Answer:
9m/s
Explanation:
Average velovity= (Initial velocity+Final velocity)/2
or A.V=(0+18)/2
or A.V= 9m/s
A sprinter starting from rest reaches final velocity of 18.0 mi/h. The average velocity of the sprinter is 9.0 mi/h.
Given that the sprinter starts from rest and reaches a final velocity of 18.0 mi/h, we can assume that the sprinter accelerates uniformly. Therefore, her average velocity would be the average of her initial velocity (0 mi/h) and her final velocity (18.0 mi/h).
Average velocity = (Initial velocity + Final velocity) / 2
Average velocity = (0 mi/h + 18.0 mi/h) / 2
Average velocity = 18.0 mi/h / 2
Average velocity = 9.0 mi/h
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Use this sentence: A large tray is filled with flour and a fan is turned on so that it blows wind across the top.
Which natural process is this modeling?
(1 point)
physical weathering (i picked this)
chemical weathering
erosion
deposition
Answer: Physical weathering
Explanation:
while flying to Tucson, Mr H's plane experiences mild turbulence, causing the coffee to oscillate back and forth in his cup 4 times each second. if the coffee waves have a wavelength of 0.1m, what is their velocity across the surface?
This question involves the concepts of wavelength, frequency, and velocity.
The velocity across the surface is "0.4 m/s".
Wave SpeedThe velocity of the wave can be found using the following formula:
[tex]v=f\lambda[/tex]
where,
v = velocity = ?f = frequency = 4 Hzλ = wavelength = 0.1 mTherefore,
v = (4 Hz)(0.1 m)
v = 0.4 m/s
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What are the first three harmonics of a note produced on a 0.31 m long violin string if the waves on this string have a speed of 274.4 M/s. what is the length of the pipe
what is the force in kN of work done is 1.2 ms moves through 120m
Answer:
work done = force x distance
1.2 = f x 120
1.2 = 120f
f = 0.01N
hope its helps!
Following extinction , when the conditioned response (cr) gains strength again , we say it has been
A. Generalized
B. Discriminated
C. Spontaneously recovered
D. Initially inhibited
Answer:
C. Spontaneously covered
Explanation:
A spring that can be assumed to be ideal hangs from a stand, as shown above. The spring constant, k, of an ideal spring is defined as the force per unit length and differs from one spring to another. It can be measured in both a static (motionless) and dynamic (in motion) mode A You wish to determine experimentally the spring constant k of the spring in a static (motionless) situation What additional, commonly available equipment would you need? ü What measurements would you make? m. How would k be determined from these measurements? 1 B. You wish to determine experimentally the spring constant k of the spring in a dynamic (moving) situation. What additional, commonly available equipment would you need? What measurements would you make C. Assume that the spring constant is determined to be 500 N/m A 20 kg mass is attached to the lower end of the spring and released from rest. Determine the frequency of oscillation of the mass
(a) The additional commonly available equipment you would need is stop watch.
(b) The measurement obtained with stop watch is period of oscillation. The period of oscillation can be used to determine angular speed and the angular speed is used to determine the spring constant.
(c) The frequency of oscillation of the mass is 0.8 Hz.
Value of spring constant from experimentThe value of spring constant can be determined experimentally with a mass and stop watch to record the period of oscillation.
How to calculate spring constantk = ω²m
where;
ω is angular speed = 2πf = 2π/Tm is massWith a known mass attached to the spring, the period of the oscillation can be determined using stop watch. The period of the oscillation can be used to determine the frequency and angular speed of the oscillation. The angular speed can be used to determine the spring constant, K.
Frequency of the oscillationω² = K/m
ω² = 500/20
ω² = 25
ω = √25
ω = 5 rad/s
ω = 2πf
f = ω/2π
f = 5/2π
f = 0.8 Hz
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_________________ usually have larger amplitudes and longer wavelengths.
A. Surface waves
B. Transverse waves
C. Compression waves
D. Longitudinal waves
Answer:
longitudinal wave
i guess
sry if its wrong
an immersion heater rated 2.0A,240V is used to boil water from temperature 52°c to hundred°c. if the mass of the water is 2.5kg, determine the time taken to boil water
Answer:
1.05 x 103s
Explanation:
The answer to the question is 1.05 x 103s
Kraig pulls on a rope attached to a box with a mass of 500kg to the right at an angle of 40 degrees to the horizontal with a force of 30 N for 150 seconds. The box does not move from its’ original position, determine the work done by Kraig.
