Answer:
A
Explanation:
There are three basic forces in aerodynamics: acceleration, which moves an airplane forward; drag, which holds it back; and height, which keeps it airborne. Lift is generally explained by three theories: Bernoulli's principle, the Coanda effect, and Newton's third law of motion.
If you drop a rock from a height of 13 m, it accelerates at 9.8 m/s2 and strikes the ground 1.62882 s later. If you drop the same rock from half that height, what will be its acceleration?
You had me worried there for a second. I thought you were going to ask how much the time changes, or how much the speed changes as it hits the ground, and I was gonna skip this question and go to bed.
But the acceleration won't change. That's always 9.8 m/s². That's the acceleration of gravity on Earth. It doesn't depend on what you drop, or what its mass is, or how heavy it is, or what color it is, or how high you drop it from. The only way you can change it is to drop the rock through air or water, or on a different planet.
A sound wave ________ and ______ the air molecules around your ear.
A sound wave squeezes together and thins out the air molecules around your ear. The places where these things happen are called the compressions and rarefactions of the sound wave.
Most of the Earth's volcanoes occur
A.
near the center of tectonic plates.
B.
where there are no tectonic plates.
C.
along tectonic plate boundaries.
D.
before tectonic plates can form.
Answer:
A.
Explanation:
NEAR THE CENTER OF TECTONIC PLATES.
Answer: C. along tectonic plate boundaries
Explanation:
Right on Study Island 2021
Your body temperature begins to rise during strenuous exercise in hot weather. Specialized nerve cells on the skin detect an increase in temperature; your brain detects an increase in blood temperature. You begin to sweat and as the sweat evaporates, more latent heat of vaporization is removed from your body and you cool down. In this case, your skin and brain acts as ________________ in maintaining homeostasis.
Answer:
receptors
Explanation:
In this case, your skin and brain act as receptors in maintaining homeostasis. These receptors are monitors in different parts of an organism's body that are there to detect specific changes that occur and activate very specific responses in order to counteract these changes and maintain a very stable system. This is exactly, what your skin and brain are doing in this scenario, they detect the change in temperature and counteract its effects through sweat which ultimately causes the opposite effect and maintains equilibrium in your body.
What do all muscles have a store of, which is used for fuel?
O A. Oxygen
O B. Protein
O c. Carbohydrates
O D. Glycogen
Answer:
D. Glycogen
Explanation:
the major fuels for muscle are glucose fatty acids, and ketone bodies. muscle differs from the brain in having a large store of glycogen
Answer:
D. Glycogen
Explanation:
About 3/4 of all the glycogen in the body is stored in muscle.
Three resistors are placed in series. They have the following resistances: R1 = 20 ohms, R2 = 20 ohms, R3 = 10 ohms. What
current would be moved through this circuit by a 5-V power supply?
Answer:
0.10 A
Explanation:
The moon's light comes from
within the moon
the earth
the sun
stars in other galaxies
the current through a wire is 0.5 a when the potential difference across is 4.0.v. calculate the resistance of the wire
v = ir
where v is voltage and i is current
r = v/i
r = 4/0.5
r = 8 ohms
The current through a wire is 0.5 a when the potential difference across is 4.0.v, the resistance of the wire is 8.0 ohms.
Ohm's law, which states that the resistance (R) of a wire is equal to the ratio of the potential difference (V) across the wire to the current (I) flowing through it, can be used to calculate the resistance of a wire.
It has the following mathematical expression:
R = V ÷ I
Here, it is given that:
Potential difference (V) = 4.0 V
Current (I) = 0.5 A
Now we can substitute the values into the formula:
R = 4.0 V ÷ 0.5 A
Calculating the division:
R = 8.0 ohms
Therefore, the resistance of the wire is 8.0 ohms.
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(18 points) Which list places different units of matter in the correct sequence from
smallest to largest?
A. Protons, bricks, atoms, rock particles, buildings
B. Protons, atoms, bricks, rock particles, buildings
C. Protons, rock particles, atoms, bricks, buildings
D. Protons, atoms, rock particles, bricks, buildings
The units of matter in the correct sequence from smallest to largest will be Protons, atoms, rock particles, bricks, buildings. Option D is correct.
What is an atom?Atom is the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.
The atom consists of matter that may be split without releasing electrical charges.
In the nucleus, proton and the neutron is existing,the atom is the fundamental part of the particle. Many particle combines to form bricks used in the construction of building.
The units of matter in the correct sequence from smallest to largest will be Protons, atoms, rock particles, bricks, buildings.
Hence, option D is correct.
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Which of the following would have the MOST thermal energy?( A 33 gram ice cube. O A 100 gram cup of coffee. O A 50 gram spoon sitting on the counter O A 500 gram pot of boiling water.
Which statement is true about the monopoly being depicted?
