To calculate the acceleration of the system, use Newton's second law of motion. The force exerted by each crate on the other is equal and opposite.
Explanation:To calculate the acceleration of the system, we need to use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. The net force acting on the system is the applied force minus the force of friction. So, the acceleration of the system can be calculated as:
Net force = Applied force - Force of friction
F_net = F_applied - F_friction
The force of friction can be calculated using the formula:
Force of friction = coefficient of friction * Normal force
Now, to calculate the force that each crate exerts on the other, we need to consider that the force exerted by one crate on another is equal in magnitude but opposite in direction. So, if we know the force exerted by one crate on the other, we can simply use Newton's third law of motion to find the force exerted by the other crate on the first crate.
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Our verbal and nonverbal _a______ provides clues to our attitude on a given topic.
1. Which of the following does not need to be done when constructing a frequency
distribution?
A) select the number of classes desired
B) find the range
C) make the class width an even number
D) use classes that are mutually exclusive
2. What are the boundaries of the class 12-16?
A) 11.5 and 16.5
B) 10 and 18
C) 12 and 16
D) 4
3. Which of the following pairs of class limits would be appropriate for grouping the
numbers 12, 15, 10, and 17 ?
A) 9-13 and 13-17
B) 10-12 and 15-17
C) 10-12 and 13-17
D) 10-13 and 14-17
1. Which of the following does not need to be done when constructing a frequency
distribution?
A) select the number of classes desired
B) find the range
C) make the class width an even number
D) use classes that are mutually exclusive
2. What are the boundaries of the class 12-16?
A) 11.5 and 16.5
B) 10 and 18
C) 12 and 16
D) 4
3. Which of the following pairs of class limits would be appropriate for grouping the
numbers 12, 15, 10, and 17 ?
A) 9-13 and 13-17
B) 10-12 and 15-17
C) 10-12 and 13-17
D) 10-13 and 14-17
Waves are observed passing under a dock. Wave crests are 8.0 meters apart. The time for a complete wave to pass by is 4.0 seconds. The markings on the post submerged in water indicate that the water level fluctuates from a trough at 6.0 meters to a crest at 9.0 meters. What is the period of the wave?
The period of the wave is 4 seconds
Explanation;The period of a wave or periodic time is the time taken for one complete oscillation to occur. In this case, one complete oscillation occurs when the wave moves from one crest to the next or a trough to the next. This takes 4 seconds. Therefore the period is 4 seconds.Frequency on the other hand is the number of oscillations by a wave in one second. Thus, f = 1/T, that is frequency is the reciprocal of periodic time.A ball having a weight of 1.5 N is dropped from a height of 4 meters. (Neglect air friction.) How much mechanical energy is "lost" just before it hits the ground?
A car has an engine which delivers a constant power. It accelerates from rest at time t = 0, and at t = t0 its acceleration is a0. What is its acceleration at t = 2t0? Ignore energy loss due to friction. ...?
The acceleration a0 at time t0 in a car with a constant power engine will be greater than the acceleration at time 2t0. Due to the increased velocity over time, the acceleration decreases when power is constant, because power is the product of force and velocity.
Explanation:A car with a constant power engine accelerates from rest. If the acceleration at time t = t0 is a0, then the car's acceleration at time t = 2t0 will be different because the speed has increased, and acceleration is inversely proportional to velocity when power is constant. Since power (P) is equal to force (F) times velocity (v), and acceleration (a) is force divided by mass (m), as v increases, a must decrease if P is constant.
To calculate the exact acceleration, we would need to integrate the power over time to find velocity as a function of time and then differentiate to find the acceleration. However, without specific numerical values or additional information about the mass of the car or the constant power delivered by the engine, we cannot provide a precise numerical answer. Conceptually, the acceleration at time t = 2t0 is less than the acceleration at time t = t0 if the engine delivers constant power.
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 16 m/s at an angle 47 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground.
What is the maximum height the ball goes above the ground?
1. How many correct experiments do we need to disprove a theory? How many do we need to prove a theory? Explain.
2. A guidebook describes the rate of climb of a mountain trail as 120 meters per kilometer. How can you express this as a number with no units?
