Answer:
78.4 J
Explanation:
Given:
Mass of the object (m) = 2.0 kg
Height or displacement of the mass (h) = 4.0 m
Now, change in gravitational potential energy (ΔU) = ?
Change in gravitational potential energy of an object is the energy stored by the object when it is raised to some height above the reference ground level.
Change in gravitational potential energy of an object of mass 'm' raised to a height 'h' above the ground is given as:
[tex]\Delta U=mgh[/tex]
Where, 'g' is the acceleration due to gravity and has a value of 9.8 m/s².
Now, plug in all the given values and solve for ΔU. This gives,
[tex]\Delta U=(2.0\ kg)(9.8\ m/s^2)(4.0\ m)\\\\\Delta U=78.4\ J[/tex]
Therefore, the change in gravitational potential energy is 78.4 J.
The change in gravitational energy when a 2.0 kg mass is lifted 4.0 m above the ground is [tex]\(78.4 \, \text{J}\)[/tex].
The change in gravitational potential energy [tex](\(\Delta U\))[/tex] when a mass \(m\) is lifted to a height [tex]\(h\)[/tex] is given by the formula:
[tex]\[\Delta U = m \times g \times h\][/tex]
where:
[tex]\(m\)[/tex] is the mass of the object (in kilograms),
[tex]\(g\)[/tex] is the acceleration due to gravity (approximately [tex]\(9.8 \, \text{m/s}^2\)[/tex] on Earth),
[tex]\(h\)[/tex] is the height above the ground (in meters).
Given:
[tex]\(m = 2.0 \, \text{kg}\)[/tex]
[tex]\(h = 4.0 \, \text{m}\)[/tex]
[tex]\(g \approx 9.8 \, \text{m/s}^2\)[/tex]
Plugging in the values:
[tex]\[\Delta U = 2.0 \, \text{kg} \times 9.8 \, \text{m/s}^2 \times 4.0 \, \text{m}\][/tex]
[tex]\[\Delta U = 78.4 \, \text{kg} \cdot \text{m}^2/\text{s}^2\][/tex]
Since [tex]\(1 \, \text{kg} \cdot \text{m}^2/\text{s}^2\)[/tex] is equivalent to [tex]\(1 \, \text{Joule}\) (J)[/tex], the change in gravitational potential energy is:
[tex]\[\Delta U = 78.4 \, \text{J}\][/tex]
Which option correctly identifies the graph that represents an object increasing its position with a constant velocity and describes why?
A --It is Graph D because a vertical line indicates the object is increasing its position, and a straight line means it is moving with a constant velocity.
B--It is Graph C because curving upward indicates the object is increasing its position, and a positive slope means it is moving with a constant velocity.
C--It is Graph A because a horizontal line indicates the object is moving with a constant velocity, and the positive value means it is increasing its position.
D--It is Graph B because a straight, diagonal line indicates the object is moving with a constant velocity, and a positive slope means it is increasing its position.
Answer: D
Explanation:
The graph that represents an object increasing its position with a constant velocity is Graph B because a straight, diagonal line indicates the object is moving with a constant velocity, and a positive slope means it is increasing its position. Hence, option (D) is correct.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Mathematically:
velocity = ( final position - initial position)/time interval
Hence,
Final position = initial position + velocity ×time interval
Hence, the x-t graph of a object with constant velocity, is linear in nature with a positive slope. Hence, graph (B) is the correct option.
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A rocket, weighing 4.36 x 10^4 N, has an engine that provides an upward force of 8.90 x 10^5 N. It reaches a maximum speed of 860 m/s. What is the NET force on the rocket
The net force on the rocket is 846400 N.
