D) The system has external forces, such as friction and air resistance, acting on it.
According to Newton's first law, a change in motion is brought about by a net external force. External forces are forces that originate outside of an object or system and operate on it. Internal forces are generated within the studied system and do not result in acceleration. As a result, while analyzing an object's motion, we only take into account the exterior forces that cause it to accelerate, ignoring the interior forces.
The applied force, normal force, tension force, friction force, and air resistance force are examples of external forces. The internal forces, however, also include gravitational, magnetic, electric, and spring forces. A greater acceleration results from a greater net external force. The system's acceleration would thus be inversely proportional to the system's net external force.
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Question 1 of 20
Calculate: (9 x 10^8) divided (3 x 10^4) =
A. 6 x 10^4
B. 3 x 10^4
C. 3 x 10^4
D. 6 x 10^2
A ball is dropped. Assuming free fall, what is its initial speed?
For any freely falling item, the acceleration in the kinematic equations is -9.8 m/s/s, whether or not this is explicitly stated.
The supplied problem informs us that a ball was dropped and is supposed to be falling freely. Since the problem does not specify whether any other forces were present to influence the ball's motion, we must assume that the initial speed is v0=0 m/s.
Free-falling accelerates at a rate of 9.8 m/s2, which is referred to as the acceleration owing to gravity because it is being drawn towards the center of the earth. This indicates that a=9.8m/s2 is the value of the initial and final accelerations.
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Limestone bedrock can weather and dissolve. The erosion of the limestone can result in all the following landforms except
Caverns
Ridges
Sinkholes
Underground waterways
The erosion of the limestone can result in all the following landforms except ridges.
weather -
Climate is the average weather condition of a place. It refers to the way in which the weather of a place stays over a given period of time. The weather condition of a place is known to change from time to time.Limestone - It is type of minerals that could occur at a given place.
The presence of the limestone in a place is able to change or alter the landform or the arrangement of the land in a given area.
Some of these changes are very much significant and can be easily observed in an area where there is a Limestone bedrock. Landforms could be a characteristic of a place and we know that it could be used to identify a given area.
The erosion of the limestone can result in all the following landforms except ridges.
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Answer:
B. Ridges
Explanation:
Proof shown below
A 0.25 kg length of aluminum wire is warmed 10.0°C by an electric current. How much heat was generated by the current?
2,302.74 J is the heat generated.
Current electricity is the electricity produced by the movement of electrons. Static electricity is the electricity that accumulates on a substance's surface. Power plants and batteries are used to produce the current electricity.
Electric current in a wire, where electrons serve as the charge carriers, is a measurement of the amount of charge that moves through any point of the wire in a given amount of time.
The mass of the aluminum is m = 0.25 kg.
The difference in temperature is T=10 C.
The following is a list of aluminum's specific heat capacities:
c=921.096 J/kg∘C
Therefore, we apply the following formula in this instance:
Q=mcΔT
We replace with:
Q=(0.25kg)(921.096J/kg∘C)(10∘C)
Thus, we will receive the heat produced:
Q=2,302.74 J
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What is the relationship between potential energy and
gravity?
A. Gravity has nothing to do with potential energy
B. Potential energy is the same thing as gravity
C. Objects in motion can be stopped by gravity
D. Objects have the potential to fall due to gravity
Answer:
D
Explanation:
the amount of potential energy is dependents on the weight and the hight and gravitational energy being forced onto a object.
How does the mass of an object affect the potential and kinetic energy?
Answer:
The more mass the more kinetic energy it has
Explanation:
like a plastic ball and a metal one the metal one will fall faster.
hope this helps
A Ferris wheel with radius 14.0 m is turning about a horizontal axis through its center, as shown in the figure below. (Figure 1)The linear speed of a passenger on the rim is constant and equal to 6.00 m/s .
The centripetal acceleration of the Ferris wheel with radius of 14.0 m is determined as 2.57 m/s².
What is centripetal acceleration?Centripetal acceleration, is the acceleration of a body moving a circular path.
