Answer:
67.8 degrees below horizontal
Explanation:
In order to understand the direction of the ball after a certain time t, we need to find its horizontal and vertical components of the velocity.
- Horizontal component: the horizontal component of the velocity of the ball is constant, since there are no forces acting along this direction. Therefore, its horizontal velocity after t = 2 s is
vx = 8 m/s
- Vertical component: the vertical component of the velocity of the ball is given by
vy = u + at
where
u = 0 is the initial vertical velocity
a = g = -9.8 m/s^2 is the acceleration of gravity
Substituting t = 2s,
vy = 0 + (-9.8 m/s^2)(2s )=-19.6 m/s
where the negative sign indicates it points downward.
So, the direction of the ball (given as angle below the horizontal) is:
[tex]\theta = tan^{-1} (\frac{|v_y|}{v_x})=tan^{-1} (\frac{19.6 m/s}{8 m/s})=67.8^{\circ}[/tex]
The ball is moving in a downward arc but still maintains its original horizontal speed of 8m/s. Two forces are acting on the ball: the initial horizontal velocity and the force of gravity pulling it downwards. These two forces act independently of each other in an ideal scenario with no air resistance.
Explanation:The ball, thrown horizontally from a cliff at 8m/s, will still be moving in a horizontal direction 2 seconds later. There are two forces acting on the ball once it's thrown: the initial horizontal velocity given to it (in this instance, 8m/s), and the force of gravity pulling it downwards. In an ideal scenario with no air resistance, these two forces act independently of each other.
Therefore, the horizontal component of the velocity remains constant, while the vertical component increases over time due to the Earth's gravity. It's important to note that while the direction of the ball's velocity is changing (since it's arcing downwards), the horizontal component of that velocity remains constant at 8m/s. The ball is moving in a downward arc but still maintains that original horizontal speed.
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What type of bond is most likely to form between two gold atoms.Ametalic bond. B non polar covalent bond. C polar covalent bond. D ionic bond
the answer is A
metallic bonds are formed between metal ions
What type of circuit is illustrated?
A.closed parallel circuit
B.Closed series circuit
C.open series circuit
D.Open parallel circuit
Answer:
I beleive its B
Explanation:
If not then A but I'm positive its B
If a single-load Series circuit has one 20 Ohm bulb, and a
second, identical, 20 Ohm bulb is added in parallel with
the first, what will be the effect on the brightness of the
bulbs?
At the instant the second bulb is connected ...
... the brightness of the first bulb doesn't change
... the brightness of the second bulb changes from dark (no brightness) to equal to the first bulb
When the second 20 Ohm bulb is added in parallel, the bulbs becomes brighter
How to describe the effectAdding a second, identical 20 Ohm bulb in parallel with the first one will have the effect of increasing the brightness of the bulbs.
In a series circuit, the total resistance increases as more resistors are added, which reduces the current flowing through the circuit. As a result, the bulbs would be dimmer in a series circuit.
However, when the second 20 Ohm bulb is added in parallel, the total resistance decreases, allowing more current to flow through the circuit. This increased current results in a higher brightness of the bulbs.
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QUESTION 1
What is amperage?
is the rate of doing work.
is the rate of flow of protons in electric current.
represents the amount of pressure behind electron flow.
is the rate of flow of electrons in electric current.
2 points
QUESTION 2
What is Voltage?
is the rate of doing power.
represents the amount of pressure behind electron flow.
is the rate of doing work.
is the rate of flow of electrons in electric current.
2 points
QUESTION 3
What is Power?
is the rate of flow of protons in electric current.
is the rate of flow of electrons in electric current.
is the rate of doing work.
represents the amount of pressure behind electron flow.
2 points
QUESTION 4
If we multiply volts times amps we get what?
power
circuit
work
current
2 points
QUESTION 5
What are two ways alternating currents are similiar?
In both AC and DC electrons flow in the same pattern.
In both AC and DC, the flow of electrons changes directions back and forth.
Both AC and DC are only possible in certain materials with atoms that will allow electron flow.