Answer:
zero
Explanation:
The box does not move from its’ original position, so the displacement is zero, then the work done is zero.
Compare the gravitational acceleration on the following objects compared to the Sun using:
g(star)/g(Sun) =(M(star)/M(Sun) )/〖(R(star)/R(Sun) )〗^2
Object M(star)/M(Sun) R(star)/R(Sun) g(star)/g(Sun)
White dwarf
Neutron star
Star Betelgeuse
The gravitational acceleration of White dwarf compared to Sun is 13,675.86.
The gravitational acceleration of Neutron star compared to Sun is 6.79 x 10⁻²⁴.
The gravitational acceleration of Star Betelgeuse compared to Sun is 8.5 x 10¹⁰.
Mass of the planetsMass of sun = 2 x 10³⁰ kg
Mass of white dwarf = 2.765 x 10³⁰ kg
Mass of Neutron star = 5.5 x 10¹² kg
Mass of star Betelgeuse = 2.188 x 10³¹ kg
Radius of the planetsRadius of sun = 696,340 km
Radius of white dwarf = 7000 km
Radius of Neutron star = 11 km
Radius of star Betelgeuse = 617.1 x 10⁶ km
Gravitational acceleration of White dwarf compared to Sun[tex]\frac{g(star)}{g(sun)} = \frac{M(star)}{M(sun)} \times [\frac{R(sun)}{R(star)} ]^2\\\\\frac{g(star)}{g(sun)} = \frac{2.765 \times 10^{30}}{2\times 10^{30}} \times [\frac{696,340,000}{7,000,000} ]^2\\\\\frac{g(star)}{g(sun)} = 13,675.86[/tex]
Gravitational acceleration of Neutron star compared to Sun[tex]\frac{g(star)}{g(sun)} = \frac{M(star)}{M(sun)} \times [\frac{R(sun)}{R(star)} ]^2\\\\\frac{g(star)}{g(sun)} = \frac{5.5 \times 10^{12}}{2\times 10^{30}} \times [\frac{11,000}{7,000,000} ]^2\\\\\frac{g(star)}{g(sun)} = 6.79\times 10^{-24}[/tex]
Gravitational acceleration of Star Betelgeuse compared to Sun[tex]\frac{g(star)}{g(sun)} = \frac{M(star)}{M(sun)} \times [\frac{R(sun)}{R(star)} ]^2\\\\\frac{g(star)}{g(sun)} = \frac{2.188 \times 10^{31}}{2\times 10^{30}} \times [\frac{617.1 \times 10^9}{7,000,000} ]^2\\\\\frac{g(star)}{g(sun)} = 8.5\times 10 ^{10}[/tex]
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Consider a proton travelling due west at a velocity of 5×10^5m/s. Assuming that the rth magnetic field has a strength of 5x10^-5Tand is directed due south calculate li) the magnitude of the force on the proton (q= 1.6x10^-9C)
Answer:
Consider a proton travelling due west at a velocity of 5×10^5m/s. Assuming that the rth magnetic field has a strength of 5x10^-5Tand is directed due south calculate li) the magnitude of the force on the proton (q= 1.6x10^-9C)
Explanation:
A plane took from Chicago to Paris 8 h to finish a journey. If the distance of the journey was 6600 km, at what average speed did the plane travel
Answer:
825 km/hr
Explanation:
To find the average speed, you simply have to divide the distance by the time taken.
Distance travelled = 6600 km
Time Taken: 8 hours
Average speed = 6600 ÷ 8 or 6600/8 = 825 km/hr
Your final answer would be the plane travelled at an average speed of 825 kilometres per hour.
N2O is the chemical formula of a covalent compound used in the production of whipping cream. The elements that
make up this compound are nitrogen and oxygen.
What is the name of the second element in the chemical name of this compound?
N₂O: Nitrous oxide
oxygen
Please answer this question. Thank you and have a fruitful day.
#Up
The upward force is caused by floating equipments attached below in ship to make it float.
#Down
Weight or acceleration due to gravity
F=mg#Right
The drag force or friction from water surface#Left
Force of motor to go ahead
why a drop of spirit on the hand feels colder than a drop of water at the same temperature
Answer:
This is because spirit has a lower boiling point when compared to water
Explanation:
spirit has a lower boiling point when compared to water which means it has the capacity to pull more heat from your hand and also it can do this very fast. This is why our hand feels colder.
