Answer:
3amps
Explanation:
voltage v = current I × resistance R
current = voltage÷ resistance = 90÷30= 3amperes
The nucleus of the atom composed of what subatomic particle(s)? A Neutrons and Electrons B Protons and Neutrons C Protons and Electrons D Protons and Electrons
Answer:B Protons and Neutrons
Explanation:
The nucleus of the atom discovered in 1911 by Ernest Rutherford from the Geiger–Marsden gold foil experiment consists of protons and neutrons at the center of the atom which are are bound together by a nuclear force.
The nucleus has two basic properties which are the mass and charge of which the proton is positively charged having +1 and the neutron having a neutral charge at zero . Both are denoted with mathematical numbers: Z- proton and N-neutron and their addition gives the mass number,A.
Both protons and neutrons have a mass of 1 amu.
Technician A says that work is being performed if a force is being applied, yet the object does not move. Technician B says that torque is a twisting force that may or may not result in motion. Which technician is correct
Answer:
Technician B is correctExplanation:
According to technician B "torque is a twisting force that may or may not result in motion" which is right, but technician A is wrong in the sence that for work to be done the force must be applied over a distance that is there must be movement over a distance.
What is work?
work is the application of force over a distance
mathematically
work= force* distance
and it is measured in joules
What is torque?
Torque is a measure of the force that can cause an object to rotate about an axis(hence it is very possible that the object maintained its position)
car travels 80 meters due north in 12 seconds then the car turns around and travels 30 Mi do South in 4 seconds calculate the average speed and average velocity of the car during this 60-second interval use guess method
Answer:
1) 3.1 m/s
2) 7 m/s
Explanation:
Distance due north = 80 m
Distance due south = 30 m
Distance between north and south = (80 - 30) m = 50 m
Total time = (12 + 4) sec = 16 sec
1) Average speed = 50/16 = 3.1 m/s
2) Average velocity = Total distance/total time = (80 + 30) m/16 s = 110/16 = 7 m/s
A particle makes 240 revolution per minutes on a circular radius of 2m find: (I) it's period (ii) it's angular velocity (III) it's linear velocity and (iv) it's acceleration
Answer:
(i) The period is 0.25 seconds, (ii) The angular velocity is approximately 25.133 radians per second, (iii) The linear velocity of the particle is approximately 50.266 meters per second, (iv) The acceleration experimented by the particle is approximately 1263.336 meters per square second.
Explanation:
(i) Let suppose that particle experiments an uniform circular motion. The period ([tex]T[/tex]) of the particle, measured in seconds, is the time needed to complete a revolution, which is determined by this:
[tex]T = \frac{2\pi}{\omega}[/tex]
Where [tex]\omega[/tex] is the angular speed, measured in radians per second.
Let is convert angular speed from revolutions per minute into radians per second:
[tex]\omega = \left(240\,\frac{rev}{min} \right)\times \left(\frac{1}{60}\,\frac{min}{s} \right)\times \left(2\pi\,\frac{rad}{rev} \right)[/tex]
[tex]\omega \approx 25.133\,\frac{rad}{s}[/tex]
The period of the particle is:
[tex]T = \frac{2\pi}{25.133\,\frac{rad}{s} }[/tex]
[tex]T \approx 0.25\,s[/tex]
The period is 0.25 seconds.
(ii) The angular velocity is approximately 25.133 radians per second.
(iii) The linear velocity of the particle ([tex]v[/tex]), measured in meters per second, is found by this expression:
[tex]v = R\cdot \omega[/tex]
Where:
[tex]R[/tex] - Radius, measured in meters.
[tex]\omega[/tex] - Angular velocity, measured in radians per second.
If [tex]R = 2\,m[/tex] and [tex]\omega \approx 25.133\,\frac{rad}{s}[/tex], the linear velocity of the particle is:
[tex]v = (2\,m)\cdot \left(25.133\,\frac{rad}{s} \right)[/tex]
[tex]v \approx 50.266\,\frac{m}{s}[/tex]
The linear velocity of the particle is approximately 50.266 meters per second.
(iv) As particle rotates at constant speed, resultant acceleration ([tex]a[/tex]) is entirely radial and modelled by this expression:
[tex]a = \omega^{2}\cdot R[/tex]
[tex]a = \left(25.133\,\frac{rad}{s} \right)^{2}\cdot (2\,m)[/tex]
[tex]a \approx 1263.336\,\frac{m}{s^{2}}[/tex]
The acceleration experimented by the particle is approximately 1263.336 meters per square second.
Compute the magnitude of the magnetic field of a long, straight wire carrying a current of 1 A at a distance of 1 m away from it. Compare it with the Earth's magnetic field.
Answer:
Explanation:
Magnetic field due to a long wire
B = μ x 2I / 4π r where I is current and μ / 4π = 10⁻⁷ , r is distance from the wire
Putting the values
B = 10⁻⁷ x 2 x 1 / 1
= 2 x 10⁻⁷ T .
earth's magnetic field = 45 x 10⁻⁶ T = 450 x 10⁻⁷
So the magnetic field is 225 times less strong than earth's magnetic field .
