C. It is answered by observation and evidence.
Good scientific explanations are defined, measurable and controllable. They can be answered by an experiment.
Convert the following in to SI units without changing its values
a. 4000 g.
b. 2.4 km
#A
[tex]\boxed{\sf 1kg=1000g}[/tex]
[tex]\\ \sf\longmapsto 4000[/tex]
[tex]\\ \sf\longmapsto \dfrac{4000}{1000}[/tex]
[tex]\\ \sf\longmapsto 4kg[/tex]
#B
[tex]\boxed{\sf 1km=1000m}[/tex]
[tex]\\ \sf\longmapsto 2.4km=2.4(1000)[/tex]
[tex]\\ \sf\longmapsto 2400m[/tex]
2. Determine the units of the quantity described by each of the following
combinations of units:
a. kg (m/s) (1/s) b. (kg/s) (m/s)
c. (kg/s) (m/s) d. (kg/s) (m/s)
Explanation:
a.) kg(m/s)(1/s) = force (N)
b.) (kg/s)(m/s) = force (N)
c.) (kg/s)(m/s) = force (N)
d.) (kg/s)(m/s) = force (N)
The units of the quantity described by each of the following
combinations of units are the Newton
Force is defined as the product of mass and acceleration of the body. The unit of force is Newton or kgm/s². Mathematically,
Force = mass* acceleration
Unit of mass = kg
Unit of acceleration = m/s²
Unit of Force = kg * m/s²
Unit of force is therefore also expressed as kgm/s²
According to the option given:
kg (m/s) (1/s) = kgm/s² (Thisis also equivalent to Newton)
We can also see that the other option when multiplied together will give kgm/s² which is also expressed in Newton (N)
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Suppose you throw a baseball (mass of 145 g) in the air with a force of 300 N.
What is its acceleration?
Answer:
A = 43.5 m/sec^2
Explanation:
A = F x m
Must turn g into kg
A = 300 N x 0.145 kg
A = 43.5
Hope this helps :)
4.
Assume that the center of the Tacoma Narrows Bridge roadway is about 60 m above the water. Ignore air
resistance.
How long would it take for a rock dropped from the bridge to reach the water?
a.
b. How fast would the rock be moving just before striking the water?
Answer:
iflwhat do I put in the fridge to get a better for my hair and I will get a better for sure I will get a
Explanation:
no
try not Helpful 6Helpful Question What are you doing a good job and why is this article is for you and I am going up to the store
Discuss one way in which global warming aggravates the effect of radiation
A robot used in a pharmacy picks up a medicine bottle at t=0. It accelerates at 0.25 m/s2 for 6.5 s , then travels without acceleration for 57 s and finally decelerates at -0.60 m/s2 for 2.7 s to reach the counter where the pharmacist will take the medicine from the robot.
The acceleration-time graph is used to show the relationship between the acceleration of a body and time.
Let:
[tex]a \to[/tex] acceleration
[tex]t \to[/tex] time
From the question, we have the following parameters:
[tex](a_1,t_1) = (0,0)[/tex]
[tex](a_2,t_2) = (0.25,6.5)[/tex] ---- when the robot accelerates
[tex](a_3,t_3) = (0,57)[/tex] ----- when the robot travels without acceleration
[tex](a_4,t_4) = (-0.60,2.7)[/tex] ---- when the robot decelerates
To represent this on an acceleration time graph, we consider the following:
When the robot accelerates, the line on the graph increases in a right upward directionWhen the robot travels without acceleration, the acceleration is represented with a horizontal line. This simply means that acceleration is 0When the robot decelerates, the line on the graph decreases in a right downward directionThe total time (t) spent by the robot is 66.2 seconds
This is calculated as follows:
[tex]t = 6.5 + 57 + 2.7[/tex]
[tex]t = 66.2[/tex]
See attachment for the acceleration time graph (not drawn to scale)
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moment of inertia of uniform rod
define it.
Explanation:
Hopefully the picture is clear and understandable
:)
Answer:
a quantity expressing a body's tendency to resist angular acceleration, which is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.
Compare magnitude electrical and gravitational forces exested on an object mass=10g , charge=20sec by an identical object that is placed 10cm from the first object?
