Answer:
The answer is 10
Explanation:20 x 10 = 200
A spherical balloon is being inflated and the radius of theballoon is increasing at a rate of 2 cm/s.(A) Express the radius (r) of the balloon as a function of thetime (t).(B) If V is the volume of the balloon as a function of theradius, find Vor and interpret it.
Answer:
A.) r = 2t
B.) V = 33.5t^3
Explanation:
Given that a spherical balloon is being inflated and the radius of the balloon is increasing at a rate of 2 cm/s
A) Express the radius (r) of the balloon as a function of the time (t).
Since the rate = 2 cm/s that is,
Rate = radius/ time
Therefore,
2 = r/t
Make r the subject of formula
r = 2t
(B) If V is the volume of the balloon as a function of the radius, find V or and interpret it.
Let assume that the balloon is spherical. Volume of a sphere is;
V = 4/3πr^3
Substitute r = 2t into the formula
V = 4/3π(2t)^3
V = 4/3π × 8t^3
V = 32/3 × πt^3
V = 33.5t^3
A fast Humvee drove from desert A to desert B. For the first 12
hours, it travelled at an average speed of 185 km/h. For the
next 13 hours, it travelled at an average speed of 160 km/h.
What was the average speed of the whole journey?
km/h
Answer: 172
Explanation: Because yeah
How should you behave while performing laboratory experiments?
Explanation:
Always behave responsibly in the laboratory. Do not run around or play practical jokes. Always check the safety data of any chemicals you are going to use. Never smell, taste or touch chemicals unless instructed to do so.
a tungsten and coil has a resistance of 12 ohm at 15 degree celsius is the temperature coefficient of resistance of tungsten is 0.004 calculate the equal resistance at 80 degree Celsius
Answer:
The resistance of the tungsten coil at 80 degrees Celsius is 15.12 ohm
Explanation:
The given parameters are;
The resistance of the tungsten coil at 15 degrees Celsius = 12 ohm
The temperature coefficient of resistance of tungsten = 0.004/°C
The resistance of the tungsten coil at 80 degrees Celsius is found using the following relation;
R₂ = R₁·[1 + α·(t₂ - t₁)]
Where;
R₁ = The resistance at the initial temperature = 12 ohm
R₂ = The resistance of tungsten at the final temperature
t₁ = The initial temperature = 15 degrees Celsius
t₂ = The final temperature = 80 degrees Celsius
α = temperature coefficient of resistance of tungsten = 0.004/°C
Therefore, we have;
R₂ = 12×[1 + 0.004×(80 - 15)] = 15.12 ohm
The resistance of the tungsten coil at 80 degrees Celsius = 15.12 ohm.
an elastic material of length 3m is to be stretched to produce an extension three times it's original length. Calculate the force required to produce the extension if the force constant of the material is 982.3 Newton per metre
Answer:
F = 8840.7 N
Explanation:
The parameters given are:
Length L = 3 metres
Extension e = 3 × 3 = 9m
Force constant K = 982.3 Newton per metre
From Hook's law,
Provided the elastic limit is not extended, the extension is directly proportional to the force applied.
That is,
F = Ke
Substitute all the parameters into the formula
F = 982.3 × 9
F = 8840.7 N
A rock is thrown vertically upward at an initial velocity of 70 m/s. What is the approximate acceleration of the rock when it reaches its maximum height (assume upward is the positive y direction)?
Answer:
Zero.
Explanation:
Given that a rock is thrown vertically upward at an initial velocity of 70 m/s. What is the approximate acceleration of the rock when it reaches its maximum height
(assume upward is the positive y direction)?
Since the reached the maximum height, the final velocity V will be equal to zero.
Using the first equation of motion to find the time.
And since it is a vertical direction, and not horizontal, the acceleration a will be equal to zero.
