Answer:
Angle of incidence
Explanation:
When light is reflected from a surface, the angle of incidence is always equal to the angle of reflection, where both angles are measured from the path of the light to the normal to the surface at the point at which light strikes the surface. This equality is known as the law of reflection.
PHYSICAL SCIENCE
—
WILL GIVE BRAINLIEST IF CORRECT
A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.
If the motor is used for 30s, how much work does it do? (Power: P = W/t)
A. 0.03 J
B. 30 J
C. 960 J
D. 27,000 J
Answer:
Option D
Explanation:
Taking 2020 unit test for edu right now.
A gas has an initial pressure of 50kpa at a temperature of -67°c. calculate
the final pressure of this gas if its temperature is increased to 398°c at a
constant volume.
Answer:
the pressure will be 297.01 kpa
A car is moving with a constant speed of 15 meters per second. What total
distance does the car travel in 90 seconds?
Answer:
1350 meters
Explanation:
this is easy
15 meters per second
90 seconds
90 * 15 = 1350
27 points will mark brainliest if correct
A freeway exit curves with a radius of 30 m and a posted speed limit of 17.5 m/s. What is your radial
acceleration if you take this exit at the posted speed?
A.7.3 m/s2
B.3.5 m/s2
C.1.3 m/s2
D.10.2 m/s2
Answer:
10.2 m/s^2
a=v^2/r
What does it mean to say that the electric current from a wall socket is 120 V AC
state the effect of momentarily touching the conductor with a finger while the charged rod is still near the conductor
[tex]\small\color{blue}{⊱─━━━━━━━━━⊱༻●༺⊰━━━━━━━━━─⊰}[/tex]
state the effect of momentarily touching the conductor with a finger while the charged rod is still near the conductor
If Im Mistaken it Changes Access[tex]\small\color{blue}{⊱─━━━━━━━━━⊱༻●༺⊰━━━━━━━━━─⊰}[/tex]
If you have an insulator that's charged up with a negative charge, and you touch a conductor, the negatively charged excess electrons will move to the conductor until the electrons would rather not move anywhere at all. When this happens, we say that the system has reached equilibrium
[tex]\small\color{blue}{⊱─━━━━━━━━━⊱༻●༺⊰━━━━━━━━━─⊰}[/tex]
-PoliteCat
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[tex]\large\boxed{\text{Together We Go Far!}}[/tex]
Two friends are each driving a car down Highway 101. During a particular 10 s interval, Jodi's car moves at a constant 60 mph. During that same time interval, Julie's car transitions from a speed of 20 mph to a speed of 30 mph. Whose car has the greater acceleration?
Answer:
Julie's car.
Explanation:
The acceleration of an object is equal to the rate of change of velocity. It can be given by :
[tex]a=\dfrac{v-u}{t}[/tex]
Jodi's car moves at a constant 60 mph for 10 s.
Julie's car transitions from a speed of 20 mph to a speed of 30 mph for the same time interval i.e. 10 s.
For Jodi's car, the change in velocity is equal to 0. As a result, its acceleration is equal to 0 m/s².
For Julie's car,
Initial speed, u = 20 mph = 8.9408 m/s
Final speed, v = 30 mph = 13.4112 m/s
Acceleration,
[tex]a=\dfrac{13.4112-8.9408}{10}\\\\a=0.447\ m/s^2[/tex]
It is clear that Julie's car has the greater acceleration than the Jodi's car.
If an object is not accelerating, it can exist in what 2 other states of motion?
Answer:
Friction is a force that acts in a direction opposite to the motion of the moving object.
Friction will cause a moving object to slow down and finally stop.
60 points! Explain how fission can cause damage to living tissue (i.e. what does nuclear energy do to the tissue?)
Answer:
Radiation Released by Fission
When an atom is split, three types of radiation that can damage living tissues are released. ... Ionization is the transfer of energy to the molecules that make up tissue, breaking chemical bonds and causing damage to cells and to DNA.
Explanation:
thanks mark as brainiest,rate the answer
Con el propósito de controlar las variables que influyen en la caída libre se provoca el vacío en la sala de un laboratorio. Si se dejan caer tres esferas, una de plomo, otra de aluminio y la última de plumavit, ¿en qué orden caerán las esferas si son soltadas desde una altura de 5 m?
