\ \rm\rightarrowtail I=\dfrac{V}{R}[/tex]
[tex]\\ \rm\rightarrowtail I=\dfrac{9}{3}=3A[/tex]
I is current#b
Switch is off
Current=0Ahow density of arock can be determined using normal laboratory apparatus
Answers
Answer:
Explanation: Take the apparatus fill it with water which is enough to sink the rock, next write down the reading of the apparatus with only the water. next drop the rock in the water and write down the reading with the water and the rock. next calculate change in volume ( here volume is the reading in the apparatus). next find the weight of the rock.
Then put the values into this equation
Density = mass/volume
if you took all the units in SI units then the unit of density is Kg/m^3
The density of a rock can be determined using normal laboratory apparatus through a method known as the "Archimedes' principle" or the "water displacement method".
Materials needed: 1. Electronic balance or scale 2. Graduated cylinder or beaker 3. Water
1. Weigh the rock: Use an electronic balance or scale to measure the mass (weight) of the rock. Record this value in grams (g).
2. Find the rock's volume:
a. Fill the graduated cylinder or beaker with a known amount of water.
b. Note the initial water level reading in milliliters (ml).
c. Carefully lower the rock into the water, making sure not to splash or spill any water.
d. Measure the new water level in the graduated cylinder or beaker after the rock is submerged. Record the final water level reading in milliliters (ml).
e. The volume of the rock can be calculated by subtracting the initial water level from the final water level. This difference represents the volume of the rock displaced by water.
3. Calculate the density:
The density (ρ) of the rock can be determined using the formula:
ρ = Mass of the rock (in grams) / Volume of the rock (in milliliters)
4. Report the result:
The density of the rock is typically expressed in grams per cubic centimeter (g/cm³) or grams per milliliter (g/ml).
This method can provide a reasonably accurate determination of the rock's density. However, keep in mind that the density may vary slightly depending on the specific rock composition and porosity. For precise measurements or for rocks with complex structures, more sophisticated laboratory techniques may be employed.
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The diagram shows a simple circuit system containing wires, a battery, a switch, and a light bulb. Alert your teacher if this image is missing. Select the energy forms that are being produced when the switch is ON. The diagram shows a simple circuit system containing wires, a battery, a switch, and a light bulb. Alert your teacher if this image is missing. Select the energy forms that are being produced when the switch is ON. potential and sound thermal and nuclear magnetic and chemical thermal and light
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The sequence of energy conversions is; chemical energy ---> electrical energy ----> heat and light energy
What is energy transformation?According to thee first law of thermodynamics, energy can neither be created nor destroyed but can be converted from one form to another. This is also called the principle of conservation of energy.
When the switch is turned on, chemical energy of the battery is converted to electrical energy is produced which is then converted to heat and light energy in the light bulb.'
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Answer: Thermal and Light
Explanation: When the switch is ON, the light bulb turns on, creating light. After a minute, the bulb will start to warm up, and so will the battery.
Which aspect must be taken into consideration when creating a model of radioactive decay?
Answers
Answer:
The weak nuclear force perhaps?
Explanation:
the weak nuclear force is the fundamental force responsible for the radioactive decay of particles
Calculate the potential difference required across a conductor of resistance 5 ohm to pass a current of
1.5 A through it .
Answers
Answer:
7.5 volts
Explanation:
V= IR
V= 1.5×5
V= 7.5 volts
please help me on answer
Answers
Answer:
The slope is 0.5
Explanation:
It increases so it is positive and it increases by half a block each time so 0.5.
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Think of an animal that has a distinctive or unusual body shapes. Describe how its body shape helps its momentum and how momentum affects its survival.
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penguins! so momentum is based on mass and velocity, the advantages is that they have stored mass in the form of like fats to keep them warm however they are built to slide basically so that there is less friction when they travel so sideways their bullet like shape helps increase velocity so they have both mass and considerable velocity!
A ball weighted 20 Newton's rolls 20 meters in a straight line on a level surface. What is its change in potential energy?
A. 0 J
B. 1 J
C. 40 J
D. 400 J
Answers
[tex]\\ \rm\Rrightarrow Work\:done=Force(Distance)[/tex]
[tex]\\ \rm\Rrightarrow Work\:done=20(20)=400J[/tex]
Option D
The change in the potential energy of the ball is equal to 0J. Therefore, option (A) is correct.
What is the work?Work can be described as the energy used when a force is exerted to move an object through a specific displacement. The work done can be defined as it depends upon both the force on the object and the displacement by the object.
The displacement in a straight line in the direction of the applied force over a distance 'd'.