The burning of fossil fuels has added pollutants that contain sulfur atoms to the air. These pollutants have contributed to which of the following
A. Drought
B. temperature inversions
C. Tornadoes
D. Acid rain
if you ran 3.1 miles in 0.5 hours. what was your speed
Answer:
speed= 6.2 m/hrExplanation:
distance= 3.1 mile
time=0.5 hours
s=d/t
s=3.1/0.5
speed= 6.2 m/hr
If you run for a distance of 3.1 miles in 0.5 hours, then the speed in miles per hour will be 6.2 m/hr.
What is Speed?A scalar quantity in kinematics and common usage, an object's speed is the size of the change in its position over time or the amount of change in its position per unit of time.
As the duration of the time interval approaches zero, the instantaneous speed is the maximum limit of the average speed. The distance traveled divided by the duration of the interval represents the average speed of an object over a period of time.
Given information,
Distance covered, d = 3.1 miles
Time taken, t = 0.5 hours
Speed = [tex]Distance/time[/tex]
Speed = 3.1/0.5
Speed = 6.2 m/hr
Therefore, the speed while running is 6.2 m/hr.
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The steeper the slope of a line, the _______ the object was moving
Answer:
"Faster" is most likely the answer, I'm not 100% sure though
1. In a biology experiment the number of yeast cells is determined after 24 hours of growth at
different temperatures.
a) Identify the independent and dependent variables in the experiment.
Answer:
In a biology experiment the number of yeast cells is determined after 24 hours of culture at different temperatures. a) Identify the independent and dependent variables in the experiment. b) Draw the graph of the
Explanation:
The mercury manometer of fig. P2.57 indicates a differential reading of 0.30 m when the pressure in pipe a is 30-mm hg vacuum. Determine the pressure in pipe
b.
Answer:
The pressure in pipe b is 33.4 kpa.
Explanation:
Given that,
Pressure in pipe a = 30 mm hg vacuum
Differential reading = 0.30 m
We need to calculate the pressure in pipe b
Using diagram
[tex]P_{B}+W_{oil}(h_{1}+h_{2})-W_{Hg}(h_{2})-W_{H_{O}}(h_{1})=P_{A}[/tex]
Where, P = pressure
W= specific weight
Put the value into the formula
[tex]P_{B}+W_{oil}(0.15+0.30)-W_{Hg}(0.3)-W_{H_{2}O}(0.15)=-W_{Hg}(0.030)[/tex]
Put the value of specific weight
[tex]P_{B}=-(133)\times(0.030)-(8.95)\times(0.45)+133\times(0.3)+9.80\times0.15[/tex]
[tex]P_{B}=33.4\ kPa[/tex]
Hence, The pressure in pipe b is 33.4 kpa.
3. Briefly explain why measured data
must have units.
Answer:
because it helps data to be meaningful
Explanation:
I took a test and and got 100%
Calculate the change in momentum of a 45 kg runner who starts out at 1 m/s and speeds up to 3 m/s. Which anser choice is correct 90 kg⋅m/s 45 kg⋅m/s 135 kg⋅m/s 0 kg⋅m/s
momentum can also be defined in terms of newton second
that is P=F.V
now v =vf-vi
v=3 m/s-1m/s=2 m/s
now F=W=45 kg
therefore
change in momentum=F.v
P=45*2=90 kg.m/s
What is non-science? Philosophy or art.
Answer:
both
Explanation:
because science is not included in both of them
Calculate the change in time for each quarter of the track. Record the change in time in Table E of your Student Guide. The change in time for the first quarter is seconds. The change in time for the second quarter is seconds. The change in time for the third quarter is seconds. The change in time for the fourth quarter is seconds.
Answer:
Answer:first 1.39
second 0.78
third 0.64
fourth 0.54
Explanation:just did it
Explanation:
Answer:
this is it
Explanation:
what do you mean by 100W is written on an electric bulb?
Answer:
100 watt
Watt is a unit of power, for the light bulb its produces or consumes 100 watts of power
Answer:
100w means the power consumed by the electric bulb
Can someone answer these for me, i will give you brainliest if it is correct
Answer:
Explanation:
a. time 0 = 0
time 5 = 5
c. all values are equilvalents.
b. slope is x = y
Calculate the average speed of Terri's trip.