Answer:
[tex]\frac{F1}{F2}[/tex]=5.4*[tex]10^{26}[/tex]
Explanation:
Let
F1=Electric force
F2=Gravitational Force
F1=[tex]\frac{kq^{2} }{r^{2} }[/tex]
F2=[tex]\frac{Gm^{2} }{r^{2} }[/tex]
[tex]\frac{F1}{F2}[/tex] = [tex]\frac{\frac{kq^{2} }{r^{2} } }{\frac{Gm^{2} }{r^{2} } }[/tex]
[tex]\frac{F1}{F2}[/tex] = [tex]\frac{kq^{2} }{Gm^{2} }[/tex]
[tex]\frac{F1}{F2}[/tex] =[tex]\frac{9*10^{9}*(20)^{2} }{6.67*10^{-11} *(0.01)^{2} }[/tex]
[tex]\frac{F1}{F2}[/tex] = 5.4*[tex]10^{26}[/tex]
how much work does a man perform on a lawnmower if he applies 25 N of force to push it 100 meters
[tex]\\ \sf\longmapsto Work\:Done=Force\times Displacement[/tex]
[tex]\\ \sf\longmapsto Work\:Done=25(100)[/tex]
[tex]\\ \sf\longmapsto Work\:Done=2500J[/tex]
Explanation:
Solution,
Given:-
Force applied (F)=25 NDistance travelled (S)=100mBy the formula of work, we have
W=F×SW=25×100W=2500 JSo, the work done is 2500 J.
1.Convert 8.1 kilograms into grams.
2.Convert 376 centimeters into meters.
3 Convert 68 centimeters into feet.
Answer:
See below.
Explanation:
1. 8.1 kg = 8100 g
2. 376 cm = 3.76 m
3. 68 cm ≈ 2.23 ft
A machine has mechanical advantage 2, what does it mean
Answer:
Mechanical advantage MA is the ratio of output (generated by the machine) force to input (applied to the machine) force. So MA = 2 means that for example if you apply 100 N then your machine will multiply that force and generate 200 N.
Source = Wikipedia
I Hope IT WILL HELP YOU A LOT.
Which correctly describes electric potential, electric field, and electric (or electrostatic) force?
a. The potential, the field, and the force are vector quantities.
b. The potential, the field, and the force are scalar quantities.
c. The potential and the field are scalar quantities, and the force is a vector quantity.
d. The potential and the force are vector quantities and the field is a scalar quantity.
e. The potential is a scalar quantity, and the field and the force are vector quantities.
f. The potential and the force are scalar quantities, and the field is a vector quantity
Answer:
E
Explanation:
A vector is a physical quantity that has magnitude and direction while a scalar is a physical quantity that has magnitude only
*electric potential is a scalar quantity because it only has magnitude
*electric field and electric force are vector quantities because they have magnitude and direction
Select the correct answer.
Calculate the force of gravity on a 1–kilogram box located at a point 1.3 × 107 meters from the center of Earth. (The value of G is 6.673 × 10-11 newton meter2/kilogram2. The mass of Earth is 5.98 × 1024 kilograms.)
A.
2.36 newtons
B.
3.58 newtons
C.
4.87 newtons
D.
8.95 newtons
Answer:
A. 2.36 Newtons
Explanation:
F = GmM/d²
F = 6.673 x 10⁻¹¹(1)(5.98 x 10²⁴) / (1.3 x 10⁷)²
F = 2.36121...
Very poor question design.
mass of box... 1 significant digit
distance... 2 significant digits
mass of earth... 3 significant digits
value of G... 4 significant digits
Answer precision to 3 significant digits is not justifiable
what is an adam and a moreculw and a half note ???
A car travelling at a speed of 40 m/s slows to 10 m/s in 5 seconds. The acceleration of the car is
Answer:
[tex]\boxed {\boxed {\sf -6 \ m/s^2}}[/tex]
Explanation:
Acceleration is the change in velocity with respect to time. We are given the velocity and time, so we will use the following formula to find acceleration.
[tex]a= \frac {v_f-v_i}{t}[/tex]
The car slowed down, so the final velocity was 10 meters per second and the initial velocity was 40 meters per second. It slowed down in 5 seconds.
[tex]v_f[/tex]= 10 m/s[tex]v_i[/tex]= 40 m/st=5 sSubstitute these values into the formula.
[tex]a= \frac{ 10 \ m/s - 40 \ m/s}{5 \ s}[/tex]
Solve the numerator and subtract.
[tex]a= \frac{ -30 \ m/s}{5 \ s}[/tex]
Divide.
