Answer:
8.89 m/s² west
Explanation:
Assume east is +x. Given:
v₀ = 120 m/s
v = 0 m/s
t = 13.5 s
Find: a
v = at + v₀
0 m/s = a (13.5 s) + 120 m/s
a = -8.89 m/s²
a = 8.89 m/s² west
Question 3. Which of these best describes the field of engineering? *
O A. It is a tool or process designed to solve a problem.
B. It is the use of science and math to solve problems.
C. It is an area of study that relates to space exploration.
D. It is an area of study that relates to nonliving materials.
Please help me:)
A rigid container holds 0.30g of hydrogen gas.
Part A) How much heat is needed to change the temperature of the gas from 50 K to 100 K?
Express your answer to two significant figures and include the appropriate units.
Q= _______
Part B) How much heat is needed to change the temperature of the gas from 250 K to 300 K?
Express your answer to two significant figures and include the appropriate units.
Q=_____
Part C) How much heat is needed to change the temperature of the gas from 2250 K to 2300 K?
Express your answer to two significant figures and include the appropriate units.
Q=_____
Answer:
Part A: [tex]\mathbf{Q =94 \ J}[/tex] to two significant figures
Part B: [tex]\mathbf{Q =160 \ J}[/tex] to two significant figures
Part C: [tex]\mathbf{Q =220 \ J}[/tex] to two significant figures
Explanation:
Given that :
mass of the hydrogen = 0.30 g
the molar mass of hydrogen gas molecule = 2 g/mol
we all know that:
number of moles = mass/molar mass
number of moles = 0.30 g /2 g/mol
number of moles = 0.15 mol
For low temperature between the range of 50 K to 100 K, the specific heat at constant volume for a diatomic gas molecule = [tex]C_v=\dfrac{3}{2}R[/tex]
For Part A:
[tex]Q = mC_v\Delta T[/tex]
[tex]Q= 0.15 \ mol (\dfrac{3}{2})(8.314 \ J/mole.K )(100-50)K[/tex]
[tex]Q= 0.15 \times (\dfrac{3}{2}) \times (8.314 \ J )\times (50)[/tex]
[tex]Q=93.5325 \ J[/tex]
[tex]\mathbf{Q =94 \ J}[/tex] to two significant figures
Part B. For hot temperature, [tex]C_v=\dfrac{5}{2}R[/tex]
[tex]Q = mC_v\Delta T[/tex]
[tex]Q= 0.15 \ mol (\dfrac{5}{2})(8.314 \ J/mole.K )(300-250)K[/tex]
[tex]Q= 0.15 \times (\dfrac{5}{2}) \times (8.314 \ J )\times (50)[/tex]
[tex]Q=155.8875 \ J[/tex]
[tex]\mathbf{Q =160 \ J}[/tex] to two significant figures
Part C. For an extremely hot temperature, [tex]C_v=\dfrac{7}{2}R[/tex]
[tex]Q = mC_v\Delta T[/tex]
[tex]Q= 0.15 \ mol (\dfrac{7}{2})(8.314 \ J/mole.K )(2300-2250)K[/tex]
[tex]Q= 0.15 \times (\dfrac{7}{2}) \times (8.314 \ J )\times (50)[/tex]
[tex]Q=218.2425 \ J[/tex]
[tex]\mathbf{Q =220 \ J}[/tex] to two significant figures
Part A) Heat needed to change the temperature of the gas from 50 K to 100 K is 94J.
Part B) Heat needed to change the temperature of the gas from 250 K to 300 K is 160J.
Part C) Heat needed to change the temperature of the gas from 2250 K to 2300 K is 220J.
What is heat?The increment in temperature adds up the thermal energy into the object. This energy is Heat energy.
Given is the mass of the hydrogen = 0.30 g and the molar mass of hydrogen gas molecule = 2 g/mol
Then, number of moles = mass/molar mass
number of moles = 0.30 g /2 g/mol = 0.15 mol
Part A) For low temperature between the range of 50 K to 100 K, the specific heat at constant volume for a diatomic gas molecule Cv =3/2R
Q =m Cv ΔT
Q = 0.15 mol x 3/2 x 8.314 x (100 - 50)
Q = 93.5325 Joules.
