Given that,
Mass of the stone, m = 400 g = 0.4 kg
Initial speed, u = 20 m/s
It is climbed to a height of 12 m.
To find,
The work done by the resistance force.
Solution,
Let v is the final speed. It can be calculated by using the conservation of energy.
[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 12} \\\\v=15.33\ m/s[/tex]
Work done is equal to the change in kinetic energy. It can be given as follows :
[tex]W=\dfrac{1}{2}m(v^2-u^2)\\\\=\dfrac{1}{2}\times 0.4\times (15.33^2-20^2)\\\\=-32.99\ J[/tex]
So, the required work done is 32.99 J.
Can you hear this Picture???
If you know it, you get it
Answer:
Ah yes.. Beetlejuice
Explanation:
I hear it so well ngl
Define efficiency of a simple machine? Do you think that in actual practice the efficiency of a machine is 100°/•? If not, explain the reason?
Explanation:
Part 1 :
The efficiency of a simple machine is defined as the ratio of useful work done by the machine ( output work ) to the total work put into the machine ( input work ).
Part 2 : [tex] \boxed{ \sf{No}}[/tex]
In practice , the work output of a machine is always less than the work input due to the effect of friction. Since, there is always some loss of energy in the machine , if the frictional force in machines increases , efficiency decreases. Because machines are not frictionless in practice , efficiency of a machine is never 100% or greater.
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Question 1 (5 points) What is the frictional force acting on a 100 kg box as it moves across the floor with an acceleration of 1.5 m/s2, if the applied force is 300N? -150 N Ob 150 m/s2 C 150 N od -300 N Review Answers
Answer:HJKGFHJYKIUGFJDTGYKUGFJDSX
Explanation:65TTY6Y Y YY. ;D DDS
HVC BJCHGNMGHJFYIKUHYGFTR6457TY8IUOHJKGYTDYR567YUOI8HJKBGJMVHDTR5E46T7Y TFGDGHYUFVYH T7UYGHUGFTY Y6TURF67URY
The microwaves have a frequency of 1.8 x 10^9 Hz and travel at a speed of 3.0 x 10^8 m/s.
Calculate the wavelength of the microwaves. Give your answer to two significant figures
Answer:
0.17 m
Explanation:
The formula to apply in this question is that of speed of light.
The speed of the microwaves :
v = f * λ ------where f is frequency of the microwave, λ is the wavelength and v is the speed of the wave
3.0 x 10⁸ = 1.8 x 10⁹ *λ
3.0 x 10⁸ / 1.8 x 10⁹ = λ
λ = 0.16666666666
λ = 0.17 m { two significant figures}
ANSWER ASAPPP
Rosario’s science teacher gives her three liquid substances. The substances are red, clear, and blue. Rosario places the three substances in a graduated cylinder as shown.
What is the relative density of the substances given this arrangement?
densest: blue; medium dense: clear; least dense: red
densest: clear; medium dense: blue; least dense: red
densest: red; medium dense: clear; least dense: blue
densest: clear; medium dense: red; least dense: blue
Answer:
densest: blue; medium dense: clear; least dense: red
Explanation:
i've done this question before :)
Emma has a remote control toy quadcopter. She flies it but immediately loses sight of it. She knows it only flew for 2 minutes in a straight line before landing on the ground. Which of the following would best help her locate the missing toy?
A. weight of quadcopter
B. velocity of quadcopter
C. distance of flight
Answer:
C Distance
Explanation:
If she knows how far the plane went then she just goes that far from where it took off
How much power must an engine have to lift a 10,000 kg safe at a constant velocity to a 26 m height in 5 seconds?
Answer:
520kw or 520, 000w
Explanation:
Given that power equsls workdone /time taken
P=mgh
____
t
M=10, 000kg
h=26m
T=5sec
g=10m/s²
Recall:
P=mgh/t
P=10,000×10×26/5
P=20,000×26
P=520,000w or 520kw
When y⁷ is multiplied by y⁹ the answer is?
Answer:
y^16
Explanation:
who need to add the exponents only
7 + 9 = 16
therefore, the answer is y^16
what is everyone's take on time travel?
Answer:
Its not really possible I don't think. UNLESS! You fall into a manhole then find a wirling vortex in the sewers! : )
Explanation:
what caused the rate of the erosion to change around 1905 and 1906
Answer:
What caused the slope to change around 1905 and 1906? Building the Canadian hydroelectric plant reduced the rate of erosion after 1906. This change in the rate of erosion is represented by the change in the slope on the graph. Hydroelectric dams convert kinetic energy from moving water to electrical energy.
Answer:
In 1906, around the time the Canadian hydroelectric plant began operating, the erosion rate decreased to approximately 0.7 meters per year.
Explanation:
Gather data: Select Mercury from the Solar system menu at left. Turn on Additional data. In the table below, record Mercury’s Mass, Mean radius, and Density. Then repeat for each of the other planets as well as the dwarf planet Pluto. Include units.
