Answer:
a) "gravitation" is the force causing you to go down a waterslide
b) It is "fluid friction" as a solid object (our body) moves over a fluid (the water)
c) It would become "sliding friction" since two solid surfaces slide over each other
d) fluid friction being the weakest friction, switching to sliding friction means a higher decrease in speed and therefore removing the water from a slide will decrease our speed
The blank
is the organ responsible for cleaning a person's blood.
A solid cylinder has a mass of 5 kg and radius of 2 m and is fixed so that it is able to rotate freely around its center without friction. A 0.02 kg bullet is moving from right to left with an angular momentum of 9 kgm2s just before it strikes the cylinder near its bottom and gets stuck at the outer radius. What is the angular velocity (magnitude and direction) of the cylinder bullet system after the impact
Answer:
0.893 rad/s in the clockwise direction
Explanation:
From the law of conservation of angular momentum,
angular momentum before impact = angular momentum after impact
L₁ = L₂
L₁ = angular momentum of bullet = + 9 kgm²/s (it is positive since the bullet tends to rotate in a clockwise direction from left to right)
L₂ = angular momentum of cylinder and angular momentum of bullet after collision.
L₂ = (I₁ + I₂)ω where I₁ = rotational inertia of cylinder = 1/2MR² where M = mass of cylinder = 5 kg and R = radius of cylinder = 2 m, I₂ = rotational inertia of bullet about axis of cylinder after collision = mR² where m = mass of bullet = 0.02 kg and R = radius of cylinder = 2m and ω = angular velocity of system after collision
So,
L₁ = L₂
L₁ = (I₁ + I₂)ω
ω = L₁/(I₁ + I₂)
ω = L₁/(1/2MR² + mR²)
ω = L₁/(1/2M + m)R²
substituting the values of the variables into the equation, we have
ω = L₁/(1/2M + m)R²
ω = + 9 kgm²/s/(1/2 × 5 kg + 0.02 kg)(2 m)²
ω = + 9 kgm²/s/(2.5 kg + 0.02 kg)(4 m²)
ω = + 9 kgm²/s/(2.52 kg)(4 m²)
ω = +9 kgm²/s/10.08 kgm²
ω = + 0.893 rad/s
The angular velocity of the cylinder bullet system is 0.893 rad/s in the clockwise direction-since it is positive.
If you stood on Mars and lifted a 15kg pack,you would be pulling with a force greater than...
Answer: See answers below.
Explanation: In this problem, we must be clear about the concept of weight. Weight is defined as the product of mass by gravitational acceleration.
We must be clear that the mass is always preserved, that is, the mass of 15 [kg] will always be the same regardless of the planet where they are.
where:
W = weight [N] (units of Newtons)
m = mass = 15 [kg]
g = gravity acceleration [m/s²]
Since we have 9 places with different gravitational acceleration, then we calculate the weight in each of these nine places.
Mercury
Venus
Moon
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
In this problem, we must be clear about the concept of weight. Weight is defined as the product of mass by gravitational acceleration.
We must be clear that the mass is always preserved, that is, the mass of 15 [kg] will always be the same regardless of the planet where they are.
where:
W = weight [N] (units of Newtons)
m = mass = 15 [kg]
g = gravity acceleration [m/s²]
Since we have 9 places with different gravitational acceleration, then we calculate the weight in each of these nine places.
Mercury
Venus
Moon
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto
Which statement accurately describes quantum mechanics and nanotechnology?
O Quantum mechanics has been used for several centuries to study small-scale systems.
O Quantum mechanics explains why very small systems behave similarly to large systems.
O Nanotechnology is a field that has been around for less than a century.
O Nanotechnology is small enough to show quantum effects, but large enough to build controllable devices.
Answer:
Explanation:
edge
Please hurry Describe why electric currents can be dangerous
Answer:
Cardiac Arrest, burns, and nerve damage.
Explanation:
Basically, the main risk is cardiac arrest, caused by the electric current interfering with the normal operation of the heart muscle. Other possible damages are burns due to the electric energy vaporizing the water inside the cells, and nerve damage caused by excessive current through the nerves.
which has the greatest frictional force among this surfaces
A.polished floor
B.tiled floor
C.wet floor
D.sandy floor
Answer:
D.sandy floor
Explanation:
hope this help you
defination of formula bar
The Formula Bar is where data or formulas you enter into a worksheet appear for the active cell. The Formula Bar can also be used to edit data or formula in the active cell. The active cell displays the results of its formula while we see the formula itself in the Formula Bar.
