Answer:
80 J
Explanation:
PE = mgh
PE = (4 kg)(9.8 m/s^2)(2 m)
PE = 78.4 J and with sig figs, it would be 80 J
science not has only achievements but also challenges justify with an example
In Ancient Greece, athletes competing in the long jump used handheld weights called halteres to lengthen their jumps. You are a 78 kg history major on the track and field team and decide to try this strategy. You jump at 10.3 m/s, 22.8 degrees above the horizontal. At the peak of your jump you throw two 5.5 kg masses horizontally behind you such that their velocity is zero in the ground's reference frame. What distance do the halteres add to the jump in m
The halter add the distance to the jump in meters is 0.55 m.
What is projectile?When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion. The object which follows the projectile motion is called the projectile.
The magnitude of velocity u =10.3 m/s, angle of jumping θ = 22.8 degrees.
Components of velocity in x and y direction are
Vx = 10.3 cos 22.8 = 9.5 m/s
Vy = 10.3 sin 22.8 = 4 m/s
Maximum Range of athlete achieved using halter is given by
R = u²sin2θ /g
where, u = initial velocity, θ is the angle of projection and g is the gravitational acceleration.
Substituting the values, we get
R = (10.3)² sin(2 x 22.8 °) / 2 x 9.81
R = 7.75m
At the peak of jump you throw two 5.5 kg masses horizontally behind you such that their velocity is zero in the ground's reference frame.
The momentum is conserved in this situation,
(M+2m)Vxo =MVx'
Vx' = (M+2m)/M x Vxo'
Change in x component of velocity ΔVx = Vx' -Vxo
Vxo = 2m/M x Vx
Vxo = 2 x 5.5 /78 x 9.5
Vxo = 1.34 s
Maximum height gained when final velocity is zero
Vy = 0 = Vyo -gt
time t = Vyo/g = 4/9.8 = 0.41s'
Increase in range by using of halters is
ΔR = ΔVx' x t
ΔR = 1.34 x 0.41
ΔR =0.55m
Thus, the halter add the distance to the jump in meters is 0.55 m.
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Suppose a=3i-2j+k b=-i-4j+3k and c is avector lying along positive x axis with the property that a(b+c)=0 then find c?
The value of the c will be (0 i+0 j+0 k). c is a vector that is along the positive x-axis and has the condition a(b+c)=0.
What is a vector?A vector is a quantity or phenomena with magnitude and direction that are independent of one another. The phrase also refers to a quantity's mathematical or geometrical representation.
Given ;
a=3i-2j+k
b=-i-4j+3k
Given property:
a(b+c)=0
-i-4j+3k ((-i-4j+3k)+c)=0
(3+8+3)(-i-4j+3k)c=0
14(-i-4j+3k)c=0
c=0 i+0 j+0 k
Hence, the value of the c will be (0 i+0 j+0 k).
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Which of the following statements is true about transverse waves?
A: They always have the same frequency.
B: They always have the same velocity.
C: They always have the same wavelengths
D:The particles vibrate in a parrallel direction with respect to the wave motion.
E: The particles vibrate in a perpendicular direction with respect to the wave motion
Answer:
The answer is option E
Explanation:
The particles vibrate in a perpendicular direction with respect to the wave motion
Which describes the type of acceleration in the graph?
Answer:
Constant positive acceleration
Explanation:
Which statement best defines the relationship between work and energy?
Work can transfer energy between objects and increase radiant energy.
Work can transfer energy between objects and cause a change in the form of energy.
Work can transfer energy between objects and decrease nuclear energy.
Work can transfer energy between objects and cause a change in the amount of total energy.
The relationship between work and energy is that work can transfer energy between objects and cause a change in the form of energy.
What is energy?Energy is simply defined as the ability to do work.
Energy possessed by any object or matter enables it to do work of various forms.
Energy can be transferred from one object to another. Also, energy can be transformed into various forms.
Therefore, the relationship between work and energy is that work can transfer energy between objects and cause a change in the form of energy.
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Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple. which of these tools should she use for this purpose? an electronic balance a stopwatch a barometer a graduated cylinder
Sian wants to count the number of seconds it takes for a beaker's contents to become purple from clear. She should utilize a stopwatch as her instrument for this job.
What is a stopwatch?Watch that, when turned on and off, measures the amount of time that has passed since a specific time.
Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple. Stopwatch is the tool she should utilize for this purpose.
Hence, option B is correct.
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Answer: Sian wants to count the number of seconds it takes for a beaker's contents to become purple from clear. She should utilize a stopwatch as her instrument for this job.
option b
Explanation:
An object is placed 14.0 cm from a diverging lens. If a virtual image appears 10.0 cm from the lens on the
same side as the object, what is the focal length of the lens?
Use lens formula
1/f=1/v-1/u1/f=1/-10-1/141/f=-7-5/701/f=-12/70f=70/-12f=-5.8cmThe focal length of the lens is 5.8 cm.
To find the focal length, the given values are:
Image distance - 10 cm
Object distance - 14 cm
What is focal length and how it was calculated?The distance between the convex lens or a concave mirror and the focal point of a lens or mirror is called the focal length. This is the parallel line which meet at the distance from the lens or mirror.
1/Focal length = 1/Image distance + 1/Object distance ( cm )
1/f = 1/v-1/u
1/f = 1/-10-1/14
1/f = -7-5/70
1/f = -12/70
f = 70/-12
f = -5.8cm
The focal length of the lens is - 5.8 cm.
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What's manifestation
Answer:
Explanation:
the action or fact of showing an abstract idea.
(◑.◑)!
Manifestation (or manifesting) refers to
various pseudoscientific self-help
strategies intended to burning about
a personal goal, primary by focusing
one's thought upon the desired outcome.
The techniques are based on the law
of attraction of New Thought spiritually.
While the process involves positive
thinking, or even directing request to
"the universe", it also involves
action-steps on the part of the individual.
Manifestation has been criticised as
having no basis in physical science.
Alison Bernstein, a professor of
translational neuroscience at Michigan
State University said in an interview
with Vice that "You can't magically
make things happen. You can [However]
change the way you react to certain
situations, which sounds to me like
Cognitive Behavioral Therapy". She
want no to assert that "manifestation
is not supported by science.
What can be described as a technology that uses high-frequency sound waves to create images
Answer:
Ultrasound imaging.
Explanation:
It uses high-frequency sound waves to view inside the body.
A swimmer swims 20 m in 40 s. The swimmer's average speed is
------------- m/s.
Explanation:
Average speed=distance/time
=20/40
=0.5m/s
What is the atomicWhat is the atomic mass of neon? Give your answer to the nearest tenth. number of neon?
Answer:
atomic mass = 20.2 amu
atomic number = 10
Explanation:
The atomic mass is the average mass of an atom of a particular element. For neon, the atomic mass is about 20.180 amu. Rounded to the nearest tenth, the atomic mass is 20.2 amu.
The atomic number is the number of protons in the nucleus of a particular element. For neon, the atomic number is 10.
Both of these values can usually be found on the periodic table under neon (Ne).
A stunt pilot in an air show performs a loop-the-loop in a vertical circle of radius 3.80 103 m. During this performance the pilot whose weight is 623 N, maintains a constant speed of 2.10 102 m/s. (a) When the pilot is at the highest point of the loop determine his apparent weight in N. N (b) At what speed, in m/s, will the pilot experience weightlessness
The apparent weight of the pilot would be 619.48 N and the speed he would experience at weightlessness is 192. 97 m/s
What is apparent weight?
Apparent weight is a property of object that co-relates to the heaviness of the object.
It differs from the weight of an object as a result of the in-balance between the force acting on the object and an equal but opposite force
How to calculate the apparent weight
Formula:
Apparent weight = Real weight (mg) - m v∧2 ÷ r
Where m = mass
g = acceleration due to gravity = 9.8 m/s²
v = constant velocity = 2. 10 × 10∧2 m/s
r = radius = 3.80 × 10∧3 m
Note that weight = mg
m = weight ÷ g = 623 ÷ 9.8 = 63. 57 kg
a. Apparent wieight = 623 - (63. 57 × 2.10 × 10∧2 × 2.10 × 10∧2) ÷ 3.80 × 10∧3)
= 623 - (63.57 × 210) ÷ 3800
= 623 - 13377 ÷ 3800
= 623 - 3. 52
= 619.48 N
b. At weightless, weight = 0
Speed, V = √g× r = √ 9.8 × 3800 = √37,240 = 192. 97 m/s
Hence, The apparent weight of the pilot would be 619.48 N and the speed he would experience at weightlessness is 192. 97 m/s
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please help me with this
Answer: you got it duDee
Explanation:
Action and reaction forces are described by which of Newton’s laws of motion?
