Answer:
I think sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound. If you are sitting in a space ship and another space ship explodes, you would hear nothing.
Explanation:
Potassium loses electrons when it reacts with oxygen. Which statement is true of potassium in this reaction? A. It reduces. B. It undergoes synthesis. C. It undergoes redox. D. It oxidizes.
Answer: d
Explanation:
Katie is ill with the flu. She immediately contacts her teacher to get the
reading assignments that she will miss. Which type of coping mechanism is
this?
A. Considering others
B. Rumination
C. Planning
D. Blaming
Answer: Planning
Explanation: cause i got it right
C. Planning.
This is because she contacts her teacher to get the assignments so she can do them while she is sick at home. She is PLANNING ahead.
what will happen if you reverse the connction of the coil on a electro magnet I will give Brainliest
Answer:
Explanation: The poles of an electromagnet can even be reversed by reversing the flow of electricity. If a wire carrying an electric current is formed into a series of loops, the magnetic field can be concentrated within the loops. All of their little magnetic fields add together, creating a stronger magnetic field.
A motorcyclist is moving 24.5 m/s
away from a stationary siren, and
hears an 894 Hz sound. What is
the frequency of the siren when the
cyclist is stationary?
(Hint: 894 Hz is the Doppler-shifted
frequency)
(Speed of sound = 343 m/s)
(Unit = Hz)
w
Answer:962 hz
Explanation: got it right on acellus
The frequency of the siren when the cyclist is stationary will be 963 Hz.
What is frequency ?The frequency of a wave is the number of cycles per second.
FRom the doppler effect,
f =f'[ (V+Vs/V-Vo) ]
Here, doppler shifted frequency f' = 894 Hz, Source is stationary, Vs =0. Velocity of observer Vo = 24.5m/s and velocity of sound wave V = 343m/s
Substitute the value into the expression , we get
f = 894 x [(343/343 - 24.5)}
f = 963 Hz
Thus, the frequency of the siren when the cyclist is stationary is 963 Hz.
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Which of the following statements describes the law of inertia?
O A. The force of friction on an object is proportional to the normal
force.
O B. Objects remain in the same state of motion unless a force acts on
them
O c. For every action force there is an equal and opposite reaction
force.
D. Net force is equal to mass times acceleration
Answer:
B. objects remain in the same state of motion unless a force acts on them
Explanation:
Sana nakatulong
Answer: B) objects remain in the same state of motion unless a force acts on them
Explanation:
Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The net force on a body = mass of object × acceleration of the object
The first option "Objects remain in the same state of motion unless a force acts on them" is an implication of the first law of motion .
The second option "For every action force there is an equal and opposite reaction force" is an implication of the third law of motion.
The last option from the given list "Net force is equal to mass times acceleration" is an implication of the second law of motion.
do fish get thirsty????
A 1.8-kg object is attached to a spring and placed on frictionless, horizontal surface. A force of 40 N stretches a spring 20 cm from its equilibrium position (the origin of the x axis). The object is now released from rest from this stretched position, and it subsequently undergoes simple harmonic oscillations. a) Find the force constant of the spring. b) Find the total energy of the oscillating system. c) Where will the object be from the equilibrium position when its velocity is -2.0 m/s (negative 2 m/s)
Answer:
a) k = 200 N/m
b) E = 4 J
c) Δx = 6.3 cm
Explanation:
a)
In order to find force constant of the spring, k, we can use the the Hooke's Law, which reads as follows:[tex]F = - k * \Delta x (1)[/tex]
where F = 40 N and Δx =- 0.2 m (since the force opposes to the displacement from the equilibrium position, we say that it's a restoring force).Solving for k:[tex]k =- \frac{F}{\Delta x} =-\frac{40 N}{-0.2m} = 200 N/m (2)[/tex]
b)
Assuming no friction present, total mechanical energy mus keep constant.When the spring is stretched, all the energy is elastic potential, and can be expressed as follows:[tex]U = \frac{1}{2}* k* (\Delta x)^{2} (3)[/tex]
Replacing k and Δx by their values, we get:[tex]U = \frac{1}{2}* k* (\Delta x)^{2} = \frac{1}{2}* 200 N/m* (0.2m)^{2} = 4 J (4)[/tex]
c)
When the object is oscillating, at any time, its energy will be part elastic potential, and part kinetic energy.We know that due to the conservation of energy, this sum will be equal to the total energy that we found in b).So, we can write the following expression:[tex]\frac{1}{2}* k* \Delta x_{1} ^{2} + \frac{1}{2} * m* v^{2} = \frac{1}{2}*k*\Delta x^{2} (5)[/tex]
Replacing the right side of (5) with (4), k, m, and v by the givens, and simplifying, we can solve for Δx₁, as follows:[tex]\frac{1}{2}* 200N/m* \Delta x_{1} ^{2} + \frac{1}{2} * 1.8kg* (-2.0m/s)^{2} = 4J (6)[/tex]
⇒ [tex]\frac{1}{2}* 200N/m* \Delta x_{1} ^{2} = 4J - 3.6 J = 0.4 J (7)[/tex]
⇒ [tex]\Delta x_{1} = \sqrt{\frac{0.8J}{200N/m} } = 6.3 cm (8)[/tex]
Tin is more active than lead.
