What is the time period of a pendulum which oscillates 20 times in 2 seconds?
Answers
Explanation:
The pendulum oscillates 10 times in 1 second.
Thus the frequency is 10 Hz
Now the time period will be 1/f = 1/10 = 0.1s
Related Questions
if the speed of transverse waves on the string is 359 m/s , what is the length of the string? assume that the mass of the wire is small enough for its effect on the tension in the wire to be neglected.
Answers
For a string stretched between two supports, two successive standing-wave frequencies are 520 Hz and 635 Hz . There are other standing-wave frequencies lower than 520 Hz and higher than 635 Hz .If the speed of transverse waves on the string is 359 m/s , the length of the string is 0.565 meters.
To determine the length of the string, we can use the formula for the speed of waves on a string:
v = fλ
where v is the speed of the waves, f is the frequency, and λ is the wavelength.
In a standing wave pattern, the wavelength is related to the length of the string and the mode of vibration. For a string fixed at both ends, the wavelength of the nth harmonic is given by:
λₙ = 2L/n
where L is the length of the string and n is the mode of vibration.
From the given information, we have two successive standing-wave frequencies: 520 Hz and 635 Hz. These frequencies correspond to the first and second harmonics, respectively (n = 1 and n = 2).
Using the formula for the wavelength, we can write:
λ₁ = 2L/1
λ₂ = 2L/2 = L
We know the speed of transverse waves on the string is 359 m/s.
For the first harmonic:
v = f₁λ₁
359 m/s = 520 Hz * λ₁
For the second harmonic:
v = f₂λ₂
359 m/s = 635 Hz * L
Solving these equations, we can find the length of the string:
L = 359 m/s / 635 Hz
L = 0.565 meters
Therefore, the length of the string is approximately 0.565 meters.
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The complete question is:
For a string stretched between two supports, two successive standing-wave frequencies are 520 Hz and 635 Hz . There are other standing-wave frequencies lower than 520 Hz and higher than 635 Hz .If the speed of transverse waves on the string is 359 m/s , what is the length of the string? Assume that the mass of the wire is small enough for its effect on the tension in the wire to be neglected.
A car goes around a curve traveling at constant speed. Which of the following statements is correct? Check all that apply Check All That Apply The acceleration of the car is zero. 0 The net force on the car is zero. 0 The net force on the car is not zero. 0 The acceleration of the car is not zero.
Answers
There is a net force acting towards the center of the curve, which provides the centripetal force necessary to keep the car moving in a circular path. The correct statements are: 1 & 4.
When a car goes around a curve at a constant speed, its velocity is changing because the direction of motion is changing. Velocity is a vector quantity that includes both magnitude (speed) and direction. Since the direction of the car's velocity is changing, it is experiencing acceleration even if its speed remains constant. This acceleration is called centripetal acceleration and is directed towards the center of the curve.
According to Newton's second law of motion, the net force acting on an object is equal to its mass multiplied by its acceleration. Since the car is moving at a constant speed, there is no net force acting on it in the direction of motion. However, there is a net force acting towards the center of the curve, which provides the centripetal force necessary to keep the car moving in a circular path. Therefore, the correct statements are 2. The net force on the car is zero, and 4. The acceleration of the car is not zero.
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The complete Question is, car goes around a curve traveling at constant speed. Which of the following statements is correct?
Check all that apply
1. The acceleration of the car is zero.
2. The net force on the car is zero.
3. The net force on the car is not zero.
4. The acceleration of the car is not zero.--
how can you reduce output voltage to 6v in transformers if the input voltage is 240v
Answers
Answer:
\(N_P = 40\ N_S\)
To reduce the output voltage to 6v in transformers if the input voltage is 240v, we need to have 40 times as many turns in the primary coil as there are in the secondary coil.
Explanation:
The change in voltage of a transformer depends upon the turns ratio of the transformer between secondary and primary coil. Following formula can be used to determine the turns ratio in this case:
\(\frac{N_P}{N_S} = \frac{V_P}{V_S} \\\\\)
where,
\(N_P\) = No. of turns in the primary coil
\(N_S\) = No. of turns in the secondary coil
\(V_P\) = voltage in the primary coil = 240 V
\(V_S\) = voltage in the secondary coil = 6 V
Therefore,
\(\frac{N_P}{N_S} = \frac{240\ V}{6\ V} \\\\N_P = 40\ N_S\)
To reduce the output voltage to 6v in transformers if the input voltage is 240v, we need to have 40 times as many turns in the primary coil as there are in the secondary coil.