Answer:
Explanation:
It is known that weight is the influence of gravitational force acting on any mass of the object. So in the present case, the weighing force given is equal to the gravitational force acting on the rocket. Thus, the gravitational force will be acting towards downward direction. But an upward force is required by the rocket for thrusting purpose and that force is given as upward force. So the net force acting on the rocket is the vector addition of all the forces acting on the rocket. As in this case, only upward and downward force is acting on the rocket. The vector addition will be equal to subtraction of downward acting gravitational force from upward force or force provided by engine.
Net force = Engine force - Gravitational force = 890000-43600=846400 N
So the net force acting on the rocket is 846400 N.
Final answer:
The net force on the rocket is the difference between the upward thrust and the weight of the rocket. However, once the rocket reaches constant velocity, the net force is zero, assuming no changes in other forces acting on the rocket.
Explanation:
The net force on the rocket can be calculated using Newton's second law of motion, which states that the net force is equal to the mass times acceleration (F = ma). To find the net force, the weight of the rocket (gravitational force acting downward) needs to be subtracted from the upward thrust provided by the engine.
Fnet = Fthrust - Fweight
If we are not given the mass of the rocket or information about changes in the velocity to calculate acceleration, it's assumed that the rocket is in a constant velocity phase of its flight, meaning the net force equals to zero, since acceleration is zero. If acceleration were to be considered, it would've been calculable only with additional information pertaining to the time it takes to reach that velocity or change in velocity over time.
In the example provided, the weight of the rocket is 4.36 x 104 N and the thrust is 8.90 x 105 N. Once the rocket reaches its maximum speed, the acceleration is zero, and therefore the net force should also be zero as it will be cruising at a constant speed, provided there is no change in the forces acting on the rocket.
Look at the data table and graph for the 50-coil electromagnet. With the 1.5 V battery, the electromagnet picked up an average of 13 paper clips, while the 25-coil electromagnet picked up an average of 6 paper clips.a.What is the ratio of the number of turns of the 50-turn electromagnet to the number of turns of the 25-coil electromagnet? b.What is the approximate ratio of the number of paper clips pickedup by the 50-coil electromagnet?
1) The ratio between the number of turns of the two electromagnets is 2
2) The ratio between the number of paper clips picked up is 2.2
Explanation:
1)
An electromagnet is a device consisting of a coil of wire wrapped around an iron core. Such a device is able to create a magnetic field, and in this problem this is used to attract and pick up the paper clips.
In this problem, we have two electromagnets:
- The first one has 50 turns
- The second one has 25 turns
Therefoore, the ratio of the number of turns of the 50-turn electromagnet to the number of turns of the 25-coil electromagnet is:
[tex]\frac{N_1}{N_2}=\frac{50}{25}=2[/tex]
2)
The strength of the magnetic field produced by an electromagnet is directly proportional to the number of turns in the coil wrapped on the electromagnet:
[tex]B\propto N[/tex]
This means that the electromagnet with more turns will produce a stronger magnetic field, and therefore it will be able to pickup more paper clips.
In this problem, in fact:
- The electromagnet with 50 turns can pick up 13 paper clips
- The electromagnet with 25 turns picks up 6 paper clips
Therefore, the ratio of the number of paper clips picked up is:
[tex]\frac{p_1}{p_2}=\frac{13}{6}=2.2[/tex]
And we see that this ratio is approximately equal to the ratio of the number of turns, which is 2.
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What is the value of x in the equation Ix - 3y = 30, when y = 15?
Answer: x= 75
Explanation:1x -3y = 30
And y = 15
Substitute y accordingly into the equation, so that
x - 3(15) = 30
x-45=30
Add 45 to both sides if the equation
x-45+45=30+45
x=75
Explain why a reference points that are stationary are usually chosen to determine whether an object is in motion.
Answer: Stationary reference points are used to determine if a object is in motion because if the reference point is still,you will be able to see if the object is in motion. If you had a reference point that wasn't stationary, you wouldn't be able to tell if the object was in motion.
Explanation:
Stationary reference points are used to determine if a object is in motion because if the reference point is still,you will be able to see if the object is in motion. If you had a reference point that wasn't stationary, you wouldn't be able to tell if the object was in motion.
