TIME REMAINING
52:45
The robotic rover Curiosity has instruments that detect radiation both inside the spacecraft and in the Mars environment. What is most likely the purpose of this radiation detection?
to determine whether human exploration of Mars is possible
to develop better X-ray technology
to find evidence of once-living Martian microorganisms
to investigate evidence of hydrogen and water
Answers
Answer:
D
Explanation: just trust me
Related Questions
A car can complete a 800 m long lap in 10 s. What is the speed of the car
Answers
Answer:
80 mph
Explanation:
can you plzzzzz make me brainliest
Answer:
178.955mph or 179mph
Explanation:
✨calculator✨
A wood box beam designed to support a point Vmid load placed centrally It is constivitced of four boards (ti =30 mm,d=250 mmt2=40 mm,b=150 mm ) in the configuration shown below. The boards are joined by placing wood screws at regular intervals, Δx, in the four locations indicated. The screws have an allowable shear force capacity of V5=1.2kN each. Determine the maximum longitudinal screw spacing, Δx, if the beam is to be designed for a maximum force Vmid =20kN.
Answers
A wood box beam is designed to support a centrally placed point Vmid load. It is constructed using four boards (ti = 30 mm, d = 250 mm, t2 = 40 mm, b = 150 mm) as shown below. The boards are joined by placing wood screws at regular intervals Δx at the four locations indicated.
Each screw has an allowable shear force capacity of V5 = 1.2 kN. We need to determine the maximum longitudinal screw spacing Δx for the beam to be designed for a maximum force Vmid = 20 kN.A box beam is constructed by nailing or screwing several pieces of lumber or engineered lumber together, resulting in a stronger, deeper, and stiffer beam than a single piece of lumber of the same size and material would provide.
The maximum force that a box beam can support is determined by calculating the moment of inertia of the beam, which depends on its dimensions, materials, and configuration.
To find the maximum longitudinal screw spacing Δx, we must first calculate the maximum moment of inertia of the beam, which is given by the formula:I = (n/12) * (b * h^3 - (b - 2t2) * (h - 2t1)^3)where n is the number of boards, b is the width of the beam, h is the height of the beam, t1 is the thickness of the board, and t2 is the thickness of the top and bottom boards.
The height of the beam is given by:h = n * d = 4 * 250 mm = 1000 mmThe maximum moment of inertia of the beam is given by:I = (4/12) * (150 mm * 1000 mm^3 - (150 mm - 2 * 40 mm) * (1000 mm - 2 * 30 mm)^3)I = 9.84 * 10^8 mm^4The maximum longitudinal screw spacing Δx can be calculated using the formula:Δx = Vmid / (2 * n * V5 * (I / h^2))^0.5where Vmid is the maximum force that the beam can support, n is the number of boards, V5 is the allowable shear force capacity of each screw, I is the maximum moment of inertia of the beam, and h is the height of the beam.
Substituting the given values, we get:Δx = 20 kN / (2 * 4 * 1.2 kN * (9.84 * 10^8 mm^4 / 1000 mm^2))^0.5Δx = 78.2 mm. Therefore, the maximum longitudinal screw spacing Δx for the beam to be designed for a maximum force Vmid = 20 kN is 78.2 mm.
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A ball is projected horizontally from the top of a cliff and free falls to the ground.
Which one of the following statements regarding the ball's motion is incorrect?
a. The ball does not accelerate in the horizontal direction.
b. The ball changes its horizontal position by 9.8 m each second.
c. The ball hits the ground with the same horizontal speed as it had when projected.
a
O a
Ob
b
Ос
С
Answers
The incorrect statement is a. The ball does not accelerate in the horizontal direction.
When the ball is projected horizontally, it moves forward with a constant horizontal velocity. This means that it does not accelerate in the horizontal direction, so statement a is incorrect. However, in the vertical direction, the ball is subject to the force of gravity, which causes it to accelerate downwards at a rate of 9.8 m/s^2. This means that the ball's vertical velocity changes by 9.8 m/s each second. When the ball hits the ground, it has both a horizontal and vertical velocity, so statement c is also incorrect.