first
second
third
fourth
Answer:
third
Explanation:
for every action there is an equal and opposite reaction
example
bouncing ball
ball receives a force from the ground due to collision
that same force causes the ball to bounce off the ground
first law:
inertia
example
stuff in space doesn't move unless its pushed
then it keeps going unless something stops it
second law
force = mass times acceleration
example
harder you push a cart the faster it goes
the less a cart weighs the faster a cart goes
studysmarterus
spacecenterorg
energywavetheory
Lab: newton's laws of motion assignment: lab report
Newton's motion laws state that if an object is at rest or in movement, it will tend to maintain its basal state.
What are Newton's motion laws?Newton's motion laws are a set of scientific statements aimed at explaining the physical property of movement.
These laws explain why objects in movement tend to maintain the same velocity for a short period of time.
In conclusion, Newton's motion laws state that if an object is at rest or in movement, it will tend to maintain its basal state.
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According to the graph of displacement vs. time, what is the object's velocity at a displacement of 0.2 meters?
According to the graph of displacement vs. time, the object's velocity is 0.02 m/s
What is displacement?The displacement is the shortest distance travelled by the particle. It is the vector quantity which re[presents both the magnitude and direction.
Velocity is the time rate of change of displacement with time.
Given is the displacement 0.2 m and time taken is 10s. So, the velocity is
v = 0.2/10
v = 0.02 m/s
Thus, the object's velocity is 0.02 m/s
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4) An electron in a mercury atom changes from
energy level b to level e. This energy-level
change occurs as the atom.
(1) absorbs a 2.03-eV photon
(2) absorbs a 5.74-eV photon
(3) emits a 2.03-eV photon
(4) emits a 5.74-eV photon
The energy-level change occurs as the atom is absorbs a 2.03-eV photon.
Energy change of the mercury atom
The energy change of the mercury atom is calculated as follows;
Energy emitted by a photon when it falls from level b to energy level e is calculated as follows;
ΔE = -3.71 eV - (-5.74 eV)
ΔE = -3.71 eV + 5.74 eV
ΔE = 2.03 eV
When electron jumps from lower energy level to higher energy level, energy is absorbed, thus, the energy-level change occurs as the atom is absorbs a 2.03-eV photon.
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it is a routine composed of yells and cheers gymnastic skill and dance
Cheer dance is a routine composed of yells and cheers gymnastic skill and dance.
What is cheer dance?Cheer dance or cheerleading is a group activity used to entertain fans at athletic events and inspire louder, more enthusiastic cheering. It combines dancing and acrobatic aspects with shouted phrases.
A never-ending range of diverse stunts, jumps, pyramids, dances, and chants that integrate a variety of different movements can be included in the immensely complex sport of cheerleading. Base, partner, and spotter are the three primary cheerleading roles. These roles are all a part of cheerleading stunts, which pose the greatest risk of harm to participants.
It is a competitive sport and leisure activity made up of a set routine with necessary performance components, much like in gymnastics and dance. Additionally, it hopes to get the crowds to cheer in team sports event.
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Your question is incomplete, but most probably your full question was:
1. It is a routine composed of yells and cheers, gymnastic skills and dance.
A. Contemporary dance
B. Hip-hop dance
C. Street dance
D. Cheer dance
a balloon was inflated to a temperature of 32 degrees celsius. as it floated into the sky it reached a temperature of 0 degrees celsius. what is the new volume
Answer:
P V = N R T so
V2 / V1 = T2 / T1 assuming other variables stay constant
V2 = (273 / 305) * V1
V2 = .90 V1
BRAINLIEST + 19 pts what does a capacitor do in a circuit?
A. it reduces current.
B. It increases voltage
C. It stores and releases charge.
D. it overcomes resistance
answer: c
explanation: it's job is to store and release charge
Answer:
C- It stores and releases charge
Open the attached file. It shows 2 waves (a blue one and an orange one) that are moving through the same medium at the same time. Your challenge is to DRAW the RESULTANT wave and LABEL the areas of interference with CI, DI and/or points of TDI.
The diagram is labelled to DRAW the RESULTANT wave and LABEL the areas of interference with CI, DI and/or points of TDI.