Choosing a stationary reference point is important to determine motion because motion is relative and can appear differently from different reference frames.
Explanation:A stationary reference point is usually chosen to determine whether an object is in motion because motion is a relative term. When we observe motion from a reference point that is stationary, we can easily identify the displacement and velocity of the object. For example, if we are in a car that is moving at a constant velocity, it may be difficult to determine whether an object inside the car is moving or not. However, if we observe the same object from outside the car, from a stationary reference point, we can clearly see whether it is in motion or not.
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What is the gravitational force exerted on an object called?
Answer:
mass
Explanation:
The gravitational force exerted on an object is called its weight. Weight can change based on the strength of the gravitational pull where the object is located. The weight is calculated by multiplying the object's mass by the gravitational acceleration.
Explanation:The gravitational force exerted on an object is referred to as the object's Weight. This should not be confused with Mass, which is a measure of the amount of matter in an object and remains constant regardless of an object's location. Weight, however, can change depending on the gravitational pull of the surroundings. For instance, an object would weigh less on the moon than on Earth due to the moon's weaker gravitational pull.
Calculating the weight of an object is done by multiplying the mass of the object by the gravitational acceleration (approximately 9.8 m/s^2 on Earth). The typical unit of weight in the International System of Units (SI) is the Newton (N).
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3. If 2 J of wok is done in raising a 180 g apple, how far is it lifted?
Answer:
1.13m
Explanation:
From the question, we obtained the following information:
W = 2J
m = 180g
We must convert this gram (i.e 180g) to kg
1000g = 1Kg
180g = 180/1000 = 0.18kg
g = 9.8m/s2
h =?
w = mgh
h = w / mg
h = 2 / ( 0.18x9.8)
h = 1.13m
1) When you take a turn to the left in a car, you feel "thrown" to the right. Explain, using the
language of Newton's first law, how it is incorrect to say a force is responsible for this feeling.
Finish up by explaining what's actually going on.
2) Newton's third law states that for each force acting on a body (action), there is a force of
equal magnitude and opposite direction (reaction) acting on whatever generates the force on the
body. What is the reaction force to your weight?
Explanation:
1) Newton's first law of motion states: "an object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force."
When you're riding in a car, your body is moving forward. When the car turns left, your inertia keeps you moving forward. This means the car moves left from underneath you, which makes it feel like you're moving to the right, even though there's no net force pushing you.
2) When you're standing on the ground, the Earth's gravity pulls on you with a force equal to your weight. You push back on the Earth with an equal and opposite force called "normal force".
If you need some help working through family problems, who would be the best choice to seek it from?
clinical psychologist
counseling psychologist
sociocultural psychologist
developmental psychologist
Answer:
counseling psychologist
PLZ HELP 150 POINTS AND BRAINLIEST
If effort is applied to the wheel, the axle turns with more _______.
If effort is applied to the axle, the wheel turns ______ and ______ than the axle.
The road wheel on a car multiply the _______ of the rear axle.
Applying a light force to turn the steering wheel of a car produces a strong force on the _________.
Answer:
A wheel and axle may either increase or decrease the input force, depending on whether the input force is applied to the axle or the wheel. ... Because the output force is less than the input force, the mechanical advantage is less than 1. However, the wheel turns over a greater distance, so it turns faster than the axle.
If you apply a force to the wheel (the handle), the wheel spins and multiplies the effort to make the output force of the axle (shaft) greater.
The drive shaft, which on most cars runs the length of the vehicle to the rear wheels, turns as the combustion engine burns gasoline. The turning drive shaft sends power to the rear axle and wheels, which cause them to turn as well, moving the car forward
There some moments when the steering wheel becomes stiff and hard to turn. From irregular servicing, lack of fluid oil to low tyre pressure or bad wheel alignment, any of these could be the cause
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⚠Heeeeleleleeleleppppp⚠
Which phrase describes conduction?
