Answer:
Option B
Explanation:
The reliability of an experiment can be increased by conducting experiment sufficient number of times keeping other things constant. Hence, the 10 p coin needs to be flipped again to measure reliability for more than one times.
Hence, option B is correct
what is the period of a water wave with a frequency of 0.5 Hz?
Sobre un barco, que se mueve en forma rectilínea, y con velocidad constante de 30 [km/h], se mueve un perro en el mismo sentido del barco a una velocidad de 10 [km/h]. Si alguien observa sentado desde la playa, ¿a qué velocidad verá correr al perro sobre la cubierta del barco?
Answer:
El observador verá correr al perro sobre la cubierta del barco a una velocidad de 40 kilómetros por hora.
Explanation:
Para determinar la velocidad del perro con respecto al observador sentado desde la playa a través del concepto de velocidad relativa, descrito en la siguiente fórmula:
[tex]v_{P/B} = v_{P} - v_{B}[/tex] (1)
Donde:
[tex]v_{P/B}[/tex] - Velocidad del perro relativo al barco, en kilómetros por hora.
[tex]v_{P}[/tex] - Velocidad del perro con respecto al observador, en kilómetros por hora.
[tex]v_{B}[/tex] - Velocidad del barco con respecto al observador, en kilómetros por hora.
Si sabemos que [tex]v_{B} = 30\,\frac{km}{h}[/tex] y [tex]v_{P/B} = 10\,\frac{km}{h}[/tex], entonces la velocidad del perro con respecto al observador es:
[tex]v_{P} = v_{B} + v_{P/B}[/tex]
[tex]v_{P} = 30\,\frac{km}{h} + 10\,\frac{km}{h}[/tex]
[tex]v_{P} = 40\,\frac{km}{h}[/tex]
El observador verá correr al perro sobre la cubierta del barco a una velocidad de 40 kilómetros por hora.
22. White noise is ...
a very loud sound
a single frequency at the same time
a very quiet sound
a whole bunch of frequencies at the same ttim
23: what does the law of conservation of energy state?
both of these
neither of these
energy can be created
energy can be destroyed
Answer:
white noise is a bunch of frequencies at the same time :)
Explanation:
Which statement accurately describes the big bang theory? The universe began at an outer boundary and has been collapsing since its formation.
Answer: The statements are missing hence I will give you a summary of what the big bang theory .
answer : The big bang theory explains how the energies of every speck of the universe came together at a point ( very dense point ) and eventually exploded creating the various galaxies we have today
Explanation:
The Big bang theory describes how the Universe and the various galaxies that exist began some billion of years ago, It describes how the energies of every speck of the universe came together at a point ( very dense point ) and eventually exploded creating the various galaxies we have today
Please help with this question
Answer:
That's true
Explanation:
I've gotten it right
You have just learned that the planet core of Mars is no longer radiating heat like the core of Earth. With this information what would you communicate to building designers as the lead geologist in regards to suitable building locations on the surface of Mars? Remember your informing builders about locations that would best avoid natural disasters like marsquakes and volcanoes? What evidence or theories do you have to support your statements?
Answer:
Explanation:
That is a fun question!
Without a hot radiating core like Earth, Mars will have very different geological and seismic events. The Mars core will be relatively cold and there will not be any molten magma. So Mars will not have earthquakes or volcano activities. Both only occur when there is magma flowing or tectonic plate motion and they will not occur with a cold core.
A spring with a spring constant of 2.5 N/m is stretched by 0.2 m. What is the potential energy in the spring
Answer:
Explanation:
PE = [tex]\frac{1}{2}k[/tex](Δ[tex]x^2[/tex])
where k is the spring constant and Δx is the displacement of the spring when an object is hung from it. Plugging in:
[tex]PE=\frac{1}{2}(2.5)(.2^2)[/tex] which gives us
PE = .05 J
Nathan is walking to the store and sees a snake slithering across the sidewalk. He jumps over it with an initial vertical velocity of 10 ft/s. How long does it take for Nathan to land back on the ground
Answer:
[tex]0.62\:\mathrm{s}[/tex]
Explanation:
Since the universal SI unit for velocity is meters/second, let's convert ft/s to m/s:
[tex]10\:\mathrm{ft/s}=3.048\:\mathrm{m/s}[/tex]
We can use the following kinematics equation to solve this question:
[tex]v_f=v_i+at[/tex]
What we know:
The initial velocity, [tex]v_i[/tex], is [tex]3.048\:\mathrm{m/s}[/tex] (physics concept) The final velocity must be equal in magnitude but opposite in direction to the initial velocity ([tex]v_f=-3.048\:\mathrm{m/s}[/tex]) Acceleration, [tex]a[/tex], is acceleration due to gravity at about [tex]9.8\:\mathrm{m/s}[/tex]Solving for [tex]t[/tex]:
[tex]-3.048=3.048+(-9.8t),\\-6.096=-9.8t,\\t=\frac{-6.096}{-9.8}\approx \boxed{0.62\:\mathrm{s}}[/tex]
How many Americans get sick from consuming contaminated food/water each year
Answer:
48 million people get sick, 128,000 are hospitalized, and 3,000 die
Explanation:
Answer:
48 million is get sick from consuming contaminated food/water each 6ear
If you were capable of converting mass to energy with 100%, efficiency, how much mass would you need to produce 3.5x10^12 Joules of energy?
