Answer:
it should be true
Explanation:
:) hope it's right
How many moon diameters could you fit between
Earth and the moon?
if the student then moves backwards and returns to a position marked 20 meters another 7 seconds later, what is the displacement of the student from starting position?
The student returned to starting point hence the displacement is zero.
What is the displacement?The displacement refers to the distance that is covered in a specified direction. The difference between distance and displacement is that displacement is a vector quantity while distance is a scalar quantity.
If displacement is a vector quantity, it then follows that the direction must be taken into consideration when we are talking about the displacement of the body.
Looking at the fact that the student moves backwards and returns to a position marked 20 meters another 7 seconds later, it then follows that the student returned to starting point and that the displacement is zero.
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the current world-record motorcycle jump is 77.0 m, set by jason renie. assume that he left the take-off ramp at 120° to the horizontal and that the take-off and landing heights are the same. neglecting air drag, determine his take-off speed.
The speed of his take off is 43.2 m/s if he left the take-off ramp at 120° to the horizontal and that the take-off and landing heights are the same. neglecting air drag.
What is velocity?Velocity is the directional speed of a moving item as an indication of its rate of change in position as seen from a specific frame of reference and measured by a specific time standard (e.g., 60 km/h northbound). The idea of velocity is crucial in kinematics, the part of classical mechanics that explains the motion of bodies.
A physical vector quantity called velocity requires both magnitude and direction to be defined. Speed is a coherent derived unit that expresses the scalar absolute value (magnitude) of velocity. Its quantity is expressed in SI (metric system) units of metres per second (m/s or ms1). For example, "5 meters per second" is a scalar while "5 meters per second east" is a vector.
We have given that
R = 77.0m
[tex]\theta_0[/tex] = 12.0°
The horizontal range of such projectile R is given from the relation :
[tex]R = \frac{v^2_0}{g} sin 2 \theta_0[/tex]
Here, [tex]v_0[/tex] is velocity of take-off & [tex]\theta_0[/tex] is the angle of take-off
With this in mind,
[tex]v_0[/tex] = [tex]\sqrt{\frac{gR}{sin2\theta_0}[/tex]
= [tex]\sqrt{\frac{(9.8 m/s^2)(77m)}{sin24}[/tex]
= 43.2 m/s
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Consider a balloon of mass 0.030kg being inflated with a gas of density 0.54kg/m. What will be the volume of the balloon when it just begins to rise in the air of density 1.29kg/m3. (g=10m/s2) Detailed Explanation Please
the weight of the balloon is .030 * 10 = 0.3 N
the weight of the gas of volume v is 0.54*10 N
The lifting force of a volume of v m³ of displaced air is 1.29v N
so, we need
1.29*10*v = 0.3 + 0.54*10*v
or
1.29v = 0.03+0.54v
The volume of the balloon will be 0.056 m³ when it just begins to rise in the air.
What is volume?
A measurement of three-dimensional space is volume. Numerous imperial or US customary units, as well as SI-derived units (such the cubic metre and litre), are frequently used to quantify it numerically (such as the gallon, quart, cubic inch).
The definition of length (cubed) and volume are connected. The volume of a container is typically thought of as its capacity, or the amount of fluid (gas or liquid) that it could hold, as opposed to the amount of space the container occupies.
Mass of the balloon is = 0.030 kg.
Density of the gas inside the balloon is = 0.54 kg/m³
density of air outside the balloon is 1.29 kg/m³
Hence, volume of the balloon is = mass of the balloon ÷ density of the gas
= 0.030 kg ÷ 0.54 kg/m³
= 0.056 m³
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I need help on this question asap
Answer:
A-to determine how tempreture affects bounce height.
What is the efficiency of a worm gear reducer if input torque is 6532 inch-pounds and output torque is 5623 inch-pounds?
Th efficiency of the worm gear reducer if input torque is 6532 inch-pounds would be 86%.
What is Worm gearWorm gears are a common power-transmission component used to reverse the direction of a rotating shaft's motion as well as to reduce speed and increase torque between non-parallel rotating shafts.
They are used on shafts with axes that are perpendicular and do not intersect.
What is a worm gear reducer’s efficiency?Worm gears typically have a ratio range of 5:1 to 60:1.
How effective is a single worm set?
The efficiency of a single worm set varies with ratio and speed; this efficiency can vary from 40 to 93%.
Calculationn = Output/input x 100
= 5623/6532 x 100
= 0.86 x 100
= 86%
Thus, the efficiency is calculated as 86%
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a horizontal 52-N force is needed to slide a 50 kg box across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?
The coefficient of kinetic friction between the box and the floor is 0.11.