Planet
Mass (×1023 kg)
Mean radius (km)
Density (g/cm3)
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto (dwarf planet)
Answer:
volume of substance of weight of mercury is 13593 kilograms
Which statement describes the heat that results from the radioactive decay of elements deep in the Earth's interior?
Answer:
Try C as the answer, if it works do the thanks button! :D
Explanation:
C) It drives the convection currents in the mantle.
The radioactive decay of elements in the Earth's mantle and crust results in production of daughter isotopes and release of neutrinos and heat energy.The radioactive decay in Earth's crust and mantle continuously adds heat and slows the cooling of the Earth.The heat from radioactive decay is thought to be distributed in the crust and mantle layers of the planet, greatly influencing currents in the mantle.Learn more:
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An atom of uranium 238 emits an alpha particle (an atom of He) and recoils with a velocity of 1.895 * 10^ 5 m/sec . With velocity was the alpha particle released ?
Answer: The velocity of released alpha particle is [tex]1.127\times 10^7m/s[/tex]
Explanation:
According to law of conservation of momentum, momentum can neither be created nor be destroyed until and unless, an external force is applied.
For a system:
[tex]m_1v_1=m_2v_2[/tex]
where,
[tex]m_1\text{ and }v_1[/tex] = Initial mass and velocity
[tex]m_2\text{ and }v_2[/tex] = Final mass and velocity
We are given:
[tex]m_1=238u\\v_1=1.895\times 10^{5}m/s\\m_2=4u\text{ (Mass of }\alpha \text{ -particle)}\\v_2=?m/s[/tex]
Putting values in above equation, we get:
[tex]238\times 1.895\times 10^5=4\times v_2\\\\v_2=\frac{238\times 1.895\times 10^5}{4}=1.127\times 10^7m/s[/tex]
Hence, the velocity of released alpha particle is [tex]1.127\times 10^7m/s[/tex]
Microwaves travel at the speed of light, 300,000 km/s. What is the wavelength of a microwave received at 1000 gigahertz?
Answer:
3 x 10⁻⁴m
Explanation:
Given parameters:
Speed of light = 300000km/s
Frequency = 1000gigahz = 1000 x 10⁹Hz
Unknown:
Wavelength = ?
Solution:
To solve this problem, we use the expression below:
V = F ∧
V is the speed
F is the frequency
∧ is the wavelength
300000 = 1000 x 10⁹ x ∧
Wavelength = 3 x 10⁻⁷km = 3 x 10⁻⁴m
Help, please! I really don't understand potential and kinetic energy
Answer:
C is the correct answer.
\\Choose the answer that is most descriptive the Milky Way Galaxy.//
A. Giant nebula's, star nurseries, gas clouds, binary stars.
B. Black holes, quasars, gamma rays, galaxy clusters.
C. 200-400 billion stars, 100,000 light years diameter, spiral arms.
D. Planets, stars, comets, asteroids, planet asteroids, moons.
Answer:
it is C i dont need no explanat
Explanation:
What are the two types of energy found in gravity?
Gravitational force and Potential energy
1
1 point
Which of the following is a true statement about light?
Light cannot be wave and a particle.
Light travels at the same speed as a really loud sound.
Light waves must have a medium in which to transfer energy
Light travels at 3.0 x 108 m/s in a vacuum.
Answer:
Light travels at 3.0 x 108 m/s in a vacuum.
Explanation:
Light travels at 3.0 x 108 m/s in a vacuum.
Calculate the force of gravity between two objects of masses 1300 kg and 7800 kg, which are 0.23 m apart.
Answer:
F = Gm1m2/r^2 where G = 6.67x10^-11, m1 =1300, m2 = 7800, r = 0.23m
F = 6.67x10^-11 *1300*7800/(0.23)^2 = 0.0127852N
Explanation:
help?? ASAP ill give brainlist
Answer:
i think its a wave length
Moji listed the solids in order of hardness as graphite < chalk < quartz. His
peer group suggested some experimental errors that may have caused this to
happen. Which experimental error most likely led Moji to this conclusion?
A. Moji might have used color as an indication of hardness.
B. Moji might have thought that crumbliness was a sign of softness.
C. Moji might have thought that crumbliness was a sign of hardness.
D. Moji could have chosen hardness tests that were not reliable.
Answer: D.
Explanation:
Moji listed the solids in order of hardness as graphite < chalk < quartz. because his peer group suggested some experimental errors that may have caused this to happen. The experimental error most likely led Moji to the conclusion that Moji could have chosen hardness tests that were not reliable. Therefore the correct option is D.
What is the matter?Anything which has mass and occupies space is known as matter, mainly there are four states of matter solid liquid gases, and plasma.
These different states of matter have different characteristics according to which they vary their volume and shape.
There are various tests to judge the mechanical hardness of any solid material such as the Rockwell hardness test, Brinell's hardness test,Vicker's diamond hardness test, and Knoop's hardness test which is also known as microhardness test
The experimental error most likely led Moji to the conclusion that Moji could have chosen hardness tests that were not reliable. Therefore the correct option is D.
