The way a rock reflects light is called the luster of the rock. Hence option B is the correct answer.
What is Reflection?When light rays bounce off one surface, transition from one transparent medium to the next, or proceed through a media whose structure is constantly shifting, they change direction.
According to the law of reflection, the angle of the reflected ray when reflecting from a level surface is the same as the angle of the ray. (By practice, all angles in wave propagation are expressed with regards to the normal to the surface, or to the line that is perpendicular to it.
The light beam and the surface normally establish a plane in which the reflected beam is always located. The pictures created by straight and curved mirrors can be understood using the
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A ball is thrown upward with ten units of momentum initially. What is the “recoil” momentum of the earth? Why do we not feel this?
Answer:
1.) Momentum = 10 units
2.) Because of gravity
Explanation:
According to the Newton 3rd law of motion, we realise that in collision, momentum is always conserved.
So, if a ball is thrown upward with ten units of momentum initially, the “recoil” momentum of the earth will be approximately 10 units of momentum. We do not feel this because of the gravity.
Which statement best explains acceleration?
O A.
It is the total distance covered over a period of time.
B.
It is a change in velocity over a period of time.
Oc.
It is a change in displacement over a period of time.
OD.
It is a change in direction over a period of time.
Answer:
It is a change in velocity over a period of time.
Explanation:
It is measured in metres/second2 using an accelerometer.Remembering the Battle of Bunker Hill what did general Howe and his troops do
Answer:
General Howe and the British regrouped after losing the hill.
Explanation:
British forces marched to Breed's Hill on 17 June under the order of Major General William Howe. When the British Army marched in waves toward the Americans, Colonel William Prescott issued orders to avoid the fire until British troops came to clear sight in an attempt to protect the dwindling supply of ammunition to the Americans. Many British soldiers have been killed or maimed; the remainder has withdrawn down the hill. In a second wave, the British stormed the hill once again but met with the same fate. So they withdrew again, suffering a large number of casualties. Eventually the British took the hill in the third attempt but at a great cost of casualties.
what type of circuit is shown?
open parallel circuit
closed parallel circuit
closed series circuit
open series circuit
Answer:
open series circuit, (c)
Explanation:
Variations to the forehand stroke are not allowed. True False
A golfer is teeing off on a 130.0 m long par 3 hole. The ball leaves with a velocity of 35.0 m/s at 35.0° to the horizontal. Assuming
that she hits the ball on a direct path to the hole, how far from the hole will the ball land (no bounces or rolls)?
Answer:
The ball will land 12.5m before that hole.
Explanation:
The motion of the golf ball can be considered as a projectile motion, where first its height is 0, then it keeps increasing to a maximum point, after which its height starts decreasing again and hits the ground (height becomes 0 again).
We need to calculate the Range (horizontal distance) of the ball which is given as:
[tex]R=\frac{v_i^2{\cdot}sin2\theta}{g}[/tex]
Where
v(i) = initial velocity = 35 m/s
θ = Initial angle = 35°
g = gravitational acceleration = 9.8 m/s
Substitute in the given formula to find Range:
[tex]R=\frac{(35)^2\cdot{sin}(2)(35)}{9.8}\\R=\frac{(1225)(0.94)}{9.8}\\R = 117.5~m[/tex]
Distance between the hole and position where ball lands = 130m - 117.5m = 12.5m
What is the power of a lightbulb that transfers 60 joules of electrical energy in 15 seconds
Answer:
power=[tex]\frac{work done}{time taken}[/tex]
power=[tex]\frac{60joules}{15seconds}[/tex]
power=4J/s
I WILL CHOOSE YOU AS THE BRAINIEST PLEASE ANSWER MY QUESTION
Identify that all objects exert a force of gravity on all other objects in the universe
Answer:
It's like the Earth pulling on you and keeping you on the ground. That pull is gravity at work. Every object in the universe that has mass exerts a gravitational pull, or force, on every other mass. The size of the pull depends on the masses of the objects.
Explanation:
Calculate the wavelength of a nitrogen molecule moving at a speed of 523m/s.