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can we build up an electric circuit without source of electric current
Answer:
No
Explanation: not possible
Answer:
if u go through this pdf mac\de by me few days ago, you can answer to your question perfectly, and you can know about electric circuit and others more and more.
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-ww.A
m = 15.0 kg
The block at Position A is released from the spring with 100 J of elastic potential energy. How
much kinetic energy does the block have at Position B? Explain how you know.
Answer:
v = 3.65 m / s
Explanation:
In this exercise we use the conservation of mechanical energy
starting point. Point A compressed spring
Em₀ = 100 J
final point. Point B uncompressed spring
Em_f = K = ½ m v²
energy is conserved
Em₀ = Em₀_f
100 = ½ m v²
v = [tex]\sqrt{ \frac{2 \ 100 }{m} }[/tex]
v = [tex]\sqrt {200/15}[/tex]
v = 3.65 m / s
Particles of light are known as A. electrons. B. neutrinos. C. photons. D. bosons.
Answer:
C. photons
hope this helps
have a good day :)
Explanation:
Answer:
The answer would be c
Explanation:
sally was trying to create a model the represents the composition of the galaxy. In her model, she needs to distinguish galaxies from other systems of celestial objects. which of the following best describes the composition of a galaxy?
Answer:
Planets, moons, asteroids and sun
How old are the hydrogen atoms in water?
Answer: 4.5 billion years
Explanation:
Some of the water molecules in your drinking glass were created more than 4.5 billion years ago, according to new research.
That makes them older than the Earth, older than the solar system — even older than the sun itself.
Lisa made the electromagnet shown. A nail with wire coiled around it has its head labeled S to the right and its point labeled N to the left. The end of the wire leading to the S is attached to the positive terminal of a battery. The end of the wire leading to the N is attached to the negative terminal of the battery. What can Lisa do to increase the strength of the electromagnet? She can use a nail with weaker magnetic properties. She can change the direction of the nail. She can increase the number of wire loops. She can reduce the current in the wire.
Answer:
C. She can increase the number of wire loops.
Explanation:
The more wire loops the more energy.
For a coil of wire, the magnetic field strength is increased by increasing the number of coils around the nail.
What is electromagnet?An electromagnet is a soft metal core shaped into a magnet by the passing the electric current through a coil surrounding it.
The end of the wire leading to the S is attached to the positive terminal of a battery. The end of the wire leading to the N is attached to the negative terminal of the battery. The current begins to flow. Current cant be changed to increase magnetic field strength, but the no of coils will definitely increase it.
Thus, To increase the strength of the electromagnet, Lisa can increase the number of wire loops.
Learn more about electromagnet.
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How much larger is the diameter of Jupiter compared to the diameter of Saturn?
FInish the lyircs! I am healthy I am wealthy
Answer:
I am rich, I am that bi*ch. I am gonna go get that bag and I am not gonna take your ****
Explanation:
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F = ma
F = 8.5 × 6
F = 51 N
................
Whenever an object exerts a force on another object, the second object exerts a force o the same amount, but in the ______ direction to that of the first object. (Fill in the blank)
Answer:
Opposite
Explanation:
Newton's third law of motion states that for every action there is an equal but opposite reaction.
Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move etc,
For example, while driving down the road, a firefly strikes the windshield of a car (Action) and makes a quite obvious mess in front of the face of the driver (Reaction) i.e the firefly hit the car and the car hits the firefly.
The ultimately implies that, in every interaction, there is a pair of equal but opposite forces acting on the two interacting physical objects.
Hence, whenever any physical object exerts a force (action) on another physical object, the second physical object exerts a force (reaction) of the same amount, but acting in opposite direction to that of the first physical object.
A rookie quarter back throws a football with an initial upward velocity component of 12.0 m/s and a horizontal velocity component of 20.0 m/s. Ignore resistance. How much time is required for the football to reach the highest point of the trajectory
Answer:
t = 1.22 s
Explanation:
Given that,
The initial upward velocity component of a football = 12 m/s
The horizontal velocity component is 20 m/s
We need to find the time required for the football to reach the highest point of the trajectory. Let the time is t.