Disproving a theory requires just one contradicting experiment while proving a theory involves numerous supporting experiments. The mountain trail's rate of climb, 120 meters per kilometer, is expressed as a dimensionless number 0.12 after dividing meters by kilometers. Theory validation is based on predictive success and scientific acceptance, whereas a model's validity can be more limited in scope.
Understanding Theory Validation and Rate Expression
In the context of scientific theories, disproving a theory typically requires only one definitive experiment that provides evidence contradicting the theory's predictions. In stark contrast, proving a theory is a more complex process. A theory cannot be proven in an absolute sense; it can only be supported by a preponderance of evidence. This involves numerous experiments that consistently validate the theory's predictions.
When expressing the rate of climb of a mountain trail, which is described as 120 meters per kilometer, we are dealing with a simple ratio. To express this as a dimensionless number, we divide the number of meters by the number of kilometers, understanding that 1 kilometer equals 1000 meters. The resulting figure is 0.12, which is the gradient or incline of the trail without any units.
The validity of a theory is determined by how well it predicts and explains phenomena in the natural world. Theories are considered more valid if they have been thoroughly tested and widely accepted in the scientific community. For a model to be considered valid, it doesn't need to be universally applicable; it must effectively represent the phenomena for which it was designed. In contrast, a theory is generally expected to have wider applicability.
With all his gear, Neil Armstrong weighed 360 pounds on Earth. When he landed on the Moon, he weighed 60 pounds. Why?
Answer: C.
The gravity on the Moon is less than the gravity on Earth.
Explanation: plato :3
When a force of 20.0N is applied to a spring, it elongates 0.20m. Determine the period of oscillation of a 4.0kg object suspended from this spring
Final answer:
The period of oscillation of a 4.0kg object suspended from a spring when a force of 20.0N elongates it by 0.20m is approximately 1.26 seconds, calculated using the formula T = 2π√(m/k) where k is the spring constant.
Explanation:
The period of oscillation for a mass suspended from a spring depends on the spring constant k and the mass m. The period T is given by the formula T = 2π√(m/k), where m is the mass in kilograms and k is the spring constant in newtons per meter.
To find the spring constant, we use the fact that when a force F is applied to a spring, it stretches by a distance x, and F = kx. Thus, k = F/x. In this case, a force of 20.0N elongates the spring by 0.20m, so the spring constant k is 100 N/m.
With k = 100 N/m and m = 4.0 kg, we can calculate the period T as follows:
T = 2π√(4.0kg / 100 N/m) = 2π√(0.04)
T ≈ 1.26 seconds. Therefore, the period of oscillation of a 4.0kg object suspended from this spring is approximately 1.26 seconds.
A student moves a box of books down the hall
by pulling on a rope attached to the box. The
student pulls with a force of 174 N at an angle
of 35.0 above the horizontal. The box has a
mass of 25.1 kg, and μk between the box and
the floor is 0.25.
The acceleration of gravity is 9.81 m/s2 .
Find the acceleration of the box.
Answer in units of m/s2 ...?
The acceleration of the box can be found by analyzing the forces acting on it. The net force in the horizontal direction is equal to the difference between the applied force and the force of friction. By applying Newton's second law of motion, we can solve for the acceleration of the box, which is found to be 3.94 m/s^2.
Explanation:To find the acceleration of the box, we need to analyze the forces acting on it. The student is pulling the box with a force of 174 N at an angle of 35 degrees above the horizontal. The weight of the box, which is the force due to gravity, can be found using the formula: weight = mass * acceleration due to gravity. In this case, the weight is (25.1 kg) * (9.81 m/s^2) = 245.931 N.
Next, we need to resolve the force applied by the student into horizontal and vertical components. The horizontal component can be found using the formula: F_horizontal = F * cos(angle). In this case, F_horizontal = 174 N * cos(35) = 143.089 N.