Both AC and DC involve the flow of electrons.
4 points
QUESTION 6
How does the flow of electrons flow in an alternating current?
The flow of electrons is always slower in an alternating current than within a direct current.
The flow of electrons is not constant and forward; it changes direction back and forth.
Electrons flow from from a higher affinity to that of a lower affinity.
Electron flow is constant and only in a forward direction.
2 points
QUESTION 7
What is the flow like in a direct current?
The flow of electrons is not constant and forward; it changes direction back and forth.
The flow of electrons is constant and only in a forward direction.
The flow of electrons go from a higher affinity to a lower affinity.
The flow of electrons are always faster in a direct current.
2 points
QUESTION 8
How is an electric current able to flow?
Electrons flow from the higher affinity to lower affinity and electrical current is generated.
Protons flow from the higher affinity to lower affinity and electrical current is generated.
The movement of protons from one atom to another leads to an electric charge.
The movement of electrons from one atom to another atom in a line results in a flow of electric current.
2 points
QUESTION 9
How do electrons move from the two different types of metal in a battery?
Protons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated.
Electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated.
Electrons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.
Protons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.
Answer:
Question 1 : is the rate of flow of electrons in electric current.
Question 2: represents the amount of pressure behind electron flow
Question 3: is the rate of doing work
Question 4: Power
Question 5: Both AC and DC are only possible in certain materials with atoms that will allow electron flow.
Both AC and DC involve the flow of electrons.
Question 6: The flow of electrons is not constant and forward; it changes direction back and forth.
Question 7: The flow of electrons is constant and only in a forward direction.
Question 8: The movement of electrons from one atom to another atom in a line results in a flow of electric current.
Question 9: Electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated.
The purpose of carbohydrate loading is to
A. make protein stores available for energy.
B. deplete glycogen stores.
C. maximize glycogen stores.
Stress hormones tend to increase the metabolic needs of the body because they
A. increase the use of insulin.
B. "can accelerate heart rate, increase muscle tension, elevate blood pressure, cholesterol, and triglyceride levels."
C. reduce the amount of glycogen stored in the muscles.
Which energy system has a short-lived supply of fuel and is released in high-intensity events?
A. The ATP-CP system
B. The aerobic system
C. The sprint pathway
Answer:
Carbohydrate loading, commonly referred to as carb-loading or carbo-loading, is a strategy used by endurance athletes, such as runners, to maximise the storage of glycogen (or energy) in the muscles and liver. C. maximize glycogen stores.
Explanation:
Answer:
C. maximize glycogen stores.
Explanation:
Which is NOT true about oxygen-17 and oxygen-18?
Answer:
Their atoms have identical mass.
Explanation:
Oxygen-17 and Oxygen-18 are both isotopes of Oxygen.
Oxygen has three isotopes, Oxygen- 16, Oxygen-17 and Oxygen-18.
Oxygen- 16 has 8 protons and 8 neutrons and a mass number of 16.
Oxygen-17 has 8 protons and 9 neutrons and a mass number of 17.
Oxygen-18 has 8 protons and 10 protons and a mass number of 18.
The three isotopes therefore have the same atomic number ( the number of protons) but different mass numbers.
Which data set has the smallest standard deviation?
A. 1,6,19,20,85,29,0
B. 22,22,23,23,22,22,23
C. 6, 7, 6, 7, 1004, 980, 350
D. 99, 199, 299, 55, 44,33, 22
Answer:
B. 22,22,23,23,22,22,23
Explanation:
The standard deviation is a measure of dispersion or variability of a data set. In order to determine the data set that has the smallest standard deviation, we shall investigate on the ranges of the data sets given. The range of a data set is simply the difference between the maximum and minimum values in a data set. A data set that has a smaller range also has a smaller standard deviation.
From the alternatives given, the data set given by alternative B has the smallest range and consequently the smallest standard deviation.
The maximum value is 23 while the minimum is 22. The range is 1.
what are newtons laws?
Explanation:
Newton's 1st law: An object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force.