Using first equation of motion to solve it such that,
[tex]v=u+at[/tex]
u is initial velocity
v is final velocity
a = -g
so,
[tex]t=\dfrac{u}{g}\\\\t=\dfrac{12}{9.8}\\\\t=1.22\ s[/tex]
So, the required time taken by the football to reach the highest point is 1.22 seconds.
Hello, can you help me? I have this question and I don't know how to answer it. Is a tire a conductor or an insulator? Thank you!
Answer: They're Conductors.
Explanation:
m = [1/√1-(v/c) 2 ]mo
An object whose rest mass is 2.0kg is accelerated to 0.9c. What is its relativistic mass?
Relativistic kinetic energy is KErel = (γ − 1)mc2. γ=1+1v22c2 γ = 1 + 1 v 2 2 c 2 . A binomial expansion is a way of expressing an algebraic quantity as a sum of an infinite series of terms.
Hope This Helps Youwhy did the transcontinental railroad lead to the end of pioneer era because.
Explanation:
It made commerce possible on a vast scale.
In addition to transporting western food crops and raw materials to East Coast markets and manufactured goods from East Coast cities to the West Coast, the railroad also facilitated international trade. ... Building of the Transcontinental Railroad, circa 1869.
A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighing 500 N is hanging from the board. The
tension in the right chain is 250 N.
Which of the following describes where the person is hanging?
Answer:
let Tension in the left chain is F
here, Fnet = 0
⇒F - 500N + 250 N - 125 N = 0
⇒F - 375 N = 0
⇒F = 375 N
let r from the left end of the board is the person sitting.
now torque at left end, τ = 0.
⇒375 × (0) - 500N × (r) + 250N × (4m) - 125 N × (2m) = 0
⇒0 - 500r + 1000 - 250 = 0
⇒750 = 500r
⇒r = 750/500 = 1.5 m
Explanation:
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what is Snell law of refraction????
Answer:
Snell's law of refraction also known as the second law of refraction which states:
The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant or given pair of Media .
When the sun and moon work together ____________ are formed on Earth.
a
Frankentides
b
Neap Tides
c
Spring Tides
d
Dark Tides
Answer:
C. Spring Tides is the answer.
what is the lowest frequency of a standing wave that has the fewest number nodes and antinodes
Answer:
Fundamental frequency
In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s . A served tennis ball is typically in contact with the racquet for 32.0 ms and starts from rest. The direction of the velocity of the ball just after it left the racquet is the positive x direction. Assume constant acceleration. Part A What was the x component of the ball's acceleration during this serve
Answer:
2.286 km/s²
Explanation:
Since acceleration a = (v - u)/t where u = initial horizontal velocity of ball = 0 m/s (since it starts from rest), v = final horizontal velocity of ball at serve = 73.14 m/s and t = time taken for serve = 32.0 ms = 0.032 s
Substituting the values of the variables into the equation, we have
a = (v - u)/t
a = (73.14 m/s - 0 m/s)/0.032 s
a = 73.14 m/s/0.032 s
a = 2285.625 m/s²
a = 2.285625 km/s²
a ≅ 2.286 km/s²
So, the x - component of the ball's acceleration during the serve is 2.286 km/s²
Calculate the potential energy stored in an object of mass 50 kg at a height of 20 m from the
ground.
(g=10 m/s2)
Answer:
potential energy=mgh
=50×10×20
=10000 J
Describe how to determine the thickness of a sheet of a paper without a caliper.
Answer:
Divide the total measurement of the stack/ream of paper by the number of sheets. For example: 2 inches/100 pages = 0.01-inches sheets.
In case you measured the stack, and it gave you less than an inch, then you need to do the same. For example: 0.5-inches/100 sheets = 0.005-inches per sheet.
Answer:
Divide the total measurement of the stack/ream of paper by the number of sheets. For example: 2 inches/100 pages = 0.01-inches sheets.
In case you measured the stack, and it gave you less than an inch, then you need to do the same. For example: 0.5-inches/100 sheets = 0.005-inches per sheet.
Explanation:
An object of mass m is acted upon by a net force F and experiences an acceleration of a. The same object is then acted upon by a net force of ½ F. What is the resulting acceleration in terms of a?
a. a
b. 2a
c. ½ a
d. ¼ a
Answer:
heyyyy
Explanation:
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What causes hot spot volcanoes to form?
Answer:
A volcanic "hotspot" is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. High heat and lower pressure at the base of the lithosphere (tectonic plate) facilitates melting of the rock. This melt, called magma, rises through cracks and erupts to form volcanoes.