Q = 94 J to two significant figures.
Part B) For hot temperature, Cv = 5/2 R
Heat needed, Q =m Cv ΔT
Q = 0.15 mol x 5/2 x 8.314 x (300 - 250)
Q = 155.8875Joules.
Q = 160 J to two significant figures.
Part C) In case of extremely hot temperature, Cv =7/2R
Heat needed to change the temperature from 2250 K to 2300 K
Q = 0.15 mol x 7/2 x 8.314 x (2300 - 2250)
Q = 218.2425 J
Q = 220J
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How fast is the flash? Your final answer should be in m/s and you should cite your reference.
Answer: as fast as lightning
300,000,000 meters per second
Lightning is the flash of light that occurs when charge separation occurs. Like other forms of light, the light emitted from the lightning travels near the speed of light.
A 50 mm diameter thin walled pipe is covered with an insulation layer with thicknessof 25mm and thermal conductivity of0.075W/mK. The inner pipe carries a superheated vapor at atmospheric pressure. The steam temperature entering the pipe is 120°Candthe air temperature is 20°C. The convection heat transfer coefficient on top of the insulation layer is 15W/m(K. If the velocity of the steam is 10 m/s, at what point along the pipe the steam starts to condense?
Answer:
The steam will start to condense at 6.6 mm into the pipe
Explanation:
The volume flow rate =π×(50/1000)²/4×10 = 0.0196 m³/s
The specific volume of the steam = 1.769 m³/kg
Therefore;
The mass flow rate = 0.0196/1.769 = 0.011099 kg/s
The resistance of the insulation material = ln(0.075/0.05)/(2×π×0.075) = 0.860 K/W
The resistance of the outside film of the insulator = 1/(15×2×π×0.075×1) = 0.14147 K/W
The total resistance = 0.14147 + 0.860 = 1.00147 K/W
1/(UA) = 1.00147 K/W
A = 2×π×0.05×1
1/U = 0.3146
U = 3.178 W/m² K
We have;
T(x) = T₀ + (Tin - T₀) exp(-UπDx/mcp)
Therefore, when T(x) = 100°C, we have;
100 = 20 + (120 - 20)exp(-3.178×π×0.05x/(0.011099 × 1.33))
Solving, we get
x = 6.597× 10⁻³ m ≈ 6.6 mm
Therefore, the steam will start to condense at 10 mm into the pipe.
A woman on a bridge 93.7 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 4.94 m more to travel before passing under the bridge. The stone hits the water 1.53 m in front of the raft. Find the speed of the raft.
Answer:
0.779m/s
Explanation:
A woman on a bridge 93.7m high sights a raft floating at a constant speed
She drops a stone from rest in an attempt to hit the raft
The stone is released when the raft had 4.94m to travel before passing under the bridge
The stone hits the water 1.53 m in front of the raft
The first step is to calculate the distance
= 4.94 m-1.53 m
= 3.41m
The time can be calculated as follows
= √2(93.7)/9.8
= √187.4/9.8
= √19.12244
= 4.373 secs
Therefore the speed of the raft can be calculated as follows
Speed= 3.41/4.373
= 0.779m/s
Hence the speed of the raft is 0.779m/s
A ball is thrown straight up and passes point B (at a height of 56.8 m above its starting point O) in 5.8 s. What was its initial speed? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/s
Answer:
38.2 m/s
Explanation:
Given:
Δy = 56.8 m
a = -9.8 m/s²
t = 5.8 s
Find: v₀
Δy = v₀ t + ½ at²
56.8 m = v₀ (5.8 s) + ½ (-9.8 m/s²) (5.8 s)²
v₀ ≈ 38.2 m/s
does the change of height affect the value of g?
