Answer:
Yes, when the velocity of the object is negative.
Explanation:
In position and time graphs, the slope of line indicates the velocity. Therefore negative slope of a position-time graph actually indicates negative velocity. Negative velocity is defined as the velocity of the object moving in an opposite direction.
The time graph reveals pertinent information about an object's velocity. For example, a small slope means a small velocity; a negative slope means a negative velocity; a constant slope (straight line) means a constant velocity; a changing slope (curved line) means a changing velocity.
What is the force on a 1000 kg elevator that is free falling at 9.8 m/s/s?
Answer:
Explanation:
Force = (mass) · (acceleration)
= (1,000 kg) · (9.8 m/s²)
= 9,800 newtons
Write skeleton equations for the following reaction. Write the correct formula in each blank. You do not need to make the subscripts small. For example for carbon dioxide, write CO2
barium chloride ____ + potassium sulfate ____ → barium sulfate _____ + potassium chloride _____ sodium+iron(III) chloride→iron+sodium chloride
Please help me!!
1. BaCl2+K2SO4⇒BaSO4+KCl
2. Na+FeCl3⇒Fe+NaCl
Further explanationGiven
Word equation
Required
Skeleton equation
Solution
A chemical reaction can be expressed in terms of:
words equation the skeleton equation balanced equationThe skeleton equation is still in unbalanced form
So only chemical formulas of reactants and products and the relative amounts of the reactants and products are not included
For example :
• word equation
Ethane + Oxygen ⇒ Carbon dioxide + Water
• skeleton equation
C₂H₆ + O₂ ⇒ CO₂ + H₂O
• balanced equation
2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O
1.
word equation
barium chloride ____ + potassium sulfate ____ → barium sulfate _____ + potassium chloride _____
skeleton equation
BaCl2+K2SO4⇒BaSO4+KCl
2.
word equation
sodium+iron(III) chloride→iron+sodium chloride
skeleton equation
Na+FeCl3⇒Fe+NaCl
The table shows information about four objects resting at the top of a hill.
A 3-column table with 4 rows titled Four Objects at Rest on a Hill. The first column labeled Object has entries W, X, Y, Z. The second column labeled Mass (kilograms) has entries 50, 35, 62, 24. The third column labeled Potential Energy (Joules) has entries 980, 1029, 1519, 1176.
Which object is on the tallest hill?
W
X
Y
Z
It's Z your welcome :)
Answer:
It is Z i believe.
Explanation:
Potential Energy = mass x gravity x height
W: 980 = (50)(9.8)(h)
X: 1029 = (35)(9.8)(h)
Y: 1519 = (62)(9.8)(h)
Z: 1176 = (24)(9.8)(h)
simplify:
W: 980 = 490h
X: 1029 = 343h
Y: 1519 = 607.6h
Z: 1176 = 235.2h
Divide from both sides of each equation:
W: (980/490) = h
X: (1029/343) = h
Y: (1519/607.6) = h
Z: (1176/235.2) = h
Simplify the left side:
W: 2 = h
X: 3 = h
Y: 2.5 = h
Z: 5=h
which weather change usually occurs when the difference between the air temperature and the dewpoint temperature is decreasing
Answer:
relative humidity increases
Explanation:
hope this helps:)
1. Which of the following is an example of projectile motion?
An elevator
Ajet taking off
O A football flying through the air
Dropping an aluminum can into the garbage
Answer:
A football flying through the air
Explanation:
when an object has projectile motion it is moving through the air
From the given options, the football flying through the air is the prime example of projectile motion. (option d)
Projectile motion refers to the motion of an object that is launched into the air and moves under the influence of gravity alone. It follows a curved path known as a projectile trajectory. Among the options provided, the example that best represents projectile motion is a football flying through the air.
When a football is kicked or thrown, it experiences an initial force that propels it forward. However, as soon as it leaves the kicker's or thrower's hand or foot, the only force acting on it is gravity. Gravity pulls the football downward, causing it to follow a curved path. The shape of the path depends on the angle at which the football is launched and its initial velocity.