A.Transfer of heat by the actual movement of warmed matter.
B.Transfer of heat between two objects that are touching.
C.The process in which energy is released by molecules breaking apart.
D.The process in which energy is emitted by one object, transmitted through space, and absorbed by another.
Yo sup??
the correct answer is option B ie
B. transfer of heat between two objects that are touching .
Hope this helps.
Mercury, Venus, and Earth are the three planets closest to the Sun. The force of gravity on the surface of each planet is different. Which of the following places these three planets in order from greatest surface gravity to least?
A.
Mercury, Venus, Earth
B.
Earth, Venus, Mercury
C.
Earth, Mercury, Venus
D.
Venus, Earth, Mercury
Answer:
B. Earth, Venus, Mercury
Explanation:
solve these please I really need help
The correct answer for 5 is Electrons
Look at the incomplete equation below. What does E k Represent?
Answer:
The kinetic energy
Explanation:
The value of Ek represents the kinetic energy of a body and it is defined by the following equation
[tex]E_{k}=\frac{1}{2} *m*v^{2} \\[/tex]
where:
m = mass [kg]
v = velocity [m/s]
Ek = kinetic energy [J]
The equation [tex]\rm \(E_k = \frac{1}{2} m \times v^2\)[/tex] represents the kinetic energy [tex]\rm (\(E_k\))[/tex] of an object in motion. In this equation, [tex]\rm \(m\)[/tex] represents the mass of the object, and [tex]\rm \(v\)[/tex] represents its velocity.
Kinetic energy is the energy an object possesses due to its motion. The term [tex]\rm \(\frac{1}{2} m \times v^2\)[/tex] calculates the kinetic energy by taking half of the product of the object's mass and the square of its velocity.
As an object's speed increases, its kinetic energy also increases, and kinetic energy is directly proportional to both the mass and the square of the velocity of the object.
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What is the mechanical energy of a 1-kg ball that is rolling on the ground at 2 m/s?
A) The Ball is on the ground, so the mechanical energy is zero
B) 1J
C) 2J
D) 4J
NEED ANSWER ASAP
I will mark the answer brainliest
I literally copied the quiz
Answer:
c. 2 J
Explanation:
since u just multply it
I need help with this problem. It’s calculating net force.
Answer:
The net force on the frog is zero Newton.
Explanation:
Balance forces are 2 forces that is acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving continues to move at the same speed and in the same direction
In Figure , the forces exerted on the frog is equal in magnitude and opposite in direction.
Hence
The force , F1 = 200 N and F2 = -200 N since it is acting in opposite direction
Now the net force =F1 + F2 = 200 - 200 = 0
Describe what is meant by “a constant change of direction”. Identify whether the examples provided
show a constant change of direction when moving. (S8P3a)
a. A merry-go-round spinning in circles.
b. A wind vane swinging around.
c. A kid walking on a straight path.
A constant change of direction implies ongoing alterations in the course of movement, typically involving centripetal acceleration. A merry-go-round and a wind vane demonstrate this, while a kid walking straight does not.
"A constant change of direction" refers to a situation where an object or point is continually altering the course of its movement. In the context of physics and motion, this typically indicates the presence of centripetal acceleration, which is the acceleration directed towards the center of a circular path that keeps an object moving in a curve rather than a straight line.
A merry-go-round spinning in circles displays a constant change of direction due to the rotational movement with each point on the ride continuously changing its direction as it moves in a circle.
A wind vane swinging around also shows a constant change of direction as it repeatedly changes which way it's pointing due to shifting wind directions.
A kid walking on a straight path does not exhibit a constant change of direction because the motion is linear and not curved.
which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean
Which changes?
Explanation:
What are your options?
the force is the sum of all the forces that act upon an object
Answer:
net force
Explanation:
The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
Volume (mL) Mass (g)
200 180
300 270
400 360
A liquid of unknown density is studied. Based on the data, what is the density of the liquid?