Answer:
Yes, change of height affect the g.
Explanation:
As gravity is indirectly proportion to height. So when,height increases gravity decrease and when the height decrease gravity increase.
A bike moves 50 meters in 5
seconds. Calculate the speed
of the bike.
Answer:
speed = distance ÷ time.
speed=50÷ 5
=10m/s
A bike moves 50 meters in 5 seconds, then the speed of the bike would be 10 m/s.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.
As given in the problem a bike moves 50 meters in 5 seconds. This means the total distance covered by the bike is 50 meters, and the total time taken by the bike is 5 seconds.
The total distance covered by the bike = 50 meters
The total time taken to cover the 5 meters = 5 seconds
speed = the total distance covered by the bike/the total time
= 50 meters/5 seconds
= 10 m/s
Thus, the speed of the bike comes out to be 10 m/s.
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Bryan Allen pedaled a human-powered aircraft across the English channel from the cliffs of Dover to Cap Gris-Nez on June 12, 1979. He flew for 169 minutes at an average velocity of 3.53 m/s in a direction 45.0∘ degrees south of east. Allen encountered a headwind averaging 2.00 m/s almost precisely in the opposite direction of his motion relative to the earth. What was his average velocity relative to the air?
Answer:
The answer is "[tex]5.53 \ \frac{m}{s}[/tex]"
Explanation:
apply the formula for calculating the average velocity to the relative air
[tex]V_{PG} =V_{PA}+V_{AG}[/tex]
[tex]\Rightarrow V_{PA} = V_{PG} -V_{AG}[/tex]
Given value:
[tex]V_{AG} = -2 \ \frac{m}{s}[/tex]
[tex]V_{PG} =3.53[/tex]
[tex]\Rightarrow V_{PA} = 3.53 - (-2) \\\\\Rightarrow V_{PA} = 3.53 +2 \\\\\Rightarrow V_{PA} = 5.53 \\\\[/tex]
The final answer is "[tex]5.53 \ \frac{m}{s}[/tex]" in the south-east direction.
An archer fires an arrow straight up into the air with a speed vo = 29 m/s. Neglect air resistance.Required:a. FInd the Maximum height h reached by the arrow, in meters.b. What is the mass of the car plus its occupants in kg?
Answer:
42.9 m.
Explanation:
The following data were obtained from the question:
Initial velocity (v₀) = 29 m/s
Acceleration due to gravity (g) = 9.8m/s²
Maximum height (h) =.?
The maximum height reached can be obtained by using the following formula:
H = v₀² /2g
Where:
H is the maximum height reached.
v₀ is the initial velocity.
g is the acceleration due to gravity.
H = v₀² /2g
H = (29)² / (2 × 9.8)
H = 841 / 19.6
H = 42.9 m
Therefore, the maximum height reached by the arrow is 42.9 m
Use the mass and volume data to calculate the density of liquid propane to the nearest hundredth. Mass of propane = 4,300 g Volume of propane = 10,000 mL The density of liquid propane is g/mL
Answer:
0.43
Explanation:
because i said it was
Answer:
0.43
Explanation:
Because he said it was (and yes it is right)
A bird flies 10 miles south, turns and flies 15 miles east. What distance did it fly.
Answer:
wouldn't it be 25 miles?? yeah
Explanation:
A 14 g sample of neon gas has 1200 J of thermal energy. Estimate the average speed of a neon atom.
Answer:
The average speed of a neon atom is 414.04 m/s
Explanation:
Given;
energy of the neon gas, E = 1200 J
mass of the neon gas, m = 14 g = 0.014 kg
The speed of the neon atom is given by Maxwell-Boltzmann;
E = ¹/₂mv²
where;
v is the average speed of the neon atom
1200 = ¹/₂(0.014)v²
2 x 1200 = 0.014v²
2400 = 0.014v²
v² = 2400 / 0.014
v² = 171428.57
v = √ 171428.57
v = 414.04 m/s
Therefore, the average speed of a neon atom is 414.04 m/s
The average speed of a neon atom will be 414.04 m/s.
