Answer:
Reflection of light means the bouncing back of light in another direction after hitting a smooth polished surface
laws of reflection1) Angie of incidence is equal to the angle of reflection
2) The nornal ray, reflected ray and the incident ray all lie in the same plane
A string 1.30 meters in length is oscillating in its first harmonic. The frequency of
oscillation is 7.80 Hz. What is the wavelength of the first harmonic?
Answer:
2.6m
Explanation:
The formula for calculating the wavelength is expressed as;
λ = v/f
v is the velocity
f is the frequency of vibration
Given
f = 7.80Hz
We need to get the velocity
For string;
f = V/2L
7.80 = V/2(1.3)
7.80 = V/2.6
V = 2.6 * 7.8
V = 20.28m/s
Get the required wavelength
λ = v/f
λ = 20.28/7.80
λ = 2.6m
Hence the wavelength of the first harmonic is 2.6m
Water in a tank which is positioned 5 feet above the ground is _____ potential energy? (answers would be like thermal, electric, mechanical)
Answer:
Mechanical
Explanation:
The tank is at rest. And energy of any substance at rest is known as potential energy.
Now, in forms of energy, potential energy is a type of mechanical energy.
Thus, the correct option is mechanical Energy.
Look up how much power a typical light bulb uses/produces. Then look up how much power a typical microwave uses/produces. How do these appliances compare to your physical activities?
The current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.
Energy dissipated by electrical applianceThe amount of energy dissipated by an electrical appliance is the calculated using the following formulas;
P = I²R
where;
P is powerI is currentR is resistanceThe current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.
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How can we create a new element by combining all the other elements
Answer:
In order to create a new element you have to change the number of protons in a nucleus.
PLS i really need help.
•you decided to play Flick the coin with your friend. The goal of the game is to flick the coin from the top of a table and let it land of the floor as far as possible. The coin that you flicked left the table (0.8m high) with an initial velocity of 5m/s. Compute the following.
A. Time It will take for the coin to reach the ground.
B. Range (how far from the base of the table will the coin land.with solution
Answer:
A) The time taken by the coin to reach the ground will be 0.4 seconds
B) Range of the motion of the coin will be 2m
Explanation:
This is a case of horizontal projectile motion as there's no initial vertical velocity given to the coin and has only horizontal velocity initially.
According to the equations of Horizontal projectile
[tex]Sy=\frac{1}{2} *g*t^2[/tex] {[tex]Sy =[/tex] Vertical distance traveled , [tex]g=[/tex] acceleration due to gravity of Earth , [tex]t=[/tex] time of flight i.e time taken)[tex]Sx= Vx*t[/tex] ([tex]Sx=[/tex] Range of the projectile ,[tex]Vx=[/tex] initial horizontal velocity, [tex]t=[/tex] time of flight)Given :
Vertical distance to be traveled ([tex]Sy[/tex])= 0.8m
Initial horizontal velocity ([tex]Vx[/tex])= 5m/s
For calculations, we will take acceleration due to gravity ([tex]g[/tex]) to be [tex]10 m/s^2[/tex]
A) Putting values in equation [tex]Sy=\frac{1}{2} *g*t^2[/tex]
⇒ [tex]0.8=\frac{1}{2} *10*t^2[/tex]
⇒[tex]\frac{1.6}{10} =t^2[/tex]
⇒ [tex]\sqrt{0.16} =t[/tex]
⇒ [tex]0.4=t[/tex]
Therefore, time taken by the coin to reach the ground is 0.4 seconds
B) Now using t= 0.4s putting values in equation [tex]Sx= Vx*t[/tex]
⇒[tex]Sx=5*0.4[/tex]
⇒[tex]Sx=2[/tex]
Hence , Range of the coin is 2m
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How many moles are there in 321g of silver hydroxide?
Answer:
2.5705594546378 mol
Explanation:
Used this calculator
http://www.endmemo.com/chem/mmass.php
pls helppp :)List several examples of applied force, normal force, and friction that you’ve observed in your life.
ill mark brainliest if the answer is actually helpful:p
Answer:
an example for applied force is
Explanation:
The applied force is the force applied to the object to either displace it or change its shape.