The centripetal acceleration of the Ferris wheel is calculated as follows;
a = v²/r
where;
v is the linear speedr is the radius of the circular patha = (6²) / (14)
a = 2.57 m/s²
Thus, the centripetal acceleration of the Ferris wheel is determined as 2.57 m/s².
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The complete question is below:
A Ferris wheel has a radius of 14 m, the linear speed of a passenger on the rim is 6 m/s .Find the centripetal acceleration of the Ferris wheel.
(a) When an object's acceleration vector points in the same direction as its velocity, which of the following is true?
A. the object speeds up without turning.
B. the object slows down without turning.
C. the object turns without changing speed.
A. When an object's acceleration vector points in the same direction as its velocity, the object speeds up without turning.
What is acceleration vector?
The average acceleration vector is defined as the rate at which the velocity changes with time.
When an object is slowing down, the acceleration of the object is in the opposite direction as the velocity.
Also, when an object is speeding up, the acceleration of the object is in the same direction as the velocity.
Thus, when an object's acceleration vector points in the same direction as its velocity, the object speeds up without turning.
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Limestone bedrock can weather and dissolve. The erosion of the limestone can result in all the following landforms except
Caverns
Ridges
Sinkholes
Underground waterways
The erosion of limestone bedrock can result in the formation of all the following landforms except ridges.
Limestone is a type of sedimentary rock that is primarily composed of the mineral calcite (calcium carbonate, CaCO₃). It accounts for around ten percent of the total volume of all sedimentary rocks. This rock is distinguished by the fact that its principal constituent, calcite, is primarily formed by shell-producing and coral-building living organisms. The action of acidic water on limestone deposits has created numerous caverns, gorges, sinkholes, and other natural landforms.
Whereas, a ridge, often known as a mountain ridge, is a geographical feature composed of a series of mountains or hills that form a continuously raised crest over a long distance.
Therefore, the erosion of limestone bedrock can result in the formation of caverns, sinkholes, and underground waterways except for ridges.
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The graph shows the acceleration of a racehorse taking off from a starting gate. By how much did the horse's speed increase between 4 seconds and 6 seconds?
The speed of the racehorse increases by 27m/s.
Speed, expressed in terms of meters per second, is the rate at which an object's location changes. An item moves one meter in one second, for instance, if it starts at the origin and moves three meters in three seconds. A simple division of time by distance yields the equation for speed. To calculate speed, divide the distance traveled (say, 3 meters) by the passing time (say, three seconds) (one meter per second).
Speed is measured as distance moved over time.
Speed = Distance/Time
We can also use these symbols:
Speed = Δs/Δt
Speed is commonly measured in meters per second (m/s or m s-1), or kilometers per hour (km/h or km h-1)
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Which describes the greatest displacement?
A. Walking 3 m east, then 3 m north, then 3 m west
B. Walking 3 m east, then 3 m south, then 3 m east
The flux density between two plates separated by mica of relative permittivity 5 is 2 microColumbs per square meter. Find the voltage gradient between the plates.
According to the given statement The voltage gradient between the plates is 45.2kV/m
What is high voltage gradient?The Volt/meter (V/m) unit of measure for potential gradient is standard. Take a look at the graph between the potential gradient and distance. The potential gradient is strong when the object is close to or at a low distance from the high voltage wire; as you increase the distance, the gradient reduces.
Briefing:Flux Density
D = 2μC/m²
D =2×10⁻⁶ C/m²
ε[tex]_0[/tex] = 8.85 × 10⁻¹² F/m
ε[tex]_r[/tex] = 5
D/E = ε[tex]_0[/tex]ε[tex]_r[/tex] hence voltage gradient
E = D/ε[tex]_0[/tex]ε[tex]_r[/tex]
= [tex]\frac{2 \times 10^{-6}}{8.85 \times 10^{-12} \times 5} \mathrm{~V} / \mathrm{m}[/tex]
= 45.2kV/m
The voltage gradient between the plates is 45.2kV/m
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If a car decreases in speed to a stop from an initial speed of 21 m/s in a period of 13 s, what is the average acceleration of the car? Show all work.
