Which is a characteristic of a physical change? (1 point)
a
The chemical bonds in the substance are unchanged.
b
The change cannot be seen.
c
The molecules all move at the same speed.
d
The substance has reacted with another substance.
which acid is dangerous between vinegar,pure water,lemon juice and milk?
Answer:
Explanation:
Oftentimes when people hear that something has a low or high pH, they worry that it is dangerous. But this is not the case, pH alone cannot tell you if a substance is dangerous or not. Anyway, bases are typically considered more dangerous than acids! But what is pH? A substances pH is simply the concentration of hydrogen ions (H+) of the material when in solution (usually water). It is a numeric (logarithmic) scale used to specify how acidic or basic an aqueous solution is and an aqueous solution is just a solution where water is the solvent.
2
Which of the following best describes temperature?
A
Number of molecules
B
Motion of molecules
C
Size of molecules
D Type of molecules
Answer:
B
Explanation:
Answer:
b the motion of molecules
Explanation:
i just took the test and it makes the most sense
What effect do you think thermal energy and the transfer of heat in Earth’s interior have on the surface of the planet?
Answer:
I love your pfp also! Put the image i put in full screen and theres your answer
why can you hear a mans voice around the corner of a building even if you can't see him
Answer:
A. Diffraction
Explanation:
You can immedietly mark out C and D, they make no sense. And reflection is the bending of light, leaving you with A. Diffraction
You marked this question as mathematics even though it belong in physics, please try to categorize it accordingly next time.
May I have brainliest please? :)
Answer:
A. Diffraction
Explanation:
Ape.x
Which of the following best describes the circuit shown below?
A. Parallel
B. Open
Ο Ο
C. Short
O
D. Series
Answer:
A..............hope it will help you
A circuit is made up of a bar magnet, a wire coil, an ammeter and connecting
wires. Which part could you exclude from the circuit and still have a working
electromagnet?
A. The wire coil
B. The bar magnet
O
C. The connecting wires
D. The ammeter
Answer: the ammeter
Explanation:
Answer:
The answer is D. The ammeter.
Explanation:
I took the quiz.
I WILL GIVE BRIANLEST I NEED HELPPP HELPP PLEASE
Answer:
solar system is the first blank
Answer:
atmosphere; solar system; rotations; energy; features; surface; solid; measurements
Explanation:
To be honest there really isn't an explanation. Hope this helps!
The head of a 245 g golf club traveling at 62 m/s just before it strikes a 48 g golf ball at rest on a tee. After the collision, the club travels in the same direction at 43 m/s. Use the law of conservation of momentum find the speed of the golf ball just after impact.
Answer:
The speed of the golf ball just after impact is 96.98 m/s
Explanation:
Given;
mass of the club, m₁ = 245 g = 0.245 kg
initial velocity of the club, u₁ = 62 m/s
mass of the golf ball, m₂ = 48 g = 0.048 kg
initial velocity of the golf ball, u₂ = 0
final velocity of the club, v₁ = 43 m/s
let the final velocity of the golf ball
Apply the law of conservation of momentum;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
0.245(62) + (0.048 x 0) = 0.245(43) + 0.048v₂
15.19 = 10.535 + 48v₂
15.19 - 10.535 = 48v₂
4.655 = 48v₂
v₂ = 4.655 / 0.048
v₂ = 96.98 m/s
Therefore, the speed of the golf ball just after impact is 96.98 m/s
(FREE FALL) An object falls from an unknown height, crosses last 196m in 4s. Find the falling time and height.
Answer: An object is dropped from a height of 75.0 m above ground level.
Explanation: I hoped that helped !
Bob roller skates with a constant speed of 6 miles per hour. How long
will he take to travel a distance of 128 miles ?
The coefficient of friction between the wheels of a 2500 kg Hearse and the dry pavement is 0.85. Determine the acceleration that the car experiences while skidding to a stop.
Answer Calculate the centripetal force exerted on a 900 kg car that negotiates a 500 m radius curve at 25.0 m/s. Assuming an unbanked curve, find the minimum static coefficient of friction, between the tires and the road, static friction being the reason that keeps the car from slipping (see Figure 2). Strategy and Solution for Part 1
Which of these shows unbalanced forces at work on an object?
Answer:
When forces on a object become unbalanced, the object moves.
Explanation:
What is the mass of a truck that has a momentum of 10,000 kg*m/s and a velocity of 4m/s North?
Answer:
2500 kg
Explanation:
m=p/v
?=10000kgm/s/4m/s
?=2500 kg
The chart shows the percentage of different elements in the human body.
Which element is the most prevalent in the human body?
nitrogen
hydrogen
carbon
oxygen
the object is in _________ when the vector sum of the force is acting on the object is equal to zero
Answer:
Equilibrium
Explanation:
An object is in equilibrium when the vector sum of the force acting on the object is equal to zero.
A body in equilibrium is at state of rest of rest or in motion with no external force acting on it.
The resultant of all forces acting on the body is zero. In this case there is no net force and the body will be at rest.(Repost) I need this answer ASAP!
See the attached picture.
