Answer:(a) With our choice for the zero level for potential energy of the car-Earth system when the car is at point B ,
U
B
=0
When the car is at point A, the potential energy of the car-Earth system is given by
U
A
=mgy
where y is the vertical height above zero level. With 135ft=41.1m, this height is found as:
y=(41.1m)sin40.0
0
=26.4m
Thus,
U
A
=(1000kg)(9.80m/s
2
)(26.4m)=2.59∗10
5
J
The change in potential energy of the car-Earth system as the car moves from A to B is
U
B
−U
A
=0−2.59∗10
5
J=−2.59∗10
5
J
(b) With our choice of the zero configuration for the potential energy of the car-Earth system when the car is at point A, we have U
A
=0. The potential energy of the system when the car is at point B is given by U
B
=mgy, where y is the vertical distance of point B below point A. In part (a), we found the magnitude of this distance to be 26.5m. Because this distance is now below the zero reference level, it is a negative number.
Thus,
Which statement best describes heat and thermal energy?
O They are different words for the same thing.
O They represent different concepts.
O Heat is what happens when thermal energy stops moving between substances.
O Thermal energy is what happens when heat moves between substances.
If you push on a small car that is stuck in the mud, why do you sink into the
ground as you push on the car?
As you're applying force to the car, the mud which is a sinking surface would but you in the same place as the car is. The car is stuck in the mud and sunk to point where it cannot be pulled out unless an outside force interferes. When you apply force into the car and try to push it out, you would be put in the same situation. You would be experiencing friction which is an opposing force, in this problem, a simple machine such as a pulley would be helpful as it can lift the car from the outside. The car would act as a load and someone or some type of machine can use force to pick the car out of the mud. But if you were to try to push it out of the mud, you would just sink as the force applied would only put you in the same situation as the car, overall resulting in both beings (objects - car, human - "you" POV) being stuck in the same conumdrum.
Answer:
See below
Explanation:
Gravity will pull you down as you stand in the mud.
Additionally , if you do not push exactly horizontally ......like you push UP some , the equal and opposite force will push YOU down into the mud.
This would be like picking up a weight while you are standing there
F = ma will be greater and you will get muddier !
Do some research on digital vs. analog recording, and decide which you think gives the most accurate and best quality sound. State the advantages and disadvantages of each in a paragraph. Be sure to back up your opinions with facts, and state your sources.
Answer:
Sound quality depends on a lot of factors, and it is impossible to definitively state that either analog or digital is fundamentally better. These days, many records are made using playback of a digital file, so vinyl preference cannot be attributed solely to the differences in the way the sound wave is reproduced.
Explanation:
Milo and a friend hold opposite ends of a long toy spring. Milo compresses a few of the coils and then let’s go, while Milo’s friend keeps the other end of the spring held tight
In a case whereby Milo compresses a few of the coils and then lets go, while Milo's friend keeps the other end of the spring held tight the choices that best describes the situation with the spring's energy is that Energy moves from Milo's end to the opposite end as a wave.
What is the energy of a spring?Work is done when a spring is extended or compressed can be descvribed as the energy in the spring, however the Elastic potential energy is been seen to be stored in the spring.
It should be noted that the Provided inelastic deformation could be seen when the work done is equal to the elastic potential energy stored. Hence the Energy moves from Milo's end to the opposite end as a wave.
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missing part
Milo compresses a few of the coils and then lets go, while Milo's friend keeps the other end of the spring held tight. Which of the following choices best describes what is happening with the spring's energy? Energy moves from Milo's end to the opposite end as a wave.
Energy moves from Milo's end i the same direction.
Energy do not moves from Milo's end to the opposite end as a wave.
A force of attraction would exist between
Answer:
A south and north pole (negative and positive pole)
Explanation:
Because opposites attract
When water (H₂O) freezes into ice, some of the properties have changed. What stays the same?
O identity of the H₂O
O energy of the H₂O
O arrangement of the H₂O
O property of the H₂O
Answer:
1st one
identity of the H₂O
When water (H2O) freezes into ice, some of the properties have changed but the identity of the H2O is the same. Explanation; Water can exist in liquid, solid; ice and gaseous state; steam. Freezing occurs when water is continuously cool until it turns to solid ice, water freezes at zero degree Celsius
Hope This Helps
Answer:
A. identity of h20
Explanation:
Which imaging technique uses x-rays to make cross-sectional images of the body? mri ct scan x-ray imaging ultrasound
Computed tomography (CT) is an imaging tool that combines x-rays with computer technology to produce a more detailed, cross-sectional image of your body.