W= F × d
Where 'F' is the exerted force and 'd' is the displacement by the object.
The change in the potential energy or kinetic energy is equal to the work done.
The change in the potential energy = mgh₂ - mgh₁
The ball roll over the surface, h₂ = h₁
Therefore, the change in the potential energy is equal to zero.
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The average speed of sound in ocean water is 1510 m/s. If a sound travels
with a wavelength of 20 m, what is its frequency?*
0. 01 Hz
75. 5 Hz
30. 2 MHz
30,200 Hz
Answers
Answer:
75. 5 Hz
Explanation:
velocity = frequency × wave length
1510 = frequency × 20
frequency = 1510÷20 = 75.5 Hz
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net force acting on a 100kg man standing in an elevator accelerating downward with a=9.8 m/s^2 comes out to be:
a. 980N
b. 580N
c. 1380N
d. zero
Answers
Explanation:
F=ma=(100kg)(4m/s/s)=400N
N is Newton, the SI unit of force, which is a kg•m/s/s. F is net force and, of course, m is mass and a is acceleration.
The net force acting on a 100kg man standing in an elevator accelerating downward with a=9.8 m/s^2 is d. zero
What is force?
Force is a push or pulls on an object that causes it to change its speed or direction.It is an external agent capable of changing the state of rest or motion of a body. It is a vector quantity so it has a magnitude and a direction.calculation force of a lift:-
net force,
Mg-F=Ma
100*9.8-F=100*9.8
F=100*9.8-100.9.8
F= 0
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a certain light wave has a frequency of 4.29 x 10^14 hz. what is the wavelength of this wave in empty space
Answers
The wavelength of a wave that has a frequency of 4.29 x 10^14 Hz is 6.9 × 10-⁵m.
HOW TO CALCULATE WAVELENGTH?The wavelength of a wave can be calculated using the following formula:
λ = v/f
Where;
λ = wavelengthv = velocityf = frequencyλ = 3 × 10⁸ ÷ 4.29 × 10¹⁴
λ = 0.69 × 10-⁶
λ = 6.9 × 10-⁵m
Therefore, the wavelength of a wave that has a frequency of 4.29 x 10^14 Hz is 6.9 × 10-⁵m.
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In a bolt of lightning, 45, n, C,45nC flows to ground in 25, m, s,25ms. Work out the average number of charge carriers flowing past per second.
If 56, times, 10, to the power 16 ,56×10 16 electrons flow to the ground in 0, point, 035, mu, s,0.035μs, work out the average current.
How long does it take for a current of 6, point, 0, A,6.0A to deliver 1, point, 5, times, 10, to the power 17 ,1.5×10 17 [[Unsupported equation]]CuX
2+ ions in a solution? Assume these ions are the only charged particles moving.
Answers
(a) The average number of charge carriers flowing past per second is 1.8 x 10⁻⁶ A
(b) The average current delivered in the given time is 2.56 x 10⁶ A.
(c) The time taken to deliver the charge is 32,166.7 s.
Average number of charge flowing per secondThe average number of charge flowing per second is calculated as follows;
I = Q/t
I = (45 x 10⁻⁹) / (25 x 10⁻³)
I = 1.8 x 10⁻⁶ A = 1.8μ A
Average currentThe average current is number of charge flowing in a second.
I = Q/t
Charge of one electron = 1.6 x 10⁻¹⁹ C
Charge of 56 x 10¹⁶ electrons = 56 x 10¹⁶ x 1.6 x 10⁻¹⁹ C = 0.0896 C
I = (0.0896) / (0.035 x 10⁻⁶)
I = 2.56 x 10⁶ A
Time taken to deliver the chargeTotal charge in 2+ ions = 2F
1 Faraday = 96,500 C
2F = 2 x 96,500 C = 193,000 C
At the given amount of current, the time taken to deliver the charge is calculated as follows;
Q = It
t = Q/I
t = (193,000 )/6
t = 32,166.7 s = 8.9 hours
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A convex, or converging, lens with a focal length of 34 cm is used to observe an image of an apple than is 80 cm away from the lens. At what distance from the lens does the image form and what type of image is it?.
Answers
The image distance is 59.2 cm and the image is real and small.
Image distanceThe distance of the image formed by the convex or converging lens is determined by applying the following lens equation.
1/f = 1/u + 1/v
where;
f is the focal length = 34 cmu is the object distance = 80 cmv is the image distance = ?1/v = 1/f - 1/u
1/v = 1/34 - 1/80
1/v = 0.0294 - 0.0125
1/v = 0.0169
v = 1/0.0169
v = 59.2 cm
Thus, the image distance is 59.2 cm and the image is real and small.