A hover board is moving at 6 m/s . If it slows down at a rate of -3 m/s per second, how long is the board in the air before coming to rest? Round to 4 decimal places if necessary
Answers
Explanation
a uniformly accelerated motion is the one in which the acceleration of the particle throughout the motion is uniform,to fidn the time take we can use the formula:
\(\begin{gathered} t=\frac{v_f-v_1}{a} \\ where \\ v_f\text{ is the final velocity} \\ v_{i\text{ }}\text{ is the initail velocity} \\ a\text{ is the acceleration, so} \end{gathered}\)Step 1
a)Let
\(\begin{gathered} v_i=6\text{ }\frac{m}{s} \\ v_f=0(\text{ rest\rparen} \\ a=-3\frac{m}{s^2} \end{gathered}\)b) now, replace
\(\begin{gathered} t=\frac{v_{f}-v_{1}}{a} \\ t=\frac{0-(-6\frac{m}{s})}{3\frac{m}{s}} \\ t=2\text{ seconds} \end{gathered}\)therefore, the answer is 2 seconds
I
a runner runs around a circular track covers a distance of 200m, ending in the spot where she started if the entire trip takes 50 seconds , what is her average velocity?
Answers
Answer:
0 ms-1
Explanation:
This is a trick question.
* Don't be confused with average speed with average velocity
Since the runner ends in the same spot as she started,
the total displacement covered by the runner is zero.
Since average velocity = total displacement/total time,
As total displacement is zero ,
average velocity = 0 / 50 ms-1
= 0 ms-1
Kyra and Pari are timing how long it takes for 1 g of sugar to dissolve in hot water. Kyra records a time of 24.3 seconds. Pari records a time of 24 seconds. Whose reading is more precise? Why?
Answers
compared to the star it evolved from, a white dwarf is
Answers
A white dwarf is evolved from any other star, planet, asteroids or any other celestial body that loses its path of revolution or does not revolve around anything.
In our solar system, evolvement and destruction of celestial bodies take place regularly at irregular intervals. Old planets and stars bursts out with a explosion, then they heat up so immensely or just scatter into pieces of rocky substance or smoky particles or just ice particles. But if they heat up, they change into dwarf stars when they lose their path of revolve. Any celestial body is dwarf when it losses their path. Hence, we can see that a white dwarf is evolved from any other star, planet, asteroids or any other celestial body that loses its path of revolution or does not revolve around anything.
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15 grams of water is placed into a beaker that has a mass of 120 grams what is the mass of the water and beaker together
Answers
Answer:
135
Explanation:
15grams of water + 120 grams of beaker=135 grams together
Answer:
15 grams + 120 grams =135 grams all together
how do scientist check repeatability of results
Answers
Answer:
If research results can be replicated, it means they are more likely to be correct.
Answer: There are many things that have to be checked in order to know
Explanation:
For repeatability to be established, the following conditions must be in place: the same location; the same measurement procedure; the same observer; the same measuring instrument, used under the same conditions; and repetition over a short period of time.
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when viewing the spectrum in the spectroscope, you should hold it such that...
Answers
When viewing the spectrum in the spectroscope, you should hold it such that violet is on the left, red on the right.
Ultraviolet light has shorter wavelengths than violet light that is visible.
we must position the spectroscope so that purple is to the left and red is to the right when examining the spectrum.
Along with the orange and violet counterpart in the visible spectrum, red is the color with the longest wavelength.
When light of different wavelengths is scattered by a prism, the different colors travel at different speeds, which results in them being separated in the prism.
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Using the model above, which letter represents the position of the earth when the northern hemisphere is experiencing the shortest hours of daylight
A
B
C
D
Answers
Answer:
At position "B" the northern hemisphere is tilted the most from the earth-sun direction and will experience the shortest hours of daylight, (and also the most indirect sun rays).
a light bulb with a resistance of 10 ω is hooked up to a 2 v battery. if this light bulb were replaced by a bulb with 20 ω of resistance, what would change about the circuit?
Answers
When the light bulb with a resistance of 10 Ω is replaced by a bulb with 20 Ω of resistance, replacing the light bulb with a higher resistance would result in a decrease in current, brightness, power consumption, and heat generation in the circuit.