HOPE THIS HELPS
The coach of the Philadelphia Eagles walks back and forth along the sidelines of Lincoln Financial Field fifteen times in three minutes. What is the frequency of his pacing? Remember to change the time to seconds.
This distance from the Earth to the Sun given above is a standard for measuring other distances in the solar system and is called an Astronomical Unit or AU. 1AU=_________miles. Write this as a ratio:_________
Answer:
The Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex], the ratio of Astronomical Units per mile is [tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].
Explanation:
The distance from the Earth to the Sun is approximately [tex]92.96\times 10^{6}\,mi[/tex], then the Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex]. The ratio can be described by the quantity of miles per Astronomical Unit, then we define:
[tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].
What is the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on earth? What is it on the moon (g = 1.6 m/s2)?
Answer:
to find the weight, use the following formula
F= m x g
in Earth---> 45 x 9.8= 441 N
in Moon---> 45 x 1.6= 72 N
Explanation:
I HOPE THIS HELPS!!! :)
The change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.
What is Gravitational Potential energy?
Gravitational potential energy is defined as the energy possessed by or acquired by an object due to a change in its position when it is present in a gravitational field. This can be said that gravitational potential energy is the energy which is related to the gravitational force or gravitation.
Gravitational potential energy is expressed as
U=m g h
Where, U = gravitational potential energy
m = mass
g = gravitational field
h = height
For above given example,
The change in gravitational potential energy for Earth
mass= 45kg
Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m
g= [tex]9.8m/s^2[/tex]
U= 45*16*9.8 = 7056J or 7.056kJ
The change in gravitational potential energy for Moon
mass= 45kg
Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m
g= [tex]1.6m/s^2[/tex]
U= 45*16* 1.6= 1152J or 1.152kJ
Thus, the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.
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If the ___ of a material are lined up, the object will be magnetic.
Answer please
will mark brainliest if right
Answer:
Atoms
Explanation:
explain newton's second law of motion
Answer: Newtons second law of motion: the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Explanation:
Hope this helps you! Have a good day!
Answer:
Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Example:Newton's Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass. Your leg muscles pushing pushing on the pedals of your bicycle is the force.
Explanation:
~Hope this helps
why don't you have to make your heart beat?
Answer:
Some muscles in the body are “involuntary”, which means you can't control them. The heart is made of a special involuntary muscle called cardiac muscle, and this muscle is made up of cells called cardiomyocytes (which literally means “heart muscle cells” in Latin)
Which of the following is true of alternating current? Select all that apply.
- The net position of the electrons remains the same.
- Electrons always flow in one direction.
- Electrons reverse direction periodically.
- It waveform is the sine wave.
Answer:
The correct option is (C).
Explanation:
Electric current can be direct or alternating.
The direct current flows only in one direction. It is unidirectional.
The alternating current or an C current reverse its direction periodically.
So, the correct statement regarding the alternating current is (c) i.e. Electrons reverse direction periodically.
A wheel initially rotating at 12 rad/s decelerates uniformly to rest in 0.4 s. If the wheel has a rotational inertia of 0.5 kg.m², what is the magnitude of the torque causing this deceleration? (A) 1.5 N.m (B) 15 N.m (C) 30 Nm (D) 38 Nm
Answer:
(B) 15 N.m
Explanation:
The deceleration of the wheel is first found by using the following formula:
[tex]\alpha = \frac{\omega_f - \omega_i}{t}[/tex]
where,
α = angular acceleration = ?
ωf = final angular speed = 0 rad/s
ωi = initial angular speed = 12 rad/s
t = time = 0.4 s
Therefore,
[tex]\alpha = \frac{0\ rad/s - 12\ rad/s}{0.4\ s}\\\\\alpha = -30\ rad/s^2[/tex]
here, the negative sign shows deceleration.
Now, we find the torque responsible for this deceleration:
[tex]\tau = I\alpha[/tex]
where,
τ = torque = ?
I = rotational inertia = 0.5 kg.m²
Therefore,
[tex]\tau = (0.5\ kg.m^2)(30\ rad/s^2)\\[/tex]
τ = 15 N.m
Therefore, the correct answer is:
(B) 15 N.m
A +0.0129 C charge feels a 4110 N
force from a -0.00707 C charge. How
far apart are they?