The net force acting on the box in the horizontal direction is the difference between the applied force and the force of friction. The force of friction can be found using the formula: force of friction = coefficient of friction * normal force. In this case, the normal force is equal to the weight of the box, so the force of friction = (0.25) * (245.931 N) = 61.483 N.
Finally, we can find the acceleration of the box using Newton's second law of motion, which states that force = mass * acceleration. In this case, the net force acting on the box is F_horizontal - force of friction, so the equation becomes: F_horizontal - force of friction = mass * acceleration.
Plugging in the values, we get: 143.089 N - 61.483 N = (25.1 kg) * acceleration. Solving for acceleration, we find that the acceleration of the box is 3.94 m/s^2.
Final answer:
The acceleration of the box is 5.66 m/s^2
Explanation:
To find the acceleration of the box, we need to split the applied force into horizontal and vertical components. The horizontal component of the force can be found by multiplying the magnitude of the force by the cosine of the angle:
Fhorizontal = 174 N * cos(35.0°) = 142.14 N
With the horizontal force and mass of the box, we can use Newton's second law to calculate the acceleration:
Fhorizontal = m * a
142.14 N = 25.1 kg * a
a = 142.14 N / 25.1 kg = 5.66 m/s2
Therefore, the acceleration of the box is 5.66 m/s2.
The first mechanized industry was
a. mining.
b. transportation.
c. textiles.
d. agriculture.
Why is chemistry important to physical science?
what kind of charges will a sheet of paper have after it has been rubbed with wool , fur, silk?
...?
What force is exerted on a machine?
input force :) k have a good day
1.Which of the following is an example of a second-class lever?
wheelbarrow
broom
crowbar
shovel
2.Which of the following is an example of a first-class lever?
rake
nut cracker
seesaw
elbow joint
Answer : (1) wheelbarrow (2) seesaw
Explanation :
(1) In second- class lever, the fulcrum is at one of the end or we can say the load is in between the effort and the fulcrum. The example of second- class lever is wheelbarrow.
(2) In first- class lever, the fulcrum is in between the applied force or the effort and the load. The example of first class lever is seesaw.
An object starts from rest and falls under the influence of gravity. Draw the distance it has fallen, as a function of time from t=0 to t=5.00. Ignore air resistance.
The distance traveled by an object under the influence of gravity is 4.9t².
Motion of object under the influence of gravity
The distance traveled by an object under the influence of gravity is determined using second equation of motion as follows;
x(t) = v₀t + ¹/₂gt²
x(t) = 0 + ¹/₂gt²
x(t) = 4.9t²
Graph of the distance between t= 0 and t = 5 s
The graph of the motion of the object is presented in the image uploaded.
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The distance fallen by an object under the influence of gravity increases with the square of time. At t=0, the distance fallen is 0. Using the equation d = 0.5 * g * t^2, where g is the acceleration due to gravity, we can calculate the distance fallen at different time intervals.
Explanation:The distance fallen by an object under the influence of gravity can be represented by a quadratic equation. At time t=0, the object starts from rest and its distance fallen is zero. As time increases, the object's distance fallen increases with the square of time.
Let's draw the distance fallen, as a function of time, from t=0 to t=5.00. At t=0, the distance fallen is 0. As time increases, the distance fallen can be calculated using the equation d = 0.5 * g * t^2, where g is the acceleration due to gravity (9.8 m/s^2).
Here is a table representing the distance fallen at different time intervals:
t = 0 s, d = 0 m
t = 1 s, d = 4.9 m
t = 2 s, d = 19.6 m
t = 3 s, d = 44.1 m
t = 4 s, d = 78.4 m
t = 5 s, d = 122.5 m
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The graph in the figure shows the variation of the electric potential V(x) (in arbitrary units) as a function of the position x (also in arbitrary units). Which of the choices below correctly describes the orientation of the x-component of the electric field along the x-axis?
A. Ex is positive from x = -2 to x = 0, and negative from x = 0 to x = 2.
B. Ex is negative from x = -2 to x = 0, and positive from x = 0 to x = 2.
C. Ex is negative from x = -2 to x = 2.
D. Ex is positive from x = -2 to x = 2.
The electric field Ex along the x-axis is positive from x = -2 to x = 0, and negative from x = 0 to x = 2, as determined by the change in electric potential V(x) with respect to position x.