What is the average speed?The total distance traveled by an object divided by the total time taken is the average speed.
The average speed of an object indicates the pace at which it will traverse a distance. The metric unit of speed is the meter per second.
The given data in the problem is;
E is the energy of the neon gas, = 1200 J
m is the mass of the neon gas= 14 g = 0.014 kg
v is the speed of the neon atom=?
From the Maxwell-Boltzmann equation;
[tex]\rm E= \frac{1}{2} mv^2 \\\\ v=\sqrt{\frac{2E}{m} } \\\\ v=\sqrt{\frac{2 \times 1200 }{0.014} } \\\\ v= 414.04 \ m/s[/tex]
Hence the average speed of a neon atom will be 414.04 m/s.
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A clever physics student is able to sneak a scale on a popular ride at an amusement park. Before the ride begins to move, the scale reads 700 N for the student's weight. As the ride lifts, it initially accelerates upward at 3 m/s2. At the top, the riders are held in suspense before the gondola is allowed to free fall downward with acceleration equal to g. What should the scale read for the student's apparent weight during the lift and the fall
Answer:
(a) the student's apparent weight during the lift is 914.2 N
(b) the student's apparent weight during the fall is 0
Explanation:
Given;
student weight, W = 700 N
upward acceleration, a = 3 m/s²
Apply Newton's second law of motion;
The reading on the scale = student's apparent weight
(a) during the lift
R = W + F
R = W + ma
where;
m is mass of the student = 700 / 9.8 = 71.4 kg
R = 700 + 71.4(3)
R = 700 + 214.2 N
R = 914.2 N
(b) during the fall
R = W - ma
R = mg - ma
R = m(g-a)
here, a = g
R = m(g - g)
R = m(0)
R = 0
Thus, during the free fall the student experiences weightlessness or zero apparent weight.
Which of the following is not the one of the influencing factors when it comes to body type
Answer:
Nutritional intake:)Hope this helps.
Explanation:
Which property of metals allows aluminum to be flattened into thin sheets of aluminum foil? shininess malleability brittleness hardness
Malleability
Knowledge Enhancer★ Malleability: The property which allows the metal to be hammered into thin sheets is called malleability.
★ Brittleness: The property due to which non-metals break down on hammering is called brittleness .
★ Ductility: The property which allows the metal to be drawn into wires is called dutility.
Answer:
The answer to this question is malleability.
The angle of deflection shows the amount of electric force on each balloon. A greater force causes the balloon to deflect to a greater angle. Since the two balloons are deflected to the same angle, we know that the force on each balloon must be the same. Why do you think the balloons have the same amount of force exerted on them?
Answer:
Hello the options to your question is missing attached below are the missing options
Electrical forces are symmetrical, The electric repulsion of the Balloons is equal because electric forces between two objects are always symmetricalThe electric forces are equal in this case because both balloons had the same amount of electric chargeAnswer :
Electrical forces are symmetrical, The electric repulsion of the Balloons is equal because electric forces between two objects are always symmetrical
Explanation:
The Balloons have the same amount of force exerted on them, because Electrical forces are symmetrical, The electric repulsion of the Balloons is equal because electric forces between two objects are always symmetrical, therefore the two Balloons are deflected to the same angle
At 1.70 atm, a sample of gas takes up 4.25L. If the pressure in the gas is increased to 2.40 atm, what will the new volume be?
Answer:
This question is an example of Boyle's gas law which states that the pressure of a given mass of a gas is inversely proportional to its volume at a constant temperature. The formula for this gas law is:
P1·V1 = P2·V2
P1 = initial pressure = 1.7 atm
V1 = initial volume = 4.25 L
P2 = final pressure = 2.4 atm
V2 = final volume = ?
Rearrange the formula to isolate V2. Substitute the known data and solve.
V2 = P1·V1/P2
V2 = 1.7 atm·4.25 L/2.4 atm = 3.0 L to two significant figures
The new volume will be ~3.0 L.