Answer:
El plomo, el aluminio y la plumavit caerán al mismo tiempo.
Explanation:
En cinemática, la caída libre es un movimiento dónde solamente influye la gravedad. En este movimiento se desprecia el rozamiento del cuerpo con el aire, es decir, se estudia en el vacío.
La caída libre es un movimiento uniformemente acelerado de un cuerpo dónde solamente influye la gravedad y se estudia en el vacío, es decir, se debe despreciar el rozamiento del cuerpo con el aire. Entonces a este movimiento se denomina caída libre ideal. Y en esas condiciones, la aceleración que adquiriría el cuerpo sería debida exclusivamente a la gravedad, siendo independiente de su masa.
Entonces, el plomo, el aluminio y la plumavit caerán al mismo tiempo ya que adquirirían la misma aceleración, g, que es la aceleración de la gravedad.
Some characteristics that are common to metals are that they are good conductors or heat and electricity , are malleable , and are often shiny (Have luster ) in which of the following groups would your expect every element to share these properties
A potassium (K) , chromium (fr) , and tellurium (Te)
B sodium (na), cobalt (Co) , and platinum (Pt)
C ruthenium (Ru) ,cooper (Cu), and radon (rn)
D oxygen (O) fluorine (F) and argon (Ar)
Answer:b
Explanation:
An emission spectrum is: various wavelengths emitted by an excited substance the wavelengths that are removed from a continuous spectrum when it passes through a substance a spectrum that contains only a few discrete wavelengths a spectrum containing all wavelengths the range of wavelengths emitted or absorbed by an object
Answer: Various wavelengths emitted by an excited substance
Explanation:
A boat in the trough of a wave takes 3 seconds to reach the highest point of the wave. The velocity of the wave is 5 m/s. What is its wavelength?
Answer:
wavelength is equal to speed over frequency
A boat in the trough of a wave takes 3 seconds to reach the highest peak of the wave, then its wavelength will be equal to 30 m.
What is Frequency?The frequency of an event is its repetition per time unit. In a contrast to spatial frequency, it is also often referred to as temporal frequency, and in a contrast to angular frequency, it's often referred to as conventional frequency.
The standard unit is hertz (Hz), which is equal to one per second. The reciprocal of frequency is period, which itself is defined as the amount of time for one cycle of a repeating occurrence.
From the given data in the question,
Total time, t = 3s + 3s
t = 6 seconds.
Frequency, f = 1/6s
f = 0.1666 Hz
Now, let's find out the wavelength,
λ = υ/f
= 5/0.1666
λ = 30 m.
Therefore, the wavelength will be equal to 30 m.
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Light waves and sound waves have many similar behaviors, such as reflection and refraction. One behavior they do not share is
Answer:
light waves can travel in vacuum but sound waves require a medium to travel
also light waves are electromagnetic waves while sound waves are mechanical, light waves are transverse waves while sound waves are longitudinal waves
While sound waves are mechanical, light waves are electromagnetic. Unlike sound waves, which are longitudinal, light waves are transverse. Light waves can go across a vacuum. Since sound waves need a physical medium to move through, they cannot move in a vacuum.
What is sound wave?The pattern of disruption brought about by the movement of energy through a medium (such as air, water, or any other liquid or solid matter) as it spreads away from the source of the sound is known as a sound wave. Pressure waves are generated by item vibrations that cause sound waves, such as those from a ringing phone.
Unlike sound waves, which need a medium to propagate, light waves may travel in a vacuum.
Additionally, light waves are transverse waves whereas sound waves are longitudinal waves and light waves are electromagnetic waves.
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An object moves away from the earth. Consider system A: the object alone, and system B: the object and the earth together. The potential energy for system A _____ and the potential energy for system B _____. Group of answer choices increases, (there is no potential energy for system B) increases, increases (there is no potential energy for system A), increases decreases, (there is no potential energy for system B) (there is no potential energy for system A), decreases decreases, decreases increases, decreases decreases, increases
Answer:
1(B) 2(c)
Explanation:
The initial velocity of a ball sent upward from the ground, is 12 m/s. What will its final velocity be before it hits the ground
O 12 m/s
0-12 m/s
0 -9.8 m/s
O 9.8 m/s
Answer:
The final velocity s 12 m/s.