Group of answer choices
A 1.1 mL/g
B 0.9 mL/g
C 1.1 g/mL
D 0.9 g/mL
Answer:
A. 1.11[mL/g]
Explanation:
We have to remember the expression to calculate the density, which says it's the relationship between mass and volume.
We can calculate the different densities for each of the samples.
density1 = m/V = 200/180 = 1.11[mL/g]
density2 = m/V = 300/270 = 1.11[mL/g]
density3 = m/V = 400/270 = 1.11[mL/g]
According to the initial data, we can determine that the density corresponds to 1.11 [mL/g]
A mass of 2 kg is hung off a spring,which extends 2 cm determine the energy stored in the spring?
The Energy stored in the spring is 0.196 joules(0.2 joule)
Here mass = 2.0 kg
the length for which the spring extended 'x' = 2 cm
since 1m =100cm, therefore 2cm will be equal to 0.02 m so x=0.02m
Acceleration due to gravity or 'g'= 9.8 m/s^2
We have to find E = ? joules
Solving for the spring constant k
F = kx
F=mg
Therefore,
mg = kx
k = mg / x
k = 2.0 kg * 9.8 m/s^2 / 0.02 m = 980 N / m
Solving for the energy stored in the spring
E = 1/2 * k * x^2
E = 1/2 * 980 N / m * (0.02 m)^2
E = 0.196 joules
The energy stored in the spring will be 0.196 joules.
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A 0.250 kg mass is attached to a spring with k=18.9 N/m. At the equilibrium position, it moves 2.89 m/s. What is the amplitude of the oscillation? (Unit=m)
Answer: the frequency of the oscillation is given by ω=√(k/m)=√(18.9/2.5)=2.75. Keep in mind this is angular frequency, i.e. radians per second, not wavelengths per second. So the displacement can be written in the form
y = R*sin(2.75*t - δ)
Here δ is just the time offset and for our purposes is pretty irrelevant. You can in fact set it to zero since we can say we begin timing when the mass crosses equilibrium. So
y = R*sin(2.75*t)
We want to find a way to use the information "At the equilibrium position, it moves 2.89 m/s." I am going to use some calculus here since it makes things so much easier. If you haven't taken calculus yet, most likely your course has given you a formula to use instead.
We know y=0 when t=0, so y is at equilibrium when t=0. To say it moves 2.89 m/s is then to say that
y'(0) = 2.89.
From here we can differentiate the displacement function, set t=0 and solve for R. Using the chain rule:
y'(t) = 2.75*R*cos(2.75*t)
y'(0) = 2.75*R
2.75*R = 2.89
R = 1.051
Explanation: Since this is harmonic motion we can assume there is no damping force
Answer:
its .33
Explanation:
trust me
Choose each that apply
Which ones of the following are designed to interrupt the current flow of electricity when unsafe conditions arise
•gfcis(ground fault circuit interrupters
•transformers
•circuit breakers
•regulators
•fuses
Answer:
Circuit breakers
Explanation:
This is an automatic device designed for stopping the flow of current in an electric circuit as a safety measure.
Ground Fault Circuit Interrupters (GFCIs), circuit breakers, and fuses are designed to interrupt the current flow of electricity when unsafe conditions arise.
Explanation:Ground Fault Circuit Interrupters (GFCIs), circuit breakers, and fuses are all designed to interrupt the current flow of electricity when unsafe conditions arise. GFCIs are specifically designed to detect ground faults, which occur when current leaks to the ground, and they quickly shut off the power to prevent electric shocks. Circuit breakers monitor the current flowing through a circuit and trip when the current exceeds a certain threshold, protecting against overloads and short circuits. Fuses also protect against overloads and short circuits by melting and interrupting the current flow.
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Which of the following statements describe the transfer to energy?