Explanation:
A ferry is travelling at 10 m/s relative to the river towards the south. The river is flowing at 2 m/s relative to
the riverbank towards the south. If a passenger on the ferry walks towards the rear of the ferry (north) at 1.0
m/s, what is their velocity relative to the riverbank?
Answer:
11 m/s south
Explanation:
The velocity of the passenger relative to the river bank is equal to the velocity of the passenger relative to the ferry, plus the velocity of the ferry relative to the river, plus the velocity of the river relative to the river bank.
v_passenger,bank = v_passenger,ferry + v_ferry,river + v_river,bank
If we take north to be positive and south to be negative:
v = 1.0 m/s + (-10 m/s) + (-2 m/s)
v = -11 m/s
v = 11 m/s south
Which statement illustrates how engineering has influenced society?
Answer: A. New, high-tech materials are used to make prosthetic limbs for people who need them
Explanation:
Engineering is an immensely important science to us as humans for through its development of tools, machines, engines and structures, human lives have been made better in just about every field.
One of these fields is the medical field. In the past people who lost limbs could say good bye to a normal life or at least a semblance of one but now, due to advancements in Engineering, high-tech materials can now be used to make prosthetic limbs for people who need them.
Select all that apply.
A chemist is likely to do which of the following?
analyze the ingredients in ice cream
determine why planets orbit the Sun
determine how to separate gasoline from other substances in petroleum
determine the force necessary to push a button through a button hole
Answer:
Determine how to separate gasoline from other substances in petroleum
why did the chicken cross the road?
Answer:
To go to heaven
Explanation:
The chicken was on a dark path
Answer:
to get to the other side.
Explanation:
wanna rethink ur childhood? this joke is actually dark. the chicken was suicidal or depresssed so it crossed the road and got ran over by a car. so "to get to the other side" means the afterlife, or, heaven.
yea found this out like a week ago :/
(URGENT) A ball rolls off a ledge. Its velocity is 7.70m/s in a horizontal direction. It falls on the floor 1.60m below the ledge. What is the horizontal distance that it travels while in the air?
Answer:
the horizontal distance is 4.355 meters
Explanation:
The computation of the horizontal distance while travelling in the air is shown below:
Data provided in the question is as follows
Velocity = u = 7.70 m/s
H = 1.60 m
R = horizontal direction
Based on the above information
As we know that
R = u × time
where,
Time = [tex]\sqrt{\frac{2H}{g} }[/tex]
So,
= [tex]7.70\times \sqrt{\frac{2\times 1.60}{10} }[/tex]
= 4.355 meters
hence, the horizontal distance is 4.355 meters
4. True or false. When measuring a liquid ingredient, the measuring cup should be held up so the mark on
the cup for the desired amount is at eye level.
Foods class
Coulomb's Law: Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F F due to the other. With time, charge gradually diminishes on both spheres by leaking off. When each of the spheres has lost half its initial charge, what will be the magnitude of the electrostatic force on each one?
Answer:
The magnitude of electrostatic force on each charge is quarter of the magnitude of initial electrostatic force. ( ¹/₄ F)
Explanation:
The electrostatic force between two charges is given by Coulomb's law;
[tex]F = \frac{kQ_1Q_2}{r^2}[/tex]
where;
Q₁ and Q₂ are the magnitude of the charges
r is the distance between the charges
k is Coulomb's constant
Since the charges are identical;
Q₁ = Q
Q₂ = Q
the electrostatic force experienced by each charge is given by;
[tex]F = \frac{kQ^2}{r^2}[/tex]
When each of the spheres has lost half of its initial charge;
Q₁ = Q/2
Q₂ = Q/2
[tex]F_2 = \frac{k(Q/2)(Q/2)}{r^2}\\\\ F_2 = \frac{k(Q)(Q)}{4r^2}\\\\F_2 = \frac{1}{4} (\frac{kQ^2}{r^2} )\\\\F_2 = \frac{1}{4} (F)[/tex]
Therefore, the magnitude of electrostatic force on each charge is quarter of the magnitude of initial electrostatic force.