The incorrect statement is a. The ball does not accelerate in the horizontal direction. However, in the vertical direction, the ball is subject to the force of gravity, which causes it to accelerate downwards at a rate of 9.8 m/s^2. When the ball hits the ground, it has both a horizontal and vertical velocity, so statement c is also incorrect.
When a ball is projected horizontally from the top of a cliff and free falls to the ground, it does not accelerate in the horizontal direction, but it does accelerate in the vertical direction due to the force of gravity. When the ball hits the ground, it has both a horizontal and vertical velocity.
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when was the potential energy the highest in this experiment and why
Answers
The potential energy is highest at a point that is at the maximum height with respect to ground.
Who is the formula to find the potential energy near earth's surface?The formula to find the potential energy near earth's surface is -
U = mgh
Given is to identify the point where potential energy is largest.
The potential energy is highest at a point that is at the maximum height with respect to ground.
Therefore, the potential energy is highest at a point that is at the maximum height with respect to ground.
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Knowing Newton’s 2nd Law, how would you rearrange it to solve for acceleration.
Answers
Answer:
Force / mass
Explanation:
Divide mass on both sides to get acceleration by itself leaving you with mass below force hence divide force by mass
= (mv - mu) / t
= m (v-u) / t
= m a
( since a = (v-u)/t )
From F = m a then a= F/m
A chemistry reference book lists the radius of the hydrogen atom as 1 angstrom. Will the electron ever be further away than 1 angstrom from the nucleus? Explain.
Answers
Yes, the electron can be further away than 1 angstrom from the nucleus in a hydrogen atom. In quantum mechanics, the electron's position is described by a probability distribution, allowing for occasional excursions beyond the average radius.
The radius of 1 angstrom represents an estimate of the average distance between the electron and the nucleus in the ground state of a hydrogen atom. However, in quantum mechanics, the electron's position is described by a probability distribution rather than a fixed orbit.
This means that there is a non-zero probability of finding the electron at distances greater than 1 angstrom from the nucleus, although the probability decreases as the distance increases. Therefore, while the average distance may be 1 angstrom, the electron can occasionally be found further away from the nucleus.
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Suppose you were making a model of the celestial sphere with a ball. Briefly describe all the things you would need to mark on your celestial sphere.
Answers
When making a celestial sphere, one would need to mark the celestial north pole, which is directly over Earth's north pole. You'd also need to mark the celestial south pole, directly over Earth's south pole.
The celestial equator which is a projection of Earth's equator into space. Finally the ecliptic, which is the path the sun follows as it appears to circle around the celestial sphere once each year. All celestial bodies can be projected onto a hypothetical sphere called the celestial sphere, which is centered on the Earth.
The other half of the celestial sphere is below the horizon, so an observer on the surface of the Earth may only view half of it at any given time. Even though the Earth's rotation constantly reveals fresh areas of the celestial sphere, unless the observer is situated at the equator, there will always be a portion of the sphere that is hidden.
The celestial sphere seems to rotate every day from east to west because of how the Earth spins on its axis, and stars appear to move in a circle around two locations in the sky.
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What is the highest and lowest pressure?
Answers
The highest pressure is found in the depths of the ocean and the lowest pressure can be found in the Earth's atmosphere at high altitudes, such as in a vacuum.
Pressure is a measure of the force exerted by a fluid per unit area and it can vary greatly depending on the environment. The highest pressure is found in the depths of the ocean, where the pressure from the weight of the water column above increases with depth.
On the other hand, the lowest pressure can be found in the Earth's atmosphere at high altitudes, such as in a vacuum. A vacuum is a region with no matter, and thus no pressure, and is often found in outer space.
