Answer:
the pe at the top of the building: 784 J
the pe halfway through the fall: 392 J
the pe just before hitting the ground: 784 J
Explanation:
Pls brainliest me
I had this question before
A boat moves 60 kilometers east from point A to point B. There, it reverses direction and travels another 45 kilometers toward point A. What are
the total distance and total displacement of the boat?
OA. The total distance is 105 kilometers and the total displacement is 45 kilometers east.
OB. The total distance is 60 kilometers and the total displacement is 60 kilometers east.
OC. The total distance is 105 kilometers and the total displacement is 15 kilometers east.
OD. The total distance is 60 kilometers and the total displacement is 45 kilometers east.
Answer:1) the total distance is the sum of the two distances
60 km + 45 km = 105 km
2) The displacement is the net movement, or the difference between the initial position and the final position
Call x the initial position, then the final position is x + [60km - 45km]
And the displacement is x + (60km - 45km) - x =60km -45 km = 15 km
Explanation:
How much momentum will a dumbbell of mass 10kg transfer to the floor if it falls from a height of 80cm (assume that the dumbbell stops after hitting the ground) ? Take g=10m/s^2
(Point stealers will be reported so better dont do it)
Answer: momentum = 40kgm/s
Explanation:
Given that the
Mass M = 10kg
Height H = 80 cm = 0.8m
g = 10m/s^2
The velocity of the dumbbell as it fall can be calculated by using the formula;
V^2 = U^2 + 2gH
Since the dumbbell fell from rest, initial velocity U = 0
Substitute g and H to get final velocity V
V^2 = 0 + 2 × 10 × 0.8
V^2 = 16
V = sqrt(16)
V = 4 m/s
Momentum is the product of mass and velocity. That is,
Momentum = MV
Substitute mass M and V into the formula
Momentum = 10 × 4 = 40kgm/s
Therefore, 40 kgm/s momentum will be transferred as the dumbbell fall to the floor.
During which type of collision is none of the energy converted to sound
energy?
O A. Inelastic
O B. Perfectly inelastic
O C. All collisions
O D. Elastic
Answer: Elastic
Explanation: Just took the quiz
You have an old style reel lawn mower at home. No engine! You need to cut the grass but also finish in time to watch your favorite Tv show. How would you apply Newton’s second law of motion here?
Answer:
the force on an object is equal to its mass times its acceleration.
Explanation:
the more heavier the object (lawn mower) the more time it will take to cut the grass due to that the tv show will be gone
The mass of the old-style reel lawn mower will be large, it will take to too much time to cut the grass as the acceleration of the lawn mower will be less.
What is Newton's second law of motion?According to Newton’s second law of motion, the force equals mass times acceleration for a constant mass.
This states that the acceleration of an object depends on two variables. The first one is the mass of the object and the net force acting on the object. The acceleration is directly proportional to the net force acting on the body and inversely proportional to the mass.
The expression of Newton’s second law can be written as follows:
F = ma or a = F/m
The expression shows that the direction of the acceleration vector is the same direction as the net force vector.
The acceleration of the mower will be inversely proportional to the mass of the lawn mower. The larger the mass of the mower, the smaller the acceleration produced by a given force in the mower.
Therefore, an old-style reel lawn mower will take more time to cut the grass.
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May I please get some help?
A unicorn running on a beach at 8 m/s changes speed at a constant rate of 2.7
m/s2 over a period of 2 seconds. What is the unicorn's velocity at the end of this
time?
Answer:
13.4 m/s
Explanation:
Write down what you have, so:
V0=8 m/s
a=2.7 m/s^2
t=2 seconds
We are trying to find final velocity, so we will use vf = v0 + at
From there, we plug in the given values.
vf = 8 m/s + (2.7 m/s^2 x 2 seconds)
vf = 13.4 m/s
Answer:
about 13s
Explanation:
You pull a force of 255 N on a piece of luggage of mass 68 kg but does not move the coefficient of friction between the luggage in the floor is .7 what is the force of static friction acting on the luggage
Answer: 255N
Explanation:
Given the following :
Applied force (F) = 255N
Mass (M) of the body = 68kg
Coefficient of static friction (Us) = 0.7
Recall:
Us = frictional force / normal reaction(N)
Normal reaction( N) = mass × acceleration due to gravity
N = mg = 68 × 9.8m/s^2 = 666.4N
Therefore,
Frictional force = coefficient of static friction × normal reaction
Frictional force = 0.7 × 666.4 = 466.5N.
