The calculated velocity is 3.88 m/s
Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is travelling along a path. In other words, velocity is a vector, whereas speed is a scalar value. The parameters of speed are time divided by distance. The most often used unit of speed in daily life is the kilometer per hour (km/h), or miles per hour in the US and the UK. The SI's unit of speed is the meter per second (m/s) (mph).
h = 0.5g*t² = 0.77 4.9t²
= 0.77\st²
= 0.1571
t = 0.396 seconds or fall.
Dx = Xo*t, or 5.15 meters.
Xo * 0.396 = 5.15
Break speed is X= 13 m/s.
V² = V² + 2g*h.
V² = 0 + 19.6*0.77
= 15.09
V = 3.88 m/s
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what is a reference point or reference frame
A baseball is popped straight up with an initial speed of 25.9 meters per second. What is the ball's velocity after it has traveled a total distance of 50.0 meters? Include units in your answer.
The ball's velocity after it has travelled a total distance of 50.0 meters is 40.63 m/s
Data obtained from the questionThe following data were obtained from the question:
Initial velocity (u) = 25.9 m/sAcceleration due to gravity (g) = 9.8 m/s²Height (h) = 50 mFinal velocity (v) = ?How to determine the final velocityWe can obtain the final velocity as illustrated below:
v² = u² + 2gh
v² = 25.9² + (2 × 9.8 × 50)
v² = 670.81 + 980
v² = 1650.81
Take the square root of both sides
v = √1650.81
v = 40.63 m/s
Thus, the velocity after travelling 50 m is 40.63 m/s
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Why does a mirror or glass polished by dry cloth on a dry day soon gets dirty
As per the given question;
On a dry day, a mirror or window polished with a dry cloth quickly develops dust. Dry cloth friction on glass produces charged static electricity, which attracts microscopic non-charged dust particles.
What is static electricity?Static electricity can cause problems or even pose a risk. Your hair standing on end energy can also destroy electronics and cause explosions. However, it can also be a huge asset to modern life when properly managed and manipulated.
When the positive and negative charges are out of balance, static electricity is produced. While electrons like to jump all over the place, protons and neutrons don't move around that much. A negative charge is present when an object (or person) has extra electrons.
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A remote controlled toy car starts from rest and begins to accelerate in a straight line. The figure below represents "snapshots" of the car's position at equal 0.5 s time intervals. (Assume the positive direction is to the right. Indicate the direction with the sign of your answer.)
A. The car's average velocity (in m/s) in the interval between t = 1.0 s to t = 1.5 s is 1 m/s
B. The car's acceleration (in m/s²) at t = 1.5 s is 0.4 m/s²
C. The speed of the car is increasing with time
A. How to determine the average velocity between t = 1.0 s to t = 1.5 sTotal time = 1.5 - 1 = 0.5 sTotal distance = 0.9 - 0.4 = 0.5 mAverage velocity =?Average velocity = total distance / total time
Average velocity = 0.5 / 0.5
Average velocity = 1 m/s
B. How to determine the acceleration at t = 1.5 sWe'll begin by calculating the velocity at t = 1.5 s. This can be obtained as follow:
Distance = 0.9 mTime = 1.5 sVelocity =?Velocity = Distance / time
Velocity = 0.9 / 1.5
Velocity = 0.6 m/s
Finally, we shall determine the acceleration . This is shown below:
Time = 1.5 sVelocity = 0.6 m/sAcceleration =?Acceleration = velocity / time
Acceleration = 0.6 / 1.5
Acceleration = 0.4 m/s²
C. How to determine if the speed is increasing or notThe acceleration we calculated above (i.e 0.4 m/s²) is positive. This simply indicates that the speed of the car is increasing.
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Missing part of the question:
(a) What is the car's average velocity (in m/s) in the interval between t = 1.0 s to t = 1.5 s?
(b) Using data from t = 1.0 s to t = 2.0 s, what is the car's acceleration (in m/s2) at t = 1.5 s?
(c) Is the car's speed increasing or decreasing with time?
How do ice cubes form in the freezer?
Answer:
In a freezer, the air molecules absorb energy from the water, causing the water molecules to freeze into a solid.
Answer: Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike
Explanation:
Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike. Eventually, the whole thing freezes and the spike is left.
Which set of labels should be used to correctly complete the atomic model below?
a.
1 - Electron
2 - Nucleus
3 - Neutron
4 - Proton
b.
1 - Proton
2 - Electron
3 - Neutron
4 - Nucleus
c.
1 - Neutron
2 - Proton
3 - Nucleus
4 - Electron
d.