Here are the key changes:
1. Current: The current in the circuit would decrease. According to Ohm's Law (I = V/R), as the resistance increases and the voltage (V) remains constant, the current (I) decreases.
2. Brightness: The brightness of the bulb would decrease. Since the current is reduced, less electrical energy is flowing through the bulb, resulting in lower light output.
3. Power: The power consumed by the circuit would decrease. Power is calculated using the formula P = IV, where P is power, I is current, and V is voltage. As the current decreases, the power consumption of the circuit decreases.
4. Heat dissipation: The bulb with a higher resistance would generate less heat compared to the lower resistance bulb. This is because heat dissipation in a circuit is directly proportional to the square of the current (P = I²R), and with reduced current, less heat would be produced.
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A light ray travels through water and reflects off a glass surface back into the water. How do the phases of the incident light and the reflected light compare?.
Answers
The light travels through water and gets reflected off on the glass surface into the water. There had been a 180° phase change between the incident and the reflected wave. This is called Total internal reflection (TIR).
In total internal reflection, in physics, a ray of light in a medium such as water or glass is completely reflected back into the medium from the surrounding surfaces. This phenomenon occurs when the angle of incidence is greater than a certain critical angle called the critical angle.
TIR only occurs when both of the following two conditions are met
Light is in a denser medium and is approaching a less dense medium. The angle of incidence should be greater than the so-called critical angle.Thus, the phases which include the TIR are the incident and the reflected phase and the incident light hits the surface while the reflected light reflects back.
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What are the tubes that equalize pressure to the eardrum in a frog?
Answers
In a frog, the tubes that equalize pressure to the eardrum are known as Eustachian tubes. It helps in maintaining the pressure balance between the middle ear and the external environment.The Eustachian tubes in frogs are similar to the ones present in humans. The Eustachian tube is a long, narrow tube that connects the middle ear to the nasopharynx.
The tube is lined with mucous membranes and is responsible for regulating air pressure in the middle ear to equalize it with the pressure outside the body. This ensures that the eardrum vibrates correctly and that sound waves can be transmitted to the inner ear.The Eustachian tube in frogs is crucial to their survival as they are amphibians, and they need to have a functional hearing system for detecting predators and prey. The Eustachian tube helps the frog to regulate the pressure in the middle ear while swimming, which prevents damage to the eardrum due to pressure differences.The Eustachian tube also serves another purpose in frogs, it is used for respiration. Frogs breathe through their skin and mouth, but when they dive underwater, they use their Eustachian tubes to take in air. The frog closes its mouth and nostrils, while the lungs are empty, to draw in oxygen-rich air through the Eustachian tubes. This way, the frog can stay underwater for longer periods without suffocating or drowning.
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A 3.1 x 1023 kg object and a 7.3 x 105 kg object are orbiting each other in deep space. If these two objects are 4.3 x 1010 meters apart, what is the magnitude of their gravitational force?
Answers
The gravitational force on the object of masses 3.1×10²³ kg and 7.3×10⁵ kg respectively is 8.16×10⁻³ N.
What is gravitational force?Gravitational force is the most prevalent force in the universe, pulling together on any two objects with mass in the universe.
To calculate the magnitude of the gravitational force, we use the formula below.
Formula:
F = GmM/r²............... Equation 1Where:
F = Gravitational forcem = Mass of the first objectM = Mass of the second objectr = Distance between the objectsG = Universal constant.From the question,
Given:
m = 3.1×10²³ kgM = 7.3×10⁵ kgG = 6.67×10⁻¹¹ Nm²/kg²r = 4.3×10¹⁰ mSubstitute these values into equation 1
F = (3.1×10²³× 7.3×10⁵×6.67×10⁻¹¹)/(4.3×10¹⁰ )²F = 8.16×10⁻³ NHence, the gravitational force is 8.16×10⁻³ N.
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Select the correct answer from each drop-down menu.
Complete the steps to construct a square inscribed in a circle.
Step 1: Start by drawing a circle.
Step 2: On the circle,__________
Label its endpoints A and C.
Step 3: Set the width of the compass larger than the radius of the circle.___________,centered at A and C, on each side of the
diameter.
Step 4:__________ and the center of the circle. Label the points of intersection with the circle as B and D.