[?] m
Answer:
r = 14.13 m
Explanation:
Given that,
Charge 1 = +0.0129 C
Charge 2 = -0.00707 C
The force between charges, F = 4110 N
We need to find the distance between charges. Let the distance be r. The force between two charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}\\\\4110=\dfrac{9\times 10^9\times 0.0129\times 0.00707}{r^2}\\\\r=\sqrt{\dfrac{9\times 10^9\times 0.0129\times 0.00707}{4110}} \\\\r=14.13\ m[/tex]
So, the distance between charges is equal to 14.13 m.
Answer:
14.13 m
Explanation:
acellus
What is the output voltage?
Answer:
120 volts
Explanation:
The output voltage is the voltage released by a device, such as a voltage regulator or a generator. Voltage regulators maintain constant voltage levels. A conductor carries the output voltage to various destinations, such as homes and businesses.
The noble gas neon is used for filling neon signs. Like other noble elements, it has a full octet (complete outer energy level) of electrons, which makes the gas A. freeze at room temperature. B. react with other gases in the air. C. unlikely to combine with other elements. D. solidify at standard pressure and temperature, chiny pray-colored solid at room
Answer:
C. unlikely to combine with other elements.
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Noble gases are chemical elements with eight valence electrons and as such have a full octet. Some examples are argon, neon, etc.
Hence, the full octet makes the gas (neon) unlikely to combine with other elements.
PLS HELP, WILL GIVE BRAINLIEST
what is the right part of a chemical equation called?
2H2 + O2 ---> 2H2O(what is this part called)
a. chemical equation
b. products
c. reactants
d. yields
Answer:
I'm pretty sure its product.
Explanation:
Hope this helps and have a wonderful day!!!!
5. How many kilowatt-hours of energy would be used by a 40 W bulb that runs for 10 hours every
day during the course of one year?
Answer:
E = 0.4 kWh
Explanation:
Given that,
The power of a bulb, P = 40 W
Time, t = 10 hours
We need to find the energy used by the bulb. Let it is equal to E. So,
[tex]E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh[/tex]
So, 0.4 kWh of energy would be needed.
Answer: 146,000 Wh or 146 kWh
Explanation:
65 days × 10 hours × 40 W = 146,000 Wh or 146 kWh
The table below includes data for a ball rolling down a hill. Fill in the missing data values in the table and determine the acceleration of the rolling ball. Also find the final Acceleration. Please make sure to fill out the table. Thank you sm!
Please help lol I'm not ver good at these ones
Answer:
Following are the responses to the given question:
Explanation:
Please find the attached table.
[tex]\to t= 10\ /sec\\\\ \to v = 15\ m /sec\\\\ \to a= ?\\\\\to a=\frac{v}{t}\\\\[/tex]
[tex]=\frac{15}{10}\\\\=1.5[/tex]
Use the galvanometers to determine the amount and direction of the induced current. Which galvanometer is
indicating a current of 4 mA?
Answer:
Option B
Explanation:
Looking at the 3 galvanometer readings given above, for galvanometer A, the reading is -2 mA.
For galvanometer B, the reading is 4 mA.
While for galvanometer C, the reading is -5 MA
Thus, option B is correct.
Answer:
B, the second picture
Explanation:
edge 2022
What is another term for weak solutions?
A.
supersaturated solutions
B.
concentrated solutions
C.
dilute solutions
D.
saturated solutions
Answer:
c
Explanation:
diluted means weakened
Another term for weak solutions is dilute solution. Thus, the correct option for this question is C.
What is a weak solution?A weak solution may be defined as a type of solution that significantly partially dissociates into its ions in an aqueous solution or water. In contrast, a strong solution fully dissociates into its ions in water.
The concentration of the weak solution is found to be lower as compared to the strong solution. The word dilute also symbolizes the presence of less concentration in any solution.
The main difference between weak and strong solutions is true that for strong solutions we are given a Brownian motion on a given probability space whereas for weak solutions we are free to choose the Brownian motion and the probability space.