A naughty girl throws a stone off a cliff with an initial horizontal speed of 5.4 m/s. The stone was in the air for 1.4 seconds before hitting the ground. How high is the chur?
(Hint: Create a table with X-component and y-component then list your number symbol under the correct column.)
Answer:
9.6 m
Explanation:
h = y_0 t + 1/2 a t^2 = 1/2 (9.81) (1.4)^2 = 9.6 m.
How does an atom become an anion?
A. It loses one or more protons to another atom to become negatively charged.
B. It gains one or more protons from another atom to become positively charged.
C. It gains one or more electrons from another atom to become negatively charged.
D. It loses one or more electrons to another atom to become positively charged.
Answer:
C. It gains one or more electrons from another atom to become negatively charged.
Explanation: When it gains electrons it becomes negatively charged and is called an anion. When it loses electron(s) it becomes positively charged and is called a cation.
Hope this helps
Plz mark brainleist
An atom becomes an anion when it gains one or more electrons from another atom, resulting in a net negative charge. This process occurs through the formation of chemical bonds, typically in ionic compounds.
An atom's position in the periodic table affects how likely it is to gain electrons. Atoms in nonmetals and other elements on the right side of the periodic table have a stronger attraction for electrons and are more prone to undergo anion formation.
The extra electrons fill the highest energy level, creating a stable arrangement of electrons like that of a noble gas. Anions contribute to the overall charge balance of compounds and are crucial in a number of chemical processes.
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Which expression represents the sum of 8 and twice a number
8+n
8+2n
8×2n
2×(8+n)
Answer:
8 + 2 n (second expression listed)
Explanation:
Since we don't know the number, we represent it with a letter (n).
Twice a number (two times that number) will therefore be: 2 n.
and the addition (sum) of 8 to such will lead to 8 + 2 n
The sum of 8 and twice a number is : 8 + 2 n
There are positive negative, and neutrally charged particles in atoms. What is the name of the positively charged particle?
O A electron
OB. positron
0 c neutron
D. proton
Answer:
Positively charged particles in atoms are D. Protons
Explanation:
Negative = Electrons
Neutral = Neutron
Positive = Proton
Find the order of magnitude of your age in seconds. 1)10^3 s 2)10^6 s 3)10^9 s 4)10^12 s
B) Estimate the number of times your heart beats in a month.
1)10^2 2)10^4 3)10^6 4)10^8
C) Estimate the number of human heart beats in an average lifetime.
1)10^5 2)10^7 3)10^9 4)10^11
Answer:
A) 3, B) 3, C) 3
Explanation:
The order of magnitude is a very useful unit for when you do not have a precision in the measurement, the way to find it is to take the number to scientific notation and then change the whole part to 101 if it is greater than or equal to five or 10 or less than five
A) take my age to seconds
for example if I am 25 years old.
I take the years to seconds
age = 20 years (365 day / year) (24 h / 1 day) (3600 s / 1h)
age = 630720000 s
we carry scientific notation
age = 6.3072 10⁸ s
as the integer greater than five we change it by 10¹
age = 10⁹s
The correct answer is 3
B) The number of beats per minute approximately 80 beats in a month we have
# beats = 80 beats /min (60min / 1h) (24 h / 1 day) (30 day / 1 month)
# _beats = 3456000 beats / month
#_beats = 3,456 10⁶ beats / month
as the integer is less than five we change it by 10⁰
#_beats = 10⁶
the correct answer is 3
C) the number of heartbeats in life
suppose a life expectancy of 80 years
#_beats_total = 80 pulse /min (60min / 1h) (24 h / 1day) (365 day / year) 80 year
#_total_beats = 3 363 840 000
#_beats_total = 3.36384 10⁹
as the integer is less than five we change it by 10⁰
#_beats_total = 10⁹
the correct answer is 3
