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
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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What does density measure?
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.
(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
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.
How many mL are in 3.2 gallons
Answer:
12113.318mL
Explanation:
I hope this helps
can someone pls help me create a lab trying to prove steam is hotter than boiling water.
Answer:
More energy
Explanation:
Steam is hotter than boiling water because it contains more energy
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?
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:
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.
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).
an object of 98 N weight is dropped from 10 m height and it hit ground with a speed of 12 m/s find air friction
vf²=vi²+2ad
12²=0+2.a.10
a = 7.2 m/s²
W = m.g
m = W/g = 98/9.8 = 10 kg
∑F=m.a
W-fr=m.a
fr(air friction)=W - m.a
fr = 98 - 10 x 7.2
fr = 98 - 72
fr = 26 N
Greyhounds are among the fastest dogs on earth. On average, what is the fastest speed they can run?.
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
[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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How long does it take an airplane, accelerating from rest at 5.00 m/s2, to travel 360 m?
A boat is rocking back and forth in the middle of the ocean. It takes 3 seconds for a wave to pass by before the next wave appears. The speed of the wave is 5 m/s. What is the wavelength?
The wavelength of the water wave is 15 m.
What is wavelegth?Wavelength is the distance of a complete cycle traveled by a wave.
To calculate the wavelength of the wave, we use the formula below.
Formula:
v = λ/T.................Equation 1Where:
v = velocity of waveT = periodλ = wavelength.make λ the subject of the equation
λ = vT............... Equation 2From the question,
Given:
v = 5 m/st = 3 secondsSubstitute these values into equation 2
λ = 5(3)λ = 15 m.Hence, The wavelength of the water wave is 15 m.
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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
Explanation:
This is the correct answer...
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This question is about magnetisation. I will give brainliest!!
Answer:
By seeing by how far away can it attract a paperclip.
Explanation:
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
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.
What is the value for G
how density of arock can be determined using normal laboratory apparatus
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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What is the period of a water wave with a frequency of 0.5Hz
Answer:
a wave with a time period of 2 seconds has a frequency of 1 ÷ 2 = 0.5 Hz. A sound wave has a time period of 0.0001 seconds.
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.
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 does the dancing activity help you in improving fitness skills
•How does the dancing activity help you in improving fitness skills?
Answer:
•Health benefits of dancing
improved condition of your heart and lungs. increased muscular strength, endurance and motor fitness. increased aerobic fitness. improved muscle tone and strength.
Explanation:
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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
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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average speed?
It takes you 20 minutes to walk 1.5 miles to school. How far can you walk in one hour?
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
calculate the kinetic energy of: a car of mass 1200 kg that travels 60m in 3sec.
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!
What are ngc 2444 and ngc 2445, which nasa says are engaged in a "cosmic tug-of-war" with one apparently affecting the conditions of the other?.
The "cosmic tug-of-war" between NGC 2444 and NGC 2445 has result in the creation of new stars based on NASA's report.
What is a "cosmic tug-of-war"?A "cosmic tug-of-war" can be defined as a terminology that is used in astronomy to express the ratio of astronomical (planetary) and solar attractions on a natural satellite in space.
According to the National Aeronautics and Space Administration (NASA), NGC 2444 and NGC 2445 are both described as being engaged in a "cosmic tug-of-war" with NGC 2444 seemingly winning the battle..
In conclusion, NGC 2444 and NGC 2445 are both engaged in a "cosmic tug-of-war" because the immense gravity of NGC 2444 is pulling strands of gas from NGC 2445.
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Frog jumps to the left with average speed of 1.8 m/s for 0.55 s whats the frogs displacement in meters
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)
. If you travel for a total of 60 minutes going 20 mph, what is your total distance?
Answer:
you will go 20 miles.
Explanation:
19 yds is the same as how many meters
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?
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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Which aspect must be taken into consideration when creating a model of radioactive decay?
Answer:
The weak nuclear force perhaps?
Explanation:
the weak nuclear force is the fundamental force responsible for the radioactive decay of particles
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.
(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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