A student walks to the right, 25-m along the C Hall in 15-s. They turn around and walk 15-m to the left in 8.0-s. What is the average speed and the average velocity? (V represents average speed and ΔV represents average velocity)
Answers
For the student that walks to the right 25 m in 15 s and then turns and walks to the left 15 m in 8.0 s, we have:
1. The average speed is 1.74 m.
2. The average velocity is 1.42 m.
1. The average speed is an scalar wich is given by:
\( V = \frac{d_{t}}{t_{t}} \)
Where:
\(d_{t}\): is the total distance
\(t_{t}\): is the total time
The total distance and the total time can be calculated as follows:
\(d_{t} = d_{1} + d_{2} = 25 m + 15 m = 40 m \)
\( t_{t} = t_{1} + t_{2} = 15 s + 8.0 s = 23 s \)
Since V is a scalar, the direction of motion is not important to calculate the final value.
Then, the average speed is:
\( V = \frac{d_{t}}{t_{t}} =\frac{40 m}{23 s} = 1.74 m/s \)
2. The average velocity is a vector, so the direction of motion is important here. This ΔV can be calculated with the following equation:
\( \Delta V = \frac{\Delta x}{\Delta t} = \frac{x_{f} - x_{i}}{t_{f} - t_{i}} \)
Where:
x: is the displacement
f: is for final and i: is for initial
Hence, the average velocity is:
\( \Delta V = \frac{x_{f} - x_{i}}{t_{f} - t_{i}} = \frac{15 m - 25 m}{8.0 s - 15 s} = 1.42 m/s \)
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Related Questions
please solve due is today....asap please
Answers
Answer:
a)object is in uniform motion
Explanation:
velocity is constant.and a=0
body is in uniform motion.
BRAINLIST PLS
One half of a balanced chemical equation is shown. 3Mg(OH)2 + 2H3PO4
Answers
Answer:
3 Mg, 2 P, 14 O, 12 H
Explanation:
Help me plzzz
And thank u
Answers
Answer:
$ 1.1
Explanation:
From the question given above, the following data were obtained:
Cost per kWh = $ 0.1
Current (I) = 10 A
Voltage (V) = 220 V
Time (t) = 5 h
Cost of operation =?
Next, we shall determine the power the electric oven. This can be obtained as follow:
Current (I) = 10 A
Voltage = 220 V
Power (P) =?
P = IV
P = 10 × 220
P = 2200 W
Next, we shall convert 2200 W to KW. This can be obtained as follow:
1000 W = 1 KW
Therefore,
2200 W = 2200 W × 1 KW / 1000 W
2200 W = 2.2 KW
Thus, 2200 W is equivalent to 2.2 KW.
Next, we shall determine the energy consumed by the electric oven. This can be obtained as follow:
Power (P) = 2.2 KW
Time (t) = 5 h
Energy (E) =?
E = Pt
E = 2.2 × 5
E = 11 KWh
Finally, we shall determine the cost of operation. This can be obtained as follow:
1 KWh cost $ 0.1
Therefore,
11 KWh will cost = 11 × 0.1
11 KWh will cost = $ 1.1
Therefore, the cost of operating the electric oven is $ 1.1
What is the function of hammer and anvil in human ear
Answers
Answer:
Vibrations of the eardrum are in turn translated into oscillations of tiny bones (ossicles) found within the middle ear. The Hammer, Anvil, and Stirrup magnify the oscillations and relay this information to the chamber of the inner ear.
Answer:
The Hammer, Anvil, and Stirrup magnify the oscillations and relay this information to the chamber of the inner ear.
How did Hypatia contribute to the study of philosophy? She became a teacher at Alexandria. She improved upon the works of Plato. She was educated in both science and mathematics. She studied Euclid’s theories and proved them incorrect.
Answers
Answer:
she improved upon the works of plato
Answer: A she became a teacher at Alexandria
Explanation:
What is the mass,volume,density and relative density?