In other for the body to move, the minimum applied force must be greater than the frictional force in other to overcome the force of friction.
Here, the force applied on the object is equal to the force of static friction which is less than the frictional force.
255N = force of static friction.
Answer: 255N
Explanation: a p e x
PLS HELP!
Raymond Cattell created the 16PF self-inventory assessment by first taking 4,504 personality traits and removing all of the __________.
A. nouns
B.homonyms
C.synonyms
D.antonyms
Raymond Cattell created the 16PF self-inventory assessment by taking 4,504 personality traits and removing all of the synonyms.
What is Synonym?This is defined as a word or phrase which has a close or near meaning to the other.
Raymond Cattell created the 16PF self-inventory assessment by removing the synonyms from the personality traits.
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Unlike mechanical waves, electromagnetic waves can travel through a .....such as you would in space
Answer: vacuum without a material medium for its propagation
Explanation:
Unlike mechanical waves, electromagnetic waves can travel through a vacuum without a material medium for its propagation such as you would in space
Mechanical waves need a medium for its propagation when travelling through a vacuum while electromagnetic wave does not need a material medium for its propagation when travelling through a vacuum.
In a weak acid solution, _____.
A.) all ions in the acid compound form water
B.) many ions in the acid compound form a base
C.) no ions separate from the acid compound
D.) few ions separate from the acid compound
Answer:
A)
Explanation:
How did the angel of the pendulum affect the period
Answer:The starting angle of a pendulum does not affect its period for .
Explanation: however, the period increases with increasing . The starting angle of a pendulum does not affect its period for.
A projectile is fired vertically upwards and reaches a height of 78.4 m. Find the velocity of projection and the time it takes to reach its highest point.
Answer:
1.) U = 39.2 m/s
2.) t = 4 seconds
Explanation: Given that the
height H = 78.4m
The projectile is fired vertically upwards under the acceleration due to gravity g = 9.8 m/s^2
Let's assume that the maximum height = 78.4m. And at maximum height, final velocity V = 0
Velocity of projections can be achieved by using the formula
V^2 = U^2 - 2gH
g will be negative as the object is moving against the gravity
0 = U^2 - 2 × 9.8 × 78.4
U^2 = 1536.64
U = sqrt( 1536.64 )
U = 39.2 m/s
The time it takes to reach its highest point can be calculated by using the formula;
V = U - gt
Where V = 0
Substitute U and t into the formula
0 = 39.2 - 9.8 × t
9.8t = 39.2
t = 39.2/9.8
t = 4 seconds.
The shape of a lens affects the _____. A. direction light is bent B. color of light moving through it C. medium in which the light travels D. speed of light traveling through it
Answer:
A.The direction in which light is bent
Explanation:
That why I the topic thin lenses we learn how to draw Ray's of light
Answer:
a
Explanation:
Reduce contrast
Show Help
Key Stage 3 Science - Physics
24 ✓ 67%
Question 37 of 45
A wave has a wavelength of 10 m and a speed of 65 m/s. What is the frequency of this wave in Hz?
Hz
Enter your answer as a number
CA
9
O
Answer: frequency = 6.5 Hz
Explanation:
Given that the
Speed V = 65 m/s
Wavelength (λ) = 10m
Wave speed is the product of frequency and wavelength. That is,
V = fλ
Substitute V and (λ) into the formula to get frequency f
65 = 10f
Make f the subject of formula
f = 65/10
f = 6.5 Hz
Therefore, the frequency of this wave is 6.5 Hz?
frictional force acting on a 0.5 kg object and a floor is 3 N. What is the coefficient of friction between the object and the floor?
Answer:
μ = 0.6
Explanation:
F = μN
N = mg
F = μmg
3 N = μ*0.5 kg * 9.8 m/s²
μ = 3/(0.5*9.8) = 0.6
Write down four reasons why plastic is put around electrical wires?
Plz help me
Answer:
1) is to prevent accidental contact with other conductors of electricity
2) to prevent getting shocked
3) Plastic helps dissipate the heat as well as prevent the wire from getting too hot and causing fire.