What is CT-Scane?Computed tomography (CT) scan is a useful diagnostic tool for detecting diseases and injuries.
Computed tomography (CT) is an imaging tool that combines x-rays with computer technology to produce a more detailed, cross-sectional image of your body.
It uses a series of X-rays and a computer to produce a 3D image of soft tissues and bones.
CT is a painless, noninvasive way for your healthcare provider to diagnose conditions.
A CT scan lets your doctor see the size, shape, and position of structures that are deep inside your body, such as organs, tissues, or tumors.
Hence Computed tomography (CT) is an imaging tool that combines x-rays with computer technology to produce a more detailed, cross-sectional image of your body.
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Answer:
B
Explanation:
just took the test.
How many turns should a coil wrapped around the outside of the solenoid have so that the emf induced in the coil is 15 V
The number of turns a coil wrapped around the outside of the solenoid should have is : 127 turns
Given data :
Diameter of solenoid = 25-cm
Rate of increase of magnetic field = 2.4 T/s
Induced emf = 15 v
Determine the number of turns of the coilInduced emf = N ( dФ / dt ) ---- ( 1 )
where : ( dФ / dt ) = ( A (db/dt) )
Equation ( 1 ) becomes
Induced emf = N A ( db/dt ) ------ (2)
From equation ( 2 )
N = Induced emf / A ( db/dt ) ------ ( 3 )
where : Induced emf = 15 v . db/dt = 2.4 T/s , A = area of solenoid
Area of solenoid = πr² = π * ( 0.125 )²
Insert values into equation ( 3 )
N = 15 / ( π * ( 0.125 )² ) * 2.4
= 127.32 ≈ 127 turns
Hence we can conclude that The number of turns a coil wrapped around the outside of the solenoid should have is : 127 turns.
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Below is the missing part of the question
The magnetic field inside a 25-cm-diameter solenoid is increasing at 2.4 T/s
what amount of heat is removed to lower the temperature of 80 grams of water from 75°C to 45°C? the specific heat of liquid water is 4.18J/g°C
Answer: option A.
Explanation:
Q= heat removed from the water
m= mass of the water = 80 grams
c = heat capacity of water= 4.18 J/g°C
Q = -10,032 joules -10,000 Joules
Negative sign indicates that heat was removed from the water
Answer:
10032 J must be removed
Explanation:
80 gm * (75-45 C) * 4.18 J/g-C = 10032 J
A child pushes, with a constant force, a merry-go-round with a radius of 2.5 m, from rest to an angular velocity o
f 3.0 rad/s in 8.0 s. What is the merry-go-round's tangential acceleration? What is the merry-go-rounds
centripetal acceleration? What is the merry-go-rounds angular acceleration?
The centripetal acceleration of the merry-go-round is 0.938 m/s² and the angular acceleration of the merry-go-round is 0.375 rad/s².
Angular velocity of the merry-go-roundThe angular acceleration of the merry-go-round is calculated as follows;
α = ω/t
α = 3/8
α = 0.375 rad/s²
Centripetal acceleration of the merry-go-roundThe centripetal acceleration of the merry-go-round is calculated as follows;
a = αR
a = 0.375 x 2.5
a = 0.938 m/s²
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Anders suffered a shock when his electric radio dropped into the bathtub--while anders was taking a bath. Anders argued that he did not realize it was dangerous to operate an electric radio near his bathtub. If he sues the radio manufacturer for damages, which claim is he most likely to make?.
The claim Anders is most likely to make is the failure of the manufacturer to warn about such risk.
What is a Risk?This is defined as the possibility of something bad happening and in this case it is electric shock when dropped into the bathtub.
Anders can decide to sue for not warning against risk of electric shock when in contact with water.
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*Two objects have an elastic collision. Before the collision they approach one another with a velocity of 45 m/s. With what speed will they be separating after the collision?
In the elastic collision, the velocity of approach and velocity of separation is the same. The velocity of the separation after the collision will be 45 m/s.
What is collision?The abrupt, violent coming together in direct contact of two bodies is known as the collision. a falling object and a floor are examples of collisions.
When the distance between two ships decreases while the bearings remain constant, a collision occurs.
Objects have an elastic collision. Before the collision, they approach one another V1= V2=45 m/sec
The velocity of the approach is found as;
[tex]\rm = U_1-U_2 \\\\\ = 45-45 \\\\ = 0[/tex]
As we know,
[tex]\rm e = \frac{U_2-U_1}{V_2-V_1}[/tex]
The velocity of separation is found as;
[tex]\rm V_1-V_2[/tex]
and, e=1 for elastic collision.