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You pull your little sister across a flat snowy field on a sled. Your sister plus the sled have a mass of . The rope is at an angle of 45 degrees to the ground. As you pull with a force of , the sled travels a distance of . How much work do you do
Answers
Answer:
W = 0.7071 F x, W = 35.355 J
Explanation:
Work is defined
W = F. d
bold indicates vectors,
W = F d cos θ
where the angle is between force and displacement.
As the system runs on snow, the friction force is negligible, therefore
W = F x cos 45
W = 0.7071 F x
Unfortunately the values of the force and the distance do not appear, suppose that the force is F = 10 N and the distance x = 5m
W = 0.7071 10 5
W = 35.355 J
Work is positive because force and displacement go in the same direction
which shows valid accesses for an array a and vector v, each with 10 elements?
Answers
The possible valid accesses for an array a and vector v, each with 10 elements is given below:Array: a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9]Vector: v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]
The term array is used to define a set of similar data types that are stored in contiguous memory blocks. The index of an array starts at 0, which means the first element of the array is stored at index 0. In the case of arrays, the elements must be of the same data type.The term vector is defined as a dynamic array, which means that the size of the vector can be changed during runtime. Vectors are defined in the same way as arrays, except that they have a dynamic size limit and can be easily resized.
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Compare the inner planets with the outer planets.
Answers
Inner Planets:
- Rocky
- Small
- Only 3 moons total
- Very close to each other (for space)
- Underweight
Outer Planets:
- Gassy oop-
- GIANT
- Over 200 moons total
- VERY far from each other
- Obese
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Good luck foe.
Lb.
multi choice
12) When you move your hand or foot, your body has converted potential energy into ________ energy.
Answers
you body has converted potential energy to kinetic energy
Answer: It’s kinetic energy
Explanation: when you move your hand or foot, your body has converted potential energy into kinetic energy.
how do we calculate the value of work?
Answers
Answer:
Work = Force × Distance
Explanation:
Work = Force × Distance
The SI unit of work is Joule
-TheUnknownScientist
What is the acceleration of a car that goes from zero to 60m/s in 15s?
Answers
Answer:What is the acceleration of a car that moves from rest to 15.0 m/s in 10.0 s? Vi=0, vf= 15.0 m/s,t=10.0s, a=? a= vf =vi/tA=15.0m/s-0m/s/10.0s = 15.0s/10.0s m/s*1/s =1.50 m/s^2 11.
Explanation:
During phonation the following statement is true: the vocal folds begin to close as the air pressure between the vocal folds begins to increase due to changes in air pressure in the middle ear the speaker increases the air pressure below the vocal folds, in order to increase pressure against the trachea the vocal folds are pushed apart by increases in pressure generated by the lungs the speaker creates an increase in the air pressure below the vocal folds, which exerts a force on the open vocal folds
Answers
The statement that is true during phonation is the last option, the speaker creates an increase in the air pressure below the vocal folds, which exerts a force on the open vocal folds. During phonation, the process of producing sound with the vocal folds, the speaker exhales and generates airflow from the lungs.
The airflow passes through the vocal folds, which are initially open. By creating an increase in the air pressure below the vocal folds, the speaker exerts a force on the open vocal folds, causing them to come together and close.
When the vocal folds begin to close, the air pressure between them starts to increase. This increase in air pressure helps maintain the closure of the vocal folds during phonation, allowing them to vibrate and produce sound.
The other statements mentioned in the question are not accurate or relevant to the process of phonation. Changes in air pressure in the middle ear and the pressure against the trachea are not directly involved in the closure and vibration of the vocal folds during phonation. The primary mechanism for vocal fold closure and vibration is the control of airflow and air pressure by the speaker's respiratory system and vocal tract.
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Do tuning forks make sounds when hit from the vibrations? I'll give brainiest
Answers
Answer:
Yes
Explanation:
they make sound due to the fact that the vibration from the tuning fork itself interacts with the air around it. it's also worth mentioning that anything that vibrates creates sound waves as well.
