Question 5
2 pts
(04.03 MC)
Which types of changes must follow the law of conservation of mass? (2 points)
O Both physical and chemical changes
Neither physical nor chemical changes
O Only physical changes
O Only chemical changes
Answer:
A Both physical and chemical changes.
Explanation:
Priscilla was building a circuit that used copper wires to connect a battery to a light bulb. As she connected the final wire from the light bulb back to the battery, the light bulb turned on. Priscilla knew that current was now flowing through her closed circuit. What makes the current in the circuit flow?
Answer:
Voltage or electromotive force
Explanation:
The voltage or electromotive force in an electrical circuit causes current to flow from a point of higher electrical potential to that of a lower electrical potential in the electric circuit. So, when Priscilla closes the circuit, the electromotive force makes current to flow in the circuit and thus turn on the bulb.
A race car accelerates from 16.5 m/s to 45.1 m/s in 2.27 seconds. Determine the acceleration of the car.
O 12. 60 m/s2
O 5.9 m/s2
8.8 m/s2
O 10.8 m/s2
Answer:
12.6
Explanation:
what do you know about the universe
Answer:
all existing matter and space
Explanation:
Answer:
The universe diameter is unknown
Explanation:
what is the power of television that transfers 6750J of energy every 45 seconds.
Help!
An alert driver must be able to react to the unexpected actions.
A. of other drivers.
B. caused by their drug use.
C. observed while impaired.
An alert driver must be able to react of the unexpected actions of other drivers. Hence, option A is correct.
What is Traffic?Traffic is made up of people using public ways (roadways) for movement, such as walkers, cars, trains, and animals being ridden or herded.
The road rules include traffic rules and unwritten guidelines that may have evolved through time to help ensure the timely and orderly flow of traffic. Traffic laws control and regulate traffic. In general, organized traffic has lanes, right-of-ways, priorities, and intersection traffic control.
In many jurisdictions, traffic is formally structured with designated lanes, junctions, intersections, junctions, traffic signals, or signage.
The three main categories of traffic are heavy motor vehicles, other vehicles, and pedestrians. Speed restrictions and easements may be shared by different classes, or they may be segregated.
Therefore, an alert driver must be able to react as per the other drivers, so it can prevent any mishappening.
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Which of the following best describes acceleration?
the rate of change of position
the rate of change of velocity
the rate of change momentum
the rate of change of force
Answer:
the rate of change of velocity
A particle moving at a velocity of 4.7 m/s
in the positive r direction is given an accel-
eration of 5.4 m/s in the positive y direction
for 0.1 s.
What is the final speed of the particle?
Answer:
5.24m/s
Explanation:
Given parameters:
Initial velocity = 4.7m/s
Acceleration = 5.4m/s²
Time = 0.1s
Unknown:
Final velocity of the particle = ?
Solution:
Acceleration is the rate of change of velocity with time.
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Now find v;
5.4 = [tex]\frac{v - 4.7}{0.1}[/tex]
0.54 = v - 4.7
v = 5.24m/s
What is the difference between a waves, amplitude, frequency and wavelength?
Answer: The amplitude or height of a wave is measured from the peak to the trough
Explanation: The wavelength is measured from peak to peak. Otherwise wavelength is directly related to the frequency of a given wave form
A spring with a spring constant of 2.5 N/m is stretched by 2
m. What is the potential energy in the spring?
Answer:
Eelas = 5 [J]
Explanation:
Elastic energy is associated with the ability that has a spring or any other material with elastic properties.
We can calculate the elastic energy by means of the following equation:
[tex]E_{elas}=\frac{1}{2} *k*x^{2}[/tex]
where:
k = constant spring = 2.5 [N/m]
x = distance stretched = 2 [m]
[tex]E_{elas}=\frac{1}{2} *2.5*(2)^{2}\\E_{elas}=5[J][/tex]
A student investigated how length affects resistance of a wire.
Figure 1 shows the circuit the student used.
The student took measurements using the meters X and Y.
Name meters X and Y.
Answer:
X is ammeter and Y is voltmeter
Explanation:
The resistance of a wire is directly proportional to the length of the wire. That is the longer the length of the wire, the higher the resistance and the shorter the length of the wire, the smaller the resistance.
Ammeter is a measuring instrument used to measure the current in a circuit by connecting the meter in series with the circuit.