Answer:
no idea man i say the third one
Explanation:
If two arm wrestlers exert a force on each other’s hands, and the hands don’t move, the forces must be *
balanced
unbalanced
weak
strong
A dog walks 40. m west, then 10. m east and then 50. m south. What is the
distance and displacement traveled?
The total distance traveled by the dog is 100 m and the displacement of the dog is 58.31 m.
The given parameters;
Initial position of the dog, 40 m westSecond position of the dog, 10 m eastFinal position of the dog, = 50 southThe displacement of the dog is the change in its initial position and the final position.
The resultant of the dogs position in x-direction: = 40 m - 10 m = 30 m
The resultant of the dogs position in y-direction: 50 m
The magnitude of the displacement;
R² = 30² + 50²
R² = 3400
R = √3400
R = 58.3 m
The distance covered by the dog is the sum of all the positions of the dog.
Distance = 40 m + 10 m + 50 m
Distance = 100 m.
Thus, the total distance traveled by the dog is 100 m and the displacement of the dog is 58.31 m.
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To strike or hit something with great force
Answer:
To strike or crash into with resounding impact. To collide or strike with great force. Used to indicate the sound of a forceful blow or collision.
Answer:
To strike or crash into with resounding impact. To collide or strike with great force. Used to indicate the sound of a forceful blow or collision.
Explanation:
A tourist drops a rock from rest from a guardrail at an observatory point overlooking a valley. Calculate the velocity of the rock at the following times: a) 2.0 s b) 6.0 s 6. Determine the displacement for the rock in question 6 at
Answer:
a) 19.6 m/s, 19.6 m
b) 58.8 m/s, 176.4 m
Explanation:
Take down to be positive. Given:
v₀ = 0 m/s
a = 9.8 m/s²
a) Find v and Δy when t = 2.0 s.
v = at + v₀
v = (9.8 m/s²) (2.0 s) + 0 m/s
v = 19.6 m/s
Δy = v₀ t + ½ at²
Δy = (0 m/s) (2.0 s) + ½ (9.8 m/s²) (2.0 s)²
Δy = 19.6 m
b) Find v and Δy when t = 6.0 s.
v = at + v₀
v = (9.8 m/s²) (6.0 s) + 0 m/s
v = 58.8 m/s
Δy = v₀ t + ½ at²
Δy = (0 m/s) (6.0 s) + ½ (9.8 m/s²) (6.0 s)²
Δy = 176.4 m
accelerates uniformly from rest, reaching a speed of 36 meters per second in 6.0 seconds
Answer:
What's the question?
Explanation:
4. Why does time play an important role in collisions?
a) Time plays no important role in collisions
b) The longer the time of the collision, the smaller the force
c) The longer the time of the collision, the larger the force
d) The shorter the time of the collision, the smaller the force
The longer the time of the collision, the smaller the force. (B)
That's why, if you fall off the roof, you want to be stopped by a net or a pile of leaves, and not by the ground. You want the stop to last as long as possible. Like everybody says: It's not the fall that hurts, it's the stop at the end.
3. Bamey is walking with all his good friends. If he began walking away from Lucy 12 seconds ago at an average speed of 1.5 m/s and is now 25 m from Lucy, the how far from her was he when he began walking?
Answer:
7 meters away
Explanation:
12 x 1.5 = 18
25 - 18 = 7
Use the table below to answer the questions.
Measured Values for a Stamp's Length
Student 1 Student 2 Student 3
Trial 1 2.60 cm 2.70 cm 2.75 cm
Trial 2 2.72 cm 2.69 cm 2.74 cm
Trial 3 2.65 cm 2.71 cm 2.64 cm
Average 2.66 cm 2.70 cm 2.71 cm
Three students measured the length of a stamp whose accepted length is 2.71 cm. Based on the table, which statement is true?
Multiple choice question.
A)
Student 3 is both precise and accurate.
B)
Student 2 is both precise and accurate.
C)
Student 1 is more accurate than Student 3.
D)
Student 2 is less precise than Student 1.
Three students measured the length of a stamp whose accepted length is 2.71 cm, on the basis of the table student 2 is both precise and accurate, therefore the correct answer is option B.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
The degree to which a measurement is accurate in relation to its true value. The degree to which the same results are produced by repeated measurements under the same circumstances is known as precision.
Thus, according to the chart, student 2 is both exact and accurate, hence the proper response is option B. Three students measured the length of a stamp, and the approved length is 2.71 cm.
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Enzo investigated the effect of different types of fertilizers on the growth of bean plants. He hypothesized that fertilizer B would result in the greatest amount of growth. However, the results showed that the control plants without fertilizer had the greatest growth. Why was Enzo's data still valuable even though it did not support his hypothesis?
Answer:
The answer is "In this information, Enzo will be confident that if any fertilizer is required only for plants".