Answers
mass = 2.76 g
volume = 25.5 mL
density of the fluid = 2.5 g/mL
R. D = Density of fluid
Density of water
Density of water = 1g/mL
R. D = 2.5/1
R. D = 2.5
The nucleus of some isotopes will spontaneously undergo nuclear decay. these isotopes are said to be radioactive. what causes the nucleus of an isotope to be radioactive?
the electric force and nuclear forces are in opposition to each other
nuclear forces disintegrate protons
there are too many electrons in its orbitals
the electric force causes electrons to be released
(please help i genuinely cant find out why)
Answers
These isotopes are said to be radioactive under nuclear forces disintegrate protons is the reason for the nucleus of an isotope to be radioactive. The correct option is option (B).
The nucleus of an isotope becomes radioactive when the forces within the nucleus are not balanced, leading to an unstable configuration. This instability can result in spontaneous nuclear decay, where the nucleus emits particles or energy to achieve a more stable state.
As a result, the nucleus may undergo radioactive decay by emitting alpha particles (helium nuclei), beta particles (electrons or positrons), or gamma rays.
The electric force (Coulombic force) between protons tends to push them apart due to their positive charges.
The number of electrons in its orbitals does not directly influence the radioactivity of an isotope. Radioactivity is primarily determined by the composition and stability of the nucleus.
Therefore, option (B) is the one that should be.
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A 0.5 kg block of playdough moving at 1.5 m/s is smashed into a 0.25 kg blob of playdough. calculate the speed
of the two stuck-together blobs immediately after colliding.
Answers
The final speed of both playdoughs which stick together after the collision is 0.5 m/s
The mass of the first playdough = 0.5 kg
The mass of the second playdough = 0.25 kg
The initial speed of the first playdough = 1.5 m/s
The initial speed of the second playdough = 2 m/s
The final speed of both playdoughs can be found using the formula,
m₁u₁ + m₂u₂ = (m₁ + m₂) v
where m₁,m₂ is the mass of the first and second playdough respectively
u₁,u₂ is the initial speed of the first and second playdough respectively
v is the final speed of both playdough
Let us substitute the known values in the above equation, we get
0.5 x 1.5 + 0.25 x 2 = (0.5 + 0.25) v
0.75 x 0.5 = 0.75v
0.375 = 0.75v
v = 0.375 / 0.75
= 0.5 m/s
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what evidence supports the model of jupiter's galilean satellites forming in a mini accretion disk around jupiter?
Answers
The mass trend that among four moons is highest close to Jupiter and decreases with distance, with the inner circular members of this group being slightly lesser than the two end moons.
What are the uses of satellites?There are several satellites in operation. They are used for a number of purposes, including as the weather forecasting, amateur radio, television broadcasting, and the Global Positioning System. They use telescopes to look out at the planetary system in order to do research and collect data.
How many satellites currently exist in orbit?According to UNOOSA statistics from the Concerned Scientists, there are 8,261 satellites orbiting Earth as of December 2022, although only 4,852 among them are currently in use.
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An 18kg block moving at 6 m/s has kinetic energy of
Answers
½ × 18 × 6² = 324 J
hope that helps^^
A 12 kg barrel is pulled up by a rope. The barrel accelerates at . Find the force exerted by the rope. Show all your work.
Answers
The solution is 14.4 N
Steps:
The given values are:
mass
m=12kg
Acceleration
a=1.2m/s²
As we know te formula
⇒force=mass×acceleration
By substituting the values we get,
⇒1.2×1.2
⇒14.4N
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A massless rod is attached to the ceiling by a string. Two weights are hung from the rod: a 0.4-lb weight at its left end and a 1.2-lb weight at its right end. The length of the rod is L and a string is attached (3L/4 from its left end) so that the rod (with attached weights) is horizontal. What is the tension in the string supporting the rod and the attached weights
Answers
The tension in the string supporting the rod and the attached weights is 7.11 N.
Tension in the string supporting the rodThe tension in the string supporting the rod and the attached weights is the sum of the weights supported by the strings.
T = (m1 + m2)g
where;
m1 and m2 are the two masses supported0.4lb + 1.2lb = 1.6lb = 0.725 kg
T = 0.725 x 9.8
T = 7.11 N
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What is 645 g to kg?