During its flight, the football follows a parabolic trajectory, moving both horizontally and vertically. The horizontal component of its motion remains constant, while the vertical component experiences a downward acceleration due to gravity. This combination of horizontal and vertical motion creates the characteristic curved path of projectile motion.
Therefore, option (d) is correct.
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Refresh the simulation, and then add six protons and six electrons to make a neutral carbon atom. the Mass Number window. What's the mass number of this carbon atom?
Answer:
The mass number of this carbon atom is 12.
Explanation:
Mass number = Number of protons + Number of neutrons = 6 + 6 = 12
Brainlist pls!
Answer:
6
Explanation:
How will you show that metals form basic oxides?
Answer:
when Metallic oxide reacts with water they form metallic hydroxide which are basic in nature
The most common elements in the Earth’s crust are rarely found on their own. They are usually found combined. Suggest why this is.
Answer:
Because there are other elements that get in touch with it. And over time with, evolution, erosion and temperature their particles tend to mix. So what once was very common became mixed over time.
The most common element throughout the Earth’s crust that are rarely found on their own will be "Astatine".
Astatine seems to be the very most uncommon or infrequent natural substance throughout Earth's crust that occurs just under 1 gram at any time.It's indeed exceedingly impossible to make Astatine-210, particularly in perhaps the most useful state, don't just in less and less astatine present in the fundamental natural world.
Thus the above answer is correct.
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A population is known to have a standard deviation of 26.1. A sample space of 35 items has a mean of 562. Construct a 90% confidence interval estimate of the name of the population.
Answer:
553.74≤x≤578.26
Explanation:
The formula for calculating the confidence interval is expressed as
CI = xbar±(z×s/√n)
xbar is the mean = 562
s is the standard deviation = 26.1
n is the sample size = 35
z is the z score at 90% CI = 1.645
Substitute the values into the formula
CI = xbar±(z×s/√n)
CI = 561±(1.645×26.1/√35)
CI = 561±(1.645×4.412)
CI = 561±7.257
CI = {561-7.257, 571+7.257}
CI = {553.74, 578.26}
Hence the 90% confidence interval estimate of the name of the population is 553.74≤x≤578.26
What is horizontal motion
Horizontal motion is defined as a projectile motion in a horizontal plane depending upon the force acting on it. For a short distance, the vertical and horizontal components of a projectile are perpendicular and independent of each other.
Answer:
A projectile moves along its path with a constant horizontal velocity
If red and blue light rays fall with the same angle of incidence on the separating
surface between two different transparent media, then the ratio between the refraction
angle of the red light and the refraction angle of the blue light (.) is
a) greater than 1
b)equal to 1
c )indeterminable
d)less than 1
Answer:
I'm gonna say it's D
Explanation:
but when u do the experiment on in u head you'll actually find out that it is actually , indeterminable
Cindy pours cool milk into a hot bowl of oatmeal and then stirs it with a room-temperature spoon. Which substance will have heat flow from it to the other substances?
the milk
the spoon
the oatmeal
the surrounding air
Answer:
The OatMeal
Explanation:
Answer:
C.) The Oatmeal
Since the oatmeal is the hottest it will spread the other substances which will increase the temperature of the milk, spoon, and the surrounding air.
The oatmeal had the most thermal energy out of the four options; the milk was cool, the spoon was at room temperature and the surrounding air was also at room temperature. Therefore, the heat from the oatmeal will travel to those substances and change their thermal energy.
Explanation:
Have a great rest of your day
#TheWizzer
calculate the magnitude of the net force on a 4.5 kg mass if the mass moves straight up at constant speed
Answer:
0
Explanation:
as Newton 1st Law said that every object will remain at rest or in uniform motion (constant speed) in a straight line unless compelled to change its state by the action of an external force
Net Force = 0
Chef Andy tosses an orange in the air, then catches it again at the same height. The orange is in the air for 0.75\,\text s0.75s0, point, 75, start text, s, end text. We can ignore air resistance.
What was the orange's velocity at the moment it was tossed into the air?