What is coefficient of friction?Coefficient of friction is a measure of the amount of friction existing between two surfaces.
The coefficient of kinetic friction between the box and the floor is calculated as follows;
F - Ff = ma
where;
a is the acceleration of the boxm is mass of the boxFf is frictional forceF is applied forceF - μmg = ma
at a constant velocity, acceleration, a = 0
F - μmg = 0
F = μmg
μ = F/mg
μ = (52) / (50 x 9.8)
μ = 0.11
Thus, the coefficient of kinetic friction between the box and the floor is 0.11.
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PLEASE HELP. 100 points!
The earliest light in the universe was orange. Describe how that light turned into the background microwave radiation we observe today.
if a gannet hits the water at , what height did it dive from? assume that the gannet was motionless before starting its dive.if a gannet hits the water at , what height did it dive from? assume that the gannet was motionless before starting its dive.
52.24 meters is the appropriate height to dive from.
How to calculate the height?Speed = v
Gravitational acceleration = g
v = 32m/s
h = v2/2g
= 32/ 2 * 9.8
= 52.24 m
Therefore, the height the gannet must dive from is 52.24 meters.
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A softball player throws a pitch. during the throw, the speed of the softball increases from 0 m/s to 40 m/s in 0.08 seconds. the average acceleration of the ball is...
A softball player throws a pitch. during the throw, the speed of the softball increases from 0 m/s to 40 m/s in 0.08 seconds. The average acceleration of the ball is 500m/s^2
As we know that average acceleration is :
a= Δv/Δt
given:
v1=0 m/s
v2=40m/s
t=0.08 s
put the values in the formula
a= 40 - 0/0.08
a=500m/s^2
Thus the average acceleration is 500 m/s^2.
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By using uniform motion, the average acceleration is 500 m/s².
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
vt = 40 m/s
vo = 0 m/s
t = 0.08 s
By substituting the given parameters, we can calculate the acceleration
vt = vo + a . t
40 = 0 + a . 0.08
a = 40/0.08
a = 500 m/s²
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A car, with an initial position of x=83.2 meters, undergoes a displacement of -153.0 meters. What is its final position? (Unit=m)
The final position of the car with an initial position of x = 83.2 m which undergoes a displacement of - 153 m is
We know that,
s = [tex]x_{2}[/tex] - [tex]x_{1}[/tex]
where,
s = Displacement
[tex]x_{2}[/tex] = Final position
[tex]x_{1}[/tex] = Initial position
Given that,
[tex]x_{1}[/tex] = 83.2 m
s = - 153 m
[tex]x_{2}[/tex] = -153 + 83.2
[tex]x_{2}[/tex] = - 69.8 m
Displacement is the the distance between initial and final positions of the object. It is denoted by s.
Therefore, the final position of the car is - 69.8 m
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a piston-cylinder apparatus has a 4 kg piston with a diameter of 5 cm resting on a body of water 60 cm high. atmospheric pressure is 101 kpa, and the temperature of the water is 250˚c. what is the mass of water in the container?
The mass of the water in the container is 10,104.00 kg.
A schematic diagram of a piston-cylinder apparatus is shown in the adjoining image.
In the above case, the atmospheric pressure applied by the piston and the weight of the piston should balance the weight of the water inside the container
Hence,
Atmospheric Pressure x Area of Piston + Mass of piston x g = Mass of water x g
101 x 10^3 x pi x (2.5 x 10^-2)^2 + 4 x 10 = Mass of water x 10
Mass of water x 10 = 101,040.001
Mass of Water = 101,040.001/10
Mass of Water = 10,104 kg
Hence, the mass of the water in the container is 10,104.00 kg.
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Which list of elements will behave similarly in a chemical reaction?
lithium (Li), boron (B), oxygen (O)
lithium (Li), sodium (Na) potassium (K)
sodium (Na), magnesium Mg), lithium (Li)
potassium (K), bromine (Br), krypton (Kr)
Answer:
I got you. its lithium (Li), sodium (Na) potassium (K)
Explanation:
They are all in the same group of the periodic table just look it up and look at group 1
a soccer player takes a free kick from a spot that is 29 m from the goal. the ball leaves his foot at an angle of 41 ∘, and it eventually hits the crossbar of the goal, which is 2.4 m from the ground.
The speed of the ball when it left his foot is 11.13 m/s.
The given parameters;
distance of the goal, d = 17 m
angle of projection of the ball, = 38°
height of the cross bar, H = 2.4 m
The speed of the projectile will be calculated by applying the formula for maximum height reached by a projectile;
u=2x9.8x2.4/sin2(38)
u=11.13
Thus, the speed of the ball when it left his foot is 11.13 m/s.