O A. True O B. False
Answer:
It would be false
Explanation:
Lead is more reactive if thats what you mean
What is the smallest organism?
An automatic clothing drier spins at 51.6 rev/min. If the radius of the drier drum is 30.5cm, how fast (in m/s) is the drier drum moving
Answer:
1.648 m/s
Explanation:
1 revolution equals 2pi radians.
Calculate the angular velocity by taking 2pi x v, then divide by 60 seconds.
To convert this to m/s, simply take this answer and multiply it by 0.305m (a.k.a. the radius of the circle).
1 revolution is equals 2pi radians. The drier will move 1.648 m/s.
Thus, v = 51.6 rev/ min.
1 revolution = 2 pi radians.
Angular velocity = 2 pi (v)/ 60
= 2 *3.14 * 51.6/ 60
= 5.404 rad/ seconds.
r = 30.5 cm = 0.305 m
v= ( 5.40) ( 0.305)
v= 1.648 m/s.
Thus, 1 revolution is equals 2pi radians. The drier will move 1.648 m/s.
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A football player with a mass of 100kg runs at a rate of 10m/s. What is the momentum?
Answer:
1,000KG*M/S
Explanation:
P=M*V
100KG*10M/S=1,000KG*M/S
An object with a mass of 14 kg accelerates at a rate of 6.2 m/s^2. Calculate
the force required to produce this acceleration.
Answer:
86.8N is the correct answer
pedro uses a bar magnet to pick up a nail. He then
touches the tip of the nail to some staples.
Why do some of the staples stick to the nail?
The nail and the bar magnet are now both permanent
magnets.
The nail has become a temporary magnet, while the
bar magnet remains a permanent magnet.
O The nail has become a permanent magnet, while the
bar magnet has become a temporary magnet.
The nail and the bar magnet are now both temporary
magnets.
Answer:
B
Explanation:
bababooey
B) The nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
What is single touch method of making a magnet?Single touch method is one of various ways of making a magnetic material like soft iron into a magnet.
In this method one end of the magnet (say north pole) is placed at one end of the iron piece and then rubbed over the bar from end to other, then lifted and brought back to first end.
According to the question,
The nail will stick to the bar magnet because it will become magnetized. The presence of the nearby north pole rearranges the magnetic domains inside the steel so that their south poles all point toward the north pole of the permanent magnet.
As a result, the other end of the nail becomes a north pole.
If you bring a bar magnet close to the first iron nail, you can lift the the first iron nail with the magnet and also it will attract and lift the second iron nail.
To attract or even lift the third magnet will depend on the distance.
Hence , the nail has become a temporary magnet, while the bar magnet remains a permanent magnet.
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1. A temperature of 162 °F is equivalent to what temperature in kelvins?
(a) 373 K
(b) 288 K
(C) 345 K
(d) 201 K (e) 308 K
345k
Because the formula for our Fahrenheit is Kevin = 5 * (°Fahrenheit + 459.67)
9.
write short note : power
Answer:
In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.
SI unit: watt (W)
Derivations from other quantities: P = E/t; P = F·v; P = V·I; P = τ·ω
In SI base units: kg⋅m2⋅s−3
Answer:
As a student, what are your insights about this lesson? Write an essay on your
toughts about the types of drugs/subtance of abuse, discussing its description and
effects
if up is up and down is down isn't downside up , upside down
Answer:
No they arent because they are opposite to each other.
Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is sensitive enough to detect a signal which lays down only 0.95 pW of power on an area of 6.1 × 1017 m2. (a) What would be the total power that would be received by the antenna, assuming that its diameter is 380 m? (b) What would be the power of a source at 17000 ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year.
Answer:
Explanation:
Oh sorry I thought I knew this one I guess not but you can prob look it up on safari
The total power received by the antenna is 2.14 × 10^-14 W, and a source at a distance of 17000 ly would need to emit a power of 1.35 × 10^-26 W to provide a signal that could be detected by the radio telescope.
What is a radio wave?A radio wave is a type of electromagnetic wave with a frequency between about 3 kHz and 300 GHz. Radio waves are used for a variety of purposes, including communication, broadcasting, and radar. They are produced by oscillating electrical charges, and can travel through air and other materials, including space.
Radio waves are characterized by their frequency and wavelength. The frequency of a radio wave is the number of cycles per second, measured in hertz (Hz). The wavelength is the distance between two adjacent peaks of the wave, and is inversely proportional to the frequency. Radio waves with lower frequencies have longer wavelengths, while those with higher frequencies have shorter wavelengths.
Radio waves can be generated by a variety of sources, including antennas, electrical circuits, and certain types of electronic devices. They are used for communication between devices, such as radios and cell phones, as well as for broadcasting television and radio signals. Radio waves are also used for remote sensing, including radar and satellite communication.
Here in the Question,
(a) The power per unit area received by the antenna is given by:
P/A = 0.95 pW / 6.1 × 10^17 m^2
The total power received by the antenna is equal to the power per unit area multiplied by the area of the antenna:
P = (P/A) × π(0.5d)^2
where d is the diameter of the antenna. Substituting d = 380 m, we get:
P = (0.95 pW / 6.1 × 10^17 m^2) × π(0.5 × 380)^2
P = 2.14 × 10^-14 W
Therefore, the total power received by the antenna is 2.14 × 10^-14 W.
(b) To find the power of a source at 17000 ly distance that could provide such a signal, we need to consider the power spreading over the surface of a sphere with a radius of 17000 ly. The power density of the signal decreases with the square of the distance from the source, so the power received by the antenna from a source at a distance of 17000 ly is:
P = P0 × (d0 / d)^2
where P0 is the power emitted by the source, d0 is the distance from the source to the antenna (i.e., 17000 ly), and d is the diameter of the antenna.
Substituting the values given, we get:
P = (0.95 pW / 6.1 × 10^17 m^2) × π(0.5 × 380)^2 × (17000 × 9.461 × 10^15 m / 380 m)^2
P = 1.35 × 10^-26 W
Therefore, a source at a distance of 17000 ly would need to emit a power of 1.35 × 10^-26 W to provide a signal that could be detected by the radio telescope.
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Two resistors of resistance 19 each are connected in series. A potential difference of 10 V is then
applied across the resistors. What is the resulting current through the resistors?
Two resistors of resistance 19 ohm each are connected in series.
In series combination, equivalent resistance = 19+19 = 38 ohm
Potential difference = 10 V
V/I = R
I ( current ) = V/R = 10 V / 38 ohm = 0.26 ampere
On a distance-time graph, what is shown when the curve is flat going from left to the right?
A. a negative speed
B. no speed
C. a positive speed
D. It does not mean anything.
Answer:
The aswers is C
Explanation:
For a satellite to orbit Earth at a constant distance, its centrifugal acceleration
must be equal and opposite Earth's gravitational acceleration. If a satellite is
to orbit at a constant distance from Earth at a circular radius of 8,300,000 m,
what is the required velocity of the satellite? (Assume the acceleration due to
Earth's gravity is 5.6 m/s2 at this altitude.)
A. 7043 m/s
B. 8239 m/s
C. 7576 m/s
D. 6818 m/s
If a satellite is to orbit at a constant distance from Earth at a circular radius of 8,300,000, the required velocity of the satellite is 8239m/s.
What is a satellite?
Most spacecraft, with the exception of passive satellites, contain a means of generating electricity for the technology they carry, such as solar panels or radioisotope thermoelectric generators (RTGs). The majority of satellites also feature transponders, which are a type of ground station communication system. The most common satellites, small CubeSats, use a standardised bus to reduce costs and labour. Satellites of a similar type can cooperate with one another to form constellations.To know more about satellite, click the link given below:
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Answer:
3. Which of the following is NOT fluid?
Ice
Air
Water vapor
Liquid ice
Answer:
4. If you filled a balloon on Earth and brought it to the moon, it would ________.
Expand
Shrink
Stay the same size, with the same internal pressure
Stay the same size but with different internal pressure.