If a car decreases in speed to a stop from an initial speed of 21 m/s in a period of 13 s, the average acceleration is 1.62m/s².
How to calculate acceleration?The acceleration of a moving body can be calculated by dividing the change in velocity (∆V) by the time taken. That is;
a = v - u/t
Where;
a = accelerationv = final velocityu = initial velocityt = timeAccording to this question, a car decreases in speed to a stop from an initial speed of 21 m/s in a period of 13 s. The average acceleration is as follows:
acceleration = 21 - 0/13
acceleration = 1.62m/s²
Therefore, if a car decreases in speed to a stop from an initial speed of 21 m/s in a period of 13 s, the average acceleration is 1.62m/s².
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I need help with part B plsss !!
The time taken for the object to travel the given height is determined as 12.48 seconds.
What is time of motion?
Time of motion of an object is the total time taken by the object to travel a given height or distance.
Time taken for the boulder to reach the groundThe time of motion of the boulder is calculated as follows;
h = vt + ¹/₂gt²
where;
h is the height of fallv is the initial velocityt is the time of motiong is acceleration due to gravity1300 = 43t + 0.5(9.8)t²
1300 = 43t + 4.9t²
4.9t² + 43t - 1300 = 0
solve the quadratic equation using formula method as shown below;
a = 4.9, b = 43, c = -1300
t = 12.48 seconds
Thus, the time taken for the object to travel the given height is determined as 12.48 seconds.
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how to find potential energy
Answer:
The formula for potential energy depends on the force acting on the two objects.
The full moon subtends about 1/2 of an angular degree. How large is that in units of archminutes? Of arcseconds?
The correct answer is to describe an object's perceived size and describing its position in space. Degrees (°) are used to express angles. A complete circle has 360 °, whereas a straight angle has 90 °. For instance, there is a 90° angle between the horizontal direction (toward the horizon) and the vertical direction (directly above you). The full moon's angular diameter in the sky is around 1/ 2°.
Triangle Units
Divide a complete circle into 360 degrees. Divide a degree into 60 arcminutes, also known as minutes of arc (abbreviated as 60 arcmins or 60'). Divide an arcminute into 60 arcseconds, also known as seconds of arc (abbreviated as 60 arcsec or 60).
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An automobile and train move together along parallel paths at 28.8 m/s. The automobile then undergoes a uniform acceleration of −4 m/s^2 because of a red light and comes to rest. It remains at rest for 63.8 s, then accelerates back to a speed of 28.8 m/s at a rate of 1.58 m/s^2.
How far behind the train is the automobile
when it reaches the speed of 28.8 m/s, assuming that the train speed has remained at 28.8 m/s?
Answer in units of m.
2197 m far behind the train is the automobile when it reaches the speed of 28.8 m/s, assuming that the train speed has remained at 28.8 m/s
s₁=v²/2a₁=28.8²/2•4=103.7 m.
Automobile:
s=s₁+s₃=103.7+262.5=366.2
t= t₁+t₂+t₃=7.2+63.8+18.2 = 89 s.
Train:
S=v •t=28.8•89=25 63.
Δs=S-s =2563.2-366.2=2197 m
In physics, what does kinematics mean?
The study of motion in a system of bodies is called kinematics, which does not directly take into account the forces or potential fields influencing the motion. In other terms, kinematics investigates the distribution of momentum and energy among interacting entities.
Understanding the causes of various motions of an item, such as rotational motion in which the object receives force or torque, is the main goal of kinetics. The definition of concepts like acceleration, velocity, and location of objects is provided by kinematics.
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The speed of sound is 344 m/s. You have built a really fantastic car that can really go fast. If the car can accelerate at 22.4 m/s how much time till you reach the speed of sound? How many kilometers will you travel before you reach that speed?
Answer:
About 15 seconds,.344 kilo
Explanation:
Answer:
15.36 [sec]; 2.64143 [km].