What should Lidia do if she is planning to have children one day?
She should get married.
A potassium atom (atomic number 19) and a bromine atom (atomic number 35) can form a chemical bond through a transfer of one electron. The potassium ion that forms has 18 electrons.
Answer:
it will give one electron to the bromine atom, so the bromine atom will have 36 electrons. this is an ionic bonding
Explanation:
Answer:
The answer is C. I took the test and got it Right
Explanation:
APEX What is one advantage of using primary sources when doing research on an
experiment?
A. They are summaries of many scientists' work.
B. They include the opinions of many scientists.
C. They contain more details about the experiment.
D.They are always easier to read.
Answer:
C
Explanation:
They are first hand sources so they are more reliable and detailed...
One advantage of using primary sources when doing research on an
experiment is they contain more details about the experiment. The correct option is C.
What are primary sources?Primary sources are the one which are first hand sources. They are more reliable, so they are more reliable and detailed about the experiment.
Primary sources are the sources which produce their own energy to let other objects emit the same. Just like, Sun, it has has its own light and heat energy. It is reliable and can be experimented with more details.
Thus, the correct option is C.
Learn more about primary sources.
https://brainly.com/question/24511160
#SPJ2
Is it important to know the difference between atoms,ions,and isotopes
No. It's not important at all.
UNLESS you're going to read about them, write about them, study them, talk about them, or work with them. THEN it's pretty important.
A toy rocket travels at an initial velocity of 144 feet per second. The height of the rocket can be modeled by the function h(t)-144t-16t^2 where t is the time in seconds. When will the rocket return to the ground?
Answer:
t = 4.5 second
Explanation:
A toy rocket travels at an initial velocity of 144 feet per second. The height of the rocket can be modeled by the function as follows :
[tex]h(t)=-16t^2+144t[/tex]
t is time in seconds
We need to find the time when the rocket return to the ground.
When it reaches ground, h(t) = 0
So,
[tex]-16t^2+144t=0\\\\t(-32t+144)=0\\\\t=0\ \text{and} -32t+144=0\\\\t=0\ \text{and}\ t=4.5\ s[/tex]
So, at 4.5 second the rocket will return to the ground.
(8.62 x 10-2) - (1.94 x 10-2)
Answer:
66.8
Explanation:
hope this helps
Answer:
66.8Explanation:
[tex](8.62 \times 10 - 2) - (1.94 \times 10 - 2)[/tex]
Follow the PEDMAS order of Operation
[tex]8.62 \times 10 - 2 - 1.94 \times 10 + 2 \\ 86.2 - 2 - 19.4 + 2 \\ 86.2 - 2 - 17.4 \\ = 66.8[/tex]
A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop
Answer:
well, the hill isn't constantly going down hill, there's an ending point or goes back up hill making a v/u shape or there's nothing helping the wagon being pushed or pull currently
Explanation:
The force of gravity pulls down on your school with a total force of 400,000 newtons. The force of gravity pulling down on your school would be exactly twice as much if your school: a Had twice as much mass b Was twice as tall c Had twice as much volume d Covered twice as much area pleaseeee help
Answer:
A
Explanation:
Force of gravity can be expressed as:
F = GMM/R^2
Where
F = gravitational force
M = mass
R = distance
Also, W = mg
From the above equation, we can deduce that force of gravity actually depends on mass and not volume.
The correct answer is therefore A.
Had twice as much mass
Therefore, the force of gravity pulls down on your school with a total force of 400,000 newtons. The force of gravity pulling down on your school would be exactly twice as much if your school Had twice as much mass
a study where you try to observe subjects in a natural environment is a(n)
Answer:
i think it Naturalistic observation
Explanation:
How much time will have passed by the time a sample of an isotope has decayed to 6.25% of its original mass if the half-life is 15 days? 45 days 60 days 75 days 30 days
Answer:
60 days.
Explanation:
Let the original mass (N₀) = 1 g
Amount remaining (N) = 6.25% of its original mass
= 6.25% × 1
= 6.25/100 × 1
= 0.0625 g
Half life (t½) = 15 days
Time (t) =?
Next, we shall determine the rate of decay. This can be obtained as follow:
Decay constant (K) = 0.693/ half life
K = 0.693 / t½
Half life (t½) = 15 days
Decay constant (K) =?
K = 0.693 / t½
K = 0.693 / 15
K = 0.0462 / day
Finally, we shall determine the time taken for the sample of the isotope to decay to 6.25% of its original mass.
This can be obtained as follow:
Original amount (N₀) = 1 g
Amount remaining (N) = 0.0625 g
Decay constant (K) = 0.0462 / day
Time (t) =?
