Answer:
1200 Joules
Explanation:
PE = mgh
PE = 60 * 10 * 2
PE = 1200 Joules
The gravitational potential energy stored in a [tex]60 Kg[/tex] boy sitting at the top of a [tex]2 m[/tex] high slide is [tex]1200 J[/tex].
What is potential energy?Potential energy is the energy possessed by a body by virtue of its position relative to others.
[tex]U = mgh[/tex]
Where,
[tex]U =[/tex] potential energy
[tex]m =[/tex] mass
[tex]h =[/tex] height
[tex]g =[/tex] acceleration due to gravity
It represents the potential an object has to do work as a result of being located at a particular position in a gravitational field.
The energy that a ball has when placed at a top of a steep hill while it is about to roll down is an example of potential energy.
Given:
[tex]m = 60 Kg[/tex]
[tex]h = 2m[/tex]
Potential energy is
[tex]U = mgh\\U = 60*10*2\\U = 1200 J[/tex]
Potential energy is [tex]U = 1200 J[/tex]
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A battery supplies ________ to the circuit.
Answer:
Electrical energy
Explanation:
Hope It helps you
A small bar magnet pulls on a larger one with a force of 79 Newtons.
What is the magnitude of the force the larger one exerts on the smaller one?
Answer in units of N.
Answer:
79 N ( the same)
Explanation:
Noah plans on using a pendulum to determine the height of a tower. He attaches a mass to the end of a thin cord hanging from the tower's ceiling (let's assume the cord almost touches the ground). Noah determines the period of oscillation to be 12 s. How high is the tower?
The height of the tower is 35.75 m.
What is height?Height is the vertical distance between two points.
To calculate the height of the tower, we use the formula below.
Formula:
T = 2π√(L/g)............ Equation 1Where:
T = Period of oscillationπ = PieL = height of the towerg = acceleration due to gravity.From the question,
Given:
T = 12 sg = 9.8 m/s²π = 3.14Substitiute these values into equation 1 and solve for L
12 = 2(3.14)√(L/9.8)12 = 6.28√(L/9.8)√(L/9.8) = 12/6.28√(L/9.8) = 1.91L/9.8 = (1.91)²L/9.8 = 3.6481L = 9.8×3.6481L = 35.75 mHence, the height of the tower is 35.75 m.
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In this lab, you will need to be able to describe how multiple waves interact with each other. 1) This does not add too much mathematical complexity to the wave equation (Eq. 2), and 2) it allows us to develop a closer approximation of real-life situations as well (e. G. Interacting ripple patterns in a pond, music, atomic physics, etc. ). Here, you will explore the superposition of two waves, y1 and y2, where:
The superposition of waves due to their interaction can either produce a constructive or destructive interference.
What is wave superposition?Wave superposition refers to the the interaction of two or more waves when their parts overlap.
Example of wave superposition is multiple waves travelling through a rope.
The superposition principle states that when two or more waves overlap in space, the resultant disturbance is equal to the algebraic sum of the individual disturbances.
Based on phase difference between two or more waves, the superposition if the waves can result in either constructive or destructive interference .
Therefore, the superposition of waves due to their interaction can either produce a constructive or destructive interference.
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A new rechargeable battery pack is available for products that use aa batteries. Which of the following best explains how the data files in the table can be used to send a targeted e-mail to only those customers who have purchased products that use aa batteries to let them know about the new accessory?.
Answer:
D
Explanation:
Use the products file to generate a list of product IDs that use AA batteries, then use the list of product IDs to search the purchases file to generate a list of customer IDs, then use the list of customer IDs to search the customers file to generate a list of e-mail addresses
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Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?
(a) Solid sphere
(b) Hollow sphere
(c) Both will have an equal charge
(d) None of these
C
Let's see how
We know the rule
[tex]\\ \rm\rightarrowtail V=\dfrac{Kq}{r}[/tex]
[tex]\\ \rm\rightarrowtail Kq=vr[/tex]
[tex]\\ \rm\rightarrowtail q\propto r[/tex]
As radius is same charge will be same in both
Hence they both have same charge
How would you compare the direction of the motion of the reflected pulse with respect to the incident pulse
The direction of the motion of the reflected pulse is inverted to that of the incident pulse.
What is a Pulse?This is a physics term which refers to the single disturbance that moves through a transmission medium.
The reflected pulse is inverted so the direction is from right to left while that of the incident pulse is from left to right.
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An ideal gas, initially at a volume of 0.777778 L and pressure of 9 kPa, undergoes isothermal expansion until its volume is 7 L and its pressure is 1 kPa. Calculate the work done by the gas during this process. Answer in units of J.
For an ideal gas, initially at a volume of 0.777778 L, the work done by the gas during this process is mathematically given as
w=15.380613
What is the work done by the gas during this process.?Generally, the equation for the work done is mathematically given as
W=p1v1invfvi
Therefore
v2=p1v1/p2
v2=9*1.0.77778/1
v2=7.00002
In conclusion
w=7.00002ln7/0.777778
w=15.380613
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Although time is one of those concepts which we are all familiar with, it is difficult to define. We can say it is what is measured by a clock or that it is nature's way of seeing that everything does not happen at once.
What are your Thoughts on this?
do you think time is real?
Explanation:
time is nature's expression of change.
every change takes time.
it takes time to e.g. move from A to B.
at one point of time the universe is in one state, then some change happens, and the universe is in another state, and we have another point of time.
without time there is no change, without change there is no time.
Water is streaming downward from a faucet opening with an area of 3.0 x 10-5 m2. It leaves the faucet with a speed of 5.0 m/s. The cross sectional area of the stream 0.50 m below the faucet is:
The cross sectional area of the stream 0.50 m below the faucet is 2.54 x 10⁻⁵ m².
Speed of the water 0.5 m below the faucetThe speed of the water at the lower level is determined using Bernoulli's equation as follows;
P₀ + ρgΔh + ¹/₂ρv₁² = P₀ + 0 + ¹/₂ρv₂²
ρgΔh + ¹/₂ρv₁² = ¹/₂ρv₂²
gΔh + ¹/₂v₁² = ¹/₂v₂²
9.8(0.5) + ¹/₂(5)² = ¹/₂v₂²
2(17.4) = v₂²
34.8 = v₂²
v₂ = √34.8
v₂ = 5.9 m/s
Continuity equationA₁v₁ = A₂v₂
A₂ = A₁v₁ /v₂
A₂ = (3.0 x 10⁻⁵ x 5) / (5.9)
A₂ = 2.54 x 10⁻⁵ m²
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A corona is a circle of light that can be seen around the Moon during a solar eclipse.
O True
False
Atoms with certain characteristics are radioactive. Which of those below will
always be radioactive?
A. all atoms with more neutrons than protons
B. all atoms with an atomic number under 83
C. all atoms with fewer neutrons than protons
D. all atoms with an atomic number over 83
Answer:
D. all atoms with an atomic number over 83
343. W/M^2 of energy is emitted by the sun to the earth. How much actually reaches the earth's surface?
A. About one fourth
B. Almost all
C. About a third
D. About half
If 343 W/m² of energy is emitted by the sun to the earth, the quantity that reaches the earth is : ( D ) which is about half.
What is radiation?Radiation is the energy exchange that does not require a material medium for propagation.This is the process in which the sun exchanges heat with the earth.
Analysis:
When heat is exchanged between two bodies, heat is either, absorbed, transmitted or reflected. In the the cloud, energy is reflected back to the sun since the clouds are translucent, it allows a part to reach the clouds.
In conclusion, About half of this energy gets to the earth.
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Answer:
The correct answer is A. About one fourth.planation:
A planet has a mass 0.051 times the mass of Earth and a diameter of about 0.160 times the diameter of Earth. What is the acceleration of a body falling near the surface of this planet
Answer:
Gravity on planet is 2 times earth gravity
Explanation:
Grav force = G m1 m2 / (r^2) now change m1 and r
= G .051m1 m2 / ( .16 r)^2
= .051 /.0256 G m1 m2 / r^2
.051 /.0256 = ~ 2
Choose all the answers that apply.
Earth:
takes longer than 365 days to orbit the sun
has the most circular orbit in the solar system
has the largest satellite relative to its planet
has seasons because of a tilted axis
is a perfect sphere
Answer:
takes longer than 365 days to orbit the sun
has seasons because of a tilted axis
Note: We see 365 days for a year - from an external point of view, a year would take 366 days to orbit the sun - this is because it takes slightly less than 24 hours from sunrise to sunrise because of the rotation of the earth about the sun (a sidereal year is 366 days as compared to 365 days observed on earth)
The zone in which the greatest total mass of co2 is absorbed from the atmosphere.
The top layer is the zone in which the greatest total mass of co2 is absorbed from the atmosphere.
What is exosphere?The exosphere is the uppermost layer of Earth's atmosphere, located between 700 and 10,000 kilometers above the surface and merging with the solar wind at its summit.
The exosphere is a narrow, ambience space that surrounds a planetary contains particles that are gravitational forces connected to that body yet have such a low density that they are effectively collisionless.
Hence, the top layer is the zone in which the greatest total mass of co2 is absorbed from the atmosphere.
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5 A train of mass 1.5 X 105 kg is travelling at 40 ms-' when the brakes are applied and it decelerates steadily. The train travels a distance of 250 m before coming to a halt. (a) Calculate the deceleration of the train. (b) Find the average braking force.
Answer:
a)3.2m/s^2
b) -480,000N
Explanation:
mass of train= 150,000kg
velocity of train=40m/s
acceleration is negative
v^2=u^2-2as
v=0m/s
u=40m/s
s=250m
0=1600-500a
500a=1600
deceleration of 3.2m/s^2
newton's second law
F=ma
F= (150,000× -3.2)
F= -480,000N
Suppose you are pushing a stalled car. As the gets going, you need less and less force to keep it going. For the first 15 m, your force decreases at a constant rate from 210.0 N to 40.0 N. How much work did you do on the car? Draw a force-displacement graph to represent the work done during this period.
Answer:
1875 j
Explanation:
f * d = work
your AVERAGE force is (210+ 40)/2 = 125 N
125 * 15 = 1875 j
The work done during this period will be 1875 J.. if the body is displaced in the same direction of the force it will be positive.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work may be zero, positive and negative.it depends on the direction of the body displaced
The given data in the problem is;
F is the average force applied by the worker
d is the displacement = 15 m
The average force is ;
[tex]\rm F_{AVG} = \frac{F_1+F_2}{2} \\\\ F_{AVG} = \frac{210+40}{2} \\\\ F_{AVG}=125 \ J[/tex]
The work done by the worker will be;
[tex]\rm W= Fd \\\\\rm W= F_{AVG}d \\\\W= 125 \times 15 \\\\ \rm W=1875 \ J[/tex]
Hence the work done during this period will be 1875 J.
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A body travels a distance of 20m in the 7th second and 24m in the 9th second. How much distance shall it travel in the 15th second?
Answer:
36 m
Explanation:
We can consider this to be an AP.
Then,
a₇ = 20a₉ = 24Subtract a₇ from a₉.
a + 8d - a + 6d = 24 - 202d = 4d = 2a + 6(2) = 20a = 8Finding a₁₅
a₁₅ = a + 14da₁₅ = 8 + 14(2)a₁₅ = 8 + 28a₁₅ = 36 mFind rate of change
f(9)-f(7)/9-724-20/9-74/22m/sSo
Distance travel in 6 s
Speed×Time6(2)12mDistance in 15s:-
12+2436mWhich pair of triangles can be proven congruent by the hl theorem?
The pairs of triangles that can be proven congruent by the hl theorem is the right angled triangle.
What is mearnt be the HL theorm?The HL theorem is also known as the Hypothenus Leg theorem, it states that "the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right triangle, then the two triangles are congruent."