1 - Proton
2 - Neutron
3 - Electron
4 - Nucleus
Answer:
d. 1-proton 2-nuetron 3-electron 4-nucleus
What is the current in the 60.0 Q resistor? 120.0 V O A. 80.0 A B. 2.00 A O C. 1.50 A OD. 12.0 A 60.002 20.0 Q A
2A
Given ,
Resistance=60
V=12
V=IR
I=V/R
I=120/60=2A
The pace at which electrons flow past a location in a complete electrical circuit is defined as current. At its most fundamental, current Means flow.
An ampere (AM-pir), sometimes known as an amp, is the international unit for measuring current. It denotes the number of electrons (also known as "electrical charge") that pass across a location in a circuit over a specific time period.
A current of one ampere indicates that one coulomb of electrons—that is, 6.24 billion billion (6.24 x 1018) electrons—moves across a circuit in one second. The method is comparable to determining how many gallons move through a single spot in a pipe in one minute (gallons per minute, or GPM).
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A train changes its velocity from 70km / h to 20km / h in 6 s The distance it covered is:
a) 75.0 m
b) 9.87 m
c) 15.4 m
d) 20.6 m
The distance covered by the train will be 75 meters.
What is the equation of motion?Physics equations called equations of motion describe how a physical system acts in terms of how its motion alters over time.
The equations of motion, which are a group of mathematical functions stated in terms of dynamic variables, provide a more thorough description of how a physical system behaves.
Given that a train changes its velocity from 70km / h to 20km / h in 6 s.
Use the first equation of motion:-
V= U + at
20 = 70 + ( 1 / 600)a
-50 = ( 1 / 600)a
a = -30000
Use another equation of motion:-
V² = u² + 2as
20² = 70² + 2 ( -30000)S
400 - 4900 = -60000S
-4500 = -60000S
S = -4500 / -60000
S = 0.075 KM
S = 75 meters
Therefore, the distance covered by the train will be 75 meters.
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find the component form of the vector V (0,1) (6,7/2)
Answer:
I would interpret it to mean:
Vx = (6 - 0) = 6
Vy = (3.5 - 1) = 2.5
or V = (6, 2.5)
V refers to the vector itself and not its relative position in space
A 190 g block hangs from a spring with spring constant 9.0 N/m. At t=0s the block is 29 cm below the equilibrium point and moving upward with a speed of 116 cm/s.
What is the block's oscillation frequency?
What is the block's distance from equilibrium when the speed is 57 cm/s ?
What is the block's distance from equilibrium at t = 7.0 s ?
The block's oscillation frequency is 1.1 Hz.
The block's distance from equilibrium when the speed is 57 cm/s is 14.2 cm.
The block's distance from equilibrium at t = 7.0 s is 10.37 cm.
Oscillation frequency of the block
The oscillation frequency of the block is calculated as follows;
f = 1/2π√(k/m)
f = 1/2π √(9/0.19)
f = 1.1 Hz
Angular speed of the blockω = 2πf
ω = 2π x 1.1
ω = 6.91 rad/s
Equation of the block's motionx(t) = A cos(ωt + Φ)
at t = 0, phase constant is calculated asωX sin(Ф) = v
6.91 x 29 sin(Ф) = 116
sin(Ф) = 116/200.39
sin(Ф) = 0.579
Ф = arc sin(0.579)
Ф = 0.62 rad
Amplitude of the wave29 = A cos(6.91 x 0 + 0.62)
29 = A cos(0.62)
29 = A(0.814)
A = 35.63 cm
Distance of the block at given speedwhen the speed is 57 cm/s, the distance of the block is calculated as follows;
ωX sin(Ф) = v
(6.91)X sin(0.62) = 57
X(4.015) = 57
X = 57/4.015
X = 14.2 cm
Distance of the block at given timex(t) = A cos(ωt + Φ)
x(7) = 35.63 cos(6.91 x 7 + 0.62)
x(7) = 10.37 cm
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Question 4 of 10
Which of the following describes the reactants of a chemical reaction?
OA. The chemicals on the right side of a chemical equation
B. The substances that are formed
OC. The substances that are made
O D. The chemicals on the left side of a chemical equation
The substances that are altered and the chemicals on the right side of a chemical equation are the results of a chemical reaction. B and D are the appropriate choices.
Reactants are the substance(s) in a chemical equation to the left of the arrow. A component that is present at the outset of a chemical reaction is known as a reactant. Products are the substance(s) to the right of the arrow. A substance that remains after a chemical reaction is complete is known as a product. The creation of products from the reaction of two reactants is known as a chemical reaction. The compounds that result from a reaction are called products. The substances that are original materials are the reactants.
