Answer:
aqueduct- as opposed to an aquifer which is a geological formation
NASA is launching a rocket into space from Earth. This particular rocket burns its fuel for 5
minutes and then turns off its engines. At this point, the rocket keeps floating along through
space at a speed of 10 km/s.
What is the rockets average acceleration during these first 5 minutes?
The rockets average acceleration during these first 5 minutes is 33.33 m/s².
What is average acceleration?The average acceleration of an object refers to the rate at which the velocity changes with time of motion of the object.
a = Δv/Δt
where;
Δv is change in velocity of the objectΔt is change in time of motionThe given parameters include;
v = 10 km/s = 10 km/s x 1000 m/1km = 10,000 m/s
t = 5 minutes = 5 x 60 s = 300 seconds
a = 10,000 / 300
a = 33.33 m/s²
Thus, the rockets average acceleration during these first 5 minutes is 33.33 m/s².
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6. A student starts at the origin and walks 6 meters away taking a time of 3 seconds to do so. The student then stands still for 2 seconds, and walks back towards the origin a distance of 3 meters in the next 5 in seconds. The student stops for a 1 second break and then walks 7 meters back towards the origin and ends up passing the start point. What distance did this student travel? What was their displacement?
Answer: 16 meters; -4 meters
Explanation:
For this question, you can ignore the times that were given to you.
a.) Let's start with distance. Distance is a total sum, regardless of direction. This student walked 6 meters, stands still (0 meters), 3 meters, and 7 meters. Sum up these values: 6+0+3+7 = 16 meters
b.) Displacement adds direction. The student walks 6 meters away. We will give this the +x-direction. They then walk 3 meters back towards the origin (-x-direction) and pause for a second. They continue to walk 7 more meters toward the origin (-x-direction). This time when we sum these values we must include the signs: 6+(-3)+(-7) = -4 meters. We can test this by referring to the sentence where it says they passed their starting point. This means they are now in the -x-direction and we have a negative displacement.
Hope this helps!
A workman stands on the roof of a 10 meter high building. Another worker tosses him a tool from the ground, which the first workman catches as the tool is falling to the ground. If the total time the tool is in the air is 2.5 seconds, what speed did the worker toss the tool into the air initially?
Answer:
4 Meters per second
Explanation:
This is assuming that the object is tossed straight up and without an angle since your question did not provide one
The diameter of a copper wire is 3mm. Express this diameter in meters.
Answer:
0.003 meters
Explanation:
[tex]d=3mm(\frac{1m}{1000mm} )=\frac{(3)(1)}{1000} =\frac{3}{1000} =0.003m[/tex]
Hope this helps
Answer:
3× 10^ {-3}m
Explanation:
3mm=0.003m
0.003= 3× 10^ {-3}
An object of mass 80 kg fell off a 100 m cliff, with an audible thump. how much energy was released during the collision?
According to potential energy, the energy released is 78.4 kJ.
We need to know about potential energy to solve this problem. The potential energy is the object's energy caused by its position. Potential energy can be determined as
PE = m . g . h
where PE is potential energy, m is mass, g is the gravitational acceleration (9.8 m/s²) and h is height.
From the question above, we know that
m = 80 kg
h = 100 m
By substituting the given parameters, we can calculate the height
PE = m . g . h
PE = 80 . 9.8 . 100
PE = 78400 joules
PE = 78.4 kJ
Hence, the energy released is 78.4 kJ.
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Niobium (nb) has a bcc crystal structure, an atomic radius of 0.143 nm, and an atomic weight of 92.91 g/mol. compute and compare its theoretical density with the experimental value.
Both the theoretical density and experimental value is 8.57g/cm3
The term crystal structure, in crystallography, denotes that the structure in which the atoms (ions or molecules) are attached are arranged in an ordered manner. The smallest repeating unit of the crystal structure is called a unit cell.
Given that:
The radius of Nb is given as R=0.1430nm
The density of Nb is given as d=8.57g/cm3
The atomic weight of Nb is given as M=92.91g/mol
Also, given that the structure is BCC.