Explanation:The orientation of the electric field Ex along the x-axis is determined by the change in electric potential V(x) with respect to position x. According to the relationship between electric potential and electric field, if the electric potential decreases with increasing x, the electric field is positive, and vice versa. Hence, if we consider the given options, the correct answer should be Option A: Ex is positive from x = -2 to x = 0, and negative from x = 0 to x = 2.
This is because for a positive electric field, the electric potential decreases with increasing position x, which corresponds to the behavior from x = -2 to x = 0. Similarly, a negative electric field corresponds to an increasing electric potential with increasing x, which aligns with the behavior from x = 0 to x = 2.
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Which of the following best summarizes Dalton's atomic theory?
A. All matter is made of the same type of atoms.
B. All matter is made of atoms that may change the way in which they are combined during a chemical reaction.
C. All matter is made of atoms and atoms of one type of matter do not combine with atoms of other types of matter.
Which of the following best summarizes Dalton's atomic theory?
A. All matter is made of the same type of atoms.
B. All matter is made of atoms that may change the way in which they are combined during a chemical reaction.
C. All matter is made of atoms and atoms of one type of matter do not combine with atoms of other types of matter.
Answer:
B. All matter is made of atoms that may change the way in which they are combined during a chemical reaction.
Explanation:
Dalton stated that all matter has atoms which are the indestructible building blocks of matter.
Different types of substances have different types of atoms. The atoms vary in shape and size.
Compounds are substances which are formed by the combination of elements. They are formed by chemical processes.
Compound have a mixture of different atoms in a specific ratio.
In any energy transformation, there is always some energy that gets wasted as non-useful heat.
True
False
In any energy transformation, there is always some energy that gets wasted as non-useful heat.
True
False
The answer is true.
Mountains formed by two colliding continents often contain marine _______ rock. A. sedimentary B. igneous C. metamorphic D. limestone
The correct answer is;
A. sedimentary
Mountains formed by two colliding continents often contain marine SEDIMENTARY rock.
Explanation:
This suggests that if they strike, regularly mounts come from out of the sea and actuate vertically up. This indicates that sedimentary marine rocks ultimately become non-marine rocks because they're not in the sea anymore so they can be located on before-mentioned mountains.
Mountains formed by two colliding continents often contain marine SEDIMENTARY rock.
Which of the following medicinals are utilized to help reduce pain?
A. Tranquilizers
B. Analgesics
C. Insulin injectables
D. Sulfonamides
B. Analgesics are used to reduce pain
When an astronaut in orbit experiences apparent weightlessness,
a. no forces act on the astronaut.
b. no gravitational forces act on the astronaut.
c. the net gravitational force on the astronaut is zero.
d. the net gravitational force on the astronaut is not balanced by a normal force.?
D. The net gravitational force on the astronaut is not balanced by a normal force
When an astronaut in orbit experiences apparent weightlessness, the net gravitational force on the astronaut is not balanced by a normal force.
Explanation:When an astronaut in orbit experiences apparent weightlessness, the correct option is d. the net gravitational force on the astronaut is not balanced by a normal force. In orbit, the astronaut is still under the influence of gravity, but they are constantly falling towards the Earth due to their orbital velocity. This creates the sensation of weightlessness as the astronaut and their spacecraft are in freefall around the Earth.
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Compared to fossil fuels, conserving water is not very important.
True or false
the answer is the second option false
Answer:
false
Explanation:
Scientists use the Celsius scale as the metric unit of temperature. t/f
Scientists use the Celsius scale as the metric unit of temperature.
True, scientists primarily use the Celsius scale in many scientific contexts for temperature measurements. The Kelvin scale is also commonly used for absolute temperature measurements.
The greenhouse effect on which planet makes it the hottest planet in our solar system?
a. jupiter
b. venus
c. mercury
d. mars
Is metallic wire carrying current charged or electrically neutral? Justify. ...?