On the left side of the reaction are the reactants, and on the right are the products. B and D are the proper choices as a result.
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would anyone be able to help me? I'm struggling with the last 2 parts
The time taken for the train to stop is 8.9 seconds.
The distance traveled by the train during acceleration is 9,984 m.
The distance traveled by the train during deceleration is 17.8 m.
Time taken for the train to stop
Use the following kinematic equation to determine the time taken for the train to stop.
v = u + at
where;
v is the final velocity of the train = 0u is the initial velocity = 4 m/sa is the deceleration = -0.45 m/s²t is time of motion0 = 4 - 0.45t
0.45t = 4
t = 4/0.45
t = 8.89 seconds = 8.9 seconds
Distance traveled by the train during accelerations = ut + ¹/₂at²
where;
t is time of motion = 8 min = 480 secondss = (4)(480) + ¹/₂(0.07)(480)²
s = 9,984 m
Distance traveled by the train during decelerations = ut + ¹/₂at²
s = (4 x 8.9) + ¹/₂(-0.45)(8.9)²
s = (4 x 8.9) - ¹/₂(0.45)(8.9)²
s = 17.8 m
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Which is true about mass and weight?
Mass depends on location, weight is the same everywhere.
Mass and weight are the same thing.
Objects dropped in a vacuum (no air) will fall at different rates because they have different weights.
Mass is measured with a spring scale.
Mass must be in kg and weight in N to do our calculations.
The statement that is true about mass and weight is as follows: Mass must be in kg and weight in N to do our calculations (option E).
What is mass and weight?Mass is the quantity of matter which a body contains, irrespective of its bulk or volume. The mass of a substance is measured in kilograms.
On the other hand, weight is the force on an object due to the gravitational attraction between it and the Earth. It is measured in Newtons.
The mass of an object is the same everywhere, however, it's weight is dependent on location. For example, the weight of an apple on Earth will differ from it's weight in Mars.
Therefore, the statement that is true about mass and weight is as follows: Mass must be in kg and weight in N to do our calculations.
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Four people participate in a rope competition. Two of them pull the rope right exerting forces of magnitude 330 N and 380 N. The other two pull left exerting forces of magnitude 320 N and 410N.
A rope competition is played out between four participants. They both pull on the rope to the right while producing forces between 330 N and 380 N. The other two pull to the left with forces of 320 N and 410 N, respectively.
T2 = 250 and T1 = 250.57 [N] .57[N]
In order to create a free body diagram with all the forces acting on the body, we must first extract all the information they provide about the issue.
The free body diagram and associated forces are shown in the accompanying figure.
The T1 and T2 forces can be found by adding up the forces on the Y-axis; these forces are equal because they are a precondition for the problem. Therefore, this equation can be solved.
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: list five Derived quantities
Answer:
pascal
energy,
power,
electric charge,
Explanation:
A car travels 60 m/s for 60 secs.
Calculate how far it traveled.
The formula for distance = speed * time
60 m/s is the speed.
60 secs is the time.
Fill them in.
distance = 60 * 60
distance = 3600
please give brainliest
Answer:
3600m
Explanation:
s= vt
= 60m/s × 60sec
=3600m
What would decrease the gravitational pull between the sun and Earth?(1 point)
Responses
a. if the sun was twice its size
if the sun was twice its size
b.
if Earth was twice its size
if Earth was twice its size
c. if Earth was closer to the sun
if Earth was closer to the sun
d. if the sun was farther away from Earth
if the sun was farther away from Earth
The gravitational pull between the sun and Earth decreases if the sun was farther away from the earth.
What is Gravitational Force?Any two bodies' gravitational pull on one another is directly proportional to the product of their masses and inversely proportional to the square of their distance from one another.
How do the planets move in relation to the Sun? The planets' orbits around the Sun are maintained by the gravity of the Sun. The Moon orbits the Earth due to the Earth's gravitational pull on the Moon for the same reason. But if the Earth is being drawn to the Sun, why doesn't it fall into it or the Moon strike the Earth?
The cause of this is because Earth moves at a speed that is perpendicular to the Sun's gravitational pull. The planets are thus kept in their designated orbits by the Sun's attraction as well as their sideways motion. Similar to how the Earth orbits the Moon, the Moon does so without touching it.
F=G(M1M2)/R² where,
F denotes gravitational force between two bodies,
R is the distance between two bodies from their center,
M1 denotes mass of first body and,
M2 denotes mass of second body.
So according to the question, if the distance between two bodies will increase, then the gravitational force between them will also decrease.