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(d) A wire Y has the same cross-sectional area as wire X and is made of the same metal. Wire Y
is longer than wire X.
Wire X in the circuit is now replaced by wire Y. Assume that wire Y has the same temperature
as wire X.
State and explain whether the average drift speed of the free electrons in wire Y is greater
than, the same as, or less than that in wire X.
(3)
w]
X]
g
29°C
Answers
Answer:
If the potential difference between the ends of the wire are the same then wire Y will experience a smaller drift speed. This is necessary to explain the difference in resistivity.
Where is Earth’s magnetic south pole located? What about the magnetic north pole? What does this say about how a compass needle will react to the poles?
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Answer:
Currently, the magnetic south pole lies about ten degrees distant from the geographic north pole, and sits in the Arctic Ocean north of Alaska. The north end on a compass therefore currently points roughly towards Alaska and not exactly towards geographic north.
Explanation:
5. A family leaves for an evening walk around the neighborhood. They leave at 5 pm and return at 6 pm. They traveled a total of 2.5 miles. What is their average speed?
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This question involves the concepts of average speed, distance, and time.
The average speed of the family is "2.5 mi/hr".
AVERAGE SPEEDThe average speed is defined as the ratio of the total distance covered with the total time taken to cover it.
[tex]v=\frac{s}{t}[/tex]
where,
s = distance covered = 2.5 milest = total time taken = 1 hourv = average speed = ?Therefore,
[tex]v=\frac{2.5\ mi}{1\ hr}[/tex]
v = 2.5 mi/hr
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average speed?
It takes you 20 minutes to walk 1.5 miles to school. How far can you walk in one hour?
Answers
Answer:
4.5 miles
Explanation:
20 minutes x 3 is 1 hour
1.5 x 3 is 4.5
Answer:
4.5 Miles
Explanation:
20 x 3 = 60
60 min = 1 hour
1.5 x 3 = 4.5
Suppose you are playing ice hockey in the middle of a totally frictionless frozen pond? How can you move yourself to the edge of the pond? Remember that without friction, you won't be able to push against the ice. Explain what you would do and why it would work.
Answers
Answer:
if it is totally frictionless you can only need to throw the hockey stick to one other side and wait for yourself to move slowly to the other side. this will happen by the law of conservation of momentum and Newton's First law (continues to move in the uniform velocity without external I. e. friction, Force).
What does density measure?
Answers
Answer:
I think the answer is c.) how much volume something has
Answer:
it measures the volume of a object. (or material substances. ) SO C. HOW MUCH VOLUME SOMETHING HAS.
Greyhounds are among the fastest dogs on earth. On average, what is the fastest speed they can run?.
Answers
HELP!!!
Why is it important for governments
to invest in new technologies to
provide energy??
Answers
energy security and affordability, the potential for job creation, future economic strategic positioning, and addressing environmental and other externalities.
19 yds is the same as how many meters
Answers
What is the value for G
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A beam of light passes through the air (n = 1. 00) and enters a diamond (n - 2. 42) at an angle of incidence of 40 degrees. Use Snell's Law to find the angle of refraction in the diamondIf the diamond is placed in a tank of water (n - 1. 33) and the beam of light enters the diamond at the same angle of incidence, what would be the new angle of refraction Show all work
Answers
Explanation:
This is the correct answer...
I hope you understand...
. If you travel for a total of 60 minutes going 20 mph, what is your total distance?
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Answer:
you will go 20 miles.
Explanation:
This question is about magnetisation. I will give brainliest!!
Answers
Answer:
By seeing by how far away can it attract a paperclip.
Explanation:
Frog jumps to the left with average speed of 1.8 m/s for 0.55 s whats the frogs displacement in meters
Answers
Answer: 0.99m left
Explanation:
The formula:
Distance / Time = Rate
Fill in the formula
Distance / 0.55s = 1.8 m/s
Multiply both sides by 0.55s
Distance = 0.99m
Displacement = 0.99m to the left.
Answer:
-0.99 (See attached)
Explanation:
(See attached)
calculate the kinetic energy of: a car of mass 1200 kg that travels 60m in 3sec.
Answers
Answer:
240,000 J or 240 kJ
Explanation:
We can use the equation for kinetic energy:
KE = [tex]\frac{1}{2}mv^{2}[/tex]
where m = mass and v = velocity
Next, substitute the known values into the equation:
mass = 1200 kgvelocity = 60m in 3 seconds → 60/3 = 20 m/sKE = 1/2 × 1200 × 20² = 240,000 J
Answer: 240,000 J or 240 kJ
Hope this helps!