Step 5: Draw chords AB, BC, CD, and DA.
and the center of the circle. Label the points of intersection with the circle as B and D.
step 2. A. drawing an Arc
B. Drawing a diameter
C. Draw a Chord
D. Draw a Square
step 3. A. Draw Diameters
B. Draw Squares
C. Draw intersecting arcs
D. Draw Cords
Step 4. A. Draw a line through the intersecting Arcs
B. Draw a line intersecting the diameters
C. Draw an arc intersecting the diameters
D. Draw an arc intersecting the arcs
Answers
Step 2: Draw a diameter of the circle, labeling its endpoints A and C, option B.
Step 3: Draw intersecting arcs, using the compass set to a width larger than the radius of the circle, centered at A and C, on each side of the diameter, option C.
Step 4: Draw a line through the intersecting arcs and the center of the circle. Label the points of intersection with the circle as B and D, option A.
What is a polygon?A polygon is a 2-dimensional geometric shape that is defined as a closed figure formed by straight lines or segments. It can have three or more sides and angles, and the sides do not intersect or overlap.
Examples of polygon shapes include triangles, squares, rectangles, pentagons, hexagons, and so on. The type of polygon is determined by the number of sides it has, with triangular polygon having three sides, square polygons having four sides, and so on.
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Why does your head hurt when you go deep underwater?
Answers
Answer:
The pressure under water . It presses against your head
Explanation:
Amir bought a lamp with a design attached to it that casts a shadow when the lamp is lit, as shown below. He wants to carryout an experiment using this lamp to find out the factors that effect the size of the shadow.
The effect of which factors can he actually find out using only this lamp?
Answers
The effect of the factors which he can he actually find out using only this lamp to determine the size of shadow is the light intensity and type of object.
What is Experiment?
This forms part of the scientific methods and is referred to as a procedure which is used to support or refute an hypothesis.
The size of the shadow is dependent on factors such as the light intensity and the type of object. Since the lamp produces the light in which the intensity can be gotten and the type of material it is in contact with then it therefore the correct choices.
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Sound waves are produced when something is caused to:.
Answers
Sound waves are produced when something is caused to vibrate, creating a disturbance in the surrounding air molecules which then propagate as waves of pressure and particle movement.
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in). Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges.
So, Sound waves are produced when something is caused to vibrate, creating a disturbance in the surrounding air molecules which then propagate as waves of pressure and particle movement.
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in the previous problem, if your system's power use under load is 125 watt, and your electricity cost was 15cents per kwh (kilowatt hour), what is the cost of power for running the system for a month under continuous load? enter answer in dollars and cents, accurate to the nearest penny.
Answers
In the previous problem, if your system's power use under load is 125 watts, and your electricity cost was 15 cents per kwh (kilowatt hour), the cost of power for running the system for a month under continuous load would be $16.38.
A watt is a unit of power in the International System of Units (SI). One watt is equal to one joule per second (J/s), or one ampere of electrical current with a potential difference of one volt (A⋅V). Electricity is the set of physical phenomena related to the presence and motion of matter that has the property of electric charge. It is associated with charged particles, including electrons, protons, and ions, and the electromagnetic fields that interact with them. Penny is a monetary unit of the United States, worth one cent. It's the smallest denomination of currency in the US, with the exception of the half-cent that was previously used.
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please help only a few minutes to answer
Answers
Answer:
The ball final velocity is 85.75 m/s
Explanation:
According to the problem, ball is dropped from the window and it experience an acceleration due to Earth's gravity which is denoted by g.
Initially, the ball is at rest, so its initial velocity is zero. The ball takes 8.75 s to fall from the window and hits the ground.
The equation of motion for constant acceleration is :
v = u + at
Here v is final velocity, u is initial velocity, t is time and a is acceleration.
In this case, u is zero and a is equal to g. So, the equation becomes :
v = gt
Substitute 8.75 s for t and 9.8 m/s² for g in the above equation.
v = 9.8 x 8.75
v = 85.75 m/s
Question #8. Don’t pay attention to question number 9 it’s only there because I couldn’t crop it out
Answers
Given:
The distance traveled towards the north is d= 12 km
The velocity is v = 6.5 km/h
To find: the time
Explanation:
The formula to calculate time is
\(\begin{gathered} v=\frac{d}{t} \\ t=\frac{d}{v} \end{gathered}\)Substituting the values, the time will be
\(\begin{gathered} t=\text{ }\frac{12}{6.5} \\ =1.86\text{ h} \end{gathered}\)Final Answer: The time taken is 1.86 h
True or false, anything can turn into a black hole.