Answer:
The de-Broglie wavelength of the nitrogen molecule is 0.0272 nm
Explanation:
The mass, m, of the nitrogen molecule, N₂ = 14.0076u = 28.0152 × 1.66 × 10⁻²⁷ kg
[tex]v_{rms}[/tex] of N₂ = 523 m/s
The de-Broglie wavelength is given as follows;
[tex]de-Broglie \, wavelength = \dfrac{h}{m\times v_{rms}}[/tex]
Where:
h = Planck's constant = 6.62607004 × 10⁻³⁴ m²·kg/s
Plugging in the values, we have;
[tex]de-Broglie \, wavelength = \dfrac{6.62607004 \times 10^{-34}}{28.0152 \times 1.66 \times 10^{-27}\times 523} = 2.72\times 10^{-11} \, m[/tex]
Hence, the de-Broglie wavelength of the nitrogen molecule = 0.0272 nm.
____ charges are attract each other
Answer:
One positive and one negative
1/25 force of gravity in distance
Answer: 25
Explanation:
A washing machine heats 10kg of water in each wash cycle. How much energy is saved by washing at 30'c instead of 50'c if the starting temperature of the cold water is 16'c? The specific heat capacity of water is 4200 J/Kg'c
The two equations you can use is in the picture.
8.4 × 10⁵ Joules of heat energy can be saved assuming that there is no heat exchange between the washing machine and the environment.
What is Heat energy?Heat energy is the result of movement of tiny particles called as atoms, molecules, or ions in solids, liquids and gas substances. Heat energy can be transferred from one object to another object.
Let m denote the mass of water and the specific heat capacity of water. The energy required to raise the temperature of that much water by would be:
Q = m × c × ΔT
Washing at 30°C would require a temperature change of
ΔT = 30°C - 16°C = 14°C
Washing at 50°C would require a temperature change of
ΔT = 50°C - 16°C = 34°C
In both situations, c = 4.2 × 10³J.kg/ °C while m = 10kg.
Calculate the energy required in either of the situations as:
Washing at 30°C:
Q(30°C) = c × m × ΔT
Q = 4.2 × 10³J.kg/ °C × 10kg × 14°C
Q = 588000 Joules
Washing at 50°C :
Q (50°C) = c × m × ΔT
Q = 4.2 × 10³J.kg/ °C × 10kg × 34°C
Q = 1428000 Joules
1428000 Joules - 588000 Joules = 8.4 × 10⁵ Joules
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Please help me find the last one ASAP! Thanks :))) (You don't have to send the definition)
helpp me pleassee....
Answer:
The fundamental wavelength of the vibrating string is 1.7 m.
Explanation:
We have,
Velocity of wave on a guitar string is 344 m/s
Length of the guitar string is 85 cm or 0.85 m
It is required to find the fundamental wavelength of the vibrating string. The fundamental frequency on the string is given by :
[tex]f=\dfrac{v}{2l}\\\\f=\dfrac{344}{2\times 0.85}\\\\f=202.35\ Hz[/tex]
Now fundamental wavelength is :
[tex]\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{344}{202.35}\\\\\lambda=1.7\ m[/tex]
So, the fundamental wavelength of the vibrating string is 1.7 m.
How much blood does the average adult have
What is the mass of an object that has a weight of 80.0 N?
Explanation:
SUPONIENDO QUE LA ACELERACIÓN DE LA GRAVEDAD ES [tex]9.80 m/s^{2}[/tex]
USANDO LA SEGUNDA LEY DE NEWTON:
m = 80.0 N/[tex]9.80 m/s^{2}[/tex] = 8.16 kg
Answer:
8kg
Explanation:
using the formula Force(F)=mass(m)×acceleration(a),
since we are finding the mass of the object,we will make m the subject by dividing both sides by a.
you will now get m= f/a
the acceleration on Earth is usually 10m/s
m= 80/10
m= 8/1 which is also 8kg
the force of attraction between two masses is 3.60 Newtons if one of the masses is tripled and the distance between the masses is quadrupled what is the new force of attraction
Answer: F = 19.2 N
Explanation: Given that the initial Force = 3.6N
The formula involved is
F = GMm/r^2
Substitute the force F
3.6 = GMm/r^2
If one of the masses is tripled and the distance between the masses is quadrupled. We have
3.6 = (G × 3Mm)/(4r)^2
Where G will be constant.