[tex]a= -6 \ m/s/s[/tex]
[tex]a= -6 m/s^2[/tex]
The acceleration of the car is -6 m/s² or -6 meters per second squared. The acceleration is negative because the car slowed down.
A force acting on a moving ball causes its motion to change. This force stays constant.
What makes the force produce a greater change in the motion of the ball.
Answer:
you stop the ball or bring it to a different direction
Explanation:
i don't know if this helps. i didn't take physics yet. but i hope this helps.
If the force remains constant, then the decrease in the mass of the ball will increase the acceleration of the ball.
What is force?Force acting on a body can be defined as the changes in the state of the body of motion or rest. Force can change the speed and the direction of the moving body. The force acting on an object is related to factors which are mass and acceleration of the body.
The mathematical expression from the 2nd law of motion for force can be written as:
F = ma
We can express this equation as:
a ∝ 1/m
Therefore, the acceleration of a moving body is inversely proportional to the mass of that body.
Therefore, if we are applying the constant force on the ball, then this force can produce a greater change in the motion of the ball only if the mass of the ball will be less. Then the acceleration of the moving ball will increase.
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a ball tied to a string is rotating in a horizontal circle with a radius 1.5 m and angular speed 3.5rad/s.calculate it's centripetal acceleration?
Answer:
ac = ω²R = 3.5²(1.5) = 18.375 ≈ 18 m/s²
A car traveling at 90 m/s can stop in a distance of 110 m. What is the magnitude of the cars acceleration as it slows down?
I think I have already answer this question. Anyways please do let me know whether it is useful or not
what do you mean by mass of object is 7 kg
Explanation:
Mass=7 kg means that it weights 7 kg while measuring on beam balance .
A horse track is a loop where the starting point and the finish line are at the same point. A horse gallops around a 400 m track in 20 s. Calculate the velocity of the horse
A.20 m/s
B.0.05 m/s
C.0 m/s
D.40 m/s
The velocity of the horse is 0 m/s, so the correct option is C.
The velocity is a vector that is given by the rate of change of the displacement.
[tex] v = \frac{d}{t} [/tex]
Where:
d: is the displacement
t: is the time
Since in the horse track the starting point and the finish line are at the same point, the velocity of the horse is zero because the velocity depends on the direction of the displacement, and here the displacement is zero (the horse returns to the starting point).
Therefore, the correct option is C: 0 m/s.
You can learn more about velocity here:
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I hope it helps you!
Answer:
The velocity of the horse is 0 m/s:
Correct answer is C.
Arrange the types of refracting telescopes in order of stability
Answer:
1. Astronomical telescope.
2. Terrestrial telescope.
3. Galilean telescope.
Explanation:
[tex].[/tex]
Which of the following materials can be charged: plastic, glass, metal? 
• This question comes from the study of electrostatics.
Materials that can be charged from the options are; plastic and glass.
• Now, among the 3 listed materials, plastic and glass are insulators whereas metal is a conductor because it can conduct electricity.
• With respect to insulators and conductors as regards charging by electrostatics, we can say that in conductors if you charge a portion of them, the charges inside will have the freedom of movement. However, inside of the material, If a charge is added in another portion of the conductor, the previously introduced charges will combine to neutralize this new charge.
• With respect to insulators, the charges that are put at the surface of the object will remain there because unlike conductors, these insulators do not allow for freedom of movement of charges inside the material that could neutralize.
• Thus, the materials that can be charged by rubbing are plastic and glass.
• Read more here; brainly.in/question/32842271
When are theories constructed?
A. after data is collected from an experiment
B. after there is numerous data collected during the experiment
Hi, This is the answer...
Theories are constructed after there is numerous data collected during the experiment.
Hope it helps you...Pls mark brainliest if it helps you....(by Benjemin)
The correct answer is B.
Theories are constructed after there is numerous data collected during the experiment.
Theory construction is simply a process of formulating and bringing together different components of theories into a single form that is more meaningful.
These theories are usually supported by evidence (data) gathered from many experiments.
In addition, these theories may answer the basic questions of our universe such as;
how does nature work? and,why it exhibits certain characteristicsThus, from the given options, only option B matches the above explanations.
"theories are constructed after there is numerous data collected during the experiment"
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9. A vehicle accelerates from rest to a final velocity of 12 m/s. Its acceleration is 3 m/s2. How far does the vehicle
travel?