Write a script that depicts an employer meeting expectation and failing meeting expectations
Answer: On Monday, XX/XX, the XXXX you presented in our weekly review were not accurate and I’m worried that this reflected poorly on our team’s credibility. This could negatively impact senior leadership’s confidence in our team’s effectiveness at a time when headcount is already being scrutinized and potentially eliminated. Next time you present XXXX, my expectation is that everything will have been double or triple-checked in advance of the meeting so that all figures are reported accurately.
An undersea research chamber is spherical with an external diameter of 6.20 m. The mass of the chamber, when occupied, is 60400 kg. It is anchored to the sea bottom by a cable. The density of sea water is 1025 kg/m3. Calculate the following: (express your answers using appropriate mks units.)
(a) the buoyant force on the chamber
(b) the tension in the cable
Which of the following is correct when convection occurs in the atmosphere?
A
Cool air rises and warm air sinks.
B
Cool air sinks and warm air rises.
C
Cool and warm air sink.
D
Cool and warm air rise.
Answer:
Cool air sinks and warm air rises.
Explanation:
build three straight ramps on the stage one ramp should be nearly flat and another should be extremely steep the last ramp should have a steepness somewhere in between
Answer:
hope this helps
Explanation:
The ramps to be constructed are straight ramps. So, their lengths must be straight.
What is meant by an incline ?An incline or inclined plane is defined as a plane or flat surface that is tilted at a particular angle and the incline have one end higher than other.
Here,
The inclined plane or a ramp can be considered as a simple machine used for raising heavy objects through its steeper surface.
Three ramps are to be constructed that are having the configurations of straight run such that one of them should be constructed nearly flat.
The other one is to be constructed in a way that its slopping surface must be extremely steeper.
The last one is constructed such that the sloping surface have a steepness somewhere in between the other two.
Since the ramps to be constructed are straight ramps, their lengths must be straight.
Hence,
The ramps to be constructed are straight ramps. So, their lengths must be straight.
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Attaching the image here
1) If the red motorcycle and the blue motorcycle have the same speed but the red one has more mass, which one has more momentum? explain
Answer:
The blue motorcycle.
Explanation:
The red one, since it has more mass, meaning it is denser, would drag on less. Less mass equals more momentum, since there is less holding it down.
You want to build a generator to light a bulb. You have a fairly large permanent magnet, some wire, and a lightbulb. You may build it as follows. Wind the wire for about 200 turns into a coil of 15 cm radius. Tape up the coil and place it in the region between the poles of the magnet that produces a 0.10 T magnetic field. Connect a hand crank to the coil and rotate it at a rotational speed ω.
What is the required rotational speed ω to generate a peak voltage of 6 V?
The required rotational speed ω to generate a peak voltage of 6 V is 4.24 rad/s
The induced peak voltageThe induced peak voltage in the generator is given by ε = NABω where
N = number of turns of coil = 200, A = area of coil = πr² where r = radius of coil = 15 cm = 0.15 m, B = magnetic field strength = 0.10 T and ω = rotational speed of coilRotational speed
Making ω subject of the formula, we have
ω = ε/NAB
ω = ε/Nπr²B
Substituting the values of the variables into the equation, we have, given that ε = 6 V
ω = ε/Nπr²B
ω = 6 V/(200 turns × π(0.15 m)² × 0.10 T)
ω = 6 V/(200 turns × 0.0225π m² × 0.10 T)
ω = 6 V/(200 turns × 0.0225π m² × 0.10 T)
ω = 6 V/0.45π turns-m²T
ω = 6 V/1.4137 turns-m²T
ω = 4.244 rad/s
ω ≅ 4.24 rad/s
The required rotational speed ω to generate a peak voltage of 6 V is 4.24 rad/s
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which of these will NOT help reduce c02 levels in the atmosphere?
Answer:
the answer would be "using more heat" btw
Explanation:
What is the change in the momentum of a 1,600 kg car if its
velocity goes from 20 m/s to O m/s?
a -32,000 kg.m/s
b 32,000 kg-m/s
C 16,000 kg.m/s
d -20 m/s ka.m/s
Answer:
As Per Provided Information
Mass of car is 1600 Kg Initial velocity 20 m/sFinal velocity 0m/swe have been asked to determine the change in momentum .