For the upwards trajectory: (using the positive value of g in the downward direction)
Vf = Vi - g t = 0 where Vi is initial velocity and Vf the velocity at max height
Vf = 12 - g t = 0 t = 12 / g time to reach max height
For the downwards trajectory
Vf = Vi + g t = 0 + g t = g * 12 / g = 12 where t was found above
We know the from 2 g h = Vf^2 - Vi^2, since the height is the same in both directions, that the ball reaches the ground with at the same speed at which it was sent.
Also, conservation of energy shows that the ball must return to the ground with the speed with which was projected.
Which is a convex lens? (The blue arrows represent the direction of light as it interacts with the lenses. ).
Image C is a convex lens.An optical lens is made up of two spherical surfaces is convex lens.Its surfaces are curved outwards.
What is convex lens ?An optical lens is made up of two spherical surfaces is convex lens The lens is called a biconvex lens or simply convex lens if those surfaces are curved outwards.
Converging lens is another name for it. It's because it brings all the light rays that are parallel to the primary axis together at the focus point (F).
The picture created by a convex lens is always real and inverted. The produced image is virtual and erect when the item is positioned between the focus and the optical center of the lens.
Hence image C is a convex lens.
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Answer:
C
Explanation:
What is the correct definition of acceleration?
a) the change of velocity over time
b) the change of inertia over time
c) the change of velocity over distance
d) the change of speed over time
Answer:
Hello
a) the change of velocity over time
Answer:
c.the change of velocity over distance
Figure I shows the position of the moon at local time 10:00 P. M with respect to point A on earth’s surface. Figure II shows the position of the moon 24 hours later with respect to the same place. Which phenomenon will a person at point A observe?
Answer:
A
Explanation:
i just did this on usatestprep the answer A
A rolling desk chair has a mass of 8 kg and an initial velocity of 6 m/s. The chair is given an acceleration of 12 m/s² for 3s.
What is the magnitude of the net force on the chair during acceleration?
96 N
48 N
144 N
288 N
Work is the application of force to move an object. It is proportional to both the force applied to the object and the distance it moves.
Net force = 96 N.
What is the relationship between work force and distance?Work is the application of force to move an object. It is proportional to both the force applied to the object and the distance it moves. This equation can be used to calculate work: Work = Force x Distance.The work done by a force of constant magnitude working in the strict direction of the object's velocity (however that changes) is magnitude of force times distance travelled.Positive Work : If a force moves an object in its direction, the work done is positive.Negative Work: Work is said to be negative if the force and displacement are in opposite directions.Mass m = 8 kg
Initial velocity = 6 m/s
Acceleration a = 12 m/s²
Time = 3 s
v = u + at
v = 6 + (12)(3)
v = 42 m/s
Work done = (1/2)(8)(42² - 6²)
Work done = 6,912
s = ut + (1/2)(a)(t)²
s = (6)(3) + (1/2)(12)(3)²
s = 18 + 54
Displacement (s) = 72 m
Net force = Work done / Displacement
Net force = 6,912 / 72
Net force = 96 N
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Find the formula for terminal velocity and define each of the variables in the equation.