3.6 = 3GMm/16r^2
Separate the fraction of number
3.6 = 3/16 × GMm/r^2
Make GMm/r^2 the subject of formula
(3.6 × 16)/3 = GMm/r^2
19.2 = GMm/r^2
Therefore, the new force of attraction is 19.2 N
Question 2 (2 points)
Practice tests are available online.
True
False
K12
3.If a force of 12 N is applied to an object with a mass of 2 kg, what will be its acceleration?
Answer:
6 m/s^{2}
Explanation:
The formula for force is
F = mass x acceleration
F = 12 N
mass = 2 kg
So, you can change the formula to solve for acceleration.
acceleration = F / mass
a = 12 N / 12 kg
a = 6 m/s^{2}
A piston has an area of 4 m2 and needs 20 N of force to push it down. What is the pressure?P=F/A *
A) 5 Pa
B) 0.2 Pa
C) 80 Pa
D) 20 Pa
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for besties with scienceeee!! asap plzz
Suppose you roll a bowling ball (m1)down the alley, and the ball strikes the pin (m2) sending it flying. The mass of the bowling ball is greater than the mass of the
pin. Predict the magnitude of the forces between the two objects during the collision
A)The bowling ballexerts a larger force on the pin because it was moving at
a high speed,
B)The pin exerts a larger force on the bowling ball
C)The bowing ball exerts a larger force on the bin because it is more massive
D)Both objects blert the same magnitude of force on each other due to Newtonsard Law
Answer:
The correct option is;
D) Both objects exert the same magnitude of force on each other due to Newton's 3rd law
Explanation:
Newton's third law of motion states that for every action there is an equal and opposite reaction
Since the bowling ball is rolled down the alley while the pin is displaced at such a speed that it flew, we have that the velocity of the rolling ball, v₁ is less than the velocity of the flying pin v₂
Therefore, whereby force = Rate of change of momentum produced we have;
The change of momentum of the ball = m₁×(v₁ - v₁ₐ)
The change of momentum of the pin = m₂×(0 - v₂)
Hence since the pin change in movement (flight) was more suddenly than the slowing down of the ball, the action of the rolling ball is equal to the reaction of the flying pin.
What is special relativity
Answer:
In physics, special relativity (also known as the special theory of relativity) is the generally accepted and experimentally confirmed physical theory regarding the relationship between space and time.
We need special relativity in order to solve for quantum gravity. ... The earth was expanding (thus, it's mass was expanding) through space in all directions in order to create gravity **OOPS** forgot, specifically at an accelerating rate… OR… The space must be pushing toward or down on the earth, from every direction.
Answer:
The theory of special relativity explains how space and time are linked for objects that are moving at a consistent speed in a straight line. ... The theory of special relativity was developed by Albert Einstein in 1905, and it forms part of the basis of modern physics.
Explanation:
What would a scientist most likely do to demonstrate the effects of a tsunami? (2 points) construct tsunami models make underwater plates move create actual underwater earthquakes take underwater photographs during a tsunami
Answer:
a - construct tsunami models
Explanation:
scientists cant effect on earthquakes directly, so its not 2 or 3
for 4 it wont help that much to study waves, so its better for them to make model of tsunami waves
which property of substances help to make a thermometer?
I NEED HELP.
Answer:
Mercury
Explanation:
Mercury streches when it is hot so that is why it goes up when the temperature is higher
Compare and contrast a series circuit with a parallel circuit. Be sure to
discuss how the wires are connected, how the electrons flow from the
battery how the bulbs work, and what a switch does.
Why is a device never 100% efficient? *
a) Mechanical Advantage
b) Work
c) Friction
d) Speed Ratio
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for science lovers!!
Write down the equation that links energy transferred, charge flow, and
potential difference.
Answer:
The description of the given scenario is described in the explanation segment below.