Answers
Answer:
False. Not everything can turn into a black hole. The formation of a black hole requires a massive object, typically a star, to collapse under its own gravity. This collapse causes the object to become so dense that it creates a singularity, a point of infinite density at the center of the black hole, which is surrounded by an event horizon, the point of no return beyond which nothing, not even light, can escape. So, only objects with sufficient mass and gravity can become black holes.
Explanation:
what are the advantages of using alcohol instead of mercury in a thermometer
Answers
Answer:
Advantages. It is suitable to measure low temperatures because of its freezing point is low. It is less toxic than mercury thermometer and hence high on safety factor for human and environment. It has a greater value of temperature coefficient of expansion than a mercury thermometer.
Which of the following describes a chemical change?
Question 7 options:
a.)bending a wire
b.)freezing water
c.)melting ice
d.)burning paper
PLEASE HELP ME!!!!!
Answers
Answer:
D. Burning paper
Explanation:
physical change is just changing the way it looks
chemical change is changing the properties of the object or thing
melting ice is just changing the way it looks it still has the same atoms and elements.
when you burn something it will change the properties of the atoms in the object
Where does the pendulum have 100 J of potential energy?
Answers
Answer:
Potential energy is related to mass and height. More context is required otherwise the answer here is an equation with several unknowns. PE = mgL(1 – COS θ) where θ is the angle away from the vertical and L is the length of the string.
Explanation:
a.) Using Earth's estimated cratering rate of Ncum (D > 22.6 km) = 1.8 x 10-15 craters/km2/yr, and a power law exponent b = 1.8 (see your class notes), compute the size of the largest crater likely to have formed in Sweden (area ≈ 450,000 km2) since the formation of its surface rocks ~2000 Myr ago. How does this compare to the size of the putative Uppland structure?
b.) Calculate the probability that a crater as large as Uppland would have formed in the past 2000 Myr. Note that the largest confirmed crater in Sweden is the 55 km-diameter Siljan structure
Answers
a) The size of the largest crater likely to have formed in Sweden since the formation of its surface rocks is approximately 63 km in diameter.
b) The probability that a crater as large as Uppland would have formed in the past 2000 Myr is very low, likely less than 0.01%.
a) Using the given equation N(D) = Ncum(Dref) * (D/Dref)^-b, where Dref = 22.6 km and Ncum = 1.8 x 10^-15 craters/km^2/yr, we can calculate that the expected number of craters with diameter > 63 km in Sweden since the formation of its surface rocks is approximately 0.0005.
Assuming that only one such crater would form, the maximum size of the largest crater is around 63 km in diameter.
b) The probability that a crater as large as Uppland would have formed in the past 2000 Myr can be estimated using the Poisson distribution. Based on the expected number of craters with diameter > 55 km in Sweden (0.002), the probability of at least one such crater forming in 2000 Myr is very low, likely less than 0.01%.
Therefore, the Uppland structure is likely not a meteorite impact crater.
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Differences between Pascal's Law & Law of flotation
Answers
Answer:
Pascal's principle states that pressure increases by the same amount throughout an enclosed or confined fluid. Archimedes' principle states that the buoyant force acting on a submerged object is equal to the weight of the volume of fluid displaced by the object.
if the electric field has a magnitude of 460 n/c and the magnetic field has a magnitude of 0.18 t , what speed must the particles have to pass through the selector undeflected?
Answers
Speed that must the particles have to pass through the selector undeflected2.5×103 m/s
Given
Electric field=460N/C
Magnetic field=0.18T
Then velocity,
v=E/B
=460/0.18
=2555.5=2.5×103 m/s
Charged particle motion in an electric and magnetic field.
F = q(v x B) .
Due to its direction towards the particle's circular motion, the magnetic force in this instance transforms into centripetal force. Therefore, the particle follows a circular route if the field and velocity are perpendicular to one another charged particle's movement within an electric and magnetic field. The magnetic force is perpendicular to the particle's velocity when a charge is moving through a magnetic field. Therefore, no effort is done, and the magnitude of the velocity is not modified (though the direction of momentum may be changed).
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A student pushes a 50-N box across the floor a distance of 15 m. How much work was done to move the box?
1) 750 j
2) 75 J
3) no work was done
4) 7500 J
Answers
Answer:750
Explanation:
50 times 15
Answer:
750 j
Explanation:
I took the test in k12