Ammeter is a measuring instrument used to measure the potential difference between two points by connecting the meter in parallel to the points.
Meter X is an ammeter since it is connected in series and meter Y is a voltmeter because it is connected in parallel.
What is the momentum of a 750-kg Volkswagen Beetle when at rest? (value only, no units)
Value:
Answer:
P = 0
Explanation:
Momentum is defined as the quentity of motion contained in a body. Mathematically, it can be defined as the product of mass and velocity. So, in order to determine the Volkswagen Beetle, at rest, we can use the simple formula, as follows:
[tex]P = mv[/tex]
where,
P = Momentum of Volkswagen Beetle = ?
m = Mass of Volkswagen Beetle = 750 kg
v = Velocity of Volkswagen Beetle = 0 m/s (since, it is at rest)
Therefore,
[tex]P=(750)(0)[/tex]
P = 0
Very Important!!
If a person rapidly drinks a large amount of alcohol, it could lead to what is known as.
A. an alcohol-induced blackout.
B. an alcohol-inspired coma.
C. an alcohol-induced fainting spell.
Answer:
B) an alcohol-inspired coma
There are three types of alcohol one is primary second is secondary and third is tertiary. Therefore, the correct option is option B that is an alcohol-inspired coma.
What is alcohol?Alcohol is a chemical molecule with a functional group called hydroxyl linked to a saturated carbon atom. Alcohols classified as primary have just one alkyl group on which the carbon atom of the hydroxyl group (OH) is connected.
Secondary alcohols are those that have two alkyl groups on either side of the carbon atom of the hydroxyl group. In tertiary alcoholic group, the carbon that is bonded to hydroxyl group is bonded to three alkyl groups. If a person rapidly drinks a large amount of alcohol, it could lead to what is known as an alcohol-inspired coma.
Therefore, the correct option is option B.
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A radium atom has 88 protons and 226 neutrons. How many electrons does it have?
Answer:
No. of electrons = 88
Explanation:
Given that,
No. of protons = 88
No. of neutrons = 226
We need to find the number of electrons it have in a radium atom.
In an atom, the number of protons is equal to the number of electrons. There are 88 protons in this case.
Hence, there are 88 electrons in the radium atom.
A 10 kg bowling ball that is 20 meters above ground has more gravitational potential energy than a 1000 kg wrecking ball that's on the ground (height is Om), True or False?
Answer:
True
Explanation:
The Gravitational potential energy is given by:
G = mgh
m = mass of body ; g = acceleration due to gravity ; h = height
G for a ball of mass 10kg ; height of 20 meters above the ground
G = 10kg * 9.8m/s² * 20m = 1960 kgm²/s²
G for a ball of mass 1000kg at height, 0 meters :
G = 1000 * 9.8 * 0 = 0
1960 > 0
Hence, Gravitational potential energy for 10kg ball at height 20m is greater Thammfor a 1000kg ball on the ground.
why floating is important in swimming?
Answer:
floating is important in swimming because if you are ever in a bad position possibly in the ocean and get tired of swimming you can float.
Explanation:
An object completes 2500 cycles in 25 s.
a. What is the period of its rotation?
b. What is the frequency of its rotation?
Answer:
a) 0.01s
b) 100Hz
Explanation:
Period is defined as the time taken by a wave to complete 1 oscillation.
Since the object completes 2500 cycles in 25secs, we can write
2500cycles = 25secs
1 cycle = x
Cross multiply
2500x = 25
x = 25/2500
x = 0.01secs
Hence the period of its rotation is 0.01secs
b) is the reciprocal of the period
Frequency = 1/Period
Frequency = 1/0.01
Frequency = 100Hertz
Hence the frequency of rotation is 100Hz
Complete the statement below with all that apply.
Acceleration is
The answer is B- the slope of a velocity vs. time graph.
Somebody please help
Answer:
a = 0.1067 [m/s²]
Explanation:
In order to solve this problem, we must first draw a free body diagram with the forces acting on it.
a)
In the attached image we can find the free body diagram.
b)
The net force can be found by performing a sum of forces on the X-axis, these forces are seen in the free body diagram.
∑Fx = Fr
where:
Fr = resultant force [N] (units of Newtons)
[tex]F_{r}=275+275-310\\F_{r}=240[N][/tex]
c)
Acceleration can be found by means of Newton's second law, which tells us that the sum of the forces in a body or the resulting force is equal to the product of mass by acceleration.