[tex]\rm U_1-U_2=V_2-V_1[/tex]
[tex]\rm V_2-V_1 = 0 \\\ V_2 = V_1 = 45 \ m/sec[/tex]
In the elastic collision, the velocity of approach and velocity of separation is the same.
Hence the velocity of the separation after the collision will be 45 m/s.
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what does Atomic Collisions mean
Answer:
Atomic and molecular collision processes are the physical interactions of atoms and molecules when they are brought into close contact with each other and with electrons, protons, neutrons or ions. This includes energy-conserving elastic scattering and inelastic scattering.
____________loosens up your muscles and brings your heart rate up in a slow, steady way that’s better for your body.
A.
Sprinting
B.
Cooling down
C.
Warming up
D.
Weightlifting
Answer:
C ) Warming up
Explanation:
C:
~Chiena
Answer:
B
Explanation:
hope it helps <33
By marking the tip and tail locations of a compass in the presence of a magnetic field, the magnetic _____ are traced out.
By marking the tip and tail locations of a compass in the presence of a magnetic field, the magnetic field lines are traced out.
What is a magnetic field?It is the type of field where the magnetic force is obtained. With the help of a magnetic field. The magnetic force is obtained it is the field felt around a moving electric charge.
By marking the tip and tail locations of a compass in the presence of a magnetic field, the magnetic field lines are traced out.
Hence field line is the correct answer for the blank.
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What were the different methods used for testing the paperclip and the water cohesion on the penny?
Answer:
The diffrent methods that are used for testing the paperclip and water cohesion on the penny is that first, you put the dish of water on some table, you put a paperclip in it. The second method is using a dish of soap water.
A glance at the speedometer on your vehicle will tell you your overall:_____.
a. speed. b. acceleration. c. instantaneous speed. d. average speed.
A glance at the speedometer on your vehicle will tell you your overall instantaneous speed .
The speedometer of a vehicle reveals information about the instantaneous speed of your vehicle. It shows your speed at a particular instant in time.
What is speedometer ?"A speedometer in a vehicle is an important instrument in a vehicle which shows the current speed of the vehicle and the distance of the vehicle travelled primarily. It is measuring the instantaneous values of speed and distance not the average value of the distance and the speed."
What is speed ?"The rate of change of position of an object in any direction. Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude."
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A 0.4 kg rock is dropped through a 6m height. Find its speed as it hits the ground. What is its speed at half way down?
Answer:
83.1557575 M/s
Explanation:
V²=u²+2as
v=[tex] \sqrt{u ^{2} { + 2as}^{ } } [/tex]
u is initial velocity =0
here a =g
[tex]v = \sqrt{2gs} [/tex]
v=
[tex] \sqrt{2 \times 9.8 \times 6} [/tex]
v= 83.1557575 M/s
If an airborne diver goes from a full layout position to a tuck position, what will happen to his angular momentum
If an airborne diver goes from a full layout position to a tuck position. Its angular momentum remains the same.
What is angular momentum ?The rotational analog of linear momentum is angular momentum also known as moment of momentum or rotational momentum.
It is significant in physics because it is a conserved quantity. The total angular momentum of a closed system remains constant. Both the direction and magnitude of angular momentum are conserved.
Hence, Its angular momentum remains the same.
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The Hermes is a rotating space station that allows its occupants to experience simulated gravity. If its angular velocity is 0.66 rad/s and gives a simulated gravity of 0.4g, what is its diameter?
Answer:
a = v^2 / R = ω^2 R centripetal acceleration
.4 g = .4 * 9.80 m/s^2 = 3.92 m/s^2
R = a / ω^2 = 3.92 / .66^2 = 9.0 m
D = 2 R = 2 * 9.0 = 18.0 m diameter
What is an electric field? How
do you calculate the electric
field due to a point charge?
Hello people ~
Which of the following statement is true?
(a) Electrostatic force is a conservative force.
(b) Potential at a point is the work done per unit charge in bringing a charge from any point to infinity.
(c) Electrostatic force is non-conservative
(d) Potential is the product of charge and work.
Answer:
In case of electrostatic force, the work done is independent of path, it only depends on the final and initial positions of the charge. This path independent nature makes electrostatic force a conservative force. Thus, the option a becomes true, and the opposite statement (ie.
Answer:
Option A
Explanation:
As we know that electrostatic force is path independent
It is the force present between the charges of atoms .
