Answer:
D
Explanation:
It is important that we have two variables, Independent
and Dependant Variable.
Your dog runs in a straight line for a distance of 43m in 28s
What is your dog's average speed?
Answer:
Explanation:
Hope this helps!
Which of the following statements is true?
Answer:
Aluminum and steel are good conductors of electricity.
Explanation:
1) All materials are good conductors of electricity.
This is false because nonmetal materials such as plastic or wood cannot conduct electricity.
2) Aluminum and steel are good conductors of electricity.
This is true. All metals are conductors of electricity.
3) Gold and wood are poor conductors of electricity.
This is false. Although gold can conduct electricity, wood can't.
4) Plastic and copper are good conductors of electricity.
This is false. Although copper can conduct electricity, plastic can't.
I hope this helps!
Answer:
B) Aluminum and steel are good conductors
Explanation:
entific findings are useful
3. Field reports require the student to analyze his or her observations of
phenomena or events in the real world in light of theories studied in the
course
True or false?
That's true. The give-away is "observation ... in the real world". That's what "field reports" are.
The part I'm not so sure about is those "entific findings".
Scientific findings are the overall process involves making conjectures (hypotheses), deriving predictions from them as logical consequences, and then carrying out experiments based on those predictions to determine whether the original conjecture was correct.
What is a scientific finding?The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century (with notable practitioners in previous centuries). It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation.
It involves formulating hypotheses, via induction, based on such observations; experimental and measurement-based testing of deductions drawn from the hypotheses; and refinement (or elimination) of the hypotheses based on the experimental findings. These are principles of the scientific method, as distinguished from a definitive series of steps applicable to all scientific enterprises.
Although procedures vary from one field of inquiry to another, the underlying process is frequently the same from one field to another. The process in the scientific method involves making conjectures (hypothetical explanations), deriving predictions from the hypotheses as logical consequences, and then carrying out experiments or empirical observations based on those predictions. A hypothesis is a conjecture, based on knowledge obtained while seeking answers to a question.
To know more about scientific findings follow
https://brainly.com/question/968894
A vibration platform oscillates up and down with a fixed amplitude of 9.7 cm and a controlled frequency that can be varied. If a small rock of unknown mass is placed on the platform, at what frequency will the rock just begin to leave the surface so that it starts to clatter?
Answer:
1.6 Hz
Explanation:
In simple harmonic motion, acceleration is given by the formula;
a = Aω²
Where;
A is amplitude
ω is angular velocity.
We are given A = 9.7 cm = 0.097 m
We know that acceleration due to gravity is 9.8 m/s².
Thus;
9.8 = 0.097ω²
ω² = 9.8/0.097
ω = √101.031
ω = 10.05 rad/s
Formula for frequency is;
f = ω/2π
Thus;
f = 10.05/2π
f = 1.6 Hz
In this diagram, heat energy is being added over time. The vertical axis shows an increase in temperature, and the horizontal axis shows the passage of time. What is happening to the temperature at Point B?
1. The temperature is rising as the molecules break apart from each other.
2. The temperature is not rising because the heat is being used to break the connections between the molecules.
3. The temperature is dropping as the molecules break apart from each other.
4. The temperature is not rising because the molecules are slowing down.
Answer:
2. The temperature is not rising because the heat is being used to break the connections between the molecules.
Explanation:
I remember doing this question and this is the correct answer i just know it by heart.
just trust me by the heart
Peron Company uses a perpetual inventory system and the net method of recording invoices. The company purchased merchandise on November 4 at a $2,000 invoice price with terms of 2/10, n/30.
Answer: See explanation
Explanation:
From the information given in the question, the journal entry is written below:
Debit: Merchandise inventory 1960
Credit: Account payable 1960
(To record purchase)
Note that 1960 was gotten as:
= 2000 × 98%
= 2000 × 0.98
= 1960
Note that 2% discount was given.
What is the melting point of substance A?
Answer:
200 Degrees Celsius
Explanation:
write down an example scenario of an object that has acceleration
Answer:
An object which experiences either a change in the magnitude or the direction of the velocity vector can be said to be accelerating. This explains why an object moving in a circle at constant speed can be said to accelerate - the direction of the velocity changes.
if a car turns a corner at constant speed, it is accelerating because its direction is changing. The quicker you turn, the greater the acceleration. So there is an acceleration when velocity changes either in magnitude (an increase or decrease in speed) or in direction, or both.
Explanation:
According to the Law of Universal Gravitation, which scenario would generate the most
gravitational force?