Learn more about the matter here
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Which statement describes an example of destructive interference?
A. Light shining on a surface has gaps after passing through two slits.
B. Light shining on a DVD surface produces different colors.
C. The inside of a seashell appears to be many different colors.
D. A lamp lights an area around a corner.
It's A
Answer:
A
Explanation: Just did the test:)
e) Thermal energy is released during
some energy conversions.
True or false ?
F) If enough heat energy is absorbed by a liquid, the liquid solidifies.
True or false ?
Answer:
e) True, f) False
Explanation:
e) Let consider a close system, that is, a system with no mass interactions with surroundings. Then, we get the following expression by the First Law of Thermodynamics:
[tex]Q_{net,in} - W_{net, out} = \Delta U[/tex] (1)
Where:
[tex]Q_{net, in}[/tex] - Net input heat, measured in joules.
[tex]W_{net, out}[/tex] - Net output work, measured in joules.
[tex]\Delta U[/tex] - Change in thermal energy, measured in joules.
Please notice that work comprises all kind of work (i.e. mechanical, electric, magnetic), whereas heat comprises all heat interactions including chemical and radioactive phenomena.
If thermal energy is released, then [tex]\Delta U < 0[/tex], which is caused by three scenarios:
(i) [tex]Q_{net,in} < 0[/tex], [tex]W_{net, out} < 0[/tex], [tex]|Q_{net,in}|>|W_{net,out}|[/tex]
(ii) [tex]Q_{net, in} > 0[/tex], [tex]W_{net,out} > 0[/tex], [tex]|Q_{net,in}|<|W_{net, out}|[/tex]
(iii) [tex]Q_{net,in}< 0[/tex], [tex]W_{net, out}>0[/tex]
In the case [tex]Q_{net,in} > 0[/tex], [tex]W_{net, out} <0[/tex], the thermal energy of the system is increased. Therefore, thermal energy is released during some energy conversions. Answer: True
f) A liquid solidifies when temperature goes below point of fusion, meaning a realease of heat with no work interactions. That is:
[tex]Q_{net, in} = \Delta U[/tex], [tex]Q_{net, in} < 0[/tex] (2)
If [tex]Q_{net, in} < 0[/tex], then [tex]\Delta U < 0[/tex]. Then, if a liquid absorbs heat energy, then thermal energy is increase and the liquid does not solidifies. Answer: False.
The property that determines the physical behavior of a gas is?
Answer:
air is the answer your WC be safe
Roller coasters accelerates from initial speed of 6.0 M/S2 final speed of 70 M/S over four seconds. What is the acceleration?
Answer:
[tex]a=16\ m/s^2[/tex]
Explanation:
Motion With Constant Acceleration
It's a type of motion in which the velocity of an object changes uniformly in time.
The formula to calculate the change of velocities is:
[tex]v_f=v_o+at[/tex]
Where:
a = acceleration
vo = initial speed
vf = final speed
t = time
The roller coaster moves from vo=6 m/s to vf=70 m/s in t=4 seconds. To calculate the acceleration, solve for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
[tex]\displaystyle a=\frac{70-6}{4}=\frac{64}{4}[/tex]
[tex]\boxed{a=16\ m/s^2}[/tex]
Which type of wave interaction is shown in the diagram?
Answer:
Destructive inference
Explanation:
I just took the test
The type of wave interaction that is shown in the diagram is destructive interference. The correct option is C.
Destructive interference happens when two or more waves mix in such a way that they cancel each other out, causing the amplitude (or intensity) of the resulting wave to drop or disappear entirely at specific places.
The crests of one wave line up with the troughs of another wave when waves interact destructively.
Due to the individual waves' displacements being in opposition to one another as a result of this alignment, the net displacement is zero or has a small amplitude.
The superposition principle, which states that when two or more waves collide at a location in space, the resulting displacement is the sum of the individual displacements of each wave at that point, is what causes the destructive interference event.
Thus, the correct option is C.
For more details regarding destructive interference, visit:
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Your question seems incomplete, the probable complete question is:
Which type of wave interaction is shown in the diagram?
A. Constructive interference.
B, Diffraction interference.
C. Destructive interference.
A hoist lifts a 1200 N object a vertical distance of 15 m in 15 s. 18,000 J of work is done on the object to raise it at a constant speed. How much power is generated?
Answer:
1,200 W
Explanation:
18,000 J / 15s = 1,200 W
How do scientists classify species?
A. By comparing the ages of individuals
B. By comparing common names
C. By comparing who discovered them
D. By comparing traits
Answer:
D. By comparing traits
Explanation:
Because age isn't genetic, as well as names, as well as who discovered, but traits are genetic.
Answer:
D
Explanation:
A solution containing 3.4 moles of pl3 and one l water
Answer:
c
Explanation:
c
Which type of wave is represented in this picture?
Answer:
The first one with the rope would be a transverse wave and the second with the slinky would be a longitudinal wave