Answer:
please provide more information about the question so that I can help you
How can shoe and tire marks be preserved in mud?
es )
A)
casting
B)
dusting
fluorescence
D)
printing
If Justin races his Chevy S-10 down highway 37 north for 2,560 meters in 60 seconds, what is
his velocity? a. Draw Justin's trip. What are his distance and displacement? b. The Chevy S-10
started rounding at 10 meters per hour. What is the acceleration at 30 seconds on the
highway? c. The S-10 has a force of 30 N. What is the mass of the car?
Answer:
A.) 42.7 m/s
B.) 0.33 m/s^2
C.) 90 kg
Explanation:
A.) If Justin races his Chevy S-10 down highway 37 north for 2,560 meters in 60 seconds, what is his velocity?
Velocity = displacement/time
Velocity = 2560/60
Velocity = 42.67 m/s
B.) The Chevy S-10 started rounding at 10 meters per hour. What is the acceleration at 30 seconds on the highway?
Acceleration = velocity/time
Acceleration = 10/30
Acceleration = 0.33 m/s^2
C.) The S-10 has a force of 30 N. What is the mass of the car?
Force = mass × acceleration
30 = mass × 0.33
Mass = 30/ 0.33
Mass = 90 kg
what volume will a sample of copper 98.2 g occupy? the density of copper is 8.96 g/mL
Answer:
Density=mass/volume.
8.96=98.2/volume.
volume=98.2/8.96=10.95982143 ~ 11cm^3.
The volume of a sample of copper of 98.2 g would be 10.95 ml if the density of copper is 8.96 g/mL.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
Due to their superior electrical and thermal conductivities, remarkable resistance to corrosion, and simplicity of production, copper alloys are frequently employed. In general, copper alloys are not magnetic. Electrical wire, cable, contacts, and other components.
As given in the problem the density of copper is 8.96 g/mL, and we have to find the volume occupied by the sample of copper.
mass = density×volume
98.2 g = 8.96 g/mL×volume
volume =98.2/8.96
=10.95 ml
Thus, the volume of a 98.2 g sample of copper would be 10.95 ml.
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What is the length of the line to the correct degree of precision?
92 mm
9.2 mm
9.2 cm
9.23 cm
Answer:
9.2 cm
Explanation:
on a ruler you can only measure in cm
and the precision is of one decimal point
The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mile = 1609 m)
Answer:
11.3 km/sec * 1000 m/km / 1609 m/mi = 7.02 mi / sec
7.02 mi/sec * 3600 sec / hr = 25,300 mph
The value of the speed needed to escape the pull of Earth's gravity in miles per hour (mi/h) is 25282.8.
Given the following data;
Speed = 11.3 km/s1 mile = 1609 mIn this exercise, you're required to convert the value of the speed needed to escape the pull of Earth's gravity in kilometer per seconds (km/s) to miles per hour (mi/h).
Conversion:
1 mile = 1.609 kilometer
X mile = 11.3 kilometer
Cross-multiplying, we have;
[tex]1.609[/tex] × X = [tex]11.3[/tex]
[tex]X = \frac{11.3}{1.609}[/tex]
X = 7.0230 miles
Since we know that one (1) hour is equal to 3600 seconds, we would multiply the value of X by 3600 in order to convert it to miles per hour (mi/h).
X = 7.0230 × 3600
X = 25282.8 mi/h
Therefore, the value of the speed needed to escape the pull of Earth's gravity in miles per hour (mi/h) is 25282.8.
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If two people answer i will give brainliest to the first one that answers if right
What term best classifies cell A?
Choose 1 answer:
(Choice A) A Plant cell
(Choice B) B Fungal cell
(Choice C) C Animal cell
(Choice D) D Bacterial cell
Answer:
Choice A) A Plant cell
Explanation:
Match each physical property of matter to the appropriate definition
conductivity
density
buoyant force
solubility
boiling point
probably a little late on this but the dude got everything wrong heres a screenshot of the answers.