Answers
Answer:
0.645 kg
Explanation:
because 1 kg = 1000 g
so 1 g = 1/1000 kg = 0.001 kg
645 g = (645 x 0.001) kg = 0.645 kg
using the circuit diagram
find the emf
Answers
Answer:
karhgjgngkjjgbcnhbhbnfnbhkjd jhdjsgg
If an object has a potential energy of 15 J and a kinetic energy of 20 J. What is the mechanical energy of the object?
Answers
Answer:
Mechanical energy = 35 Joules
Explanation:
Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;
a. Potential energy (P.E): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (K.E): it is an energy possessed by an object or body due to its motion.
Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body.
Mathematically, it is given by the formula;
Mechanical energy = P.E + K.E
Given the following data;
Potential energy = 15 J
Kinetic energy = 20 J
To find the mechanical energy;
Mechanical energy = P.E + K.E
Mechanical energy = 15 + 20
Mechanical energy = 35 Joules
Answer:
Mechanical energy = 35 Joules
Explanation:
Starting from rest, a freely falling object falls 125 meters in?
Answers
Answer:
5.05 sec
Explanation:
h = 1/2gt²
solve for t:
t² = (2h)/g
t = √(2h)/g = √((2)(125 m)) / (9.8 m/s²) = 5.05 s
A baseball M equals 150.0 G is traveling at 40.0 MS how much work must be done to stop the ball
Answers
The work that must be done to stop the baseball of mass 150 g is 120 J.
What is work?Work is said to be done when force moves a body through a certain distance.
To calculate the work that must be done to stop the ball, we use the formula below.
Formula:
W = mv²/2................................. Equation 1Where:
W = Work that must be done to stop the ballm = Mass of the baseballv = Velocity of the baseballFrom the question,
Given:
m = 150 g = 0.15 kgv = 40 m/sSubstitute these values into equation 1
W = (0.15×40²)/2W = 120 JHence, the work that must be done to stop the baseball is 120 J.
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A rectangular loop of width w and length l moves with a constant velocity ~v away from a long, straight wire carrying a current I. The resistance of the loop is R. What is the magnitude and direction of the induced current in the loop when the side nearest the wire is a distance r away from the wire
Answers
The magnitude of the induced current in the loop is I_induced = (I * l * v) / (R * w). The direction of the induced current depends on the direction of the magnetic field produced by the current-carrying wire and the motion of the loop.
The magnitude of the induced current in the loop can be determined using Faraday's Law of electromagnetic induction. According to Faraday's Law, the induced electromotive force (EMF) in a loop is equal to the rate of change of magnetic flux through the loop. Mathematically, it can be expressed as:
EMF = -dΦ/dt
In this case, the magnetic flux through the loop is given by:
Φ = B * A
where B is the magnetic field and A is the area of the loop.
The magnetic field produced by the current-carrying wire at a distance r away from the wire can be calculated using Ampere's Law:
B = (μ0 * I) / (2π * r)
where μ0 is the permeability of free space and I is the current in the wire.
The area of the loop is A = l * w.
Substituting the values into the equation for magnetic flux, we have:
Φ = B * A = ((μ0 * I) / (2π * r)) * (l * w)
Taking the derivative of magnetic flux with respect to time, we get:
dΦ/dt = (μ0 * l * w * v * I) / (2π * r)
The negative sign in Faraday's Law indicates the direction of the induced current. Therefore, the magnitude of the induced current in the loop is given by:
I_induced = (μ0 * l * w * v * I) / (2π * r * R)
The magnitude of the induced current in the loop is given by I_induced = (μ0 * l * w * v * I) / (2π * r * R), where μ0 is the permeability of free space, l is the length of the loop, w is the width of the loop, v is the velocity of the loop, I is the current in the wire, r is the distance from the wire, and R is the resistance of the loop. The direction of the induced current depends on the direction of the magnetic field produced by the current-carrying wire and the motion of the loop.
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Impulse can be defined as
The frequency at which something occurs
The change in velocity
The change in momentum from an force within the system
The change in momentum from a force outside of the system
Answers
Explanation:
The change in momentum from an force within the system.