Explain how does distance affect gravitational force
Final answer:
Distance profoundly influences gravitational force as it changes inversely with the square of the distance between two objects. The gravitational force weakens significantly when the distance is increased, following Newton's universal law of gravitation.
Explanation:
Distance has a crucial impact on the gravitational force. According to Newton's universal law of gravitation, the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This implies that if the distance between two objects doubles, the gravitational force between them becomes one-quarter as strong, following an inverse square relationship.
For example, if we consider two galaxies, the gravitational attraction between them is governed by the same principle. The greater the distance (r), the weaker the gravitational pull between the two galaxies. In the case of celestial bodies like a red giant star expanding, points on its surface get farther from the center of gravity, resulting in a decrease in the gravitational pull at those points.
Newton's insights allowed us to understand that the gravitational force drops to zero only at an infinite distance, which is why objects in the universe, no matter how far apart, still exert some gravitational influence on each other, although it becomes increasingly weaker with distance.
Friction is generated when ______ interfere with each other on sliding surfaces. ...?
Answer:
its molecules
Explanation:
Calculate the wavelength of the radiation released when an electron moves from n=5 to n=2
The wavelength of the radiation released when an electron moves from the n=5 to n=2 orbit is calculated using the Rydberg formula, resulting in a wavelength of 536 nm.
Explanation:To calculate the wavelength of the radiation released when an electron moves from the n=5 to the n=2 energy level, we can apply the Rydberg equation. In this case, n1 would represent the lower energy level (2), and n2 would represent the higher energy level (5). The Rydberg formula for wavelength is 1/λ = R (1/n1² - 1/n2²), where R is the Rydberg constant (approximately 1.097x10^7 m-1).
When we substitute our given values into this formula we find:
1/λ = R (1/2² - 1/5²)1/λ = (1.097x10^7 m-1) (1/4 - 1/25)1/λ = (1.097x10^7 m-1) * 0.17 1/λ = 1.865x10^6 m-1So, λ = 1/1/λ = 5.36 x 10^-7 m or 536 nm.
This represents the energy difference between the two levels as expressed through the wavelength of the emitted photon when the electron makes a transition from n=5 to n=2.
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To find the wavelength of radiation when an electron transitions from n=5 to n=2 in a hydrogen atom, use the Rydberg formula. After calculations, the wavelength is found to be approximately 434 nm.
This question relates to the calculation of the wavelength of the radiation emitted by a hydrogen atom when an electron transitions from the n=5 energy level to the n=2 energy level. We use the Rydberg formula for this calculation:
1/λ = R_H (1/n₁² - 1/n₂²)
where λ is the wavelength, R_H is the Rydberg constant (approximately 1.097 x 10⁷m⁻¹) n1 is the lower energy level, and n2 is the higher energy level. For this specific transition, n1=2 and n2=5.
Insert the values into the formula:1/λ = 1.097 x 10⁷m⁻¹ (1/2² - 1/5²)1/λ = 1.097 x 10⁷m⁻¹ (1/4 - 1/25)1/λ = 1.097 x 10⁷m⁻¹ (0.25 - 0.04)1/λ = 1.097 x 10⁷m⁻¹ (0.21)1/λ = 2.3037 x 10⁶m⁻¹ Finally, invert this result to find the wavelength λ:λ = 1 / 2.3037 x 10⁶m⁻¹ ≈ 4.34 x 10⁻⁷m or 434 nmThus, the wavelength of the radiation released is approximately 434 nm.
Gravity is a force that helps to hold the universe together.true or false
Answer:
True
Explanation:
Gravity is a force that helps to hold the universe together. The statement is true. The gravitational force is always attractive in nature. It depends on the masses and the distance between them. Mathematically, it is given by :
[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]
Where
G = universal gravitational constant
m₁ and m₂ are masses
d is the distance between them
Gravity is responsible to hold the planets in an orbit around the sun. Ocean tides are also caused due to gravitational pull of the moon. If gravity is not present in the universe then there would be no moon, no stars etc.
Hence, the given statement is true.