A uniform flat disk of radius R and mass 2M is pivoted at point P. A point mass of 1/2 M is attached to the edge of the disk. Calculate the total moment of inertia IT of the disk with the point mass with respect to point P, in terms of M and R.
Answers
The total moment of inertia IT of the disk with the point mass with respect to point P is 3/4 MR^2, in terms of M and R.
The total moment of inertia IT of the disk with the point mass with respect to point P can be calculated by using the parallel axis theorem, which states that IT = ICM + md^2, where ICM is the moment of inertia of the disk about its center of mass, m is the mass of the point mass, and d is the distance between the point mass and the pivot point P.
The moment of inertia of the disk about its center of mass ICM can be found from the formula for a uniform disk: ICM = 1/2 MR^2.
The distance between the point mass and the pivot point P is equal to the radius R of the disk.
Substituting these values into the parallel axis theorem, we get:
IT = ICM + md^2
= 1/2 MR^2 + (1/2 M)(R^2)
= 3/4 MR^2
Hence, the total moment of inertia IT of the disk with the point mass with respect to point P is 3/4 MR^2, in terms of M and R.
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Question 3 of 5What could you do to increase the electric force between two chargedparticles by a factor of 16?A. Reduce one particle's charge by a factor of 16.B. Reduce one particle's charge by a factor of 4.C. Increase one particle's charge by a factor of 16.O D. Increase one particle's charge by a factor of 4.
Answers
Explanation
the force between 2 charges is given by the formula:
\(\begin{gathered} F=\frac{Kq_1q_2}{r^2} \\ where \\ q_i\text{ is the charge on object i} \\ r\text{ is the distance between the charges} \\ K=Coulomb\text{ constant=8.9875*10}^9N*\frac{m^2}{c^2} \end{gathered}\)then,we can check every option and compare the result to the original, hence
Step 1
a)option A
reduce one particle's charge by a factor of 16
so
\(q^{\prime}_1=\frac{q_1}{16}\)now, replace
\(\begin{gathered} F=\frac{Kq_1q_2}{r^2} \\ F_A=\frac{K\frac{q_1}{16}q_2}{r^2}=\frac{1}{16}\frac{Kq_1q_2}{r^2} \\ F_A=\frac{1}{16}(original) \\ F_A=\frac{1}{16}\frac{Kq_1q_2}{r^2} \end{gathered}\)therefore, option A works
Step 2
Answer the following questions about the Earth in Space. Type your answer below each question and change the text color (blue). Answer the questions in 2-3 sentences.
Describe the distance of the earth from the sun
Illustrate the size and shape of the earth.
What happens as the earth revolves around the sun?
Why do we have leap years?
How does the earth’s motion affect seasons on earth?
Answers
The Earth orbits the sun at a distance of around 93 million miles (149.6 million kilometers). This is known as an astronomical unit (AU).
What is the shape of the Earth?With a diameter of 12,742 kilometers (7,918 miles), the Earth is basically spherical. It has a bulge near the equator and a slight flattening at the poles.
Seasons change as the Earth rotates around the Sun due to its leaning position of 23.5-degree axial tilt. Summer occurs when the sun is facing the hemisphere, while winter happens in the other hemisphere.
Leap years are added to the calendar to account for the extra quarter of a day that it takes the Earth to orbit around the Sun. Without leap years, our calendars would fall out of sync with the seasons.
The Earth's motion affects the seasons on Earth due to the axial tilt mentioned earlier. The hemisphere tilted towards the Sun experiences more direct sunlight, causing it to be warmer and experience summer, while the hemisphere tilted away experiences less direct sunlight and cooler temperatures, causing winter.
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define amplitude & period of the particle performing linear S.H.M
Answers
Answer:
This type of a behavior is known as oscillation, a periodic movement between two points. ... Amplitude: The distance from the center of motion to either extreme. Period: The amount of time it takes for one complete cycle of motion.
