Answer:
True
Radiometric dating is a process of identifying the age of a material based on known half-lives of decaying radioactive materials found in both organic and inorganic objects. Radiometric dating is often used to determine the age of rocks, bones, and ancient materials.
Answer:
false
Explanation:
(ii) Describe how the acceleration of the train at time t = 100 s differs from the acceleration
at time t = 20 s.
Explanation:
Acceleration is the rate of change of velocity with time. When acceleration increases a body moves a faster velocity.
In the graph acceleration at time t= 100s is rapidly increasing. At t = 20s, the acceleration of the body is getting started up.A vehicle at time 100s will have a faster velocity compared to one at t = 20s
A car drove 10m east and then turned around and drove back 5m west. What is the total distance traveled and the displacement
Answer:
15m
Explanation:
the region between the cell membrane and the nucleus is called the_________
Answer:
Answer is the cytoplasm
what is one common product use microwaves
dont have much timeee
Answer:
Fluorescent Lights
Explanation:
Fluorescent light is one one common product use microwaves
How does microwaves workhe heat generated by the microwaves quickly and efficiently cooks or heats the food. Microwave ovens are known for their convenience and speed in preparing meals, as they can rapidly heat or cook food items. They are commonly used for tasks such as reheating leftovers, defrosting frozen food, or preparing quick meals.
It's worth noting that while microwaves are primarily used in microwave ovens, they also have various other applications in communication technology, radar systems, and scientific research.
Read more on microwaves here https://brainly.com/question/1304742
#SPJ6
According to Newton’s 2nd law of motion: objects at a rest will remain in rest unless acted upon
Answer:
True
Explanation:
It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton's Second Law applies.
- Hyperphysics
Answer:
true
Explanation:
because that's the answer
It takes some work for you to lift an object 20cm. How much work must you do to lift the same object 40cm?
Answer:
Twice the work needed to lift the 20cm object
Explanation:
Work done is derived using the expression below;
Work done = Force x distance
For this problem, we are lifting through a vertical height;
Work done = mg x h
mg is the weight of the body;
Since both bodies have the same weigh;
W1 is the workdone to lift 20cm
W2 is the workdone to lift 40cm
For the first lift;
W1 = (mg) x 20cm
(mg) = [tex]\frac{W1}{20}[/tex]
For the second lift;
W2 = (mg) x 40cm
Since they both have the same weight
(mg) = [tex]\frac{W2}{40}[/tex]
Equating the two weights;
[tex]\frac{W1}{20}[/tex] = [tex]\frac{W2}{40}[/tex]
20W2 = 40W1
W2 = [tex]\frac{40W1}{20}[/tex] = 2W1
Two drops of dilute sulphuric acid were added to 1 gm of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured solution got separated (step II). Step I and step II are:
Answer:
Both are physical changes
Explanation:
The dissolution of 1 gram of copper sulphate powder in a small amount of hot water in the presence of dilute H2SO4 is a physical change because no new substance was really formed in the process. This implies that step 1 is a physical change.
In step II, the hot liquid is allowed to cool leaving behind a beautiful blue coloured solution. This also is a physical change.
Hence both step I and step II are physical changes.
What if the frequency is now increased to f = 69 Hz, and we want to keep the impedance unchanged? (A) What new resistance should we use to achieve this goal? R = Ω (B) What is the phase angle (in degrees) between the current and the voltage now? ϕ = ° (C) Find the maximum voltages across each element.
Complete Question
A series RLC circuit has R = 405 Ω, L = 1.40 H, C = 3 µF. It is connected to an AC source with f = 60.0 Hz and ΔVmax = 150 V. What if the frequency is now increased to f = 69 Hz, and we want to keep the impedance unchanged? (A) What new resistance should we use to achieve this goal? R = Ω (B) What is the phase angle (in degrees) between the current and the voltage now? ϕ = ° (C) Find the maximum voltages across each element.
Answer:
A
[tex]R = 513.9 \ \Omega[/tex]
B
[tex]\theta = 34.79^o[/tex]
C
[tex]V_c =212.96 \ V[/tex] , [tex]V_L = 168.139 \ V[/tex] , [tex]V_R = 142.35 \ V[/tex]
Explanation:
From the question we are told that
The resistance is [tex]R = 405 \ \Omega[/tex]
The inductance is L = 1.40 H
The capacitance is [tex]C = 3 \mu F = 3 *10^{-6} \ F[/tex]
The original frequency is [tex]f = 60 \ Hz[/tex]
The new frequency is [tex]f_1 = 69 \ Hz[/tex]
Generally the reactance of the inductor is mathematically represented as
[tex]X_L = 2 \pi * f * L[/tex]
=> [tex]X_L = 2 * 3.142 * 60 * 1.40[/tex]
=> [tex]X_L = 527.5 \ \Omega[/tex]
Generally the reactance of the capacitor is mathematically represented as
[tex]X_c = \frac{1}{2 \pi * f * C}[/tex]
[tex]X_c = \frac{1}{2 * 3.142 * 60 * 3*10^{-6}}[/tex]
=> [tex]X_c = 884.6 \ \Omega[/tex]
Generally the impedance of the circuit is mathematically represented as
[tex]Z = \sqrt{[X_L - X_c ]^2 + R^2}[/tex]
=> [tex]Z = \sqrt{[527.5 -884.6 ]^2 + 405^2}[/tex]
=> [tex]Z = 540 \ \Omega[/tex]
Generally when the frequency is changed , the reactance of the inductor becomes
[tex]X_L' = 2 * 3.142 * 69 * 1.4[/tex]
=> [tex]X_L' = 607 \ \Omega[/tex]
Generally when the frequency is changed , the reactance of the capacitor becomes
[tex]X_c' = \frac{1}{2 * 3.142 * 69 * 3*10^{-6}}[/tex]
=> [tex]X_c ' = 768.8 \ \Omega[/tex]
Generally the new resistance is mathematically represented as
[tex]R ^2 = Z^2 - ( X_c' - X_L')^2[/tex]
=> [tex]R ^2 = 540^2 - ( 603 - 768.8 )^2[/tex]
=> [tex]R = \sqrt{264110.4}[/tex]
=> [tex]R = 513.9 \ \Omega[/tex]
Generally the phase angle is mathematically represented as
[tex]\theta = tan^{-1}[\frac{[X_L - X_C]}{R} ][/tex]
=> [tex]\theta = tan^{-1}[\frac{[ 884.6 - 527.5]}{513.92} ][/tex]
=> [tex]\theta = 34.79^o[/tex]
Generally the maximum current flowing through the circuit is mathematically represented as
[tex]I_{max} = \frac{\Delta V}{ Z}[/tex]
=> [tex]I_{max} = \frac{150}{540 }[/tex]
=> [tex]I_{max} = 0.2778 \ A[/tex]
Generally the maximum voltage across the capacitor is
[tex]V_c = I_{max} * X_c'[/tex]
[tex]V_c = 0.2778* 768.8[/tex]
=> [tex]V_c =212.96 \ V[/tex]
Generally the maximum voltage across the inductor is
[tex]V_L = I_{max} * X_L[/tex]
[tex]V_L = 0.2778* 607[/tex]
=> [tex]V_L = 168.139 \ V[/tex]
Generally the maximum voltage across the resistor is
[tex]V_R = I_{max} * R[/tex]
[tex]V_R = 0.2778* 513.9[/tex]
=> [tex]V_R = 142.35 \ V[/tex]
A 0.15 kg baseball and a 7.25 kg bowling ball are both rolling along at 3 m/s. which object is easier to stop and why?
A) the bowling ball because it has less inertia
B) the baseball because it has more inertia
C) the bowling ball because heavy objects are naturally prone to stop their own
D) the baseball because it has less inertia
Expresa, en unidades del Sistema Internacional, la siguiente cantidad: 5,6 · 103 cm2 Expresa el resultado en notación científica. Respuesta:Expresa, en unidades del Sistema Internacional, la siguiente cantidad: 5,6 · 103 cm2 Expresa el resultado en notación científica. Respuesta:
Answer:
La cantidad equivale a [tex]5,6\times 10^{-1}[/tex] metros cuadrados.
Explanation:
El Sistema Internacional de Pesos y Medidas utiliza el metro como unidad de longitud y, por extensión, el metro cuadrado como unidad de área. Si sabemos que un metro cuadrado equivale a 10000 centímetros cuadrados, entonces tenemos que su equivalente en unidades del Sistema Internacional en notación científica es:
[tex]x = 5,6\times 10^{3}\,cm^{2}\times \left(1\times 10^{-4}\,\frac{m^{2}}{cm^{2}}\right)[/tex]
[tex]x = 5,6\times 10^{-1}\,m^{2}[/tex]
La cantidad equivale a [tex]5,6\times 10^{-1}[/tex] metros cuadrados.
A runner is training and runs past meter mark 65 and starts a stopwatch. After the runner passes meter mark 15 the stopwatch stops at 8 seconds.
What was the runners velocity?
Question options:
-6.25 m/s
6.25 m/s
8.13 m/s
-1.88 m/s
Answer:
6.25 m/s
Explanation:
Given parameters
Initial mark = 65
Final mark = 15
time taken = 8s
Unknown:
Velocity of the runner = ?
Solution:
Velocity is the displacement divided by time;
Velocity = [tex]\frac{displacement}{time}[/tex]
Displacement = Initial mark - final mark = 65 - 15 = 50m
Now, insert the parameters and solve;
Velocity = [tex]\frac{50}{8}[/tex] = 6.25m/s
A 45 kg swimmer starting from rest can develop a maximum speed of 12 m/s over a distance of 20 m. How much net force must be applied to do this?
If a 45 kg swimmer starting from rest can develop a maximum speed of 12 m/s over a distance of 20 m , then the net force must be applied to this would be 162 Newtons .
What is work done?The total amount of energy transferred when a force is applied to move an object through some distance .
Work Done = Force × Displacement
As given in the problem a 45 kg swimmer starting from rest can develop a maximum speed of 12 m / s over a distance of 20 m.
The total work done = 0.5 × 45 × 12²
= 3240 Joules
3240 = Force × 20
Force applied on the crate = 3240 / 20
= 162 Newtons
Thus, the net force that must be applied to this would be 162 Newtons .
To learn more about the work done, refer to the link ;
brainly.com/question/13662169
#SPJ2
People on here are soooo smart I wish I could be like that
Answer:
3600J
Explanation:
The amount of energy transferred in two minutes by the given heater is 3600J of energy.
This energy causes a transfer of kinetic energy to the copper. To solve this problem;60 seconds = 1 minutes
In two minutes, the number of seconds = 2 x 60 = 120seconds
So, on the table, at 120 seconds, 3600J of energy would have been transferred.
What are the vector scalar pairs?
Answer:
Explanation:
is there more to the problem?
The heaviest loads ever raised were part of the offshore Ekofisk complex in the North Sea. The 4.0x 10 kg complex was raised 6.5 m by over a hundred hydraulic jacks. The work done on the complex during the raising was approximately 2.6x 101 J. Suppose the power output of all the jacks was 5.7x 10 W. How long did it take the jacks to raise the complex?
Answer:
0.5s
Explanation:
Given parameters:
Mass of the complex = 4 x 10kg
Distance moved = 6.5m
Work done = 2.6 x 10¹J
Power = 5.7 x 10W
Unknown:
Time taken = ?
Solution:
Power is the rate at which work is done.
Power = [tex]\frac{work done}{time}[/tex]
work done = power x time
time = [tex]\frac{work done }{power}[/tex]
Insert the parameters;
time = [tex]\frac{260}{570}[/tex] = 0.5s
A computational model predicts the maximum height that a roller coaster car can reach when the lowest height of its journey is at ground level, where it has a speed of 20 m/s. Given these conditions, what is the maximum height?(1 point)
196 m
4.8 m
20.4 m
2.0 m
Answer: 20.4 m
Explanation: [tex]\frac{9.8^{2} }{Velocity} = Max Height[/tex]
The answers to this test are:
1. What is the maximum speed when the conditions are mass = 450 kg, initial height = 30 m, and the roller coaster car is initially at rest?
24.2 m/s
2. A computational model predicts the maximum height that a roller coaster car can reach when the lowest height of its journey is at ground level, where it has a speed of 20 m/s. Given these conditions, what is the maximum height?
20.4 m
3. A computational model predicts the speed of a roller coaster car at different heights given its speed at the lowest height of its journey, which is at ground level. The speed at the lowest point is 30 m/s. What is the prediction for its speed when it is at a height of 20 m?
22.5 m/s
4. A computational model predicts the maximum potential energy a roller coaster car can have given its mass and its speed at the lowest point of its journey. Its mass is 350 kg, and it speed at a height of 0 m is 25 m/s. What is the prediction for its maximum potential energy?
109,375 J
5. What is the benefit of using simple computational models in a spreadsheet application, like the one used in this course, to predict mechanical energy and related values?
It is easy to calculate new scenarios.
a physics instructor conducts a projectile motion demonstration. The device used will drop one steel ball and horizontally launch another. If no air resistance is presented which steel ball, the one launced or the one dropped, striked the ground first?
(a) The launched ball
(b) The dropped ball
(c) both hit a the same time
(d) neither hit the ground
Answer:
Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. The object is called a projectile, and its path is called its trajectory. The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. In this section, we consider two-dimensional projectile motion, such as that of a football or other object for which air resistance is negligible.
Explanation:
B the dropped ball
What would a Bohr model of sodium look like
Answer:
A Bohr model for sodium shows that it has eleven protons and neutrons inside the nucleus, with its eleven electrons orbiting in three energy levels.
Explanation:
Hope this helps
What organs are part of the Digestive System?
Answer:
The alimentary tract of the digestive system is composed of the mouth, pharynx, esophagus, stomach, small and large intestines, rectum and anus. Associated with the alimentary tract are the following accessory organs: salivary glands, liver, gallbladder, and pancreas.
The picture below shows Earth:
A. rotating
B. revolving
C. orbiting
D. stopping
The figure shows about the rotating earth.
To find the correct option among all the options, we need to know about the rotation state of earth.
What is rotation of earth?Motion of earth about its own axis is known about its rotation motion.
How does rotation motion different from orbital or revolving motion?In revolving and orbital motion, an object moves around an axis out side of that bulk of object in a certain orbit, while in rotational motion, the object moves around its own axis.
How is rotation motion represented?Rotation motion is represented by drawing an axis in the bulk of object and to indicate the rotation a circular arrow is drawn.
Thus, we can conclude that the figure shows about the rotating earth.
Learn more about rotation motion here:
brainly.com/question/20319147
#SPJ2
what is force applied per unit area
Answer:
Pressure is defined as force per unit area. The standard unit for pressure is the Pascal, which is a Newton per square meter.
P= A/F
Answer:
force per unit area - the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit); "the compressed gas exerts an increased pressure" pressure, pressure level.
An object is fired with a velocity of 130 ft/s at 60 degrees above the horizontal. Analyze this motion, finding all of the following: Velocity components in both x and y, time, distance traveled, and maximum height reached. NEED ANSWER ASAP
State the career function of building engineering
Answer:
Building engineers analyze reports, help to design structures, and manage contracts and budgets.
Explanation:
Science ck-12 green house effect
Answer:
what about it i need more info
Explanation:
friction always opposes ___________ motion
If a fish experiences an acceleration of 4.9 m/s over a period of 1.84 a , what was the change in velocity
Explanation:
they'll dewwel jss q.v hewn red f quill DC noo
what factors limit the accuracy of a potentiometer and what was the objective of reversing the terminals of the cell
Explanation:
"The accuracy of a potentiometer can be increased by decreasing the potential gradient across the potentiometer wire, and this can be achieved by increasing the length"
The factors that are affecting/limiting the accuracy of the potentiometer are:
The specific resistance of the material of the potentiometer wire.The potential gradientThe current passing through the potentiometer wire. Area of a cross-section of the wire Internal temperature.
The objective of reversing the terminals of the cell
If the jockey of the potentiometer is pressed for a long time, joule heating sets in, so that reversing the terminals of the potentiometer will prevent the resistance due to joule heat from being added to the measured resistance, ultimately preventing unwanted resistance
The diagram shows a box in the periodic table. 14 Si Silicon 28.1 What is the atomic mass of the element shown? O A. 14 B. 56 o C. 281 D. 42.1
Answer:
28.1
Explanation:
The number 14 is it's atomic number, the Si is the atomic symbol, and 28.1 is the atomic mass.
Hope this helps!
Answer:
28.1
Explanation:
got it correct on my test.
Weight
A) exists independent of gravity
B) is the force of gravity upon an object
C) the same as mass
D) the force that keeps things on the surface of earth
Answer:
B) is the force of gravity upon an object
Explanation:
Weight is the force of gravity acting upon an object.
Weight is dependent upon the force of gravity acting on a bodyIt is mathematically expressed as;
Weight = mass x acceleration due to gravity
Mass is the amount of matter in a substance, it exists independently of gravity
A book with a mass of 8 kg is at rest on a horizontal surface of a table, as shown below.
The magnitude of the normal force acting on the book is -
A.8
B.40
C.80
D.100
Answer:
N = 80 N
Explanation:
Given that,
Mass of a book, m = 8 kg
We need to find the magnitude of the normal force acting on the book. Normal force acting on an object is balanced by its weight such that,
N = mg
g is the acceleration due to gravity
[tex]N=8\ kg\times 10\ m/s^2\\\\N=80\ N[/tex]
So, the correct option is (c) "80 N".