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Answer:
B
Explanation:
During which two moon phases would the amount of light reflected from the moon appear to be equal from Earth? Why does this occur at different times in a month? (AKS6a, DOK 3)
A.
The light reflected appears the same during the new moon and full moon phases because the sun, moon and Earth are aligned.
B.
The light reflected appears the same during the new moon and first quarter moon phases because the sun, moon and Earth are at the same angles.
C.
The light reflected appears the same during the full moon and third quarter moon phases because the sun, moon and Earth are at the same angles.
D.
The light reflected during the first quarter and third quarter moon phases appears equal because the sun, moon and Earth are at right angles.
The moon phase shows that D. light reflected during the first quarter and third quarter moon phases appears equal because the sun, moon and Earth are at right angles.
What is a moon phase?It should be noted that the moon phase simply means the portion of the moon that we can see from the Earth.
In this case, the light reflected during the first quarter and third quarter moon phases appears equal because the sun, moon and Earth are at right angles.
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A solid disk of mass (M) and radius (R) rolls without slipping with a linear speed of (v). Find the maximum vertical height (h) to which it can roll if it goes up an incline. Answer in terms of M, R, v, and g.
(I assume g is for gravity)
Answer:
1/2 M V^2 = M g H
Initial kinetic energy equals final potential energy
H = V^2 / (2 g) satisfies given conditions
An electon in a box absorbs light. The longest wavelength in the absorbtion spectrum is 700 nm . How long is the box
Answer:
8.01 (10^-10) m
Explanation:
use the Particle in a box equation
E = (n^2) (h^2) / (8 m (L^2))
and energy of a particle as its wavelength equation
h c / lamda = E
combine the equations to get
h c / lamda = (n^2) (h^2) / (8 m (L^2))
get L alone
L^2 = (2^2 - 1^2) h lamda / 8 m c
the longest wavelength is produced by a jump from the first excited state to the ground so
n = 2 to n = 1
so
L^2 = (n1^2 - n2^2) h lamda / (8 m c)
h = 6.6(10^-34) J*s
c = 3(10^8) m/s
m = 9(10^-31) kg
lamda = 700(10^-9) m
n1 =2
n2=1
A 2-column table with 3 rows. The first column titled metal has entries aluminum, iron, lead. The second column titled density (grams per cubic centimeter) has entries 2.64, 7.50, 11.34.
You have discovered a meteorite that seems to be metallic. Its mass is 370 g, and you calculate the volume to be 50 cm3. Based on the three values provided, which metal would most likely match the composition of the meteorite?
aluminum
iron
lead
none of these (density is less than 1.0)
Iron,
I really hope this helped you
Explanation:
Answer:
Its just Cork and wax
Explanation:
I just did it on edge trust me
2. It is to bring down the foot forcibly to the f a heavy step) with or without weight. 2 Ormain lateral position - This is done at sho
How does fission differ from fusion?
Explanation:
Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.
Explain how sound waves are created and how they travel
Answer:
Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.
Explanation:
Explain why we say that energy from the washing machine is wasted' as thermal energy?
Explanation:
In washing machine, the electrical energy is converted in kinetic energy then the mechanical energy is converted into thermal (heat) energy.
Light of different colors is emitted from different stars because :.
Answer:
Different temperatures
Explanation:
A planet's moon travels in an approximately circular orbit of radius 8.6 107 m with a period of 6 h 25 min. Calculate the mass of the planet from this information.
Answer:
m v^2 / R = G M m / R^2 gravitational attraction = centripetal force
M = v^2 R / G solving for M
period = 6 h 25 min = (6 * 3600 + 25 * 60) sec = 23,100 sec = T
v = 2 pi R / T
M = 4 pi^2 R^3 / (G T^2)
M = 39.5 * (8.6E7)^3 / (6.67E-11 * 2.31E4^2)
M = 39.5 * 636 / (6.67 * 5.34) * 10^24
M = 7.05 * 10^26 kg