Explanation:
Amplitude (a):- The maximum displacement of particle from its mean position on either side is called amplitude.
Periodic time:- The time taken by a wave to complete one oscillation is called periodic time.
ocean waves and electromagnetic waves are similar in that they both transmit energy. t or f
Answers
Answer:
the answer is true they actually do
Based on the images, what conclusion can Mariam make about fish and mammals?
Answers
Answer:
Fish and mammals are related, even though adult fish and adult mammals do not look alike.
Explanation:
Adult fish and adult mammals look very different. But the embryos of fish and mammals share a number of similarities. So, Mariam can conclude that fish and mammals are related, even though adult fish and adult mammals do not look alike.
I realized that the fish and mammals don't look alike but their embryos do so Fish and mammals are related, even though adult fish and adult mammals do not look alike.
Hope this helps if it does give it a thumbs up and a heart so I know it's right if it's wrong tell me what it was!!
The image shows the pH value of some common substances. Which statement is true?
A-Pure water is acidic
B-Pure water is basic
C-Pure water is both acidic and basic
D-Pure water is neither acidic nor basic
Answers
a. Consider a light bulb connected to a battery with wires. How must the light bulb be connected in order for it to light?
b. Identify the relevant parts of the bulb and battery. Explain, using the concept of potential difference, why and how your configuration causes the bulb to light. Do not use the phrase "complete circuit".
Answers
To light the bulb, it must be connected to the battery in a way that the positive terminal of the battery connects to one end of the bulb's filament and the negative terminal connects to the other end of the filament.
The relevant parts of the bulb are the filament and the two contact points, while the battery has a positive terminal and a negative terminal.
When the bulb is connected in the configuration described above, a potential difference is created between the positive and negative terminals of the battery.
This potential difference causes an electric current to flow through the wires and the filament of the bulb.
The filament, made of a material with a high resistance, heats up due to the current flow and begins to emit light as a result.
Hence, A light bulb must be connected to a battery such that its filament is connected between the positive and negative terminals of the battery. This creates a potential difference, allowing the current to flow through the filament and causing it to emit light.
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What happens when the control rods in a reactor core are completely lowered between the fuel rods?
Answers
When the control rods in a reactor core are completely lowered between the fuel rods, they act as a crucial safety measure in controlling the nuclear reaction.
Control rods are made of materials that absorb neutrons, such as boron or cadmium. By lowering them into the reactor core, they effectively reduce the number of free neutrons available to collide with the fuel rods' atomic nuclei, which are typically made of uranium or plutonium.
As the control rods absorb more neutrons, the chain reaction slows down, and the rate of nuclear fission decreases. This reduction in fission events leads to a decrease in the amount of heat and energy produced within the reactor core. As a result, the temperature and pressure in the reactor are maintained at safe levels.
In summary, fully lowering control rods in a reactor core serves as a vital mechanism to manage and control the nuclear reaction taking place. This action ensures the stability and safety of the reactor's operation, preventing potential accidents or overheating. It is important for nuclear power plants to continuously monitor and adjust the position of control rods to maintain the desired reaction rate and keep the facility operating safely and efficiently.
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What is the momentum of a 10 kg dog running at a speed of 13m/s?
Answers
Answer:
P = mv
Explanation:
P = Momentum
m = mass
v = velocity
Therefore, P = 10 x 13 = 130 kg • m/s
A car accelerates at a constant rate of 1. 83m/s^2 along a flat straight road. The force acting on the car is 1870N. Calculate the mass of the car
Answers
The mass of the car is calculated as 1021.86 kg. We can calculate the mass of the car by using the formula: mass = Force / acceleration
Given information: Acceleration of the car = 1.83 m/s²
Force acting on the car = 1870 N
We know that Force = mass × acceleration
According to the question, we need to find the mass of the car. We can calculate the mass of the car by using the formula: mass = Force / acceleration
Putting the values in the above equation, we get mass = 1870 N / 1.83 m/s²
So, the mass of the car is: mass = 1021.86 kg
Therefore, the mass of the car is 1021.86 kg.