The value of the number of atoms per unit cell in BCC is Z=2
The formula for the edge length of BCC structure is,
a=4R/(√3)
Substitute the given values
a=(4*0.1430 nm)/(√3)
=3.3024×10−8cm
The formula for the density of the Nb in BCC structure is,
d2=(Z×M)/(a3×NA)
Substitute the given values.
d1=(2×92.91g/mol)/((3.3024×10-8cm)3 × 6.022 × 1023 mol-1)
=(185.82g/mol)/(21.68cm3/mola3×NA)
=8.57g/cm3
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A farmer measures the distance around a rectangular field. The length of each long side of the rectangle is found to be 43.44 m, and the length of the short side is found to be 20.5 m. What is the total distance around the field?
Answer:
115.88 m
Explanation:
The complete distance around the field (perimeter) is equal to the whole sum of the 4 sides:
Imagine you stroll trough the border of the field, you go 38.44m to the right, 19.5m up, 38.55m to the left, 19.5m down.
How long does it take light to travel through a 2.0- mm -thick piece of window glass?
Light travels at the exact speed of 299,792,458 meters (983,571,056 feet) per second in a vacuum.
The light passes through a 2.0-mm-thick section of window glass
= 1 × [tex]10^{-14}[/tex] sec
What is speed?
Speed is defined as the rate at which an object's position changes in any direction. Speed is calculated as the ratio of distance traveled to time spent traveling. Speed is a scalar quantity because it has a direction but no magnitude. The SI unit of speed is milliseconds per second.
There are several types of speeds:
Consistent speedSpeed controlSpeed in an instantThe average speedSpeed RelativeSpeed is the street name for amphetamine sulphate, but it can also refer to other amphetamines. It's usually an off-white or pinkish powder that resembles crystals. It is also available in the form of a paste, which is usually white/grey or brown in color and can be damp and gritty.
Hence,
A thick piece of window glass = 2 mm
speed of light in medium = speed of light in vacuum / refractive index
= (3×[tex]10^{8}[/tex])/1.5
= 2 ×[tex]10^{8}[/tex] m/s
Time = distance / speed
= (2 × [tex]10^{-3}[/tex] )/(2 × [tex]10^{-11}[/tex])
= 1 × [tex]10^{-14}[/tex] sec
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According to usual sign convention, thermal expansion creates a negative strain.
a. true
b. false
According to usual sign convention, thermal expansion creates a negative strain. TRUE
What does thermal expansion mean?The propensity of matter to vary in volume in response to temperature changes is known as thermal expansion. A substance’s particles move more when it is heated, maintaining a greater average separation. Thermosets experience linear thermal expansion since they are employed in solid form.
What three forms of thermal expansion are there?The term “thermal expansion” refers to an object’s propensity to change its dimensions as a result of heat, including length, density, area, and volume. The substance’s kinetic energy increases when it is heated.
There are three forms of thermal expansion:
Linear growth.
Area enlargement
Volume increase
What causes thermal expansion?When an object’s temperature rises, it expands or grows in size, a process known as thermal expansion. Thermal expansion takes place
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Which would have the larger heat capacity, a large iron skillet or a small iron skillet?
A large iron skillet may hold more heat capacity than a small one because of its larger mass. Both skillet have the same specific heat because they are constructed of the same material.
A physical feature of matter known as heat capacity or thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. J/K is the metric unit for heat capacity.
An extensive property is heat capacity.The heat is related to the substance's mass and the temperature change since the transferred heat is equivalent to the change in internal energy.
An object's mass and chemical makeup both affect its ability to hold heat. Therefore, a large iron skillet may hold more heat capacity than a small one because of its larger mass. Both skillet have the same specific heat because they are constructed of the same material.
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2.
Which of the following statements best explains why measured data must include
units?
A. A measurement must have units from a standard system.
B. Units aid communication with other scientists.
C. Units must match the quantity being measured.
D. A measurement must have units to be meaningful.
A measurement must have units to be meaningful.
Scientific measurements are generally based on the International System of Units. It is important to always include units when recording data, calculating, and reporting results. Units are globally recognized and necessary for the exchange of information among scientists around the world.