∑F = m*a
where:
m = mass = 2250 [kg]
a = acceleration [m/s²]
[tex]240=2250*a\\a=0.1067[m/s^{2} ][/tex]
What is the difference between a mechanical wave and an electromagnetic wave?
A mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
A mechanical wave has a high frequency, while all electromagnetic waves have low frequencies.
A mechanical wave travels through matter, while an electromagnetic wave travels through empty space.
its regular chooiseing just decide one and tell me
Answer: A a mechanical wave travels through empty space, while an electromagnetic wave travels through matter.
Explanation: A mechanical wave travels through empty space, while an electromagnetic wave travels through matter. A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.
Which of the following is not the result of nuclear decay.
An unstable atomic nucleus emits energy
An unstable atomic nucleus discharged particles
An unstable atom changes its identity
A stable atom change its identity
Answer:it’s c
Explanation:
Answer:
an unstable atomic nucleus emits energy
Explanation:
just toke quiz
Coulomb's Law tells us that the relationship of the distance between the charges and the force them is ...
A. inversely proportional
B. direct square
C. inverse square
D. directly proportional
Answer:
inversely proportional
Explanation:
I know this because I'm learning this right now. My teacher told me that Coulomb's Law is important because it shows us the positive and negative attraction between the two charges. It also tells us that if we have two like charges, then they're going to repel, but the closer they get, the bigger charge it's going to have. Coulomb's Law tells us the force between charged particles is inversely proportional to their charges.
what kind of charge does a pencil sitting on a table have
Answer
Potential energy
Explanation:
When the pencil is sitting on the desk, it has maximum potential energy and minimum kinetic energy. As it falls, its velocity increases, which increases the kinetic energy
Is steam gas? If not what is?
Answer:
steam is a gas
Explanation:
Answer: Steam is an invisible gas, unlike water vapor, which appears as a mist or fog.
Explanation:
Aaron walks 5 miles every day for exercise, leaving his front porch at 5:00 am. And returning to his porch at 6:00 am. What is the total displacement of his daily walk? *
need to know the answer now
Answer:
Total displacement = 0
Explanation:
He lives his front porch and still returns to his front porch.
Now, displacement is a vector quantity and as such, it is the distance between the initial point of movement and the final point of movement.
In this case the initial point is the same as the final point and thus the displacement is zero.
A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10 m/s. The instant before the stone hits the ground below, it has 450 J of kinetic energy. If she were to throw the stone horizontally outward from the cliff with the same initial speed of 10 m/s, how much kinetic energy would it have just before it hits the ground
Answer:
It will have the same KE ( 450 J ) just before it hits the ground. The GPE transferred to KE is the same in both cases and the original KE is the same in both cases so the total will be the same.
The one thrown sideways will take longer to get to the ground but it will have the same velocity ( and therefore KE ) as the thrown down stone.
Explanation:
forces can be________. What phrase completes the sentence.
1.Pushes only
2.Pushes or pulls
3.Pulls only
Answer:
pushes or pulls
Explanation:
hope this helps....
Which is the best set of tools to use for separating a mixture of water, sugar, and
pebbles?
A. a filter and a magnet
B. a filter and a hot plate
c. a magnet and a hot plate
D. a settling tank and a filter
The one that is best set to use for separating a mixture of water, sugar, and pebbles is a filter and a hot plate. The correct option is B.
What is a mixture?A mixture is made up of one or more pure substances that have varying compositions.
Mixtures are classified into two types: heterogeneous and homogeneous. Heterogeneous mixtures have distinct components, whereas homogeneous mixtures appear uniform throughout.
During distillation, the sugar solution is heated, causing water to evaporate and leaving the sugar behind.
After that, the water vapor is passed through an inclined tube. It cools due to the cold water around it and condenses to form water in a separate container.
Filters can generally separate mixtures of solids in liquids, solids in gases, and solids in solids. Filtration is the separation of unwanted particles from desired particles.
Thus, the correct option is B.
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Which of the following is NOT made up of atoms?
A. Heat
B. A gas
C. A cell
D. A solid
Answer:
A. heat
Explanation:
heat isn't a physical thing like all the rest of the options
How many groups are in the modern periodic table?
12
18
22
24
Answer:
18
Explanation:
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