Explanation:
all the details are in the attachment, note, the suggested solution consists of two parts: formula and solution.
A 232g ball hangs on the end of a spring. When the spring is pulled down it oscillates with a period of .13s. When pull down too far to a point .56m below the equilibrium position, the ball flies off the spring when it reaches its equilibrium position, and flies into the air.
Find the spring constant
Find the height the ball reaches.
The spring constant is 542 N/m.
The height the ball reaches is 37.5 m.
Angular speed of the ball
The angular speed of the ball is calculated as follows;
ω = 2π/T
ω = (2π) / (0.13)
ω = 48.33 rad/s
Spring constantThe spring constant is calculated as follows;
ω = √(k/m)
ω² = k/m
ω²m = k
(48.33² x 0.232) = k
542 N/m
Linear speed of ballv = ωL
v = 48.33 x 0.56 m
v = 27.1 m/s
Height reached by the ballh = v²/2g
h = (27.1²) / (2 x 9.8)
h = 37.5 m
Thus, the spring constant is 542 N/m.
The height the ball reaches is 37.5 m.
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After an experiment, research participants are told its purpose and about any deception they may have experienced. This is called
a. replication.
b. the double-blind procedure.
c. debriefing.
d. informed consent.
After an experiment, research participants are told its purpose and about any deception they may have experienced. This is called debriefing. So, the correct option is (c).
Debriefing is the act of reporting on a mission, project, or the data gleaned from it. After an activity or event, a structured procedure examines the actions performed.Debriefing is a methodical learning procedure created to help plans continually improve as they are being carried out.
Debriefing can be used as an example during an experiment when the researchers required to use some type of deception for the purpose of the study.
Debriefing has its roots in the military as a technique to learn quickly in rapidly changing situations and to correct mistakes or changes on the field. In this instance, the researchers would describe their reasoning for deception and the goal of the study during the debriefing session.
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The precise way a researcher measures and defines a variable is know as the
The precise way a researcher measures and defines a variable is known as the operational definition.
The researcher measures the dependent variable and the independent variable is manipulated and controlled by the researcher ( Experimenter ). The concept of operational definition is applied in various fields such as Philosophy, Science, Business, computing etc.
To explain this clearly, let's consider an example in which the researcher tries to define sleep deprivation. In this sleep deprivation is the independent variable and factors causing sleep deprivation such as food, lifestyle, etc are dependent variables.
Therefore, the precise way a researcher measures and defines a variable is known as the operational definition.
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Most doctoral programs in psychology require extensive study
of:
A master's thesis and a dissertation are typically required for clinical psychology programs. Each of these typically takes one to two years.
Psychology doctoral degrees provide students with the training they need to pursue careers in academic research, professional practice, or both. The most common academic degrees awarded are the Doctor of Philosophy (PhD) or the Doctor of Psychology (PsyD). There are notable disparities between the types of training and professional goals of those with these degrees, even though each is intended to engage students in deep knowledge and abilities within an area of psychology. Understanding these variations is the first step in determining which curriculum is the greatest fit for a particular student.
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A fighter hits a punching bag and brings it from rest up to a speed of 40 m/s in 0.08 s. What is the force of impact on the punching bag if its mass is 100 kg?
if a fighter hits a punching bag and brings it from rest up to a speed of 40 m/s in 0.08 s, Then the force of impact on the punching bag if its mass is 100 kg would be 50000 Newtons,
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
The impact of the force on the punching bag = momentum/time
=100×40 / 0.08
=5000 Newtons
Thus, the force of impact on the punching bag would be 50000 Newtons.
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What equation is used to determine the total power consumption in a series circuit?
Answer:
PN=P1+P2+P3.......................PN
The distance between the sun and the Earth is about 1.5 x 10¹1 m. Express
this distance in terameters (Tm) and kilometers.