2 turtles, 20 m apart
2 turtles, 200 m apart
2 turtles, 2000 m apart
Answer:
im not 100 percent but its probably 2 turtles 20m apart
___________ are things that a scientist keeps the same during an experiment.
Question 4 options:
Constants
Control
Independent Variable
Dependent Variable
Answer:
independent variable
Explanation:
A body having mass 200g id moving with velocity 120m\s. What is its power
Answer:
P = 24 watts
Explanation:
Given that,
Mass, m = 200 g = 0.2 kg
Velocity of the body, v = 120 m/s
We need to find the power of the body. The formula for power is given by :
P = Fv
Here, F = W (weight) i.e. mg
So,
P = 0.2 × 120
P = 24 Watts
So, the power of the body is 24 watts.
Which physical law most directly describes the motions of objects that are acted on by forces?
A.
Newton's law of universal gravitation
B.
Newton's second law of motion
C.
Coulomb's law of electrostatic interaction
D.
the conservation of mass law
Answer: Newton's second law of motion
Explanation:
In Spanish, count to 1000 in hundreds. (100, 200, 300, 400…1000) You will be graded on (a) pronunciation and (b) correct number vocabulary.
How much heat is needed to warm 0.052 kg of gold from 30C to 120C
Answer:
90 degrees Celsius
Explanation:
120-30 = 90
In the following problems, assume the following parameters:
Mass of the bottom steel disc: 1.468 kg.
Mass of the upper steel disc: 1.479 kg.
Mass of the upper aluminum disc: 0.461 kg.
Radius of each disc: 63.3 mm.
Radius of the take-up spool: r= 1.25 cm.
Mass of the falling weight: 25 grams.1.
1. Using the values given above, calculate the following:
a. The moment of inertia of the lower, steel disc.
b. The moment of inertia of the upper, steel disc.
c. The moment of inertia of the upper, aluminum disc.
d. The combined moment of inertia of the two steel discs.
2. Using the results of problem 1, what percentage error is made by neglecting mr2with respect to Iin equation (95)?
3. Suppose that the counter is reading 400 counts per second at some moment. What is the value of Ïat that moment?
Answer:
1) a) I₁ = 0.2941 kg m², b) I₂ = 0.2963 kg m², c) I_{total} = 0.5904 kg m²
3) α = 6.31 10⁶ rad / s²
Explanation:
1) The moment of inertia for bodies with high symmetry is tabulated, for a divo with an axis passing through its center is
I = ½ m r²
a) moment of inertia of the upper disk
I₁ = ½ m₁ r₁²
I₁ = ½ 1,468 0.633²
I₁ = 0.2941 kg m²
b) upper aluminum disc moment of inertia
I₂ = ½ m₂ r₂²
I₂ = ½ 1.479 0.633²
I₂ = 0.2963 kg m²
c) the moment of inertia is an additive scalar quantity therefore
I_{total} = I₁ + I₂
I_{total} = 0.2941 + 0.2963
I_{total} = 0.5904 kg m²
3) ask the value of the angular acceleration, that is, the second derivative of the angle with respect to time squared
indicate the angular velocity of the system w = 400 rev / s
Let's reduce the SI system
w = 400 rev / s (2π rad / rev) = 2513.27 rad / s
as the system is rotating we can calculate the centripetal acceleration
a = w² R
a = 2513.27² 0.633
a = 3.998 10⁶ m / s²
the linear and angular variable are related
a = α r
α = a / r
α = 3.998 10⁶ / 0.633
α = 6.31 10⁶ rad / s²
Difference between on pitch and frequency
Answer:
A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave. I hope I got it correct !!
The amount of heat an object can give off depends on _________.
its temperature and how big it is
its temperature
how big it is
none of the above
plssssssssssssss answer
Explanation:
it's temp and how big it is
Which property is not commonly used to identify minerals?
A)
luster
B)
texture
hardness
D)
crystal form
Answer:hardness
Explanation: I’m smart like dhet
Answer:
Luster
Explanation:
Hardness is very important for seperating rocks and minerals.
However, Luster is not as common, nor on many questions.
You have been accepted into a boat building competition. You get to pick between two boat plans. Boat A’s plans has the dimensions of 45m wide and 126m long and exerts 2300Pa of pressure. Boat B’s plans has the dimensions of 6m wide and 115m long and exerts 2700Pa of pressure. In order for the boat to float, the force applied to the water must not exceed 2.0 X 10 6 N. Would you pick Plan A or Plan B?