Log (N₀/N) = Kt/2.3
Log (1/0.0625) = 0.0462 × t / 2.3
Log 16 = 0.0462 × t / 2.3
1.2041 = 0.0462 × t /2.3
Cross multiply
0.0462 × t = 1.2041 × 2.3
Divide both side by 0.0462
t = (1.2041 × 2.3)/0.0462
t = 59.9 ≈ 60 days
Therefore, the time taken for the sample of the isotope to decay to 6.25% of its original mass is 60 days
A poster is 0.95m high and 1.0m wide how many digits follow the decimal point when the perimeter of the poster is expressed with the correct number of significant figures
A) zero digits
B) one digit
C)two digits
D)three digits
Explanation:
It is given that,
Length of the poster, l = 0.95 m
Breadth of the poster, b = 1 m
The poster is in the shape of rectangle. For a rectangular shape, perimeter is equal to :
P = 2(l+b)
P=2(0.95+1)
P=3.9 m
(b) One digits, P = 4 m
(c) Two digits, P = 3.9 m
(d) Three digits, P = 3.90 m
The mass of a cube is 16cm and the volume is 8cm3. What is the density?
Answer:
the density is 2
Explanation:
mass divided by volume is density
16 divided by 8 is 2
a car goes from 16 m/s to 2 m/s in 3.5 s what is the cars acceleration
Answer:4m/s^2
Explanation:
Vf=Vi+at
what are the uses of rockets
They are used to be able to go out of Earth and into space to Be able to explore and toBe able to prove and tell about Earth and space
The MSDS for benzene indicates that it is a clear liquid that has a substantial vapor pressure. It has a health rating of
2, a fire rating of 3, and a reactivity rating of 0. It is a cancer-causing agent.
Based on this information, which statement about benzene is accurate?
-Benzene readily reacts with moist air.
-Benzene explodes if the container is shaken.
-Benzene must be kept away from flames.
Benzene must be stored under high pressure.
Answer:
Benzene must be kept away from flames.
Explanation:
just took quiz
Answer:
Benzene must be kept away from flames.
Explanation:
A submarine took 9 hours to complete a journey. For the first 5
hours, it travelled at an average speed of 106 km/h. For the rest
of the journey, it travelled at an average speed of 125 km/h.
What was the total distance of the journey?
Answer:
1030 km
Explanation:
t= 9 hours
t1= 5 hours
s1= 106 km/h
d1 + d2= d
t1 + t2 =t
5 hours + t2 =9 hours
t2= 5 hours - 9 hours
t2= 4 hours
s2= 125km/h
d= ?
s= d/t
s1= d1/t1
106= d1/5
d1= 106 x 5
d1= 530km
s2= d2/t
125= d2/4
d2= 125 x 4
d2= 500km
d= d1 + d2
d= 530 + 500
d= 1030km
5. Lady Gaga needed someone to buy more meat for her meat dress. The famous
meat dress store is 40 miles from her house. Gaga drives a monster truck that gets
8000 meters per gallon. She only has 3 gallons of gas in her tank How many
miles can Gaga travel in her monster truck with only 3 gallons? Does Gaga have
enough gas to get to the store? If not, how far can she travel in meters?
Answer:
she can travel 24000 meters she cant reach the store she can get as much as 125 miles
Explanation:
What is the total mass of the object if the scale is balanced? (The black triangles show the location of the riders.) Do NOT include units with your answer. (Units would be grams). PLEASE HELP
If I'm understanding the picture, it looks like the riders add up to 117.8 .
how to find the acceleration of on object at a slope
Answer:
i need free points sry
Explanation:
Answer:
If the object is moving with an acceleration of +4 m/s/s (i.e., changing its velocity by 4 m/s per second), then the slope of the line will be +4 m/s/s.
hope this helps you
Which statements are included in the kinetic theory of matter? Select all that apply.
Answer:
There is empty space between matter's particles.
Matter's particles are in constant random motion or vibration.
Matter is made of small particles.
Explanation:
if the KE is increased by 4 times what will be the velocity
Answer: velocity would doubled
Explanation:
As we know the k.e relation is given by
K.E= 0.5 m v^2
Keeping the mass same and increasing the k.e 4 times makes the velocity double.
Help pleasei really need help it is hard
Answer:
A. The speed of light become slow because of the denser medium. The medium of plastic block is dencer then the medium of water. That's why the ray bend towards the incident.
B. Water has a higher optical density.
Which one of the 5W + H questions does the following statistic answer?
The world's fastest roller coaster reaches a speed of almost 150 miles per hour, requiring thrill-seekers to wear goggles when they ride!
(1 point)
How
Who
Where
When
Answer:Proven answer:: is How just did it online Connections A.
Explanation:
Answer:
How is the answer.
Explanation:
Which option is a force?
O A. Mass
O B. Velocity
O C. Acceleration
O D. Weight
Answer:
Weight is a force.
Explanation:
Force acting on an object is defined in terms of mass and its acceleration. Its mathematical force is given by
F = ma
Weight of an object is force that the Earth exerts on an object. It can be given by the formula as follows :
W = mg
g is acceleration due to gravity on the surface of earth
Hence, the correct option is (d).
Scientific models have two basic types. Please select the best answer from the choices provided T F
Answer:
Scientific models have two basic types. FALSE.
Hoped I helped