Hence it's conservative force.
hello people~
A conductor with a positive charge
(a) is always at +ve potential.
(b) is always at zero potential.
(c) is always at negative potential.
(d) may be at +ve, zero or -ve potential.
Answer:
B
Explanation:
Let's see the formula
V=kq/rIf q is positive it yeilds V or potential as positive hence it is at zero potential
Option B is correct
I would really appreciate the help on this pass paper question.
Answer:
Heat lost thru doors & windows = (100 - 75 - 5) = 20
20% is the fraction of heat lost thru doors and windows
One wants to obtain the largest savings per unit of cost
roof:
200 / 600 = 1/3
150 / 1000 = .15
40 / 2300 = .017
The largest of these is 1/3 so the most benefit would be obtained by insulating the roof
Since heat loss thru the roof depends on heat loss thru the attic, this is the most cost effective in reducing heat loss
The more the difference in temperature between the ceiling and roof (attic) the more heat will be lost thru the roof, so insulating the roof will decrease the heat loss of the attic
Two bars, bar 1 and bar 2, are at rest on a smooth horizontal table as shown in the top view above. Each bar is connected to the table with a vertical pin. Bar 1 and bar 2 are made from the same material and have the same physical dimensions, but bar 1 has three additional large holes drilled through it. The two bars are each accelerated from rest by forces of equal magnitude F
applied at their right end. The forces remain perpendicular to the bars and the forces are exerted for an equal amount of time t1
.
(a) Briefly explain using physics principles why the angular displacement for bar 1 is larger than the angular displacement for bar 2.
Bar 1 has larger angular displacement than bar 2 because it has more revolutions per second due to its larger hole size.
Angular speed of the bars
Angular speed is the rate of change of angular displacement with time.
ω = θ/t
where;
ω is angular speedθ is angular displacementt is time of motionThe bar with three additional large holes drilled through it (bar 1), will have more rotation per second because its holes are bigger than that of bar 2.
The bar with more rotations or angular speed will have more angular displacement.
Thus, bar 1 has larger angular displacement than bar 2 because it has more revolutions per second due to its larger hole size.
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By whom, and in what setting, was the relationship between electricity and magnetism discovered?.
Explanation:
Electromagnetism is the study of the electromagnetic force which is a type of physical interaction that occurs between electrically charged particles.
Hans Christian Oersted discovered the relationship between electricity and magnetism in 1820.
6. Jones covered a distance of 50 miles on his first trip. On a later trip he traveled 300 miles while going three times as fast. His new time compared with the old time was: (a) three times as much, (b) twice as much, (c) the same, (d) half as much, (e) a third as much
first trip= 50 miles.
second trip= 300 miles.
to find:his new time compared to the old time.
solution:Let speed of the 1st trip x miles / hr. and speed of the 2nd trip 3x / hr.
Speed = Distance/Time
So, times taken to covered a distance of 50 miles on his first trip = 50/x hr.
= 100/x hr
Therefore, his new time compared with the old time was twice as much.
answer= b) twice as much
Acceleration depends on which two factors?
A) mass and position
B) net force and mass
C) mass and velocity
D) position and net force
Taking into account the Newton's second law, acceleration depends on position and net force (option D).
Newton's second lawAcceleration in a body occurs when a force acts on a body. There are two factors that influence the acceleration of an object: the net force acting on it and the mass of the body.
Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.
So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N]m = Mass [kg]a = Acceleration [m/s²]SummaryIn summary, the acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. (option D)
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Balance the nuclear equation by giving the mass number, atomic number, and element symbol for the missing species.
The complete equation for the nuclear reaction is 10/5 B + 4/2He ------> 13/7N + 1/on
What is a nuclear reaction?A nuclear reaction is one in which the nucleus of one isotope is changed into the nucleus of another isotope. In this process some particles may be released.
Looking at the reaction equation, we know that the complete equation for the nuclear reaction is 10/5 B + 4/2He ------> 13/7N + 1/on
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What is meant by the "objectivity" of web documents, and what are the three things to look for when evaluating a website for objectivity? (site 1)
Objectivity refers to the ability of a writer to present ideas or situations factually as they are without partiality.
What is objectivity in writing?Objectivity refers to the ability of a writer to present ideas or situations factually as they are and not based on his or her own preconceived notions or bias.
To check for objectivity in a web document, one has to ;
check the source of the material compare different web documents with itcheck on the websites credibility rating from othersTherefore, objectivity means being truthful and impartial.
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