What is refraction?When a light ray falls on the interface of two medium like air and water, then the portion of light is reflected and another portion of the light is refracted into the water medium. The angle of incidence is equal to the angle of reflection but the angle of incidence is larger then the angle of refraction.
Open the attached file. It shows 2 waves (a blue one and an orange one) that are moving through the same medium at the same time.
Thus, the diagram is labelled.
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Which type of volcanic mountain has wide, gentle slopes?
1) rift
2) shield
3)composite
4) cinder cone
Describe how you come in direct contact with at least 5 of the 7 areas of the electromagnetic spectrum each day.
One come in direct contact with micro, radio, radar, infrared and visible waves.
What is electromagnetic spectrum?The electromagnetic spectrum consists of the range of all types of EM radiation. Radiation is packet of energy that travels and spreads out. It has radio waves, infrared waves and visible light waves, ultraviolet rays and microwaves.
They possess high energy even to penetrate deep within the material. electromagnetic spectrum has longer wavelength and less frequency.
Everyday life is completed by artificially made electromagnetic radiation:
Daily food is heated in microwave ovens using micro waves.The airplanes are guided by radar waves,The televisions receive radio waves transmitted by broadcasting stations, and infrared waves used by heaters provide heat.Thus, we come in direct contact of the waves in electromagnetic spectrum.
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Which is an example of a way that
machines make work easier?
A. They spread a small force over a small
distance.
B. They spread a small force over a larger
distance.
C. They make the force exert all at once.
D. They increase the time it takes to do a task.
Answer:
C Thy make the force exert all at once
The electromagnetic waves with the longest wavelength are: *
-microwaves
-gamma rays
-radio waves
-visible light
Answer:
Radio waves
Explanation:
I hope it helps u dear^_^
[tex] \huge \tt \color{pink}{A}\color{blue}{n}\color{red}{s}\color{green}{w}\color{grey}{e}\color{purple}{r }[/tex]
electromagnetic waves :- electromagnetic radiation▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂
[tex]\large\underline{ \boxed{ \sf{✰\:Radio\:waves }}}[/tex]
▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂
The electromagnetic waves with the longest wavelength are radio waves .
Example:- television, mobile phones and radios.========================
Hope it helps!
pls help me i really need help
Graphs A, B, C, and D match the numbers 3,4,1, and 2 respectively.
What is the distance?Distance is a numerical representation of the distance between two objects or locations.
The distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.
Graph C shows a person leaving home and traveling at a constant speed.
Graph D shows a person leaving home, traveling at a constant speed, stopping for a short time and then returning home.
Graph A shows a person leaving home, traveling to their destination, and immediately returning.
Graph B shows a person leaving home, traveling at a constant speed, stopping for some time, and then continuing the journey away from home.
Hence, the numbers 3, 4, 1, and 2 are matched by graphs A, B, C, and D, respectively.
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an object with a density of 250 kg/m3 floats on water. what portion of the object is submerged?
The portion of the object submerged in water is determined as 0.25.
Fraction of the object submerged in waterThe fraction of the object submerged in water is calculated as follows;
S.G = (density of object) / (density of water)
where;
S.G is specific gravityS.G = (250 kgm⁻³) / (1000 kgm⁻³)
S.G = 0.25 = ¹/₄
Thus, the portion of the object submerged in water is determined as 0.25.
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please help
a piece of wood of mass 40g and uniform cross-sectional area of 2cm^2 floats upright in water. calculate the length of the immersed part of the wood
The length of the immersed part of the wood is 0.2m.
What is density?The density is the ratio of the mass and the volume of the object. It is denoted by ρ.
ρ = mass/Volume = m/V
Volume = Area of cross-section A x height h
Given is a piece of wood of mass 40g =0.04kg and uniform cross-sectional area A= 2cm² =2x10⁻⁴ m² floats upright in water.
The density of water ,ρ = 1000 kg/m³
The density related to length of part immersed is
1000 = 0.04/ (2x10⁻⁴ x h)
h = 0.2m
Thus, the length of the immersed part of the wood is 0.2m.
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4. Describe the process of fusion in the sun.
Answer:
In the core of the Sun hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.
Answer:
Hydrogen in the middle of the sun is being converted into helium. This helium that was just converted from hydrogen (air as we know it) is now called Nuclear Fusion.
Explanation: