Answer:
An atom is the part of an element. A particular element is composed of only one type of atom. Atoms are further composed of subatomic particles called electrons, protons and neutrons. Elements can combine with each other to form molecules via chemical reaction.
Can there be displacement of an object in the absence of any force acting on it? Think, Discuss it with your friends and teacher?
Answer:
An object can have a displacement in the absence of any external force acting on it
Explanation:
When a object moves with a constant velocity (v), then it gets displaced in the direction of motion but the net external force experienced by the object is zero.
F external =ma
If object moves with constant velocity, acceleration is zero.
Since, a=0 ⟹F external =0
Using s=ut+ 1/2 at ^2
⟹ Displacement s=ut (∵a=0)
Hence, an object can have a displacement in the absence of any external force acting on it
Hope this helped you:)
Ava runs track and field and is a long-distance runner. She has a big race coming up and needs to eat food that will provide her with enough energy to last throughout the race. What food would be best for her to prepare for her race?
A. salad
B. milk
C. apple
D. pasta
Answer:
A. salad
Explanation:
Which element is most likely to have an oxidation number of +3?
Answer:
A different answer to this is AI
Explanation:
Lithium, beryllium and boron are the elements that have an oxidation number of +3.
What is oxidation number?Oxidation number refers to the total number of electrons that an atom gains or loses in order to get stability and formed chemical bond with another atom. Atoms that lose electron form positive charge.
So we can conclude that Lithium, beryllium and boron are the elements that have an oxidation number of +3.
Learn more about oxidation here: https://brainly.com/question/25886015
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If the mass of a box is 200 Kg, with what net force would you use to make the box accelerate 2.4 m/s 2 ?
Answer:
The net force used on the box was 480 N
Explanation:
Mechanical Force
According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:
F = ma
Where a is the acceleration of the object.
The mass of a box is m=200 kg and it's accelerated at a=2.4\ m/s^2 by a net force whose magnitude is:
F = 200 * 2.4 N
F = 480 N
The net force used on the box was 480 N
Which of the following has zeros that are not significant?
2.05 m/s
10.0 J
1.30 N
100 kg
Answer: Either 10.0 J or 1.30 N
Explanation:
10.0 J
if it was 10.01 it would be significant, but its 10.0 which makes it a whole number
1.30 N
All zero's preceding the first integers are never significant. For example: 0.0078 has two significant figures. All zero's after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures
Answer:
100 kg
Explanation:
With the absence of a decimal point, only the 1 would be significant.
An object is spun around in circular motion such that its frequency is 500 Hz.
a. What is the period of its rotation?
b.
HowW much time will be required to complete 7 rotations?
Explanation:
Given parameters:
Frequency = 500Hz
Unknown:
a. Period of rotation
b. Time required to complete 7 rotation
Solution:
The period of rotation is the time taken to complete a turn.
P = [tex]\frac{t}{n}[/tex]
P is the period
t is the time
n is the number of turns
Period is the inverse of frequency;
P = [tex]\frac{1}{500}[/tex] = 0.002s
b.
Time required to complete 7 rotation;
P = [tex]\frac{t}{n}[/tex]
t = P x n
t is the time
P is the period
n is the number of rotations
t = 0.002 x 7 = 0.014s
Diffraction is useful in which of the following fields?
a. calculus
b. anthropology
c. astronomy
d. astrology
a wagon has a mass of 100 kg an acceleration of 2m/s/s. What is the force on the wagon?
Answer:
200N
Explanation:
Given parameters:
Mass of wagon = 100kg
Acceleration = 2m/s²
Unknown:
Force on the wagon = ?
Solution:
From Newton's second law of motion:
Force = mass x acceleration
Now insert the parameters and solve;
Force = 100 x 2 = 200N
decreases, gravitational, increases, kinetic, potential, thermal
A car driving along a road has energy in its _______ store. If the car drive faster this store_____. If the car drives up a hill, energy is transferred to its ____ store. If the care brakes, the kinetic store _____.
what english word does the following- the first two signify a male, the 1st 3 letters support a female, the first four support a great signifiles a woman. What is the english word?
Answer:
lol i know - i was rushing -_-
he= male
her=female
One word with both is heroin but Im not 100% sure
Jeff uses a solar cell to run a small motor. What energy transformation occurred?