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Help me please I’m so bad at physics
Answers
Answer:
C would probably be the best answer.
Explanation:
Switches control the flow of an electrical current in a circuit. Switches open or close the circuit. If you open a circuit, you turn it off, and if you close it, you turn it on.
a) Explain the following terms in brief: i) Infiltration capacity ii) Infiltration rate iii) Infiltration b-index b) During a storm the rate of rainfall observed at a frequency of 15min for one hour are 12.5, 17.5, 22.5, and 7.5cm/h. if the Phi-index is 7.5cm/h calculate the total run-off. c) The observed annual runoff from the basin of an area 500Km? Is 150Mm" and the corresponding annual rainfall over the basin during the same year is 750mm. what is the runoff coefficient?
Answers
i) Infiltration capacity: Infiltration capacity refers to the maximum rate at which water can penetrate or infiltrate into the soil surface.
ii) Infiltration rate: Infiltration rate represents the actual rate at which water is infiltrating into the soil. It is the speed or velocity at which water is penetrating the soil surface
iii) Infiltration b-index: The infiltration b-index is a parameter used to estimate the soil moisture retention characteristics and infiltration rate of a soil.
b) To calculate the total runoff, we need to determine the excess rainfall for each time interval and sum them up.
Excess rainfall = Rainfall rate - Phi-index
For the four intervals:
Excess rainfall1 = 12.5 cm/h - 7.5 cm/h = 5 cm/h
Excess rainfall2 = 17.5 cm/h - 7.5 cm/h = 10 cm/h
Excess rainfall3 = 22.5 cm/h - 7.5 cm/h = 15 cm/h
Excess rainfall4 = 7.5 cm/h - 7.5 cm/h = 0 cm/h
Now, we can calculate the total runoff by summing up the excess rainfall for all intervals:
= 5 cm/h + 10 cm/h + 15 cm/h + 0 cm/h
= 30 cm/h
c) The runoff coefficient can be calculated by dividing the observed annual runoff by the corresponding annual rainfall.
Converting the units to the same length scale:
Annual runoff = 150 Mm³ = 150,000,000,000 m³
Annual rainfall = 750 mm = 0.75 m
Runoff coefficient = 150,000,000,000 m³ / 0.75 m
= 200,000,000,000
Infiltration refers to the process by which water enters and permeates into the soil or porous surfaces. It occurs when precipitation, such as rain or snow, falls onto the ground and is absorbed into the soil or surface materials. Infiltration plays a crucial role in the water cycle and is a key process in hydrology.
The rate of infiltration is influenced by various factors, including soil type, vegetation cover, slope gradient, and the initial moisture content of the soil. Soils with high permeability, such as sandy soils, typically have a higher infiltration rate compared to soils with low permeability, such as clay soils. Infiltration is important for replenishing groundwater reserves, as it allows water to percolate downward and recharge aquifers. It also helps to reduce surface runoff, erosion, and flooding by absorbing and storing water within the soil profile.
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The Empire's space station is a long way from any star. It is circular and has a radius of 5. 10 km. The angular velocity that is needed to give the station an artificial gravity of 9. 80 ms2/ at its circumference is:___.
A) 4. 4 times 10^-2 rad/s.
B) 7. 0 times 10^-3 rad/s.
C) 0. 28 rad/s.
D) -0. 22 rad/s.
E) 1. 3 times 10^3 rad/s
Answers
Answer:
A
Explanation:
r= 5100m
acceleration of center=g= \(\frac{v^{2} }{r}\)
v= rw, Which is angular velocity X radius
put this in acceleration of center equation
= \(\frac{(rw)^{2} }{r} =g\)
= \(rw^{2} =g\)
= \(5100 . w^{2} = 9.8\)
\(w^{2} = 0.0019\)
=\(\sqrt{0.0019} = 0.0438\)
which is approximately A.