Explanation:
The Beans plants were members of the group of legumes. Legume flowering plant under which the roots form nodules. These nodules require a specific bacterium called bacteria, which fix nitrogen. Its bacterium transforms nitrogen from the atmosphere into the soil's nitrate. Consequently, for some of its growth, beans do not require fertilizer.
write dimention of plane angle work resistance density torgue
Torque : ML^2T^–2
Density : ML^–3
Work : ML^2T^–2
Plane angle: dimensionless quantity
Resistance : M^1 L^2 T^-3 I^-2
A particle or object with more electric charge produces a stronger and larger electric field.
true or false
A bullet is shot horizontally from the edge of a tall cliff. At the instant the bullet is shot, a rock is dropped from the same height. Neglecting air resistance, which one will hit the ground first
Answer:
The bullet and the rock will hit the ground at exactly the same time
Explanation:
Due to the gravitational forces, defined by Newton's law of gravitation, the acceleration of objects towards the center of the Earth is constant and equal to the acceleration due to gravity, g ≈ 9.8 m/s².
Therefore, given that the initial vertical velocity, u, of the rock and the bullet are both equal to zero, from the following equation of motion, we have;
s = u×t + 1/2·g·t²
t = Time
s = The height from which the bullet is fired and the rock is dropped
s = 0×t + 1/2 × 9.8 × t²
s = 1/2 × 9.8 × t²
t = √(2 × s/9.8)
Therefore, the time to hit the ground is only dependent on the height from which the bullet and the rock were allowed to fall freely.
When conducting a polygraph test why is it important for the interviewer to establish a baseline on the interviewee?
Answer:
Because always when we do an experiment, we need something to compare.
For example, if we want to see how much change a given color paint when we add different amounts of white paint to it, we need to have at least one sample of pure color paint, so we can compare it whit the ones with mixed paints.
Well, the case of the polygraph is exactly the same, we need to have a baseline, so we the interviewer can see if for some questions there is a change in the line compared with the baseline.
which of newtons laws explains why when you bump into something you fall backwards
Answer:
Newtons third law
Explanation:
every action has an equal but opposite reaction
it exerts the force back on you
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The track team participated in the 400-meter walk/run for fitness. The first to cross the finish line had a time of 4 minutes and 45 seconds. What was the average speed of the winner in meters per second?
Explanation:
total distance travelled = 400m
total time taken = 4min 45sec = 4*60 + 45 = 285sec
Avg speed = 400/285
= 2.162162....m/s
= 2.162....m/s
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How would you determine the acceleration from a v vs. t graph?
The acceleration is the slope of the v/t graph.
-- If the graph is a straight line, then pick any piece of the line, or even the whole graph, and divide (change in 'y') by (change in 'x') for the piece you chose.
-- If the graph is a curve or a squiggle, then you can do the same thing with a piece of it, and you get the average acceleration during that piece.
-- If you need the acceleration at one point on the graph, you have to lay a straight line against that point on the graph, and find the slope of that straight line.
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.
A large black cross in a purple circle with a black line around the purple, with 10 small green balls dispersed within the purple circle.
What experimental evidence led to the development of this atomic model from the one before it?
Answer:
B: The colors of light emitted from heated atoms had very specific energies.
Explanation:
B: The colors of light emitted from heated atoms had very specific energies.
Armand hands the rock to Pierre, who is standing next to the trampoline. Explain how Armand moves, in terms of the forces acting on him.
Answer:
Armando's weight ,restored force created by the trampoline
a harmonic movement within the trampoline
Explanation:
In a trampoline we have two forces that actuate Armando's weight and the restored force created by the trampoline that depends on the deformation distance of the elastic canvas.
Amando's weight is vertical and directed towards the center of the Earth and has a constant value, this weight is balanced with the elastic force the springboard exerts on Armando in a vertical direction.
In general, when entering the trampoline, a small jump is made, this creates a speed that deforms the canvas until the speed is reduced to zero, at this point the elastic force is greater than the weight and the boy begins to climb, After the boy leaves the canvas he meets only the force of gravity and his speed decreases to zero and begins his fall.
In Summary Armando is in a harmonic movement within the trampoline
Se dispara una bala con una velocidad de v = 300[m/s] contra un cascarón esférico de papel que gira con MCU respecto a un eje vertical. Sabiendo que el radio del cascarón es de 10[cm]. Calcular la rapidez angular mínima que deberá girar el cascarón para que el proyectil haga únicamente un agujero. La dirección del movimiento de la bala pasa por el centro de la esfera.
Answer:
w = 4.712 10⁻³ rad / s
Explanation:
For this exercise, the time it takes for the bullet to travel the distance of 2R must be equal to the time that the hole must travel half a circle.
Let's start by calculating the time it takes for the bullet, which is going at constant speed.
v = x / t
t = x / v
t = 2R / v
t = 2 0.10 / 300
t = 6.666 10⁻⁴ s
As they ask that a single hole is formed in this time, it must be rotated half a circle, that is, θ =π rad, for which we use the angular scientific relations, where the shell has constant angular velocity
w = θ / t
w = π / 6,666 10⁻⁴
w = 4.712 10⁻³ rad / s