(A) Light to electric to potential
(B) Light to electric to kinetic
(C) Electric to solar to kinetic
(D) Kinetic to electric to mechanical
what happens to homeostasis as we get older?
Explanation:
Mark above as brainliest answerA 34.75 kg boulder is rolling down a hill. If, at one moment, the boulder has a momentum of 239.5 kg ⋅ m/s, what is its velocity at that time?
Answer:
Velocity = 6.89 m/s
Explanation:
The equation for momentum: [tex]Momentum=(Mass)(Velocity)[/tex]
Substitute the given information into the equation and solve for velocity.
[tex]239.5=34.75(Velocity)\\\frac{239.5}{34.75}=\frac{34.75(Velocity)}{34.75\\}\\6.89=Velocity[/tex]
The model shows how solar-powered electric cars indirectly use energy from the Sun. Describe the energy transformations that you see.
Answer:
Radiant energy from the Sun is converted into electrical energy. Electrical energy is then converted into chemical energy. Chemical energy is then converted into electric energy for the motor. The motor converts electrical energy into mechanical energy and makes the car move.
Sun makes radiant energy > converted to electrical energy through solar panels > converted to chemical energy which is then stored in a battery for the motor > converted into mechanical energy to make the car move
Extra:
Look at the image below for a better understanding of the question. I hope this helps! :)
Source:
Edmentum Guided Notes
The energy transformations that can be seen in solar-powered electric cars :
Solar energy > electrical energy > chemical energy > mechanical energy.
What is solar-powered electric cars?
A solar electric car is one that is primarily or entirely powered by solar energy. Solar panels typically feature photovoltaic (PV) cells that convert solar energy directly into electric energy. The phrase "solar vehicle" typically implies that all or some of a vehicle's propulsion is powered by solar energy. Communications, controls, and other auxiliary operations might all be powered by solar energy.
In solar electric car, solar energy converted into electrical energy by photovoltaic (PV) cells. This energy is stored in battery in the form of chemical energy. When the car moves, this chemical energy transforms into mechanical energy.
Learn more about solar-powered car here:
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Which statement accurately compares the trends in atomic number and atomic mass in the periodic table?
O The atomic number increases from left to right, while the atomic mass increases from right to left.
O The atomic mass increases from left to right, while the atomic number increases from right to left.
O Both the atomic mass and the atomic number increase from left to right.
O Both the atomic mass and the atomic number increase from right to left.
Answer:
C.
That is your answer
The figure below shows a shooting competition, where air rifles fire soft metal at distant targets
Answer:
where is the figure?
Explanation:
What evidence do we have that Earth has a magnetic field surrounding the planet?
A compass works the way it does because Earth has a magnetic field that looks a lot like the one in a magnet.
What is magnetic field?The Earth's field is completely invisible, but it can be felt by a compass needle on the Earth's surface, and it reaches thousands of miles out into space.
Mathematically, the magnetic field is represented as a vector field. This vector field can be easily visualized as a collection of several vectors laid out in a grid. Each vector has a length based on the strength of the magnetic field and points in the same direction as a compass would.
This method is demonstrated by placing a grid of numerous small compasses in a magnetic field. The only distinction is that a compass does not reveal the strength of a field in this instance.
Therefore, A compass works the way it does because Earth has a magnetic field that looks a lot like the one in a magnet.
To learn more about magnetic field, refer to the link:
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Mutations in sections of DNA can be caused by all of the following EXCEPT
Question 2 options:
Viruses
Chemicals
Ultraviolet Radiation
Sexual Reproduction
Answer:
sexual reproduction
Explanation:
what is the weight of a box that has a mass of 25 kg?
Answer:
Explanation:
The weight of an object is a measurement of how hard a force(in our case gravity) is pulling on an object. so W = mg, where W - is the weight. in our case W is G (Gravitational force) So G = mg => m = G/g => m = 25/9.8 => m = 2.5 kg. If you're problem states that weight is measured in kg, then it is definitely wrong. Weight is measured in Newtons and mass in kg. There are different system of units like gravitational,SI, MKS. I have seen in some text as slug as the unit of mass in gravitational system.So mass of 25 kg weight is 25/9.81 slug of mass.
Answer:
245.18 newtons
Explanation:
For example,
10 kg times 9.8 N/kg equals
98 N.
Pls help :( this is really hard and I need to pass this grade lol
A horse pulls a plow with a 242 N force for
61.7 m. How much work does the horse do?