The sentences have been carefully dragged to the right places.
Which of the following is a derived physical quantity?
A. Time
B. Mass
C. Length
D. Volume
The strength of force is expressed by a. Weight b.mass
Answer:
Weight.
Explanation:
Una larga fanja de pavimento tiene marcas a intervalos de 10m. Los estudiantes usan cronometros para registrar los tiempos en que un automovil pasa por cada marca. Asi han obtenido los datos siguientes: Distancia,m l 0 l 10 l 20 l 30 l 40 l 50 l Tiempo,s l 0 l 2.1 l 4.2 l 6.3 l 8.4 l 10.5 l A) Cual es la rapidez media del vehiculo? B) Al cabo de cuanto tiempo la distancia es igual a 34m? C) Cual es la aceleracion del automovil?
Answer:
men
Explanation:
What is the greatest velocity which a falling object can achieve while falling through the air?
A. final velocity
B. terminal velocity
C. initial velocity
D. maximum velocity
Answer:
Terminal Velocity
Explanation:
A sound wave is produced in a metal cylinder by striking one end. Which of the following occurs as
the wave travels along the cylinder?
a. Its frequency increases
b. It transfers matter
C. It transfers energy
d. Its amplitude increases
Answer:
C. It transfers energy
Explanation:
As the metal cylinder is strike at one end, energy is being transferred.
A wave is a disturbance that transmits energy from one point to another. All waves are prominent for their energy transfer potentials. Waves do not move materials of the medium. The frequency of the wave does not increases same with the amplitude. The most important thing about a wave is the ability to transmit energyWhat could you do to increase the electric potential energy between two
positively charged particles by a factor of 16?
Answer:
Increase the charge of one particle by a factor of 16
Explanation:
HELPP ITS DUE IN 5 MINUTES FREE BODY DIAGRAMS
Answer:
I think it's part c . but sorry if its wrong
anyone have the answers lol ????
Answer:
I do have the answer
Explanation:
_______________________________ gives the people with intellectual disabilities a chance to develop their self confidence and compete with others with similar interests.
Group of answer choices
Summer Olympics
Winter Olympics
Special Olympics
Paralympic Games
Answer:
special Olympics its the correct answer
A car’s velocity changes from 35 m/s to stopped in 13 seconds. Calculate
acceleration.
Answer:
Acceleration = 3m/s^2
Vf= 0 Vi =35m/s t= 13s
Explanation:
[tex]Acceleration = \frac{Change in velocity}{Change in time}\\ = \frac{35m/s}{13s}\\ a = 2.69m/s^2\\ a = 2.7m/s^2\\ a = 3m/s^2[/tex]
7
The diagram shows a wooden beam PQ, of negligible weight, which is attached to a wall by a
hinge at P and kept in a horizontal position by a vertical rope attached at Q.
The beam is 3.0m in length.
A man of weight 800 N walks along the beam from P to Q.
wall
man
-rope
beam
Р
Q
hinge
1200
What is the distance of the man from P when the tension in the rope at Q becomes equal to
500N?
Gadifada
Answer:
Explanation:
Taking moment of forces about the hinge ,
moment of weight of man = 800 x p where p is his distance of man from hinge , in clockwise direction .
moment of tension force in rope in anticlockwise direction
= 500 x 3
For rotational balancing
800 x p = 500 x 3
p = 1.875 m .
From the principle of moment, the distance of the man from P is 1.9 m
From the question, below are the given parameters;
The Length of the beam = 3mThe weight of the man = 800 NThe tension in the string = 500 NAs the man walks toward the string, the tension on it will act downward, while the normal reaction on the man will act upward.
From the principle of moment,
Clockwise moment = anticlockwise moment
Let us take our moment from point P. That is,
500 x 3 = 800 x d
Make d the subject of formula
d = 1500 / 800
d = 1.875 m
Therefore, the distance of the man from P when the tension in the rope at Q becomes equal to 500N is 1.9 meters approximately.
Learn more about moment here: https://brainly.com/question/6278006
Jane is a crime scene investigator. She wants to reveal small particles with high contrast. So, she positions the forensic lamp at a very low angle against the surface. Which technique is she using? A. fluorescence B. oblique lighting C. absorption D. spectroscopy E. stereoscopy
Answer:
Pretty sure it's B. Oblique Lighting
Explanation:
A. is clearly wrong, C. is also clearly wrong, D and E both have nothing to do with lighting, Oblique Lighting is defined as "using a light source positioned at a low angle. Oblique lighting is usually used to show detail by creating shadows on the surface of the evidence." Hope this helps.
The focus of an earthquake is the: center of the earthquake point on the surface directly above the earthquake point underground where the earthquake starts direction the seismic waves travel
Answer:
B. point on the surface directly above the earthquake
Explanation:
The earthquake involves the propagation of waves through the inner part of the earth due to natural or artificial processes. This majorly leads to the vibration of the earth crust of the affected region as the waves propagates. Thereby, causing sometimes the a violent break up of the surface of the earth from within.
Therefore, the focus of an earthquake is majorly called its epicenter, which is a point on the surface directly above the earthquake itself.