Answer:
not enough info i need to know what the time is
Explanation:
A highly volatile substance has an initial mass of 1200 g and its mass is reduced by 12% each second.
a Write a formula that gives the mass of the substance (m) at time (t) seconds.
b Rearrange this formula to make t the subject.
C What mass remains after 10 seconds, correct to 2 decimal places?
d Calculate how long (to the nearest second) it takes until the mass is 10 grams.
e After how many seconds (to the nearest second) is the mass less than 1 gram?
Answer:
Explanation:
a) 1.00 - 0.12 = 0.88
m = 1200(0.88)^t
b) t = ln(m/1200) / ln(0.88)
c) m = 1200(0.88)^10 = 334.20 g
d) t = ln(10/1200) / ln(0.88) = 37.451... = 37 s
e) t = ln(1/1200) / ln(0.88) = 55.463... = 55 s
what is the difference between the pressure exerted by a solid and that by liquid?
Answer:
• Pressure inside liquids are due to the random movement of the liquid molecules and the weight of the liquid. The pressure inside solids occurs only due to the weight of the solid.
• The liquid pressure acts on the sides of the liquid as well as the bottom. The pressure due to solids only appears at the bottom of the solid.
A rocket blasts off and accelerates upward from rest with a rate of 15.4 m/s2. Calculate the
distance it will rise in 22 seconds.
NEED HELP!!
From question we have,
Inital velocity(u) = 0Accleration(a) = 15.4 m/s²Time taken(t) = 22 secNow, from the second equation of motion;
s = ut + ½at² { where s = distance covered }Just put all the values provided in the question, in this equation;
s = ut + ½at²s = (0 × 22) + ½ × 15.4 × 22 × 22s = 15.4 × 11 × 22s = 15.4 × 242s = 3726.8 mTherefore, distance it will rise in 22 seconds will be 3726.8m
If the solar system were the size of your campus, how far away would the nearest star be?
About a mile away.
About 100 miles away.
About 2,000 miles away.
An infinite distance away.
The solar system is very large with the boundaries located around the Orth cloud 100,000 Astronomical Units away
The correct option for, the distance to the nearest star if the solar system were the size of a campus is the option;
About a mile away
The reason the above selection is correct is as follows:
The nearest star to the solar system is Proxima CentauriThe distance of the nearest star to the solar system from Earth is 40,208,000,000,000 kilometers awayThe area of the solar system is about (π × (10⁵ × 149.6 × 10⁶)²) km²The size of one of the largest campus can be taken as 27,000 acres = 109.2651 km²The ratio of the area of the solar system to the area of a campus = (π × (10⁵ × 149.6 × 10⁶)²)/(109.2651) = 6.4347487 × 10²⁴
Therefore, the linear scale factor ≈ √(6.4347487 × 10²⁴) ≈ 2.5366807 × 10¹²
Therefore, the corresponding distance to the distance of the nearest star to the solar system, X is given as follows;
X = (40,208,000,000,000 km)/(2.5366807 × 10¹²) ≈ 15.85 km ≈ 9.85 miles
Given that compared with the largest campus the distance is at most approximately 9.85 mile, if the solar system is taken to be a much smaller campus, the distance of the closest star Proxima Centauri will be about a mile away
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1. After 2 hours, the displacement of a car is 150 km north. The initial displacement of the car is 0. What is the average velocity of the car
Total displacement of the car = (0+150) Km = 150 Km
Total time taken = 2 hours
Average velocity = 150/2 Km/h = 75 Km/h
A car travels 150 km in the north direction and it takes 2 hours to cover the distance then the velocity of the car will be 75 km/hr.
What is Velocity?Velocity is the rate at which a moving object's direction changes as perceived from a certain vantage point and measured by a particular unit of time. Kinematics, the area of special relativity that investigates how bodies move, starts with the fundamental idea of speed.
In order to be explained, the scientific vector quantity known as velocity needs to have both a magnitude and a direction.
As per the provided information in the question,
The total displacement, D = 150 km north.
Total time is taken by the car, t = 2 hours.
Then, the velocity (v) of the car will be,
v = D/t
v = 150/2
v = 75 km/hr.
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If it takes Tanya 9.4 hours to get to her cousin's house while driving an average of 40 mph, how far away does her
cousin live?
Answer:
376 miles
Explanation:
speed = distance / time
therefore distance = speed * time
distance = 40 miles/hr * 9.4 hr
then
distance = 375 miles