Hence, if the sun was farther away from earth, then gravitational pull between the sun and earth will decrease.
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what exactly is science?
( an answer that wld express a physics teacher please :) )
Answer:
he intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
the tension T in Newtons in the string of a yoyo of mass 0.001kg is give by the function of two variables (see equation in photo).
find the approximate change in T if R increases from 4cm to 4.1cm and r increases from 0.8cm to 0.9cm. use your answer to explain if the tension increases or decreases.
The change in the tension if the radii r changes from 4.0 cm to 4.1 cm, and R changed from 0.8 cm to 0.9 cm is negative, therefore, tension reduces.
How can the correct description of the change in the graph of the function be found?
Mass of the yoyo = 0.001 kg
Initial value of the spindle radius, R = 4 cm
Initial length of the radius of the yo–yo, r = 0.8 cm
The final values are;
R2 = 4.1 cm, r2 = 0.9 cm
Which gives;
[tex]T_{r \:R} = \frac{0.001 \cdot g \cdot R }{2 \cdot r^{2} + R^2} [/tex]
Which gives;
[tex]T_{{r _1 \:R _1 }} = \frac{0.001 \times 9.8 \times 0.04 }{2 \times 0.008^{2} + 0.04²} = \frac{49}{216} [/tex]
[tex]T_{{r _2 \:R _2 }} = \frac{0.001 \times 9.8 \times 0.041 }{2 \times 0.009^{2} + 0.041^2} = frac{2009}{9215} [/tex]
Therefore;
[tex] \Delta T_{{r \:R }} = frac{2009}{9215} - \frac{49}{216} = - \frac{17591}{1990440} [/tex]
Given that difference between the final and the initial states is negative, the the value of the tension decreases
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. Which of the following is the last part of the technological design process? test and evaluate a solution research existing solutions refine the original solution design decide on a solution
According to the research, the correct option is to refine the original solution design. It is the last part of the technological design process.
What is the technological design process?It is the process and problem solving using design as a methodological strategy that allows identifying and solving a problem through inductive procedures and logical reasoning.
In this sense, the last part of this process includes what refers to the production of a first model of the solution, which is tested to evaluate its performance, the result of this evaluation must influence the modification or refinement of the original solution design that is implemented in the solution of the problem that gave rise to the generation of the project.
Therefore, we can conclude that according to the research, the correct option is to refine the original solution design. It is the last part of the technological design process.
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2. 100 grams of oil (specific heat capacity 2200 J/kg °C) heated to 80°C are added
to 200 grams of water (specific heat capacity 4200 J/kg °C) at 20°C. Find the
resulting temperature. Assume heat loss to the surroundings is negligible.
100 grams of oil-heated to 80°C are added to 200 grams of water at 20°C. Then the resulting temperature would be 55.48°C.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
As given in the problem 100 grams of oil (specific heat capacity 2200 J/kg °C) heated to 80°C is added to 200 grams of water (specific heat capacity 4200 J/kg °C) at 20°C
mCΔT for oil =mCΔT for water
100×2200×(80-T) = 200× 4200×(T-20)
1760-22T = 84 T -1680
62T = 1760+1680
T = 55.48°C
Thus, the resulting temperature of the mixture would be 55.48°C.
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(Forces and the Laws of Motion pg. 141; Friction) (Problem 4)
A box of books weighing 325 N moves at a constant velocity across the
floor when the box is pushed with a force of 425 N exerted downward at an
angle of 35.2° below the horizontal. Find μk between the box and the floor.
The coefficient of kinetic friction is determined as 0.75.
What is coefficient of friction?
The coefficient of kinetic friction is calculated by applying the newton's second law of motion.
Fsinθ - Ff = ma
where;
Ff is frictional forceθ is angle of applied forceW = mg
where;
m is mass of the boxm = W/g
m = 325/9.8
m = 33.2 kg
425 sin(35.2) - Ff = 33.2a
425 sin(35.2) - μW = 33.2a
at constant velocity, a = 0
425 sin(35.2) - μW= 0
μW = 244.98
μ = 244.98/W
μ = 244.98/325
μ = 0.75
Thus, the coefficient of kinetic friction is 0.75.
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Sam's mom says: "We're about to eat dinner! Don't go more than a few blocks from home!" Is Sam's mom
more worried about Sam's distance or his displacement? Circle one and explain why you picked it.
Answer:
Displacement
Explanation:
I think Sam's mom isn't worried with how far away he goes, but will be upset if he isn't home fast enough for dinner.
Which circuit is a series circuit ?
Answer:
the right answer is d
Explanation:
Is the following equation dimensionally correct?