Answer: 0.15 Tm, 150000000 km
Explanation:
150,000,000,000m to km=150000000 km (divide by 1000)
150,000,000,000m to Tm=0.15 Tm
Physics students in a laboratory experiment use a Free-Fall apparatus to determine the acceleration of the gravity, g (as in Fig (a)). The student applies one of the kinematic equations: s=ut+1/2gt2 (where the acceleration, a=g) and decides to rearrange the equation such that in his experiment, he alters the values of the falling distance s (in m) and records the corresponding falling times t (in seconds). In his approach, he decides to plot (on y−axis) 2s/t against t and obtains the following graph (as in Fig (b).) Which of the following best represents the value of the y−intercept (indicated in Fig (b).)?
Select one:
A.
ut
B.
2ut
C.
2s
D.
2u
Answer:
I think it's B but I'm not 100% sure
If a ball is thrown straight upward with an initial velocity of 30.0 m/s, how
much time does it table to reach its maximum height?
(A) 1.0 s
(B)1.4 s
(C)1.5 s
(D) 3.0 s
The time taken by the ball to reach the maximum height when ball is thrown straight upward is t = 1.5s.
Equation :To find the time we must know the distance so to calculate the distance using formula,
v² = u² + 2 as
where,
v is final velocity
u is initial velocity
a is acceleration due to gravity
s is distance
As, we can see,
u = v = 30m/s
a = - 9.8 m/s²
s = ?
So, putting the values we get,
30²m/s = 30²m/s + 2 (9.8 m/s²) s
s = 30²m/s / 30²m/s + 2 (-9.8 m/s²)
s = 19.6
Now after getting to know the distance we can use the formula,
s = d/t
Where,
s is speed
d is distance
t is time
So, putting the values,
t = 30 / 19.6
t = 1.5s
Hence, the time taken by the ball to reach the maximum height is 1.5s.
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Can someone explain the question below by giving me an example with numbers? I'm confused about how to approach the question.
The diagram of the problem is in the picture attached and the question is: What is the magnitude of static frictional force that must act on box 2 in terms of F, the magnitude of F, m1, m2, µk and g?
Answer: kfhfjffhfjfvfh.
Explanation: hfhvfffhfhf.
100 m/s northwest express what type movement
Answer:
There is more to motion than distance and displacement. Questions such as, “How long does a foot race take?” and “What was the runner’s speed?” cannot be answered without an understanding of other concepts. In this section we will look at time, speed, and velocity to expand our understanding of motion.
A description of how fast or slow an object moves is its speed. Speed is the rate at which an object changes its location. Like distance, speed is a scalar because it has a magnitude but not a direction. Because speed is a rate, it depends on the time interval of motion. You can calculate the elapsed time or the change in time, Δt, of motion as the difference between the ending time and the beginning time
The SI unit of time is the second (s), and the SI unit of speed is meters per second (m/s), but sometimes kilometers per hour (km/h), miles per hour (mph) or other units of speed are used.
When you describe an object's speed, you often describe the average over a time period. Average speed, vavg, is the distance traveled divided by the time during which the motion occurs.
vavg=
distance
time
You can, of course, rearrange the equation to solve for either distance or time
time =
distance
vavg
.
distance = vavg × time
Suppose, for example, a car travels 150 kilometers in 3.2 hours. Its average speed for the trip is
vavg =
distance
time
=
150 km
3.2 h
47 km/h.
A car's speed would likely increase and decrease many times over a 3.2 hour trip. Its speed at a specific instant in time, however, is its instantaneous speed. A car's speedometer describes its instantaneous speed.
Explanation:
Question 3: Vectors (13 points)
a. Draw the two vectors below added together. Then draw the sum of the two
vectors. (1 point)
The sum of the vectors is shown in the image attached to this answer.
What is a vector?A vector quantity is a quantity that has both magnitude and direction. In effect, as we try to obtain the combination of the vector we also have to consider the direction. The vectors are often shown by the use of a bold face or by the use of an arrow over the sign of the vector.
Now looking at this vectors, we know that the sum of the vectors can only be obtained geometrically but the arrows of the vectors must have to point in the appropriate directions for the correct sum to be obtained.
Thus the sum of the vectors is shown in the image attached to this answer.
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