A conversion factor is a factor used to convert from one unit of measurement to another. Simple conversion factors can convert meters to centimeters, while more complex conversion factors can convert miles per hour to meters per second. The International System of Units commonly abbreviated as SI from the French Le Système International d'Unités is the modern metric system. SI was founded in 1960 by the 11th General Assembly of Weights and Measures.
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The acceleration of free fall is about 10 m/s^2. Why does the unit second appear twice?
In free fall, the fact that in the acceleration value (10 m/s^2) the unit of the second appears twice indicates that the object is moving at a rate of 10 meters per second every second.
The acceleration is the physical quantity that indicates the variation of velocity as a function of time, and it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2
What is free fall?It is when the object or mobile falls from a height (h) with a positive acceleration equal to the gravity, describing a vertical rectilinear travel.
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When earth catches up to a slower-moving outer planet and passes it in its orbit, in the same way that a faster runner overtakes a slower runner in an outside lane, the outer planet.
When Earth gets closer to a slow-moving outer planet and surpasses it in its orbit, that outer planet shows retrograde motion, similar to how a quicker runner goes past a slow runner in the outside lane.
The orbital movement of a spatial entity in the opposite direction of what is usual in a specific system is known as retrograde motion. The term "retrograde" is based on the Latin terms retro, which means "backward," and gradus, which means "step." As observed from Polaris, all main planets in the Solar System circle the Sun counterclockwise.
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Acellus
Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
7.125 x 8.00 = [?]
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57.0 is the calculated value.
Any pair of non-zero digits separated by a zero is significant. The number 108.0097, for instance, includes seven significant digits. Every zero that is both to the right and left of a digit that is not zero and the decimal point has no significance. The number 0.00798, for instance, contained three significant digits. To calculate how many significant figures are in a number, use the three guidelines below: non-zero digits are always significant. Notable zeros fall inside the range of two significant digits. The importance of a final zero or subsequent zeros only applies to the decimal section.
Since there are only three significant figures in the operation, that would be the number to use: 8.00
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An incandescent light bulb has a power rating of 40 w when connected to a wall outlet of voltage 120 v. the resistance of the filament in the light bulb is?
An incandescent light bulb has a power rating of 40 w when connected to a wall outlet of voltage 120 v. the resistance of the filament in the light bulb is 360 ohms.
The relation between power, voltage and current is :
P =VI ...(i)
According to Ohm's law:
I =V/R
Substituting the value of I in power relation
P = [tex]V^{2}[/tex]/R
Since we have to find the resistance
R = [tex]V^{2}[/tex]/P ...(ii)
Given:
V = 120 V
P = 40 w
Putting the values in eq (ii).
R = [tex]120^{2}[/tex]/40
R = 360 Ω
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what is meant by temperature?
Answer:
Average kinetic energy per molecule in a substance
Explanation:
- How fast is the ducky going when it hits the ground?
Answer:
Doesn't matter how fast it was going, all that matters now is that little ducky went splat and he is living no more
Explanation:
There is not enough information
There is no ground.
There is no ducky.
And it is not moving.
18. Calculate the velocity of a ball that rolled to the right 20 cm in 3 seconds.
-4m/s^2 the velocity of a ball that rolled to the right 20 cm in 3 seconds
Vi = 20m/s
Vf = 0
t = (t2 - t1) = 8s -3s = 5s
Vf - Vi = a*5s
a = (0- 20m/s)/5s = -4m/s^2
What does velocity mean?Velocity is a measure of speed in motion or activity. A more concise word for celerity is speed. Physics uses the word "velocity" specifically to describe how quickly and in what direction an object's location changes. It is a vector quantity that expresses the speed and direction of a body's motion.
Velocity is the term for the rate at which a displacement changes. Acceleration is the measure of a change in velocity. Velocity is a vector quantity because it comprises both magnitude and direction. Acceleration is a vector quantity because it is the speed at which velocity varies.
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without calculating the result, find the number of significant figures in the following product.