Newton's 2nd law: Force equals mass times acceleration.
Newton's 3rd law: For every action, there is an opposite and equal reaction.
A student wears sunglasses to help her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses?
a polarization
b.refraction
c.diffraction
d. interference
Refraction is the bending of light as it passes from one medium to another, causing objects to appear shifted or distorted when viewed through lenses.
The wave interaction that occurs as light passes from the air into the plastic lenses of the sunglasses is refraction. Refraction is the bending of light as it passes from one medium to another due to the change in its speed. This bending of light is what makes objects appear shifted or distorted when viewed through lenses.
If an electric circuit is not grounded it is best to reach out and touch it to provide the ground A.True or B.False
there are more and more jobs in cybersecurity because
Answer:
it is a nation wide crisis
Explanation:
Answer:
The internet is always growing
Explanation:
An input force of 7 N is applied to a machine with a mechanical advantage of 1.75. What is the maximum the machine could lift?
12.25 N
7N
7.25 N
26.2 N
[tex]F_{max}=7N\cdot1.75=\boxed{12.25N}[/tex]
Hope this helps.
r3t40
Most of the eastern United States is a _____ biome
Answer:
Most of the eastern United States is a TROPICAL RAINFOREST bione
The sun is the driving force behind each of these kinds of energy except.........
a. solar energyb. nuclear energyc. hydroelectric energyd. wind energy
The sun is the original source of solar energy, hydroelectric energy, food energy, coal energy, oil energy, and wind energy.
The sun is NOT the original source of nuclear energy. (b)
Answer:
The answer is b. nuclear energy
Explanation:
Nuclear energy is a process through which electrical energy is generated by the disintegration of atoms from a material called uranium. The energy that uranium releases when its atoms disintegrate produces heat with which the water found in nuclear reactors is boiled to produce electricity.
Which best describes what is required for any sound wave to travel?
empty space
O any medium
solid
liquid
Plllzzzhelp
Answer:
Any medium solid, liquid or gas is required for sound waves to travel.
Explanation:
A sound wave requires a medium to travel. Sound waves are mechanical waves that is why these waves require a medium to travel. Sound waves can travel through solids, liquids, and gases.
In solids, the particles of the medium are closely packed together as compared to liquids and gases. In liquids, particles are less tightly packed and almost negligible in gases.
Therefore sound waves produce vibration in the dense or solid medium. Denser the medium faster the sound waves travel. However sound waves can not travel through empty space.
Answer:
the answer is B just took the test!!
Explanation:
What about a rubber band, can it change its shape? Is it a solid?
Answer:
Yes it is a solid
Explanation:
It just has unusual properties.
Does it float when you drop it? then it is not a gas.
Does it pour into any container as water does? Then it is not a liquid.
So it's a solid.
And it can change it's shape
Answer:
Yes, it is.
Explanation: Rubber band is ab elastic material which when stretched changes it's original shape.
A measurement standard is defined as ____.
Answer:
A measurement standard is defined as 'the exact quantity people agree to use for comparison'.
Explanation:
For the same type of quantity, there is a unit of measurement which is defined and adopted either conventionally or by law which is used as standard for measurement of that quantity.
This measurement standard is defined as 'the exact quantity people agree to use for comparison'.
For example, for length the standard unit of measurement is 'meter'.
Answer:
is an object system or experiment that bears a defined relationship to a unit of measurement of a physical quality
Which of Hubble’s discovery support the Big Bang theory
Answer:
there are no mutiple choices
Answer:
Redshift increases with distance
Explanation:
Edwin Hubble discovered a relation for distance and radial velocities of galactic nebulae from their redshifts i.e., when an object is moving away from earth the wavelength of light gets changed due to the Doppler effect.
He also found that two galaxies when further apart have a greater speed by which they are moving away from each other. This was used to prove the Big Bang theory laid down by Georges Lemaître.
What type of reaction occurs when an egg cooks in a pan?