Answer:
the force B is less than the maximum force consequently Boat B floats
Explanation:
To solve this exercise let's use the pressure defined
P = [tex]\frac{F}{A}[/tex]
F = P A
let's start for boat A
let's search the area
A = l a
A₁ = 45 126
A₁ = 5670 m²
the force applied by this ship is
F₁ = 2300 5670
F₁ = 1.3 10⁷ N
now we do the calculation for ship B
A₂ = 6 115
A₂ = 690 m²
F₂ = P₂ A₂
F₂ = 2700 690
F₂ = 1.8 10⁶ N
indicate that the force should not be greater than F₀ = 2.0 10⁶ N, let's look for the relationship with each one
[tex]\frac{F_1}{F_0}[/tex] = 1.3 10⁷/2 10⁶
F₁ = 6.5 F₀
This force is greater than the one that can resist therefore the ship and sinks
[tex]\frac{F_2}{F_o}[/tex] = 1.8 /2
F₂ = 0.9 F₀
therefore this force is less than the maximum force consequently Boat B floats
Basketball is a target game. true or false
Answer:
true
Explanation:
because this is a favorite game i i think it us better
What is a fuel?
something that you rub to make heat
something that can be burned to produce heat
a kind of electricity
anything that makes heat
plssssss answer correctly
Answer:
something that can be burned to produce heat
Explanation:
Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
A fuel can be defined as something that can be burned to produce heat.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
g An electromagnetic wave is traveling on a transmission line. Its voltage is given by v(x, t) = 10 Exp[−γx] cos(15x − 109 t) where x is the distance (in meters) from the generator, and t is in seconds. (a) What is the frequency, wavelength and phase veolicty of the electromagnetic wave. (b) at x = 3 m, the wave amplitude is measured to be 4V . Determine γ
Answer:
a)
f = 1.59*10⁸ Hz.
λ = 0.42 m
vp = 0.67*10⁸ m/s = 0.22 c
b)
γ = 0.31 1/m
Explanation:
a)
In a transmission line, voltage varies sinusoidally with the distance and time.We can express mathematically this relationship in a cosine form as follows:V (x,t) = A cos (kx-ωt + φ₀) (1)where A = amplitude of the wave (Volts)k = number of wave = 2*π/λ (being λ the wavelength of the wave)ω = angular frequency = 2*π*f (being f the frequency of the wave)φ₀ = phase of the wave.In our case, the expression for the voltage is as follows:v (x,t) = 10 V Exp [-γx] cos (15x-10⁹ t) (2)From (1) and (2) we find the following equalities:k = 15 = 2*π/λ (3)Solving for λ:[tex]\lambda = \frac{2*\pi }{k} =\frac{2*\pi }{(15)1/m} = 0.42 m (4)[/tex]
ω = 2*π*f = 10⁹ rad/sec (5)Solving for f:[tex]f = \frac{\omega }{2*\pi } =\frac{10e9rad/sec }{(2*\pi rad} = 1.59*e8 (6)[/tex]
The phase velocity of the wave is just the product of the wavelength times the frequency, as follows:[tex]v_{phase} =\lambda * f = 0.42m * 1.59e8 1/sec = 0.67e8 m/s (7)[/tex]
b)
We can express the amplitude at any time as follows:[tex]V = 10 V *e^{-\gamma*x} (8)[/tex]
If we know that V= 4 V at x=3m, (8) becomes:[tex]10 V *e^{-\gamma*3m} = 4 V (9)[/tex]
Taking ln on both sides, we can solve for γ as follows:[tex]-\gamma*3m* ln e = -\gamma*3m = ln (\frac{4V}{10V}) = ln 0.4\\\gamma = -\frac{ln 0.4}{3m} = 0.31 (1/m) (10)[/tex]
γ = 0.31 1/m
The standing vertical jump is a good test of an athlete's strength and fitness. The athlete goes into a deep crouch, then extends theirlegs rapidly; when theirlegs are fully extended, theyleave the ground and rise to theirhighest height.It is the force of the ground on the athlete during the extension phase that accelerates the athlete to the final speed with which theyleave the ground.A good jumper can exert a force on the ground equal to twice theirweight. If thecrouch is 65 cm deep, how far off the ground do theyrise
Answer:
h = 1.3 m
Explanation:
For this exercise we can use the relationship between work and kinetic energy
W = Δx = K_f - K₀
in the exercise they indicate that the strength of the athlete is over twice his weight, therefore the ratio of the floor directed upwards has the same value
F = 2W
F = 2 mg
the displacement is x = 0.65 m, note that the direction of the force and the displacement is the same and the initial velocity is zero due to being crouched at rest, we substitute
F x = ½ m v² - 0
v² = 2 (2mg) x / m
v = [tex]\sqrt{4gx}[/tex]
let's calculate
v = [tex]\sqrt{ 4 \ 9.8 \ 0.65}[/tex]
v = 5.05 m / s
already in the air energy is conserved
starting point. Just when it comes off the ground
Em₀ = K = ½ m v²
final point. When is it at the highest part of the trajectory
Em_f = U = m g h
Em₀ = Em_f
½ m v² = m g h
h = ½ [tex]\frac{v^2}{g}[/tex]
let's calculate
h = ½ 5.05²/9.8
h = 1.3 m
how is the side of the construction paper with sunblock lotion different from the side without sunblock lotion
Answer:
The side of the paper with sunblock lotion stays on its the same color/tone while the other side of the paper without sunblock lotion faded
Explanation:
Ultraviolet (UV) radiation from the sun is the main cause of skin cancer, so one of the best ways to prevent skin cancer is to protect your skin from sun exposure with the use of sunscreen/sunblock. The sunlight that reaches us is made up of two types of harmful rays: long waves (UVA) and short waves (UVB)
Choose all true statements Choose all true statements Resistors connected in parallel will always have the same potential difference across all of them. When combining multiple resistors in series, the equivalent resistance is less than any of the individual resistanes. Resistors connected in series will always have the same current flowing through all of them. Resistors connected in series will always have the same potential difference across all of them. Resistors connected in parallel will always have the same current flowing through all of them. When combining multiple resistors in parallel, the equivalent resistance is less than any of the individual resistanes.