1. Collisions of atoms causing nuclear reactions
2. A car speeding up from 5 mi/hr to 40 mi/hr
3. A transformer stepping down the voltage of electricity in power lines
4. A weightlifter lifting 100 lb. bell bar from his chest to a certain height
Answer: The answer is 1
Explanation:
because the atoms and nuclear
What is the current in a 120V circuit if the resistance 10?
Explanation:
V=IR; I=V/R
V=120V, R=10
I= 120/10=12
The current in the circuit is 12A
The current in a 120V circuit with a resistance of 10 ohms is 12 amperes, as calculated using Ohm's Law.
Explanation:To calculate the current in a 120V circuit with a resistance of 10 ohms, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). Thus,
I = V / R
I = 120V / 10Ω
I = 12A
The current in the circuit is therefore 12 amperes (A).
the particle in the atom with a negative charge is the blank
Answer:
the electron.
Explanation:
the atom has 3 types of particles: protons, neutrons, and electrons. protons have a positive charge, neutrons have a neutral charge, and they are both located in the nucleus. the electron is negatively charged, and it's located in the electron cloud, outside the nucleus.
The initial speed of a body is 7.1 m/s. What is its speed after 2.23 s if it accelerates uniformly at 2.64 m/s 2 ? Answer in units of m/s. What is its speed after 2.23 s if it accelerates uniformly at −2.64 m/s 2 ? Answer in units of m/s
The final speed of a body after 2.23 s with a positive acceleration of 2.64 m/s² is 12.988 m/s. With a negative acceleration of -2.64 m/s², the speed after 2.23 s is 1.212 m/s.
Explanation:To find out the speed of a body after 2.23 s when it accelerates uniformly, we need to use the formula for calculating final velocity (v) which is:
v = u + at, where:
For the first scenario with an acceleration of 2.64 m/s², we have:
v = 7.1 m/s + (2.64 m/s² × 2.23 s) = 7.1 m/s + 5.888 m/s = 12.988 m/s.
For the second scenario with an acceleration of -2.64 m/s² (which indicates deceleration), we have:
v = 7.1 m/s + (-2.64 m/s² × 2.23 s) = 7.1 m/s - 5.888 m/s = 1.212 m/s.
Therefore, the final speed after 2.23 s with a positive acceleration of 2.64 m/s² is 12.988 m/s, and with a negative acceleration (deceleration) of -2.64 m/s², the final speed is 1.212 m/s.
Storms are caused by. I WILL MARK BRAINLIEST
A. radiation
B. convection
C. conduction
D. hurricanes
Answer:convection
Explanation:
Convection can cause convection
Answer:
conduction is the answer
Explanation:
Find the momentum of a 25kg object traveling at a speed of 4m/s
Answer:
100Kg.m/s
Explanation:
From the question, we obtained the following information:
M= Mass = 25kg
V = Velocity = 4m/s
Momentum =?
Momentum = MV = 25x4= 100Kg.m/s
If C moves to position 5 (60 meters), what is its average velocity during these 5 seconds?
(A
10 m/s
(B
11 m/s
C)
12 m/s
D)
13 m/s
If C moves to position 5 (60 meters), the average velocity during these 5 seconds is 12m/s
Explanation:
Velocity can be defined as the rate of change of position with respect to the time.Velocity is the vector quantity as it indicates displacement direction and time.Average velocity of an object is total displacement by total time.
Velocity can be calculated by using formula v=d/t. where v=velocity, d=distance and t= time duration.
Average velocity can be calculated by, v= (Δx)×(Δt) Where Δx is the total displacement of the body and ∆t is the time.
The SI unit of velocity is m/s.
Answer:
12 m/s
Explanation:
The average velocity is simply the change in displacement over the specified time interval. In this case we have a total of five intervals, which represents 5 seconds. Dividing 60 m by 5s, gives us 12 m/s, which is the magnitude of the average speed in the interval.