Answer:
exothermic
Explanation:
energy is absorbed by the surroundings
Answer:
endothermic, because energy is absorbed from the surroundings
Explanation:
The___is the time it takes for a wave to complete one cycle.
Answer:
Period
Explanation:
we know that
The period of a wave is the time required for one complete cycle of the wave to pass by a point.
Period is the time which is taken by a wave to complete one complete cycle.
Explanation:
The period can also be referred as the time period or the wave period. The period is relevant to the concept of wave and its propagation, which leads to the measurement of its travel, leading to establish the relation between the period and the frequency.
The S. I. unit for the period is seconds. The period is in inverse relationship of proportionality with the frequency, which is the number of cycles completed in a second.
A motor with an operating resistance of 2.21 ohms is connected to a voltage source. The current in the circuit is 3.8 A and the power of the system is 32 watts. What is the voltage of the source?
The answer is:
The voltage of the source is 8.40 Volts.
Why?To solve the problem, we need to use the Ohm's Law equation, which states that:
[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]
From the statement we know that:
[tex]Resistance=2.21\Omega\\Power=32W\\Current=3.8A[/tex]
Now, substituting and calculating we have:
[tex]Voltage(Volts)=Current(Amps)*Resistance(Ohm)[/tex]
[tex]Voltage(Volts)=3.8A*2.21\Omega=8.40V[/tex]
Hence, we have that the voltage of the source is 8.40 Volts.
Have a nice day!
which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules?
a. Q
b.W
c.V
d.U
Answer:
U
Explanation:
The first law of thermodynamics states that:
[tex]\Delta U = Q-W[/tex]
where
U is the internal energy of the gas, which represents the sum of the chemical and thermal energy stored in the atoms and molecules of the gas
[tex]\Delta U[/tex] represents the variation of internal energy
Q is the heat absorbed by the system
W is the work done by the system
So, the sum of the chemical and thermal energy stored in atoms and molecules is represented by U, the internal energy.
Answer:
U APEX
Explanation:
Which of the following equations is not balanced?
N2 + 3H2 → 2NH3
A. N2 + 3H2 → 2NH3
B. MgI2 + Br2 → MgBr2 + I2
C. KClO3 → KCl + O2
D.HCl + NaOH → NaCl + H2O
Answer: C) KClO3 → KCl + O2
Explanation:
the equation has an unequal amount of oxygen.
you can confirm because all the other equations are balanced so the answer is c
Answer:
[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]
(C) is correct option
Explanation:
Balanced equation :
In balanced equation, The number of atoms of each element in product side equal to the number of atoms of each element in reactant side.
The equation is not balanced in option C.
[tex]KClO_{3}\rightarrow KCl+O_{2}[/tex]
In this equation, The number of oxygen element in product side is not equal to the number of oxygen element in reactant side.
All equations are balanced.
What object has no momentum?
- a bird flying north
- a car parked in a garage
- a satellite orbiting Earth
-a truck with constant speed
Answer:
a car parked in a garage
Explanation:
where would a parked car go ? its not even in motion lol
The chart shows Daniela’s run through her race.
What is her velocity?
1.5 m/s
2 m/s
2.5 m/s
5 m/s
Answer:
Its 2.5
Explanation:
She moves at 5 m per 2 seconds so she moves at 2.5 m per second
The provided data is insufficient to calculate Daniela's velocity. This is because velocity not only considers the speed but also the direction. Therefore, information on Daniela's direction during the race is necessary for an accurate calculation.
Explanation:Unfortunately, the question does not provide sufficient information to calculate Daniela's velocity. Velocity is a measure that describes how much distance an object covers in a particular direction in a given amount of time. To calculate this, we must know not just the speed (distance/time) but also the direction of travel. Without the necessary data regarding Daniela's direction of movement during her race, we cannot provide a precise velocity value.
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What is the name of the aluminum ion?
Answer:
Aluminum ion is [tex]Al^{3+}[/tex]
Explanation:
Ions are formed due to the gain or loss of one or more electrons. There are two types of electric charges.