4) Without plastic, hot and neutral wires cannot be run in the same conductor or same wire
Explanation:
hope this helped and plz mark me as brainliest
ANSWER:
Reasons of using plastic around electrical wires are:
•To protect people from electric shock.
•To prevent the accidental contact of metallic partof wire with other conductor of electricity.
•To prevent the wire from getting too hot and causing fire.
•To conduct the electric flow of current properly .
When light passes from a slower medium into a faster medium, which of the following explains what will occur?
A. Light will not be refracted.
B. Light will be refracted toward a line drawn perpendicular to the point of refraction.
C. Light will be refracted away from a line drawn perpendicular to the point of refraction.
Answer:
B. Light will be refracted toward a line drawn perpendicular to the point of refraction.
Which processes occur during the second stage of technological design? Check all that apply
designing a solution
studying relevant information
rebuilding and retesting
reporting a solution
defining criteria of success
identifying a problem
building a prototype
Answer:
building a prototype
Explanation:
an early model from which later versions are developed
Answer:
Design, evaluate, identify, implement.
Explanation:
What is the net displacement of the particle between 0 seconds and 80 seconds?
Velocity (m/s)
chhi NSON WAO
20
40
80
280
100
Кузорил
Time (s)
OA.
160 meters
OB.
80 meters
OC.
40 meters
OD.
20 meters
OE.
0 meters
Answer: 80
Explanation:
The question is incomplete, There is no specific time for the specific velocity, which is not provided in this question instead of giving the total time interval from 0sec to 80 sec. According to my assumption, I think the net displacement will be 20 m. The correct answer will be option D.
What is net displacement?Net displacement is the total change in the position of an object, taking into account both the magnitude and direction of its motion. It is a vector quantity and is expressed in terms of distance and direction.
In other words, it is the final position of an object relative to its initial position, irrespective of the path taken. It is calculated by finding the vector difference between the final and initial positions of the object.
For example, if an object moves 10 meters to the east and then 5 meters to the north of its starting position, then its net displacement would be the vector sum of these two displacements, which is the diagonal distance between its starting and final positions.
Here in the Question,
To calculate the net displacement of the particle between 0 seconds and 80 seconds based on the given options, we can use the fact that the net displacement is the same as the final position minus the initial position.
Let's assume that the initial position is zero.
Option A. If the net displacement is 160 meters, the final position would be 160 meters. However, looking at the velocities given, we can see that the particle goes back and forth, so it does not make sense for the net displacement to be larger than the maximum displacement in one direction.
Option B. If the net displacement is 80 meters, the final position would be 80 meters. This option could be possible if the particle moves in one direction for a while and then moves back to its initial position. This is incorrect.
Option C. If the net displacement is 40 meters, the final position would be 40 meters. This option is also possible if the particle moves in one direction for a shorter period of time. This is not relevant to the question.
Option D. If the net displacement is 20 meters, the final position would be 20 meters. This option could be possible if the particle moves in one direction for a very short period of time. This is most relevant to the Question.
Option E. If the net displacement is 0 meters, the final position would be the same as the initial position, which is zero. This option could be possible if the particle moves back and forth such that the positive displacements cancel out the negative displacements.
Therefore, based on the given options, the correct answer for the net displacement of the particle between 0 seconds and 80 seconds is option D: 20 meters.
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which of the following are good conductors under normal conditions? A. Penny B.copper wire C. a dime D.plastic E.aluminum foil F.water
Answer:
see explanation
Explanation:
A,B,C,E
B.
Because its copper
32. For each of the listed parts of a power plant, make a selection to indicate in what
type(s) of power station the part is found. Place your answer in in the blank space!
I. part of a coal-fired power plant
II. part of a nuclear power plant
III. part of a coal-fired power plant and part of a nuclear power plant
a. boiler. ( insert answer)
b. combustion chamber(
c. condenser(
d. control rod(
generator(
f. turbine(
From a to f choice which of the following from I, II, III is appropriate from a to F
Answer: a. boiler - I. part of a coal-fired power plant.
b. combustion chamber - I. part of a coal-fired power plant.
c. condenser - III. part of a coal-fired power plant and part of a nuclear power plant.
d. control rod - I. part of a coal-fired power plant.
e. generator- III. part of a coal-fired power plant and part of a nuclear power plant.
f. turbine - III. part of a coal-fired power plant and part of a nuclear power plant.