What is projectile?
An object that is driven by the application of an external force and then moves freely while being affected by gravity and air resistance is referred to as a projectile. Despite the fact that all items traveling through space are projectiles, they are frequently used in sports and warfare.
Therefore,
a soccer player takes a free kick from a spot that is 29 m from the goal. the ball leaves his foot at an angle of 41 ∘, and it eventually hits the crossbar of the goal, which is 2.4 m from the ground.
u=2x9.8x2.4/sin2(38)
u=11.13
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How does the frame of reference affect how an observer perceives motion?
A reference frame is a perspective from which you observe and measure things. Used to define the movement and position of objects. Two people can have different frames of reference for the same situation. In this case, they observe the movement and position of objects differently.
A reference frame is a perspective from which you observe and measure things. Used to define the movement and position of objects.
Two people can have different frames of reference for the same situation. In this case, they observe the movement and position of objects differently.
Units are a way of expressing measurements. It can consistently describe object velocity, mass, position, etc.
Scientists need to communicate their data clearly. They do this by sharing the units and frame of reference they use to measure.
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In most psychological research, psychologists start with a hypothesis, usually based on established theory, then gather data through careful observations, and then analyze the data to determine if their observations support the hypothesis. in such situations, what type of reasoning are psychology researchers using?
Psychology researchers are using deductive reasoning.
In psychological researches, reasoning is important to reach conclusions. Two important types of reasoning used by researchers are: Inductive reasoning and deductive reasoning.
In deductive reasoning, psychological research starts with a hypothesis formed from a general theory and then try to establish it true in real cases. They start from predicted conclusions or assumptions first and then gather data through careful observations to support the hypothesis. After analyzing the data thus collected, they will prove their assumptions true in specific cases of the theory. So deductive reasoning is used to prove general ideas in empirical observations.
However, inductive reasoning is opposite to this approach. It incorporates the method of reaching conclusions by beginning with observed data to make new theories.
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What is the relationship between change in position and velocity?
Answer:
Position and velocity are both vector quantities. Because velocity is the rate of change of position with respect to time, there is a very close relationship between position and velocity. When the position remains constant, the corresponding velocity is zero because there is no change in position and the object is effectively at rest.
Explanation:
Will the velocity of an object change when moving across a surface with NO friction? Explain?
This question is very complicated.
But the short answer is: NoYou see to determine wether an object's velocity changes, we would look at if that object is accelerating or not, that is the literal definition of acceleration.
Newton's second Law of motion suggests that:
[tex]f = ma[/tex]
where f and a are vectors, meaning that a change in direction could mean that the velocity of an object has changed.
If an object is not subjected to friction, it could be subjected to other forces like drag,air resistance,ect... these are called resistive forces.
To make this simpler for you, if you mean that will no friction imply that the speed will minimally change then YES absolutely.
But if you mean that if the object is subjected to no friction (not resistive forces), will that object maintain a constant velocity (speed+direction), probably NOT.
When you drop a 0.36 kg apple, Earth exerts
a force on it that accelerates it at 9.8 m/s2
toward the earth’s surface. According to Newton’s third law, the apple must exert an equal
but opposite force on Earth.
If the mass of the earth 5.98 × 1024 kg, what
is the magnitude of the earth’s acceleration
toward the apple?
Answer in units of m/s2
The magnitude of the earth’s acceleration toward the apple is -9.8m/s^2.
What is gravity?The term gravity refers to the attractive force that acts towards the center of the earth. We know that force is a vector quantity hence it has both magnitude and direction. Given this fact, the acceleration that this force produces also must have a magnitude and a direction.
In this case, we have been told that the a force on it that accelerates the apple at 9.8 m/s2 toward the earth’s surface. Recall that according to Newton's third law, the apple does exert a force that is equal in magnitude to the force of gravity.
The acceleration that is produced by the force is of the same magnitude but in opposite direction to that produced by gravity. Thus, the magnitude of the earth’s acceleration toward the apple is -9.8m/s^2.
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What do you observe when holding your plastic shopping bag between the light source and the wall
when holding your plastic shopping bag between the light source and the wall we will observe a large shadow in a dark color on the wall.
When we hold the largest plastic shopping bag between the light source and the wall the plastic bag will block the light.
When an object blocks the light way light can't pass through that object and where the light can't pass there we will observe a dark shadow
So here we can say that when we hold a bag between light and wall we will observe a shadow
If the bag is transparent still will we can see a shadow but not as dark as before because when light passes through a transparent it will allow some light through it but not like other materials.
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Determine the time that a paper airplane will fly with an initial velocity of 3.5 m/s
A. 0.36 seconds
B. 2 seconds
C. 3 seconds
D. 0.5 seconds
The time taken for the paper airplane to fly with an initial velocity of 3.5 m/s is 0.36 s (Option A)
Given parameters:Considering the question given, the following data were obtained:
Initial velocity (u) = 3.5 m/sAcceleration due to gravity (g) = 9.8 m/s²Final velocity (v) = 0 m/s (at maximum height)Time (t) =? How do we determine the time?The time can be obtained as follow:
v = u - gt (airplane is going against gravity)
0 = 3.5 - (9.8 × t)
0 = 3.5 - 9.8t
Rearrange
-9.8t = 0 - 3.5
-9.8t = -3.5
Divide both sides by -9.8
t = -3.5 / -9.8
t = 0.36 s
Thus, we can conclude that the time taken for the airplane to fly is 0.36 s (Option A)
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Which object has the most thermal energy?
Gaseous substances have the highest thermal energy, followed by liquids and then solids under the same other conditions.
The total thermal energy of a substance is determined by its temperature, atomic composition, and physical condition. More thermal energy results from more atoms and a higher temperature.
Thermal energy, commonly known as internal energy, is the energy connected to microscopic types of energy in thermodynamics. Depending on the size of the system or the amount of chemical it contains, it is a sizable amount. The joule(J) is the SI unit for thermal energy. It is the energy in the system that is left after subtracting its collective kinetic energy and potential energy. The energy that results from rotation, vibration, motion, and interactions between molecules of matter are all examples of microscopic kinds of energy.Learn more about thermal energy here:
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a baseball is moving at a speed of 2.2\,\dfrac{\text{m}}{\text{s}}2.2 s m 2, point, 2, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when it strikes the catcher's glove. the padding of the glove is compressed by 2.4\,\text{mm}2.4mm2, point, 4, start text, m, m, end text before the ball comes to a stop. we want to find the average acceleration of the baseball while it is compressing the glove. which kinematic formula would be most useful to solve for the target unknown? assume the initial direction of travel is the positive direction.
The average acceleration of the baseball while it is compressing the glove is 1008 10⁻³ m / s². The kinematic formula used is v² = v₀² - 2 a x.
What is acceleration?Acceleration is the rate of change in a moving object's speed and direction over time. When a point or object accelerates or decelerates, it is moving straight forward. Motion on a circle increases despite the same speed because the direction is always changing.
Because the acceleration occurs in the opposite direction as the speed and the end speed is zero, the sign is negative.
0 = v₀² - 2 an x
a = v₀² / 2x
Consider converting the magnitudes to the SI system.
x = 2.4 mm (1 meter / 103 mm) = 2.4 103 m
Let's compute.
a = 2.2²/2 2.4 10⁻³
a = 1008 10⁻³ m / s²
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A small electric heater has a resistance of 15ohms when the current in it is 2 amperes. what voltage is required to produce this current.
A small electric heater has a resistance of 15ohms when the current in it is 2 amperes. what voltage is required to produce this current:V = IR, V = 2A x 15Ω, V = 30V.
What does voltage mean?The "pressure" that pushes electricity is referred to as voltage. A voltage is measured in volts (V), and greater voltages result in more electricity flowing to electronic equipment.Simply put, voltage—also known as an electromotive force—is the amount of energy in one charge. Voltage, then, is the variation in electric potential between two places. Simply put, the current is the pace at which electric charge flows.Customers are typically given 110 to 120 volts (AC) and 220 to 240 volts by power companies (AC). Typically between 110 and 1200 kV, the voltage of electric power transmission lines used to transfer electricity from power plants can be hundreds of times higher than consumer voltages (AC).A small electric heater has a resistance of 15ohms when the current in it is 2 amperes. What voltage is required to produce this current:
V = IR
V = 2A x 15Ω
V = 30V.
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What acceleration does it take to reach 15 m/s (from rest) in 5 seconds?
Answer:
The answer is simple….
As we know v = u + (a×t)
Where
v is the final velocity
u is the initialvelocity
a is the acceleration
t is the time taken
So according to the question:-
u=0, v=15 , a=3 and we have to find t…
So the equation is written as:-
15 = 0 + (3×t)
=> t = (15 ÷ 3) = 5
Therefore, the time required is 5 seconds..
it is raining. the rain falls at 12 m/s at an angle of 30˚ east of the vertical. a person is driving through the rain heading east at 20 m/s. a. as the person glances out of their driver’s side window, what angle does the rain appear to make with the vertical? 53.4˚ w of vertical b. what is the apparent speed of the rain as seen by the driver of the car in that window? 17.43 m/s
Rain falls downward at 6m/s and wind started to flow horizontally. Due to the flow of wind, if the bus driver saw the rain falls vertically downwards.