Therefore, another term for weak solutions is dilute solution. Thus, the correct option for this question is C.
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What are 3 procedures of having(making) spinners? Help!
Answer:
The bearings are generally ceramic, metal (stainless steel or chrome), and some are hybrids—such as ceramic balls with stainless races and cages.
Explanation:
good luck
Jupiter's gravity is about 2.3 times stronger than Earth's gravity. Calculate the
mass and weight of a scientific instrument if it were on the surface of Jupiter,
given its mass and weight on Earth's surface.
On Earth's Surface
On Jupiter's Surface
Mass
54 ks
A.
B.
Weight
529 N
What is A
What is B
Answer:
Explanation:
There is no change in mass. Therefore, mass = 70 k g
Weight on Jupiter ≈ 1578 N
Which statement is true about Car A?
Car A has a velocity of 40 km/hr
west.
Car A has a velocity of 40 km/hr
east.
Car A has the same velocity Car E.
Car A has a velocity of 40 km/hr.
Answer:
Car A has a velocity of 40 km/hr west.
Explanation:
The velocity of an object is a vector quantity. It has both magnitudes as well as direction.
Arrows are used to show direction.
Car A is moving towards west. Car B is moving towards east-south direction. Car C is moving towards South direction. Car E is moving towards North direction.
So, the correct option is (a) i.e. Car A has a velocity of 40 km/hr west.
Two point sources are simultaneously creating waves with a wavelength of 6 cm. Point X lies between the two sources. It is 9 cm from one source and 15 cm from the other. What wave heights do you expect at point X? A. The waves will never get very high or low. B. The waves may get very high, but will never get very low. C. The waves may get very low, but will never get very high. D. The waves will sometimes get very high and very low.
Answer:
OPTION D (The waves will sometimes get very high and very low) is the answer.
Explanation:
Wavelength = velocity ÷ frequency
As the frequency which measures the number of waves per unit of time is inversely proportional to the wavelength, point X which lies between two sources, and one source is shorter than another, the wave heights at point x will vary as the distances from point X vary too. This means that waves at point X depending on the wave type and source will get very high at times and very low.
Which of these shows the position of the Sun, Moon, and Earth when a full moon phase occurs? (8.7B)
Answer:
Lunar eclipse
Explanation:
Lunar eclipse occurs when Earth comes in between sun and Moon. The moon is either partially or fully blocked and the moon sighting appears to be black from earth since the light rays coming from sun are blocked by Earth. Lunar eclipse occurs only at full moon. The moon is aligned with the position of earth and sun so that they all form a straight line.
The more dense the liquid, the higher the __________ at a particular depth.
Answer:
The higher the pressure
Una mujer de masa m está parada en el borde de una mesa giratoria horizontal de momento de inercia I y radio R. La mesa al principio está en reposo y tiene libertad de moverse alrededor de un eje vertical sin fricción que pasa por su centro. La mujer empieza a caminar alrededor de la orilla en direción de las manecillas del reloj (vista desde arriba) a una velocidad constante v en relación a la Tierra.
a) En qué dirección y con qué velocidad angular gira la mesa?
b) Cuál es el trabajo efectuado por la mujer para poner en movimiento la mesa?
r
[tex]- \frac{mR^2 }{I } \ v[/tex]Answer:
a) w = - [tex]\frac{m r }{I} v[/tex] , b) W = - ½ m_woman R² (1 + m_woman R / I²) v²
Explanation:
a) To solve this exercise, let's use the conservation of angular momentum.
We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved
initial instant. Before starting to move the woman
L₀ = 0
final instant. After starting to move
L_f = I w + m v r
the moment is preserved
L₀ = L_f
0 = Iw + m v r
w = - [tex]\frac{m r }{I} v[/tex] (1)
the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise
b) for this part we use the relationship between work and kinetic energy
W = ΔK
in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables
v = w r
we substitute
W = 0 - ½ I_total w²
I_total = I + m_{woman} R²
W = - ½ (I + m_woman R²) ( [tex]\frac{m_{woman} R}{I} \ v[/tex]) ²
W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²
W = - ½ m_woman R² (1 + m_woman R / I²) v²