Explanation:
a. Boiler: It is used in the coal power plant to heat the water used for producing electricity. The boiler keeps the temperature of water or steam at a desired level.
b. Combustion chamber: It is used for combustion of coal and using thermal energy for electricity generation.
c. Condenser; It is used in both nuclear and coal power plants. It condense and receive from the turbine.
d. Control rod: It is used in the nuclear power plant for controlling the nuclear fission and fusion reactions of heavy metals.
e. Generator: It converts the thermal energy into electrical energy.
f. Turbine: The turbine blades move with the effect of steam or any form of energy and the energy so produce is used for generating electricity in generator.
Which of these correctly describes the work done on a book when a person lifts it vertically, at a constant speed?
A. Negative work was done on the book because the book was displaced in the direction opposite to which the force was applied.
B. Work was done on the book because the book displaced in the direction a force was applied.
C. Work was not done on the book because it moved at constant velocity and so there was no net force acting on the book.
D. Work was not done on the book because it exerted as much force on the person lifting the book as the person exerted on it.
Answer:
B. Work was done on the book because the book displaced in the direction a force was applied.
The part that correctly describes the work done on a book when a person lifts it vertically, at a constant speed is :
B. Work was done on the book because the book displaced in the direction a force was applied.
"Lifting a Book"The part that correctly describes the work done on a book when a person lifts it vertically, at a constant speed is that the Work was done on the book because the book displaced in the direction a force was applied.
Work is done as it were when an object that's being pushed or pulled really moves.
In the event that you lift a book, you apply a constrain and do work.
Thus, the correct answer is B.
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What is the weight, on Earth, of a book with a mass of 1.5 kg?
0 15 N
6.5 N
11.3.N
147 N
[tex]solution \\ mass = 1.5 \: kg \\weight = m \times \: g \\ \: \: \: \: \: \: \: \: \: \: \: \: = 1.5 \times 9.8 \\ \: \: \: \: \: \: \: \: \: = 14.7 \: newton[/tex]
hope this helps...
Good luck on your assignment...
Given:
Mass,m = 1.5 kgAcceleration due to gravity,g = 9.8 m/s² [ constant ]To find out:
Find the weight?
Formula used:
Weight = m × g
Solution:
Weight of book = m × g
★ Putting the values in the above formula,we get:
Weight of book = 1.5 × 9.8
= 15/10 × 98/10
= 1,470/100
= 14.7 kg.m/s²
A hydrogen line in a star's spectrum
has a frequency of 6.17x10^14 Hz
when stationary. In Rigel's spectrum,
it is shifted downward by 4.26x10^10
Hz. What is Rigel's velocity relative
to us?
PLS HELP!
Answer: V = 4.35 × 10^12 m/s
Explanation: To calculate Rigel velocity relative to us, we should use doppler effect formula.
Fo = (c ) / ( c - Vs) × f
Fo/f = (c ) / ( c - Vs)
4.26 × 10^10 = (3×10^8) 6.17×10^14/(3×10^8 - V)
4.26×10^10/6.17×10^14 = (3×10^8)/(3×10^8 - V)
6.9×10^-5 = (3×10^8)/(3×10^8 - V)
Cross multiply
20713.13 - 6.9×10^-5V = 3×10^8
Collect the like terms
6.9×10^-5V = 3×10^8 - 20713.13
6.9×10^-5V = 299979286.9
V = 299979286.9/6.9×10^-5
V = 4.3475 × 10^12 m/s
Therefore, Rigel's velocity relative to us is 4.3475 × 10^12 m/s
how much energy must be transferred to a normal incandescent bulb (efficiency 0.05) for it to transfer 9J of energy by light?
Answer:
Revise energy transfers and use sankey diagrams to calculate the efficiency of these conversions with BBC ... Efficiency is a measure of how much useful energy is converted. Part of ... This is the Sankey diagram for a typical filament lamp: 100 joules of electrical energy is converted to 10 joules of light energy and 90 joules.