What is Rain falls?
Rain is made up of water vapor droplets that have condensed from the atmosphere and have fallen due to gravity. Most of the fresh water that falls to the Earth as rain is deposited by rain, which is an important part of the water cycle. It offers irrigation for crops, water for hydroelectric power plants, and favorable environmental conditions for a variety of ecosystems. Moisture traveling along weather fronts, three-dimensional zones of temperature and moisture differences, is the primary driver of rain formation. When convective clouds (those with strong upward vertical motion) like cumulonimbus (thunder clouds), which can condense into narrow rainbands, are sufficiently wet and moving upward, precipitation can form. Where upslope flow is maximum inside windward sides of the topography, considerable precipitation is possible in mountainous places.
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Name the element with 4 valence electrons and 6 energy shells
Answer:
Carbon
Explanation:
Carbon has 6 protons or the electron distribution (equal to protons) is equal to 2 in first energy shell and 4 in the outer energy shell. This makes the carbon atom look out for four electrons to fill it's octet.
Answer: Carbon
Explanation:
carbon has 4 valence electrons (in the outermost shell) and it has 6 energy shells (also known as electron shells)
Effect of Solvent:
1. Record the results.
1. H₂O =
2. alcohol =
3. glycerin =
2. In which liquid is the salt most soluble?
3. Using the concept of "Like dissolves like," explain why you got the results you did.
4. Explain how the choice of solvent affects the dissolving process.
1. H2O- The water completely dissolved the salt.
Alcohol- The alcohol dissolved the salt slightly.
Glycerin-The salt has not dissolved at all.
2. Water
3. Like dissolve like basically works on the principle of polarity. It means the substances which possess similar chemical properties may dissolve in each other. For example, ethanol can be dissolved in water because both are polar in nature whereas non-polar molecules can be dissolved in non-polar solvents only.
4. Generally, a solute dissolves faster in a warmer solvent than it does in a cooler solvent because particles have more energy of movement. For example, if you add the same amount of sugar to a cup of hot tea and a cup of iced tea, the sugar will dissolve faster in the hot tea.
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Answer:
this guy right but this is only part 1
Explanation:
A hot air balloon starts rising from ground with an acceleration 1.25m/second square. after 8 sec, a stone is dropped from the balloon, time taken to hit the ground will be ?
The stone that is dropped from the balloon, will hit the ground in a time of: 2.857 s
To solve this exercise the formula for uniformly varied rectilinear motion (UVRM) and free fall to be applied are:
h = vi * t + (a * t²) / 2t = √[ (2*h) / g]Where:
a = accelerationvi = initial velocityh = height traveledg = acceleration due to gravityt = timeInformation about the problem:
vi = 0 m/st = 8 sa = 1.25 m/s²h = ?g = 9.8 m/s²t = ?Applying the formula for UVRM we can calculate the height of the hot air balloon:
h = vi * t + (a * t²) / 2
h = 0 m/s * 8 s + [1.25 m/s² * (8 s)²] / 2
h = 0 m + [1.25 m/s² * 64 s²] / 2
h = 0 m + 80 m / 2
h = 80 m/ 2
h = 40 m
Knowing height of the hot air balloon and applying the time formula we can calculate the time taken for the stone to hit the ground:
t = √[ (2*h) / g]
t = √[ (2* 40 m) / 9.8 m/s²]
t = √[ 80 m / 9.8 m/s²]
t = √[ 8.163 s²]
t = 2.857 s
What is free fall?It is when the object or mobile falls from a height (h) with a positive acceleration equal to the gravity, describing a vertical rectilinear travel.
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A person riding in an airplane drops a rock out of the door of the plane which is moving at 550 mile/hr. The airplane remains on its original horizontal path and maintains a constant velocity. Where will the airplane be located when the rock hits the ground? neglect air resistance.
By using uniform motion, the location of the airplane when the rock hits the ground is ( 550 . √(2h/g) + h )miles.
We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.
From the question above, we know that
vo = 550 mile/h
Find the time taken to hit the ground
s = vo . t + 1/2 . a . t²
h = 0 . t + 1/2 . g . t²
t² = 2h/g
t = √(2h/g)
Find the distance traveled by plane
s = vo . t + 1/2 . a . t²
x = vo . t + 1/2 . a . t²
x = 550 . √(2h/g) + 1/2 . g . √(2h/g)²
x = 550 . √(2h/g) + h
the distance traveled is ( 550 . √(2h/g) + h )miles.
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