Answer:
5. Which of the following is the largest in number?
Air molecule son your lungs
Grains of sand on earth
Stars in the galaxy
Insects alive on the planet
Answer:
3. Ice.
4. Stay the same size but with different internal pressure.
5. Stars in the galaxy
Explanation:
Hope it helped!!
Explain the importance of resistors in a circuit. Cite some instances to prove this example.
Let x define the position of an object such that x =
[tex](3 {t}^{2} + 2t + 10)[/tex]
m
where "t" is in seconds.
(i) What are the positions of the objects at t = 0, 1, 2, 3, 4 and 5
(ii) What is also the average speed between t = 0 and t = 2
Which wave type could move in the empty space between the Sun and the Earth
Answer:
Electromagnetic waves
Which performers can benefit from a protein-rich diet?
A. Tennis players, golfers
B. Swimmers, footballers
C. 3000m runner, long-distance runner
D. Weight lifters, Sprinters
Answer:
in my opinion its A
Explanation:
A cardboard box has four forces acting upon it, as shown in the diagram below. What is the magnitude of the unknown force, Funknownacting on the box if the box is accelerating at 2.0 m/s 2 to the right?
(Answer choices)
A. 5N
B.6N
C.10 N
D. 11N
According to Newton's law of cooling, the rate at which an object's temperature changes is directly proportional to the difference in temperature between the object and the surrounding medium. If T(t) represents the temperature of the object (CC) at time t (in hours), and T5 represents the constant temperature of the surrounding medium, then the differential equation best describing the rate of change in the temperature of the object is:
Answer:
dT(t)/dt = k[T5 - T(t)]
Explanation:
Since T(t) represents the temperature of the object and T5 represents the temperature of the surroundings, according to Newton's law of cooling, the rate at which an object's temperature changes is directly proportional to the difference in temperature between the object and the surrounding medium, that is dT(t)/dt ∝ T5 - T(t)
Introducing the constant of proportionality
dT(t)/dt = k[T5 - T(t)]
which is the desired differential equation
Answer:
dT/dt = k[T5 - T]
Explanation:
DT/dt represents rate of change in temperature for Celsius degrees per hour. Its proportional to the difference in temperature between the object and the Surrounding medium. This means either dT/Dt =k (T-TS) or dT/dt=k(TS-T) with k being some positive constant of proportionality which depends on the object.
We can see that dT/dt = k(T-T5) has temperature increasing when the temperature of the object T is greater than the surrounding medium (T5).
The equation dT/dt=k(T5-T) has the temperature increasing when the object (T) is less than the temperature of the surrounding medium. Therefore the differential equation best describing the rate of change in temperature of the object is dT/dt=k(T5-T) for some positive constant of proportionality k.
As shown, the two charges are 3 cm apart. What will happen to this force if the distance between the charges is doubled? Use proportional reasoning to find the answer and then check by moving the charges.
Answer:
if the distance between the two charges is doubled, the attraction or repulsion becomes weaker, decreasing to one-fourth of the original value. If the charges come 10 times closer, the size of the force increases by a factor of 100. The size of the force is proportional to the value of each charge.
When charges are 3 centimeters apart if the distance between the charges is doubled, the force between them is reduced by a factor of four.
What is Coulomb's Law?Coulomb's law can be stated as the product of the charges and the square of the distance between them determine the force of attraction or repulsion acting in a straight line between two electric charges.
F= k Q₁Q₂/r²
Where F is the force between two charges
As given in the problem, the two charges are 3 centimeters apart, then we have to find out what will happen to this force if the distance between the charges is doubled.
As per Coulomb's law, the force is inversely proportional to the square of the distance between charges.
Thus, the force between them is reduced by a factor of four.
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Which device helps safely transmit electricity from the power plant to your
home?
Answer:
A. Transformer
Explanation:
it’s correct
If 0.5 A is flowing through a household light
bulb and the bulb is plugged into a 120 V
outlet, what is the bulb’s power output?
Answer:
60W
Explanation:
P=IV=0.5x120
P =60W