Explanation:
A disease common among hat makers in the seventeenth century was caused by their direct contact with
A 14 kilogram beam is hinged at one end. A 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object are placed as shown in the figure. The dots indicate the individual centers of gravity of the beam and objects. The center of mass of the entire system must be:
Answer: 1.3 m
Explanation:
From the figure attached, 3 materials are involved. A 14 kilogram beam hinged at one end, a 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object.
Let take the moment at the hinge axis.
The moment for the beam will be
14 × ( 0.36 + 0.53 ) = 12.6
The moment of the triangle object will be 6 × 0.36 = 2.16
The moment of capital I shape will be
7.5 × ( 0.36 + 0.53 + 1.92 ) = 21.075
The total moment = 12.6 + 2.16 + 21.075
The total moment = 35.835
The total mass = 14 + 6 + 7.5 = 27.5
The center of mass of the entire system must be:
X = total moment ÷ total mass
Substitute both in the formula
X = 35.835/27.5
X = 1.3 m.
Therefore, The center of mass of the entire system must be 1.3m
During the Patient Care Era, a more demanding and educated public now expected the pharmacist to be a therapeutic advisor and _______________.
During the Patient Care Era, a more demanding and educated public now expected the pharmacist to be a therapeutic advisor and patient advocate.
Who is a pharmacist?A pharmacist, often known as a chemist or druggist, is a healthcare practitioner who prepares, regulates, formulates, preserves, distributes, and counsels the public on how to take medications safely and effectively for the greatest possible benefit with the fewest possible negative effects.
Based on a patient's medical history, consultant pharmacists analyse their prescription regimens in order to assess the appropriateness, safety, advantages, disadvantages, and cost-effectiveness of their pharmaceutical treatment.
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the planet express is in a circular orbit around the earth and has a total mechanical energy of -4.6 x 10^10 j. how much work must be provided by the planet expresss rockets in order to completley escape earth
Answer: total mechanical energy of -4.6 x 10^10 j.
Explanation: the planet express is in a circular orbit around the earth and has a total mechanical energy of -4.6 x 10^10 j.
The total mechanical energy is the sum of potential energy and the kinetic energy.
For the rocket to experience the escape from earth, the total work done will be equal to maximum kinetic energy.
According to conservative of energy, maximum kinetic energy is equal to the total mechanical energy.
The work must be provided by the planet expresss rockets in order to completley escape earth will be equal to total mechanical energy of -4.6 x 10^10 j.
The energy a wave carries is measured by its ____. Question 15 options: wavelength frequency amplitude speed
Answer: frequency is the answer to this question
Answer:
frequency
Explanation:
c a n v a s / a p e x :))
The woman was standing on a cliff 30 meters above where she landed. There was a safety fence 4 meters from the cliff edge that would have prevented her from taking a long distance to run and leap off the cliff. She landed 12 meters away from the base of the cliff. Her launch speed was calculated to be 4.86 m/s, meaning that to travel those 12 meters, she had to be traveling at 10.87 miles per hour (or moving faster than a runner at a 5.5 minute mile pace) as she left the cliff. Put all this information together. Why did forensic scientists determine that the woman’s body was thrown instead of concluding that she jumped off the cliff?
Answer:
Forensic scientists determined that the woman’s body was thrown off the cliff because after considering the velocity and angle of the projectile needed in relationship to the cliff she could not have reached those speeds and cleared the safety fence 4m away from the cliff’s edge. She would have been going faster than a 5.5 minute mile pace and she was not an athletic person.
** Just make sure to change the format and/or wording. Hope I was helpful :-)
The woman’s body was thrown instead of concluding that she jumped off the cliff as there has more initial speed than regular which is provided during throw.
What is projectile motion?When a particle is hurled obliquely near the surface of the earth, it travels along a curved path while accelerating continuously in the direction of the planet's center (we assume the particle stays close to the surface of the globe). Such a particle's motion is known as projectile motion, and its route is referred to as a projectile.
Given: She landed 12 meters from the cliff's base.
And when she jumped off the cliff, her estimated launch speed was 10.87 miles per hour. She could have avoided having to go a considerable distance in order to jump over the cliff by using the safety barrier that was 4 meters away.
Hence, Instead of drawing the conclusion that the woman leaped from the cliff, the body of the woman was flung since throwing provides more initial speed than usual.
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