Formula Used
[tex] \bf\Delta \: p = m \: \times \Delta \:v[/tex]
Put the given value we obtain
[tex] \rm \qquad \dashrightarrow \Delta \: p \: = 1600 \times (0 - 20) \\ \\ \\ \rm \qquad \dashrightarrow \Delta \: p \: = 1600 \times ( - 20) \\ \\ \\ \rm \qquad \dashrightarrow \Delta \: p \: = - 32000 \: kgm {s}^{ - 1} [/tex]
Hence,
Change in momentum is -32000Kgm/s .So, correct option is (a) -32000 Kgm/s.
The change in the momentum of a 1,600 kg car if its velocity goes from 20 m/s to O m/s is -32000 Kg-m/s.
What is Momentum?The meaning of MOMENTUM is a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity. Momentum is vector quantity.
Given in the question
Mass of car is 1600 Kg
Initial velocity 20 m/s
Final velocity 0 m/s
we have been asked to determine the change in momentum
Momentum = mass*(change in velocity)
= 1600(0 - 20)
= -32000 Kg-m/s
The change in the momentum of a 1,600 kg car if its velocity goes from 20 m/s to O m/s is -32000 Kg-m/s.
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A 6.0 x10^-2 kg tennis ball moves at a velocity of 12 m/s. The ball is struck by a racket, causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in the ball’s momentum?
Δp = m(v₂-v₁)
v₁ = 12 m/s
v₂ opposite direction = - (negative sign) = -18 m/s
Δp = 6.10⁻² (-18-12)
Δp = -1.8 Ns
What will happen to this force if the distance between the charges is doubled and the -4μC is cut in half ? Use proportional reasoning to find the answer and then check by changing and moving the charges.
Answer: MIS huevos
Explanation:
my sources
Describe how to make an electromagnet. Use the following words and phrases:
Power supply, coil of wire, current, iron core
Required items:
battery a coil of wireiron coreElectromagnet can be created by wrapping a coil of wire on top of the iron core and passing an alternating current through it with the help of power supply.
the magnetic field will be constantly changing.Answer:
Explanation:
Unlike permanent magnet, electromagnet require a power supply to work. The power supply drives an electric current through coil of wire wrapped around an iron core.
The moon remains in Earth's orbit because of Earth's gravitational pull on the moon. In return, the moon exerts a gravitational pull on Earth. The mass of the moon is 0.07346 x 1024 kg and Earth's mass is 5.9724 x 1024 kg. How does the gravitational pull of Earth on the moon compare to the moon's gravitational pull on Earth?
A. Earth pulls more strongly on the moon.
B. The moon pulls more strongly on Earth.
C. The moon and Earth pull on each other with equal force.
D. There is not enough information to answer this question.
Given what we know, we can confirm that the Earth pulls more strongly on the moon, option A is correct.
Why does the Earth pull more strongly?This has to do with the relationship between the mass of an object and its gravitational pull. These values are directly proportional, the more massive an object is, the stronger the gravitational pull that object exhibits. The moon does pull on the Earth as well, however, due to its smaller mass, it does not pull as strongly as the Earth on the moon.
Therefore, we can confirm that the Earth pulls more strongly on the moon, which means that option A is the correct choice for this question.
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A ballon is rubbed against a sweater. Which of the following describes the result of this interaction?
Answer:
static could form and The balloon becomes positively charged
Explanation:
Science
When light is incident through the focal point, and then strikes a mirror, ___ the light will reflect parallel to the principal axis the light will reflect back through the focal point the light will not reflect at all
When light is incident through the focal point and allow to strike a mirror, the light will be reflected back parallel to the principal axis.
What is reflection of light?The reflection of light occurs when all the incident light falls back when it hit a plane surface like mirror. In this process the light will be thrown back by the mirror without absorbing it.
Reflection of light when it strikes a mirrorWhen light is incident through the focal point and allow to strike a mirror, the light will be reflected back parallel to the principal axis.
Thus, the incident light will reflect parallel to the principal axis.
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6. How much heat is absorbed by a persons hand if 100 grams of liquid water at 100°C is poured on his hand? (Assume the final temperature of the water will be normal body temperature of 37°C)
The heat absorbed by a persons hand is 26,359.2 J.
Heat absorbedThe quantity of heat absorbed by the persons hand is heat gained or transferred from the hot water to cold hand. This is based on the principle of conservation of energy.
The quantity of heat absorbed is calculated as follows;
Q = mcΔθ
where;
Q is the quantity of heat absorbedm is mass of the liquidΔθ is change in temperatureQ = 100 x 4.184 x (100 - 37)
Q = 26,359.2 J
Thus, the heat absorbed by a persons hand is 26,359.2 J.
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