Answer:
a) 3.9 x 10⁻⁵ kg
Explanation:
The amount of mass required to produce the energy can be given by Einstein's formula:
[tex]E = mc^2\\\\m = \frac{E}{c^2}[/tex]
where,
m = mass required = ?
E = Energy produced = 3.5 x 10¹² J
c = speed of light = 3 x 10⁸ m/s
Therefore,
[tex]m = \frac{3.5\ x\ 10^{12}\ J}{(3\ x\ 10^8\ m/s)^2} \\\\m = 3.9\ x\ 10^{-5}\ kg[/tex]
Hence, the correct option is:
a) 3.9 x 10⁻⁵ kg
Suppose the height of object is +3cm and height of image is -12 cm. What is its magnification?
Answer:
magnification is 4
Explanation:
m= image height / object height
m= 12/3
m= 4
A voltage source provides ____ required for electric current. A. the electrons B. the potential difference C. the resistance D. the pathway
A portion size is always equivalent to the serving size listed on the label. A. True B. False
Answer:
Hi, there your answer is False
Explanation:
Which has more thermal energy, a cup of water at 39°C or a cup of water at 60° C?
Answer:
The cup of water at [tex]60^o C[/tex] has more thermal energy.
Explanation:
Warmer objects have faster particles and higher temperatures. If two objects have the same mass, the object with the higher temperature has greater thermal energy.
Two forces of 8N and 10N CANNOT give a resultant of
a. 1 N
b. 2 N
c. 9 N
d. 18 N
Answer:
Answer is gonna be B. 2N
This is the Answer for your question :3
I hope you are having a great day ❤️❤️❤️❤️
The resultant force is indeed the single force and corresponding tension derived by vector addition when combining any system of torques acting on a solid body.
Its associated torque is generated mostly by the time of filing the compliance.The Pythagorean theorem is being used to determine the resulting force whenever one force acts perpendicularly to another. Calculating the resultant force which not includes force: [tex]\to 10-8= 2\ N[/tex]Therefore, the final answer is "Option b".
Learn more:
brainly.com/question/23869482
How does a circuit breaker protect a refrigerator?
Answer:
When the circuit breaker trips and turns off, it can shut off power to the appliance. This not only protects your home from damage, but it also protects the appliance itself.
Explanation:
What is a circuit breaker. A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.
A nucleus with mass number 229 emits a 3.443 MeV alpha particle. Calculate the disintegration energy Q for this process, taking the recoil energy of the residual nucleus into account.
Answer:
3.504 MeV
Explanation:
Given that;[tex]\frac{A}{Z} X ---->\frac{A-4}{Z-2} Y +\alpha + Q[/tex]
Also;
[tex]Q= KE_{\alpha } (M_{Y} + M_{\alpha } /M_{Y[/tex])
Mass number of X = 229
Mass number of Y = 225
Mass number of alpha particles = 4
Kinetic energy of alpha particles = 3.443 MeV
Q = 3.443 MeV (225 + 4/225)
Q= 3.504 MeV
An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could An object attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could double the mass. double the force constant (spring constant) of the spring. double both the mass and amplitude of vibration. double the amplitude of vibration. double both the amplitude and force constant (spring con
Answer:
double the force constant
Explanation:
For this exercise we see that the unit mass to the spring executes a simple harmonic motion, the maximum mechanical energy is
Em = ½ k A²
where A is the range of motion
To double the energy we must increase the amplitude or the spring constant
Therefore, to double the total energy we must increase the amplitude by an amount √2
or we can increase the spring constant to double
The correct answer is to double the force constant
(reply with an answer to the question or get reported) Please solve it with the steps ty
Answer:
vertical force=50
horizontal force=35
Stars appear to move in circular paths through the sky because ________________________ Group of answer choices The stars orbit Polaris The Milky Way is a spiral galaxy Earth orbits the sun Earth rotates on its axis
Answer:
Earth rotates on its axis
Explanation:
A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.