(3.52 x 10^-11) x (7.823 x 10^11)
The number of significant figures in the product is 2.7537 x 10¹.
What is significant figure?
The term significant figures refers to the number of important single digits in the coefficient of an expression in scientific notation.
Result of the calculation(3.52 x 10^-11) x (7.823 x 10^11)
= (3.52 x 7.823) x (10⁻¹¹ ⁺ ¹¹)
= 27.53696 x 10⁰
= 27.53696
= 2.7537 x 10¹
Thus, the number of significant figures in the product is 2.7537 x 10¹.
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A ball is dropped from the top of a tall building of height h = 29.47 m .
About how long does it take for the ball to hit the ground? Take acceleration due to gravity to be 9.81m/s/s (Neglect air resistance.)
With the use of motion under the gravity formula, It will take 2.45 seconds for the ball to hit the ground.
What is Linear Motion ?Linear motion involves the movement of a body in a straight line. It can be horizontal motion or vertical motion which is also known as motion under gravity.
Given that a ball is dropped from the top of a tall building of height h = 29.47 m. To know how long it take the ball to hit the ground if acceleration due to gravity is to be 9.81m/s² and we neglect air resistance, we will make use of the formula below
h = ut + 1/2gt²
Since the ball is dropped from the top of a tall building, u = 0
29.47 = 1/2 × 9.81 × t²
29.47 = 4.905t²
t² = 29.47 / 4.905
t² = 6.008
t = √6.008
t = 2.45 s
Therefore, it take 2.45 seconds for the ball to hit the ground.
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(b) Fig. 2.1 shows a plane boundary between air and glass. A ray of light, passing from glass to air, is incident on the boundary at O. The angle of incidence is i.
(i) The critical angle for a ray passing from glass to air is 40.5°. Calculate the refractive index of the glass.
The refractive index, n of glass is 1.53.
What is the critical angle and refractive index of a refracting medium?The critical angle of a refracting medium such as glass is the angle at no refracted ray is obtained for light passing through the medium between the boundary or interface of the medium and a less dense medium, rather an emergent ray which is per perpendicular to the normal is obtained.
Beyond the critical angle, total internal reflection occurs.
The refractive index of a medium is the ration of the velocity of light in the less dense medium to that in a denser medium.
Refractive index = velocity of light in less dense medium/velocity of light in less dense mediumGiven that the critical angle of a medium is C;
Refractive index, n of the medium = 1/ sin C
The critical angle from glass to air is 40.5°
The refractive index of glass = 1/sin 40.5°
Refractive index, n of glass = 1.53
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If a car travels 270 meters in 30 seconds, then what is its
average speed?
Answer:
9m/s
Explanation:
Speed = Distance ÷ Time
Distance=270meters
Time =30 seconds
270m
30s
=9m/s
A heat engine operates in a carnot cycle between reservoirs of temperatures 1000 k and 400 k. it is found to discharge 20 j of heat per cycle to the cold reservoir. what is the work output per cycle?
A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 k and 400 k. it is found to discharge 20 j of heat per cycle to the cold reservoir, then the work done by the engine would be 60 joules.
What is a Carnot engine?It is a hypothetical engine that is presumable to have the highest efficiency of all engines in the universe.
The Carnot engine is the most efficient engine available.
If a heat engine runs in a Carnot cycle between reservoirs with temperatures of 1000 k and 400 k, as stated in the issue. It is discovered that it releases 20 j of heat to the cold reservoir per cycle.
The efficiency of the engine = 1 - 400/1000
=0.6
Heat supplied = heat rejected + work done
The efficiency of the engine = 0.6 = work done/Heat supplied
0.6 = work done/heat rejected + work done
0.6 =W / 20 + W
The work done = 60 joules
Thus, the work done by the engine would be 60 joules.
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A thermometer is used to measure a temperature of 80°C. Which thermometer is the most sensitive?
please answer...will mark as branliest....need help!
Answer:
gas thermometer is more sensitive
The top speed of the blackbird is 2193 mph. given that 1 mile 1.61 km, what is this speed in km/h? (page 32).