P=√pgh.
where
P is pressure in units of Kg.m/s²/m².
p is density in units of Kg/m³.
g is gravitational acceleration in units of m/s².
h is height in units of m.
The correct answer is :
P = ρgh yields the hydrostatic pressure, which is accurate.
The pressure a liquid applies to nearby bodies when it is at rest is known as hydrostatic pressure.
Water at rest exerts a force known as hydrostatic pressure. It is caused by the water's continual pressure on the basement walls.
The force that blood applies to blood channel walls is a typical illustration of hydrostatic pressure.
Depending on the liquid's density ('ρ'), the height of the water column ('h'), and the acceleration caused by gravity ('g'), the hydrostatic pressure is indicated by the letter "P" of a liquid column.
Because of this, the parameters and the supplied equation P = gh are both accurate.
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II Two electrons are in the vicinity of a proton. The potential energy of the
proton is
-1.6 x 10-25 J. (a) What is the potential at the proton's position? (b) If one of
the electrons is 1.0 cm from the proton, what is the distance of the second
electron from the proton?
Please explain HOW to answer this(especially part B)
There are two electrons close to a proton. The proton's potential energy is
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
9.216 x 10^-8 N
q1 = 1.6 x 10^-19 C
q2 = - 1.6 x 10^-19 C
r = 5 x 10^-11 m
A source of electrostatic force is
F = k q1 q2 / r^2
F = (5 x 10-11)2 / (9 x 109 x 1.6 x 10-19 x 1.6 x 10-19)
F = 9.216 x 10^-8 N
Due to the nature of the charges being in opposition to one another, this force is appealing.
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Select the correct answer.
A force Fmaking an angle 9 with the horizontal is acting on an object resting on the table. Which statement Is true for the motion of sliding the
object on the table?
• A. It Is Independent of all the forces acting on the object.
O B. It depends only on the forces acting along the x-axis.
O C. It depends only on the forces acting along the y axis.
O D. It depends only on the normal force acting on the object.
O E. It depends only on the frictional force acting on the object.
bgGjzbxvbhijhFgavvBbzvghzjznbbgzgh
If a satellite orbiting Earth at an orbiting radius (r) has velocity (v). Which represents the velocity if the satellite is moved to an orbital radius or 4r?
If you can, give an explanation so I can learn it.
The velocity, if the satellite moves to an orbital radius of 4r is V/√4
We know that,
V = √ ( G M / r )
where,
V = Orbital velocity
G = Gravitational constant
M = Mass of the satellite
r = Radius of the orbit
Given that,
r' = 4r
V' = √ ( G M / r' )
V' = √ ( G M / 4r )
V' = ( 1 / √ 4 ) ( √ ( G M / r ) )
v' = v / √ 4
Orbital Velocity is the velocity at which one object revolves around another object in a orbit in uniform circular motion
Therefore, the velocity of the satellite that moved to an orbital radius of 4r is V/√4
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Determine the value of x. A 9.75 B 11 C 22 D 19.5
A. The value of x in the given circular geometry is determined as 9.75.
Value of x in the geometry
The value of x can be calculated by applying the following rules of geometry as shown below.
angle AC = angle at the center
angle at center = twice angle at circumference
147 = 2(6x + 15)
147 = 12x + 30
147 - 30 = 12x
117 = 12x
x = 117/12
x = 9.75
Thus, the value of x in the given circular geometry is determined as 9.75.
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A tank of oxygen has 125 kPa of pressure. The pressure is increased to 200 kPa and the final volume is 0.5 L. What was the initial volume?
According to the given data initial volume =0.667 L
Why is it called Boyle's law?Boyle observed that the product of the pressure and volume are observed to be nearly constant. For a perfect gas, the result of volume and pressure is a precise constant. Boyle's Law is the name given to the relationship among pressure and volume in his honor.
Who discovered Boyle's law?Boyle was a modern chemical pioneer in the 17th century, best known for his law of gases. Robert Boyle (1627–1691) is credited with discovering the renowned Boyle's law, which states that a gas's volume decreases with rising pressure and vice versa
Briefing:Since the change occurs at constant temperature (i.e. an isothermal change), Boyle's law applies,
i.e. p[tex]_1[/tex]V[tex]_1[/tex] = p[tex]_2[/tex]V[tex]_2[/tex] where p[tex]_1[/tex] = 125 kPa, p[tex]_2[/tex] = 200 kPa and V[tex]_2[/tex]=0 .5L
Hence, (150)V[tex]_1[/tex] = (200)(0.5)
from which, volume V[tex]_1[/tex] = 200×0.5/150=0.6667L
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