Consider a day in the physics lab room with room temperature of 20 0C and pressure of 1.0 atm. A container of 3.5 L is left open to the air for a long time. The container is then sealed and place on a Bunsen burner until its temperature reaches 95 0C. It is then open. How many moles of air escape?
Answers
Answer:
The number of moles of air that escape is approximately 0.027 moles
Explanation:
The room temperature, T₁ = 20 °C = 298.15 K
Atmospheric pressure, P₁ = 1.0 atm
The volume of the container, V₁ = 3.5 L
The final temperature of the air in the container after heating on the Bunsen burner, T₂ = 95 °C = 368.15 K
The container opened finally
The ideal gas equation is P·V = n·R·T
∴ n = P·V/(R·T)
Where;
R = The universal gas constant = 0.08205 L·atm/(mol·K)
Therefore, we get;
n₁ = 1.0 × 3.5/(0.08205 × 298.15) ≈ 0.143
The number of moles, n₁ ≈ 0.143 moles
When the gas is heated to 95 °C, the number of moles becomes
n₂ = P₂·V₂/(R·T₂)
P₂ = 1.0 atm atmospheric pressure, V₂ = 3.5 L, the volume of the container, T₂ =
∴ n₂ = 1.0 × 3.5/(0.08205 × 368.15) ≈ 0.116
The number of moles of air remaining in the container, n₂ ≈ 0.116 moles
The number of moles of air that escape, n = n₁ - n₂
∴ n = 0.143 - 0.116 = 0.027
The number of moles of air that escape, n ≈ 0.027 moles
A force of 49N causes a box to move with an acceleration of 7m/s2. Find the mass of the object
Answers
Answer:
The answer is 7 kgExplanation:
To find the mass of the object given the force and acceleration we use the formula
\(m = \frac{f}{a} \\ \)
where
f is the force
a is the acceleration
m is the mass
From the question
f = 49 N
a = 7 m/s²
We have
\(m = \frac{49}{7} \\ \)
We have the final answer as
7 kgHope this helps you
hii! help asap. i’ll give brainliest thanks!
Answers
Answer:
a i believe
Explanation:
For a specific volume of 0.2 m3/kg, find the quality of steam if the absolute pressure is (a) 40 kPa and (b) 630 kPa. What is the temperature of each case?
Answers
Answer:
\(x=0.0498\)
\(x'=0.659\)
Explanation:
Specific Volume \(V=0.2m_3/kg\)
Absolute Pressure (a) \(P_a= 40kpa\)
Giving
\(T_a=75.87\)
\(v_f=1.265*10^{-3}m^3/kg\)
\(v_g=3.993m^3/kg\)
(b) \(P_a= 630kpa\)
Giving
\(T_b=160.13C\)
\(v_f'=1.10282*10^{-3} m^3/kg\)
\(v_g'=0.30286 m^3/kg\)
(a)
Generally the equation for quality of Steam X is mathematically given by
\(x=\frac{v-v_f}{v_g-v_f}\)
\(x=\frac{0.2-1.0265*10^{-3}}{3.993-1.0265*10^{-3}}\)
\(x=0.0498\)
(b)
Generally the equation for quality of Steam X is mathematically given by
\(x'=\frac{v-v_f'}{v_g'-v_f'}\)
\(x'=\frac{0.2-1.10*10^{-3}}{3.30-1.1*10^{-3}}\)
\(x'=0.659\)
the two 10-cm-long parallel wires in the figure are separated by 5.0 mm. for what value of the resistor
Answers
The value of the resistor depends on the value of the resistivity of the wires used. For example, if the resistivity of the wires is 2.00×10⁻⁸ ohm-meters, then the resistance of the parallel wire would be:R = 2.00×10⁻⁸ ohm-meters × 1270.88 = 0.0255 ohms. Therefore, the value of the resistor for the given parallel wires would be 0.0255 ohms.