When the object falls through a viscous fluid with terminal velocity the total downward force becomes equal to total upward force
[tex]\\ \rm\rightarrowtail mg=U+F_v[/tex]
[tex]\\ \rm\rightarrowtail mg=m_1g+6\pi \eta rv_T[/tex]
[tex]\\ \rm\rightarrowtail (m-m_1)g=6\pi \eta rv_T[/tex]
[tex]\\ \rm\rightarrowtail v\rho g=6\pi \eta rv_T[/tex]
[tex]\\ \rm\rightarrowtail \dfrac{4}{3}\pi r^3(\rho-\sigma)g=6\pi\eta rv_T[/tex]
[tex]\\ \rm\rightarrowtail v_T=\dfrac{4gr^2(\rho-\sigma)}{18\eta}[/tex]
[tex]\\ \rm\rightarrowtail v_T=\dfrac{2}{9}\dfrac{gr^2(\rho-\sigma)}{\eta}[/tex]
[tex]\eta[/tex] is viscosityr is radius of tubev_T is terminal velocitym is mass[tex]\rho [/tex]is density of object[tex]\sigma[/tex] is density of fluidg is acceleration due to gravityA +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a -3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric field at either of the two unoccupied corners? *
With the charges of the square as +2.0-nC point charge and -3.0-nC point charge, The magnitude of the electric field is mathematically given as
Et= 14.42 N/c
What is the magnitude of the electric field at either of the two unoccupied corners?Question Parameters:
A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a -3.0-nC charge
Generally, the equation for the electric field is mathematically given as
E = k*q1/a^2
Therefore
E1= 9*10^9*2*10^-9/1.5^2
E1= 8 N/c
For E2
E2= 9*10^9*3*10^-9/1.5^2
E2= 12 N/c
In conclusion, The magnitude of the electric field at either of the two unoccupied corners
[tex]Et = \sqrt{E1^2 + E2^2}[/tex]
Et= 14.42 N/c
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12. A dragster accelerates to a speed of 112 m/s over a distance of 398 m. Determine the acceleration
(assume uniform) of the dragster.
Which mathematically describes the wave properties of electrons?.
Answer:
On Waves. Quantum mechanically, an electron can be described by a wave function oscillating in space and time that has mean values equal to the expectation values of observables corresponding to given operators. ... Electrons are fermions. They are charged particles. in short the quantum theory
i hope its helpful !
what is a joule in science? and how does it relate to work? helppp I need an answer!!! (no links)
Answer: joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre.
Explanation:
This is a unit used to measure energy or work. One joule is the amount of energy required to produce one watt of power for one second. It's also the work done by a force equal to one newton exerted over a distance of one meter.
Hope this helps!
Jeff found the key to exit the tower and wanted to give it to Rapunzel. If her hand is 200m above the ground, what is the required velocity for Jeff to toss the key to reach her in m/s?
Answer:
10M/S
Explanation:
DUE TO GRAVITY
Please help I’ll name you brainliest and give five stars please
Answer:
i think its 10 or 11 not sure though if its wrong im sorry im trying to help
Explanation:
h=height
mass
height
Potential Energy
1.23 kg
3.4 m
4.3 m
98.61 Joules
150.45 Joules
3.45 kg
202.94 Joules
6.2 kg
7.1 kg
3.56 m
if his potential energy is 98.61 joules and his height is 4.3m what is his mass?
Answer:
m = 2.34 kg
Explanation:
The given data shows the relation between the potential energy and the height of an object. The formula for the potential energy is given by :
E = mgh
g is the acceleration due to gravity
We have,
E = 98.61 J, h = 4.3 m
Putting all the values to find m. So,
[tex]m=\dfrac{E}{gh}\\\\m=\dfrac{98.61}{9.8\times 4.3}\\\\m=2.34\ kg[/tex]
So, the mass of the object is 2.34 kg.
Elena failed her algebra exam and blames her teacher for teaching the concepts poorly. How would attribution theory explain Elena's behavior?
A. Elena is using situational attribution because she is blaming events that were outside of her control.
B. Elena is using internal attribution because she is blaming events that were within her own control.
C. Elena is making a dispositional attribution because she is assigning her teacher's behavior to her character.
D. Elena is making a fundamental attribution error because she is underestimating her own influence on the situation.
Answer: From What i Seeing it is Option B
A man who weights 900N stands on a platform scale in a elevator. The elevator has a mass of 4000kg; the reading scale is 700N. What is the direction of the net force acting in the man
Hi there!
We know that there are TWO forces acting on the man.
Force due to gravity: Acts DOWNWARDNormal force due to the elevator floor: UPWARDWe can express this in an equation. Let DOWN be NEGATIVE, and UP be POSITIVE.
[tex]F_{net} = N - F_g[/tex]
Recall that a SCALE measures the NORMAL FORCE, NOT the WEIGHT. Therefore:
N = 700 N
W = 900 N
[tex]F_{net} = 700 - 900 \\\\F_{net} = -200N[/tex]
Since downward is negative, the net force is acting DOWNWARD.