The speed of 2193 mph expressed in km/h is: 3530.73 km/h
To solve this problem the we have to do the conversion of units with the given information.
Information about the problem:
v = 2193 miles/hv = expressed in (km/h) = ?1 mile= 1.61 kmBy converting the velocity units from (miles/h) to (km/h) we have:
v = 2193 miles/h * 1.61 km/1 mile
v = 3530.73 km/h
What is unit conversion?It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.
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For horizontally-launched projectiles, which of the following describes acceleration in both directions with a⃗ x=0 and a⃗ y=−9.8 m/s2
A. Acceleration is −9.8 m/s2 in both directions.
B. Acceleration is constant in both directions.
C. Acceleration is equal in both directions.
D. Acceleration is zero in both directions.
For horizontally-launched projectiles, the acceleration is constant in both directions; option B.
What are projectiles?Projectiles are objects which are launched into space and allowed to fall freely under the effect of gravity.
The motion of projectiles is known as projectile motion.
The path of a projectile motion is a parabola.
When an object or a ball is launched into the air, it moves with a constant downward acceleration.
The direction of acceleration due to gravitational force of the earth is constant in both directions.
Therefore, since the acceleration in the x-axis is zero and acceleration in the y-axis is -s -9.8 m/², the acceleration is constant in both directions.
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heat supplied at the rate of 120W to 60g of ice raises it's temperature from -20°c to 0°c in 200s. Calculate the I. heat capacity of the ice Ii. specific heat capacity of the ice. III. time it will take to melt all the ice at 0°c. (s.f=336000 Jkg/K
Answer:
aowbe9 wieveiq diqbedi diwbe
Explanation:
01837192
Which statement is true about vectors?
a. All quantities in physics are not vectors.
b. A vector may have either magnitude or direction.
c. The vector’s length should be proportional to its magnitude.
d. Two vectors can be added only if they have the same direction.
Answer:
b. A vector may have either magnitude or direction.
Explanation:
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The size of a certain insect population is given by p(t)=200e.02t, where t is measured in days. at what time will the population equal 800?
With the help of the mathematical concept of Functions in physics, the number of days for population to reach 800 will be approximately 69 days.
What are Functions in physics?Functions in physics is a mathematical concept used to represent different types of physical quantities in nature. Some types of functions are- linear, quadratic, cubic, exponential and reciprocal functions. A functions relates a set of inputs with another set of desired outputs. Functions are essential for formulating physical relationships in theoretical and practical sciences. For example, functions can be widely used in the representation of electric and magnetic fields in space and time, they are used in quantum mechanics, it is very widely used in determining the position and motion of an object in space. We perform a variety of mathematical operations on functions to make some conclusions and to answer some typical questions related to a physical system.
Here in this question, we have a function which represents a certain population of insect, the function is given by,
[tex]P(t)=200e^0^.^0^2^t[/tex]
where [tex]t[/tex] represents the number of days.
We have to find the total time in days for the population to reach 800 insects, that means,
[tex]P(t)=800[/tex]
Hence,
[tex]200e^0^.^0^2^t=800[/tex]
[tex]e^0^.^0^2^t=\frac{800}{400}[/tex]
[tex]e^0^.^0^2^t=4[/tex]
Taking natural log both sides
[tex]ln e^0^.^0^2^t=ln 4\\[/tex]
[tex]0.02t=ln4[/tex]
[tex]t=\frac{ln4}{0.02}[/tex]
[tex]t=69.3\\[/tex]
[tex]t=69[/tex] days (appproximately)
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What are the magnitude and direction of electric field midway between these two charges?
No matter how far away or how large the charges are, the electric field in the middle of any two equal charges is always zero.
E is equal to Fe/q [where q is a positive test charge, Fe is the electric force vector, and E is the electric field vector].
According to the Coulomb Force, Fe = k Q q / r2,
and as a result, E = [K Q q / r2]/q
=K Q/r^2
Because similar charges repel one another, the field's orientation is away from the core charge.
The outcome is TWO FIELDS with the same magnitude but opposing directions, giving a value of ZERO.
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