The question involves a problem about parallel wires separated by a distance of 5.0 mm. To find the resistor for a given length of parallel wires, we need to know the value of the resistivity of the wires. We can use the formula to find the value of the resistor. Resistivity (ρ) is a property of materials that tells us how well a material can conduct electricity. It is measured in ohm-meters (Ω.m).The formula for the resistance (R) of a wire with resistivity (ρ), length (L), and cross-sectional area (A) is given by:R = ρ(L/A)where R is the resistance in ohms, ρ is the resistivity in ohm-meters, L is the length of the wire in meters, and A is the cross-sectional area in square meters.Now, we have to determine the resistance of a parallel wire by using the given values. The length of the wire (L) is 10 cm = 0.1 m. The distance between the wires (d) is 5.0 mm = 0.005 m. The cross-sectional area (A) of the wire can be calculated by using the diameter of the wire (d) as follows:A = π(d/2)² = π(0.001/2)² = 7.854×10⁻⁷ m². Now, we can substitute these values into the formula for the resistance of the parallel wire:R = ρ(L/A) = ρ(0.1/7.854×10⁻⁷) = ρ(1270.88)The value of the resistor depends on the value of the resistivity of the wires used. For example, if the resistivity of the wires is 2.00×10⁻⁸ ohm-meters, then the resistance of the parallel wire would be:R = 2.00×10⁻⁸ ohm-meters × 1270.88 = 0.0255 ohms. Therefore, the value of the resistor for the given parallel wires would be 0.0255 ohms.
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What does the Planck function calculate?
Answers
The Planck function, also known as the Planck radiation law, calculates the spectral radiance of electromagnetic radiation emitted by a black body at a given temperature.
A black body is an idealized object that absorbs all radiation incident upon it and emits radiation based solely on its temperature. The Planck function describes the spectral distribution of the radiation emitted by a black body, meaning it gives the amount of energy emitted by the black body per unit time, per unit area of the emitting surface, per unit solid angle, and per unit frequency (or wavelength) of the radiation.
The Planck function is a crucial tool for comprehending how electromagnetic radiation behaves in a variety of contexts, including cosmology, astrophysics, and thermal radiation. It has been used to explain phenomena like the spectrum of stars and galaxies and the cosmic microwave background radiation.
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What is the speed of a 0.15-kg baseball whose kinetic
energy is 77 J?
Answers
Answer:
The speed is 15.5 m/s
The kinetic energy can be written as:K =
(1/2)*m*v^2
where m is the mass and v is the speed.
Then we have that:
18 j = (1/2)*0.15kg*v^2
Now we solve this for v.
✓(18*2/0.15) = v
15.5 m/s = v
Explanation:
I hope it will help you.....
Pls help me I need help thanks.
Answers
Answer: The Answer Is A
Explanation:
the daily tidal range is of the least magnitude during ________.
Answers
Due to the Earth's rotation, the seas' neap tides alter every six hours or so. The Moon and the Sun's gravitational pull on the ocean's water produces the tides themselves.
What usually happens when waves approach shallow water?Waves from deep water become breaking waves when they enter the shallow water. The water particles drag along the bottom and flatten their orbit when the wave energy contacts the ocean floor (Fig. 4.18 B). When the water depth is less than half the wavelength (D 1/2 L), transitional waves are produced.
When waves enter shallow water, they frequently try to align themselves parallel to the shore.A wave's energy release when it approaches a beach or coastline creates a current that travels parallel to the shoreline. A "longshore current" is the name given to this kind of current.
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In physics, power is __________.
a. how fast something does work
b. how much force something can apply
c. how strong something is
d. how much work something can do
Answers
Answer:
The answer is A
Explanation:
Answer:
A. How fast something works.
Explanation:
Power in physics is the rate at which work is done.
A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 8.0 m from the takeoff point.
If the kangaroo leaves the ground at a 22˚ angle, what is its takeoff speed?
What is its horizontal speed?
Answers
The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.
What is the sound's velocity?By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.
Briefing:The following equation relates the distance to the direction and initial velocity:
d = [v₀²sin2θ]/g, where θ – the angle of the jump.
Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62
v₀ = 10.65 m/s ( the take off speed).
The horizontal velocity equals:
vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s
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