Solubility: the ability of a substance to dissolve in another.
Density: the amount of mass in a given volume.
Buoyant force: the upward force on an object in a fluid.
Conductivity: the ability of a substance to transfer heat or electricity.
Boiling point: the temperature at which a liquid becomes a gas.
Solubility can be defined as a measure of how readily a substance dissolves in a solvent to form a solution.
Hence, a substance is typically considered to be soluble if it is able it dissolve completely in a solvent.Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.Buoyancy can be defined as an upward force created by the fluid (liquid) displaced by an object.
Conductivity can be defined as the ability of an object, substance or body to transfer heat or electricity to another.
Boiling point is the temperature at which a physical matter changes phase from liquid to gas.
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A biker goes out for a ride and begins riding North at 18 km/h for 200 minutes, then the driver turns around and rides at 12 km/h South for another 50 minutes.
Answer:
Explanation:
18 km / h
= 300 m / min
12 km / h = 200 m / min
distance travelled in 200 minutes = 300 x 200 = 60000 m
distance travelled in 50 minute in return journey = 200 x 50 = 10000 m
total distance travelled = 70000 m
total time = 250 minute
speed = 70000 / 250
= 280 m / min
= 16.8 km / h
Total displacement = 60000 - 10000 = 50000 m
total time = 250 min
velocity = 50000 / 250
= 200 m / min
= 12 km / h
a marble is shot horizontally from a table .8 m High, and it lands, 1.2 meters away horizontally. what was the initial velocity of the marble as it left the table
Answer:
3 m/s
Explanation:
First, find the time it takes to land.
Given in the y direction:
Δy = 0.8 m
v₀ = 0 m/s
a = 10 m/s²
Find: t
Δy = v₀ t + ½ at²
0.8 m = (0 m/s) t + ½ (10 m/s²) t²
t = 0.4 s
Next, find the velocity needed to travel 1.2 m in that time.
Given in the x direction:
Δx = 1.2 m
a = 0 m/s²
t = 0.4 s
Find: v₀
Δx = v₀ t + ½ at²
1.2 m = v₀ (0.4 s) + ½ (0 m/s²) (0.4 s)²
v₀ = 3 m/s
suppose both the dog and the girl run at a speed of 2 m/s.Calculate both of there kinetic energies. kinetic energy of dog =
Answer:
78
Explanation:
Answer:
78
Explanation:
dakaylaRiley 12
what does a spring balance measure
The spring balance provides a mass measurement
Answer:
mass
Explanation:
The mass is hung on the end of a spring, and the deflection of the spring due to the downwards gravitational force on the mass is measured against a scale.
27 miles per gallon into kilometers per liter.
Answer:
11.479 kilometres per litre
Explanation:
for an approximate result, divide the fuel economy value by 2.352
27 miles per gallon is equivalent to approximately 6.09 kilometers per liter.
What is Unit conversion?A statement of the connection between units that are used to alter the units of a measured quantity without affecting the value is called a conversion factor. A conversion ratio (or unit factor), if the numerator and denominator have the same value represented in various units, always equals one (1).
To convert 27 miles per gallon to kilometers per liter, we need to use conversion factors:
1 mile = 1.60934 kilometers
1 gallon = 3.78541 liters
So, first we convert miles to kilometers:
27 miles * 1.60934 km/mile = 43.45218 kilometers
Then we convert gallons to liters:
1 gallon = 3.78541 liters
27 miles per gallon = 27 miles / 1 gallon = 27 / 3.78541 liters/mile = 7.13888 liters/kilometer
Finally, we divide the distance traveled in kilometers by the amount of fuel used in liters:
43.45218 km / 7.13888 liters = 6.09023 kilometers per liter
Therefore, 27 miles per gallon is equivalent to approximately 6.09 kilometers per liter.
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