1. Positive charge
2. Negative charge
If an atom contains number of positive charges greater than the negative charges, its becomes positively charged. Also, if an atom contains number of negative charges greater than the positive charges, its becomes negatively charged.
We need to write the name of aluminium ion. The atomic number of Aluminium is 13. Its electronic configuration is, [tex]1s^22s^22p^63s^23p^1[/tex].
So, Aluminum ion is [tex]Al^{3+}[/tex]. Hence, this is the required solution.
The name of the aluminum ion is "aluminum ion" with a 3+ charge.
In chemistry, when an atom of aluminum loses three electrons, it becomes a positively charged ion known as the aluminum ion. Aluminum, as an element, is represented by the symbol Al and has an atomic number of 13, meaning it has 13 protons and 13 electrons in its neutral state.
When aluminum loses three electrons, it forms an aluminum ion with a 3+ charge. This happens because the number of protons (positive charges) remains the same, while the number of electrons (negative charges) decreases. The resulting positive charge on the ion signifies its ability to participate in various chemical reactions.
Aluminum ions play a crucial role in many industrial processes, particularly in the production of aluminum metal from its ore, bauxite. Additionally, they are essential in various chemical applications, including the manufacturing of aluminum-based products, catalysts, and electronics.
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what do scalars measure
force
acceleration
magnitude
velocity
magnitude.
scalars are units that has magnitude only
vectors have both magnitude and direction
Answer:
The answer is C, the magnitude.
Explanation:
Because force, acceleration and speed are all vector quantities. That is, to represent them not only reaches a number, but it takes an address, meaning, etc.
Instead a scalar magnitude (for example: temperature, mass) requiere for representation of a single value.
A force of 8,480 N is applied to a chart to accelerate it at a rate of 26.5 m/s2. What is the mass of the cart?
For this case we have that by definition, Newton's Second Law states that:
[tex]F = m * a[/tex]
Where:
F: It's the strength
m: It's the mass
a: It's the acceleration
According to the data we have to:
[tex]F = 8,480N\\a = 26.5 \frac {m} {s ^ 2}[/tex]
If we clear the mass of the formula we have:
[tex]m = \frac {F} {a}\\m = \frac {8,480} {26.5} = 320kg[/tex]
Answer:
The mass of the chart is 320kg
john throws .4 kg ball with velocity of 18 m/s. Hits .2 kg bottle and bottle flies 25 m/s. How fast is ball traveling after hitting the bottle?
Answer:
5.5 m/s
Explanation:
Assuming the bottle is initially stationary, we can write the law of conservation of momentum as follows:
[tex]p_i = p_f\\m_b u_b = m_b v_b + m_B v_B[/tex]
where
[tex]m_b = 0.4 kg[/tex] is the mass of the ball
[tex]u_b = 18 m/s[/tex] is the initial velocity of the ball
[tex]m_B = 0.2 kg[/tex] is the mass of the bottle
[tex]v_B = 25 m/s[/tex] is the final velocity of the bottle
[tex]v_b[/tex] is the final velocity of the ball
Solving for [tex]v_b[/tex],
[tex]v_b = \frac{m_b u_b - m_B v_B}{m_b}=\frac{(0.4 kg)(18 m/s)-(0.2 kg)(25 m/s)}{0.4 kg}=5.5 m/s[/tex]
5/6 - 1/3 sorry for add part i was meant to do minus but tell me what it is?
Answer:
[tex]\frac{1}{2}[/tex]
Explanation:
[tex]\frac{5}{6} -\frac{1}{3} = \frac{15}{18} -\frac{6}{18}=\frac{9}{18} =\frac{1}{2}[/tex]
Answer:
1/2
Explanation:
we will take the LCM of denominators with is LCM (6,3)=6.
Now we shall make denominators equal no both sides. Since 5/6 already has 6 as denominator we shall multiply 2 with 3 to make denominators equal in 1/3 and so we also multiply 1 with 2. we get
1/3 × 1/2= 1/6 ×2/1=2/6
now 5/6-2/6=3/6=1/2