A. 3.92 J
B. 180 J
C. 0.255 J
D. 14900 J
Answer: The answer is D
Explanation: i had the same question and i just guessed and got it first try
Answer:
Explanation:
its D i have all my notes here and the top person of me is right :)
How are ocean waves different from waves experienced in an earthquake?
When an earthquake occurs, rocks at a fault line slip or break, and two sections of Earth's crust physically move relative to one another. That movement releases energy, and two types of seismic waves radiate outward from the earthquake through Earth's interior and along its surface.
WHEREAS
Ocean waves are created by energy passing through water, causing it to move in a circular motion. ... Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest.
4. Describe solids and
give an example.
Answer:
A solids molecules are tightly packed to get her and an examle of a sold is a rock
Explanation:
Which is NOT a part of an electric motor?
a.
armature
b.
brushes
c.
commutator
d.
slip ring
Which graph accurately shows the relationship between kinetic energy and speed as speed increases?
Answer:
B
Explanation:
kinetic energy (KE) is the energy possessed by moving bodies. It can be expressed as:
KE = [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex]
Where: m is the mass of the object, and v its speed.
For example, a stone of mass 2kg was thrown and moves with a speed of 3 m/s. Determine the kinetic energy of the stone.
Thus,
KE = [tex]\frac{1}{2}[/tex] x 2 x [tex]3^{2}[/tex]
= 9
KE = 9.0 Joules
Assume that the speed of the stone was 4 m/s, then its KE would be:
KE = [tex]\frac{1}{2}[/tex] x 2 x [tex]4^{2}[/tex]
= 16
KE = 16.0 Joules
Therefore, it can be observed that as speed increases, the kinetic energy increases. Thus option B is appropriate.
If 3.5 waves have a distance of 42M what is the wavelength of one wave?
Please please please tell me how you exactly found the answer!!
Answer:
The answer is 12
Explanation:
Just divide 42/3.5
wooden block has a mass of 0.2 kg, has a specific heat of 710 J/(kg°C), and is a temperature of 20.0°C.
What is the block’s final temperature if its thermal energy increases by 2130 J?
Answer:
The final temperature is 35 °C.
Explanation:
Given that,
Mass of the wooden block, m = 0.2 kg
The specific heat of the block, c = 710 J/(kg°C)
Initial temperature, [tex]T_i=20^{\circ} C[/tex]
Thermal energy, Q = 2130 J
We need to find the block's final temperature. The thermal energy due to change in temperature is given by :
[tex]Q=mc(T_f-T_i)\\\\T_i\ \text{is initial temperature}\\\\\dfrac{Q}{mc}=(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{2130}{0.2\times 710 }+20\\\\T_f=35^{\circ} C[/tex]
So, the final temperature is 35 °C.
In this activity, you will analyze the motion of a cart being pulled up an inclined plane at a constant speed. The angle of the incline can be modified by 10 degrees increments between the values of 30 degrees and 90 degrees. Three different masses can be selected - 2.0kg, 3.0kg, and 4.0kg in each simulation the cart is pull d to the same height - 1.0 meter above the original starting position. For each simulation, the force that must be applied is reported on the screen. The displacement of the cart can be measured using the cm-ruler that is displayed for each trial. Can some help me
Answer:
darn this too much lololpop
What is the orbital period of a moon orbits around a 1.0*10^26 kg planet that has a is the orbit radius of 2.48 x 10^7?
Answer:
222334
Explanation:
Please mark me brainlist
A girl during a hike has a bottle of mineral water in her haversack. The bottle has 2 litres of water in it (2ltr. weigh 2kg). The water gets heated by the sun by 5 °C. How much heat has the water absorbed from the sun?
Answer:
Q = 41800[J]
Explanation:
These types of problems can be solved using the following heat transfer equation for quarps that increase or decrease their temperature as a function of mass.
[tex]Q=m*C_{p}*DT[/tex]
where:
Q = Heat absorbed [J]
m = mass = 2 [kg]
DT = temperature change = 5 [°C]
Cp = specific heat of the water = 4180 [J/kg*°C]
[tex]Q=2*4180*5\\Q=41800[J][/tex]
Units of energy (Joules) [J]