It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).
Some of the examples of stars are; Canopus, Sun (closest to the Earth), Betelgeus, Antares, Vega etc.
Earth rotation can be defined as the amount of time taken by planet earth to complete its spinning movement on its axis.
This ultimately implies that, the rotation of earth refers to the time taken by earth to rotate once on its axis. One spinning movement of the earth on its axis takes approximately 24 hours to complete with respect to the sun.
As a result of the Earth's rotation on it's axis, stars generally appear to move in circular paths through the sky.
Explain why the poles are colder than the tropics.?
How high can a body vertically thrown with a speed of 40m/s raise after 3 sec (neglecting air
resistance)
y = 75.9 m
Explanation:
y = -(1/2)gt^2 + v0yt + y0
If we put the origin of our coordinate system at the point where a body is launched, then y0 = 0.
y = -(1/2)(9.8 m/s^2)(3 s)^2 + (40 m/s)(3 s)
= -44.1 m + 120 m
= 75.9
Is the crust uniform (the same) in thickness around the world? Explain
Can someone help please
Ans: The velocity of the bobsled at the bottom of the hill is = 57.7 [tex]\frac{m}{s}[/tex]
Explanation: (see image attached)
Hope this helps! Good luck with future work! :)
You need to pick up a book off the floor and place it on a tabletop. You do 1.56J of work to lift the book with a force of 300N. What is the distance?
Answer:
Distance = 0.0052 m
Explanation:
Work =1.56J
Force = 300N
Distance = ?
Work=Force*Distance
1.56 J = 300N * Distance
1.56/300 = Distance
0.0052 m = Distance
A cyclist rides at an average speed of 1.9 m/s for 3h 30min. How many kilometers does he travel
What wave phenomena best describes the reason for the dark and light bands that
appear on the optical screen during the double slit experiment?
Answer:
Interference
Explanation:
Interference is the phenomenon in which two waves superimpose to form a wave with smaller, larger or same amplitude.
There are two types of interference namely, constructive interference and destructive interference.
Constructive interference occurs when the waves are in phase and destructive interference occurs when the waves are out of phase.
In a double slit experiment, the two slits acts as sources of light and thus the waves combine to produce interference patterns. When the waves are in phase, that is the angle between them is 0°, they form a constructive interference pattern which gives rise to a light band. When the waves are out of phase, that is the angle between them is 180°, they form a destructive interference pattern which gives rise to a dark band.
Note also that diffraction patterns are also observed for wide slits but can be neglected for smaller slits.
A 3 kg book is at rest on the table. What is the magnitude of the normal force that the table is exerting on the book?
Answer:
30 N
Explanation:
The normal force is the component of a contact force that is perpendicular to the surface that an object contacts. This normal force prevents the surfaces from penetrating each other.
Let us assume that the acceleration due to gravity (g) is 10 m/s². Hence the weight of the book (W) is:
W = mass of book * acceleration due to gravity = 3 kg * 10 m/s² = 30 N
The normal force ([tex]F_n[/tex]) is gotten using:
Summation of vertical force = m[tex]a_y[/tex]
[tex]F_y=ma_y\\\\F_n-mg=0\\\\f_n=mg=3kg(10m/s^2)=30\ N[/tex]
a 5 kg block is on a frictionless surface. A 15 N force is applied to the block in a direction parallel to the surface. what is the acceleration of the block?
A. 3 m/s^2
B. 10 m/s^2
C. 20 m/s^2
D. 75 m/s^2
Answer:
D 75
Explanation:
I'm pretty sure it's just 5x15=75
Answer:
the answer would be 3/s^2
Explanation:
because all u have to do is divide 15 by 5 and u would get 3
help me calculate the kinetic energy (just the middle column) ASAP! SHOW WORK! ON PAPER
Answer:
Explanation:
I can tell you what the answers for the middle column are, but if you don't know how to solve total energy problems, they won't make any sense to you at all.
First row, KE = 0
Second row, KE = 220500 J
Third row, KE = 183750 J
Fourth row, KE = 205800 J
That's also not paying any attention to significant digits because your velocity only had 1 and that's not enough to do the problem justice. I left all the digits in the answer. Round how your teacher tells you to.