Explanation:
As a charge passes through some kind of potential gap, the electrical task is undertaken as well as energy will be transferred. The Potential difference seems to be an amount of work performed per unit charge and is denoted by "V" as well as a charge is denoted by "Q".The energy transferred could be determined by using the following equation or formula:
⇒ Energy transferred = charge × potential difference
The equation that links energy transferred, charge flow, and potential difference (voltage) is: [tex]E = qV[/tex]
In Science, when a potential difference (voltage) is applied on an object, it gains some potential energy, which is then converted to kinetic energy.
The kinetic energy possessed by the object is responsible for the movement of electrons from one point to another in an electric field.
Hence, the quantity of energy in an electric circuit is directly proportional to the charge and potential difference (voltage) applied on the object.
Mathematically, the energy transferred in an electric field is given by the formula:
[tex]E = qV[/tex]
Where:
E is the energy transferred.q is the charge.V is the potential difference.Read more: https://brainly.com/question/23153766
Why can a liquid take the shape of the bottom of its container?
A: The particles of a liquid can vibrate within their fixed locations
B: The particles of a liquid can break free from one another and spread out
C: The particles of a liquid can flow around one another to a new location
Answer:
c
Explanation:
bc the molecules are not so tightly packed it can slide past one another or flow to a new location.
1. Suppose you had come along before Mendeleev and were tasked with
organizing the elements into a pattern others could understand. Describe your
arrangement and how you would determine where elements would be placed.
Can you think of any problems your design might create?
2. The first periodic table was organized according to atomic mass, but the
current periodic table is arranged according to atomic number. What is the
difference between atomic mass and atomic number, and why is the atomic
number now the basis for the periodic table?
3. How would the periodic table look differently if it was arranged according to
atomic mass? Focus on Periods 1-4 to complete your answer.
Answer:
1. There would be two different tables, one arranged by mass and the second arranged by the chemical reactions the elements are known for
2. a. The difference is that the atomic mass is fixed and is 2 or more times the atomic number which is variable
b. The atomic number is the bases of the periodic table because it reflects the unique identity as well as the chemical and physical properties of the atoms more than the atomic number
3. The table formed by the atomic mass is not representative of the chemical properties of the elements
Explanation:
1. The elements would have been arranged by mass and by order of reaction such that there would be two tables where the first table will list all the known elements arranged by mass and the second table will group the elements in the order in which they can react or the kinds of compounds they can form such as oxides, nitrides etc
2. a. The atomic number, Z, is determined by the definitive number of protons contained in the nucleus of an atom and it is used for the classification of an atom as a particular element based on the its equivalent atomic number
The atomic number defines the chemical behavior of an an element because it is equal to the number of electrons present in a neutral atom
The atomic mass or mass number, A, is the total of the mass of the protons and the neutrons present in an atom
The neutron is electrically neutral, allowing its quantity to vary without significantly impacting on the chemical behavior of the atom, hence two different elements can have the same number of neutrons
Therefore, the difference is that the atomic mass is fixed and is 2 or more times the atomic number which is variable
b. The atomic number is the bases of the periodic table because it reflects the unique identity as well as the chemical and physical properties of the atoms more than the atomic number
3. If the periodic table was arranged according to the atomic mass, we would have;
Groups
H
He Li B C O F Na
Be N Ne Mg S Ar Sc
O Si Ca Ti Zn Se
It is seen that the above table is not representative of the chemical properties of the elements.
In charging by rubbing, electrons move from one material to another because
A. substances with very few neutrons have a net positive charge, so
they get the extra electrons.
O B. heavier substances get rid of electrons so they don't weigh as
much.
O C. the substance with the most protons steals electrons from the
other substance.
O D. some substances hold onto electrons tighter than other
substances, so they get the extra electrons.
Answer: D.
some substances hold onto electrons tighter than other
substances, so they get the extra electrons.
Explanation: When two substances are in contact by rubbing each other, there will be friction between them. The friction will stimulate what we called - Thermal energy. And what thermal energy does is the disrupt the bonding force or enhance it.
We can therefore conclude that some substances hold onto electrons tighter than other substances, so they get the extra electrons. Because at neutral state of the substance, the number of protons is equal to the number of electrons.