Answer:
90.82%digrash silsho
Free electromagnetic oscillations occur in an electrical circuit. Knowing the characteristic dimensions of the elements, L=20mH și C=0,005mF, determine: a)The period of free electromagnetic oscillations: b)Frequency of free electromagnetic oscillations: c)Electromagnetic energy in the circuit when the maximum value of the current intensity is equal to 100 mA.
Answer:
a. 0.199 ms b. 5.03 kHz c. 0.1 mJ
Explanation:
a. The period of oscillation of an L-C circuit is T = 2π√(LC) where L = inductance = 20 mH = 20 × 10⁻³ H and C = capacitance = 0.005 mF = 5 × 10⁻⁶ F.
So, T = 2π√(LC)
= 2π√(20 × 10⁻³ H × 5 × 10⁻⁶ F)
= 2π√(100 × 10⁻¹¹)
= 2π√(10 × 10⁻¹⁰)
= 2π(3.16 × 10⁻⁵)
= 19.87 × 10⁻⁵
= 1.987 × 10⁻⁴ s
= 1.99 × 10⁻⁴ s
= 0.199 × 10⁻³ s
= 0.199 ms
b. frequency , f = 1/T where T = period = 0.199 × 10⁻³ s.
So, f = 1/0.199 × 10⁻³ s
= 5.03 × 10³ Hz
= 5.03 kHz
c. The electromagnetic energy E = 1/2Li² where L = inductance = 20 × 10⁻³ H and i = current = 100 mA = 0.1 A
So, E = 1/2Li²
= 1/2 × 20 × 10⁻³ H × (0.1 A)²
= 0.1 × 10⁻³ J
= 0.1 mJ
All of the following are kinds of forces except thrust acceleration gravity friction
thrust
acceleration
gravity
friction
Answer:
Acceleration
Explanation:
The choice from the given option which is not a force is acceleration.
Acceleration is defined as the rate of change of velocity of a body with time;
Acceleration = [tex]\frac{change in velocity}{time}[/tex]
Force is a pull or push on a body. The product of mass and acceleration is force.
Thrust is a form of forceGravity is a force acting on bodies with masses. Friction is a force that opposes motion,When the mallet hits the ball with an action force, the ball exerts a reaction 1 force on the mallet as explained by: 1) Newton's first law 2) Newton's second law 3) Newton's third law 4) all three of Newton's laws
Answer:
It's Newton's third law. For every known reaction, there is a equal and opposite reaction.
Explanation:
The mallet which hits the ball with an action force, the ball exerts a reaction force on the mallet as explained by the Newton's third law. Thus, the correct option is 3.
What is the Newton's third law?Newton's third law states that for every action (force) in nature there is an equal and opposite force or reaction. An example of third law of motion is that the mallet hits the ball with an action force, then the ball exerts a reaction.
If an object A exerts a force on the object B, then object B must also exert a force of equal magnitude and in the opposite direction back on object A. The law represents a certain symmetry in the nature that the forces always occur in pairs, and one body cannot exert a force on another without experiencing any kind of force itself.
Therefore, the correct option is 3.
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A cart is moving at 55 m/s at an angle of 25° to the ground. Determine the horizontal component.
Answer:
The horizontal component of the velocity is 49.85 m/s.
Explanation:
Rectangular Components of a Vector
A 2D vector can be expressed in several forms. The rectangular form gives its two components, one for each axis (x,y). The polar form gives the components as the pair (r,θ) being r the magnitude and θ the angle.
When the magnitude and angle of the vector are given, the rectangular components are calculated as follows:
[tex]v_x=v\cos\theta[/tex]
[tex]v_y=v\sin\theta[/tex]
Where v is the magnitude of the vector and θ is the angle with respect to the x positive direction.
The cart is moving at v=55 m/s at θ=25°, thus:
[tex]v_x=55\cos 25^\circ[/tex]
[tex]v_x=49.85\ m/s[/tex]
The horizontal component of the velocity is 49.85 m/s.
The diagram shows a state of matter in a closed system before and after undergoing a
change.
System before change
System after change
SEE
Which statement best explains the change in the system?
Particle motion decreases when thermal energy is added to the system
O Particle motion increases when solid particles are added to the system.
O Particle motion increases when thermal energy is added to the system.
O Particle motion decreases when gas particles are added to the system.
Answer:
the second one
Explanation:
Particle motion increases when solid particles are added to the system.
A repeating disturbance that transfers energy through matter or space is called a _____.
Answer:
Collateral Damage
Explanation:
Answer:
The answer is Wave
Explanation:
Explain what happens as an object moves through each phase of matter.
ASAP PLEASE ????????
Explanation:
gas vibrate and move freely at high speeds, liquid vibrate, move about and slide past each other. solid vibrate (jiggle) but generally do not move from place to place
A carbon fiber car bumper is hit by another car with the stress of 106,483 Pa. If carbon fiber has a Young's modulus of 228 x 109 Pa, what is the amount of strain it will experience?
Answer:
Stress = 4.67 * 10^-7 N/m²
Explanation:
Young's modulus of the material = Stress/Strain
Given
Young's modulus = 228 x 10^9 Pa
Stress = 106,483 Pa
Required
Strain
From the formula;
Strain = Stress/Young modulus
Strain = 106,483 /228 x 10^9
Stress = 4.67 * 10^-7 N/m²
A swing held up by someone at one side has the potential to swing when released.
True
False
if a truck has the mass of 2,000 kilometres and a velocity of 35 m/s, what is the momentum
Answer:
70,000 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 2000 × 35
We have the final answer as
70,000 kg.m/sHope this helps you
Which type of matter is gold an element used in making jewelry A.) A heterogeneous mixture B.) A pure substance C.) A crystalline compound D.) A homogeneous mixture
Answer:
A
Explanation:
The gold used in the making of jewelry is usually not pure but a heterogeneous mixture of metals. Pure gold is quite soft and even though it may look better in appearance compared to those made using heterogeneous mixtures, it usually bends easily. Hence, in order to make the jewelry more durable, gold is usually mixed with other metals to form a heterogeneous mixture.
The correct option is A.
If you could change one rule in soccer, what would it be and why?
is
A 0.155 kg arrow is shot upward
at 31.4 m/s. What is its kinetic
energy (KE) when it is 30.0 m
above the ground?
Kinetic energy = 29.912 J
Further explanationGiven
mass = 0.155 kg
vo=initial velocity = 31.4 m/s
h/d=30 m
Required
KE=kinetic energy
Solution
vt²=vo²-2ad⇒vt=final velocity
vt²=31.4²-2.10.30⇒g=10 m/s²
vt²=985.96-600
vt²=385.96 m/s
Kinetic energy (KE)
[tex]\tt KE=\dfrac{1}{2}mv^2\\\\KE=\dfrac{1}{2}\times 0.155.\times 385.96\\\\KE=29.912~J[/tex]
Answer:
The answer is 30.8 (J)
Explanation:
You're welcome
I'll give brainliest....
. a train starts from rest and moves with a uniform acceleration of x metre per second square for 5 minutes determine the value of x if it covers a distance of 5.8 km during the journey
Answer:
x = ~0.1289 m/s^2
Explanation:
We can use one of the kinematic formulas. We see that the equation doesn’t contain the final velocity, so we use the kinematic equation d = v_0t + (1/2)at^2.
Since the train started from rest, the initial velocity, v_0, is 0. Thus, the equation becomes:
d = (1/2)at^2
Note that 5 minutes is 300 seconds and 5.8 km is 5800 m. Substituting the values we are given, we get:
5800 m = (1/2)(x m/s^2)(300 s)^2 = (45000 s^2)(x m/s^2)
Dividing by 45,000 on both sides, we get:
x = ~0.1289 m/s^2
I hope this helps! :)
just want a ride with
Answer:
My best friend lol cuz since quarantine i didn't see her
HELPP WILL MARK BRAINLIEST!!!
Answer: the answer is c