Answer:
The answer is " Option F, Option C, and Option D".
Explanation:
In the question the three choices were correct which can be defined as follows:
Its equivalent resistance is below any load resistors while integrating multiple resistors in parallel.The connected sequence resistances will still have the same fluid power.Simultaneously connected resistances will always have the same electrical potential between them at all.An object has a mass of 450g. What is the gravitational force of the object by earth?
Answer:
4.41N or 4.5N (check explanation)
Explanation:
450g = 0.45kg
F = ma
Using 10m/s² = 10(0.45) = 4.5N
Using 9.8m/s² = 9.8(0.45) = 4.41N
A sports car moving at constant speed travels 164 m in 13.77 s. If it then brakes and comes to a stop in 3.6 s. What is its acceleration in terms of "g's", where 1.00 g = 9.80 m/s2?
Answer:
a = - 0.3376 g's
Explanation:
The sports car has a constant speed when travelling. Covered 164 m in 13.77 s. Thus, speed = 164/13.77 m/s
It brakes and now comes to a stop in 3.6 s.
Thus final velocity = 0 m/s
Formula for acceleration is;
a = (v - u)/t
a = (0 - (164/13.77))/3.6
a = -3.308 m/s²
In terms of g's", where 1.00 g = 9.80 m/s², we have;
a = -3.308/9.8 g's
a = - 0.3376 g's
Learning Task 2:
Match the Richter magnitude indicated in column A with the
earthquake effect found in column B. Write your answer on the space provided.
NEED TONIGNT SANA MAY TUMULONG
Answer:
Hello your question has some missing parts attached below is the missing part
Answer :
Caused severe damage ( 7 ) ----- EFurniture moves ( 5 ) -------- GMay not be felt ( 2 ) ---------- FFelt by most people ( 4 ) --------- Dwidespread destruction ( 8 up ) ------ Blead to a lot of damage ( 6 ) -------- AFelt little by people ( 3 ) ---------- CExplanation:
Matching the Richter magnitude indicated in column A with the Earthquake effect found in column B
Caused severe damage ( 7 ) ----- EFurniture moves ( 5 ) -------- GMay not be felt ( 2 ) ---------- FFelt by most people ( 4 ) --------- Dwidespread destruction ( 8 up ) ------ Blead to a lot of damage ( 6 ) -------- AFelt little by people ( 3 ) ---------- CChoose the correct statement below about the interaction between magnets, magnetic materials and charges.
a) The south magnetic pole repels the north pole of another magnet.
b) The south magnetic pole attracts the north pole of another magnet.
c) A magnetic material that has not been made into a magnet is not attracted to either the north and south pole of a magnet.
d) The north magnet pole attracts the north magnetic pole of another magnet.
e) The south magnetic pole attracts the south magnetic pole of another magnet.
Answer: B. The south magnetic pole attracts the north pole of another magnet.
Explanation:
The correct statement below about the interaction between magnets, magnetic materials and charges is that the south magnetic pole attracts the north pole of another magnet.
We should note that a magnet typically consists of two poles which are the North Pole and the South pole. The opposite poles doesn't repel each other but attracts each other while same pole repels one another.
In this case, the North Pole will attract the South Pole while same magnetic piles repel e.g the North Pole will repel the North Pole.
A stack of books whose true weight is 165 N is placed on a scale in an elevator. The scale reads 165 N. From this information alone, can you tell whether the elevator is moving with a constant velocity of 2 m/s upward, is moving with a constant velocity of 2 m/s downward, or is at rest
Explanation:
Given
The true weight of books is [tex]165\ N[/tex]
Weight measured in the elevator is also [tex]165\ N[/tex]
True weight=measured weight
Therefore, we can say that elevator is not accelerating
Had the lift is accelerating upwards, the measured weight would be more than the true weight.
Thus, it cannot be said with certainity that the lift is moving upward, downward, or at rest.