Answer:
representative and liberal democracy
Explanation:
a representative democracy is an indirect democracy where sovereignty is held by the people's representatives. a liberal democracy is a representative democracy with protection for individual liberty and property by rule of law
What is the gravitational potential energy of a wrecking ball that is hung 20 meters above the ground if it has a mass of 200 kg?
Answer:
The gravitational potential energy of the ball is 39,200 J
Explanation:
Gravitational Potential Energy
It is the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
U=m.g.h
Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity or [tex]9.8 m/s^2[/tex].
The wrecking ball is hung at a height of h=20 m and has a mass of m=200 Kg. Substituting in the formula:
U=200*9.8*20
U = 39,200 J
The gravitational potential energy of the ball is 39,200 J
To Mr. H's disgust, a .450 kg black crow is raiding the recently-filled bird feeder. As Mr.
H runs out the back door with his broom in an effort to scare the crow away, it pushes
off the .670-kg feeder with a takeoff speed of 1.5 m/s. Determine the speed at which the
feeder initially recoils backwards.
The correct answer is 2.51 m/s.
The principle of conservation of momentum states that an isolated system's total momentum will remain unchanged in the absence of an external force. In other words, momentum cannot be created or destroyed but can only be changed by the action of forces as they are described by Newton's laws of motion.
Momentum is the product of an item's mass and its speed, and it is also equivalent to the entire amount of force needed to bring an object to rest.
From the conservation of momentum,
[tex]m_1 u_1 + m_2 u_2 = ( m_1 + m_2 ) v[/tex]
Substitute the values, to get the required speed,
[ ( 0.45 ) ( 0 )] + [ ( 0.67 )([tex]u_2[/tex])] = ( 0.45 + 0.67 ) ( 1.5 )
[tex]u_2[/tex] = 2.51 m/s
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During a baseball game, a batter hits a high pop-up. If the ball remains in the air for 4.06 s, how high above the point where it hits the bat does it rise? Assume when it hits the ground it hits at exactly the level of the bat. The acceleration of gravity is 9.8 m/s 2 .
The height of the point where it hits the ball is 20.171 m.
When a batter hits a ball high in a baseball game,
Time till the ball remains in the air, t = 4.06 seconds.
The acceleration of gravity, g = 9.8 m/s².
The vertex value of time is half of the time, the ball remains in the air
i.e. [tex]\frac{4.06}{2}[/tex] = 2.03 s
Final velocity (v) at the maximum height will be 0
So, According to the First Equation of Motion:
v - u = gt
u = - gt
u = -9.8 × 2.03
u = -19.894 m/s
Now, by using the Second Equation of Motion:
v² - u² = 2gh
Since v = 0
[tex]h = \frac{u^{2} }{2g}[/tex]
h = [tex]\frac{19.894^{2} }{2 * 9.81}[/tex]
h = 20.171 m
The ball will rise 20.171 meter high.
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A player hits a ball with a bat. The action is the force of the bat against the ball.
What is the reaction to this force?
Answer: Newton's third law of motion states that for every action, there is an equal and opposite reaction. When a player hits a ball with a bat, the force the player exerted on the ball through the bat gave the ball a push force in the forward direction.
Explanation:
Please help me I swear will mark you brainiest
Answer:
C
Explanation:
please mark as brainliest
For an observer who stays in one spot when the source of a sound is moving,
the sound wave's:
OA. amplitude increases.
B. amplitude decreases.
OC. frequency changes.
OD. speed increases.
Answer:
Explanation:
The correct option of the given question will be option © that is frequency changes.
According to the Doppler Effect, when source is moving towards the observer then the frequency increases and when the source is moving away from the observer then the frequency decreases, but the magnitude of the amplitude in both the cases will remain same. Whereas the speed of sound waves will remain constant as it was earlier. According to this effect, when there is a relative motion between the source and the observer then there will be the change in the frequency.
So, the correct answer will be that the frequency changes.
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A car weighs 3600 kg is traveling at 21. 0 m/s. The driver doesn?t notice a red light and rear-ends another car at rest. Both cars stick together and move with a speed of 9. 0 m/s. What is the mass of the car that was at rest?.
Answer:
[tex]4800\; {\rm kg}[/tex].
Explanation:
When an object of mass [tex]m[/tex] travels at a velocity of [tex]v[/tex], the momentum [tex]p[/tex] of that object would be [tex]p = m\, v[/tex].
Momentum is conserved immediately after the collision. Hence, the momentum that the [tex]3600\; {\rm kg}[/tex] vehicle lost in the collision would be equal to the momentum that the other vehicle has gained.
Momentum that the [tex]3600\; {\rm kg}[/tex] vehicle lost:
[tex]\begin{aligned}(\text{momentum change}) &= (\text{new momentum}) - (\text{original momentum}) \\ &= m\, v(\text{new}) - m\, v(\text{old}) \\ &= m\, (v(\text{new}) - v(\text{old})) \\ &= 3600\; {\rm kg} \, (9.0\; {\rm m\cdot s^{-1}} - 21.0\; {\rm m\cdot s^{-1}}) \\ &= (-43200)\; {\rm kg \cdot m \cdot s^{-1}}\end{aligned}[/tex].
The vehicle that was originally at rest would have gained that [tex]43200\; {\rm kg \cdot m\cdot s^{-1}}[/tex] of momentum. The momentum of that vehicle was [tex]0\; {\rm kg \cdot m \cdot s^{-1}}[/tex] before the collision since that vehicle was initially not moving. After gaining the [tex]43200\; {\rm kg \cdot m\cdot s^{-1}}\![/tex] of momentum, the new momentum of that vehicle would be [tex]p = 43200\; {\rm kg \cdot m\cdot s^{-1}}\!\![/tex].
Rearrange the equation [tex]p = m\, v[/tex] to obtain an expression for mass: [tex]m = (p / v)[/tex]. It is given that the velocity of this vehicle is [tex]v = 9.0\; {\rm m\cdot s^{-1}}[/tex] after the collision. Substitute both momentum [tex]p[/tex] and velocity [tex]v[/tex] into the equation [tex]m = (p / v)\![/tex] to find mass [tex]m\![/tex]:
[tex]\begin{aligned} p &= \frac{m}{v} \\ &= \frac{43200\; {\rm kg \cdot m \cdot s^{-1}}}{9.0\; {\rm m\cdot s^{-1}}} \\ &= 4800\; {\rm kg} \end{aligned}[/tex].
In other words, the mass of the vehicle that was originally not moving would be [tex]4800\; {\rm kg}[/tex].
How are sound waves similar to light waves?
Answer:
Sound and light are similar in that both are forms of energy that travel in waves.
Explanation:
They both have properties of wavelength, freqency and amplitude. ... Sound can only travel through a medium (substance) while light can travel through empty space. Sound is a form of mechanical energy caused by vibrations of matter.
Answer:
When light moves from one medium (like air) to another medium (like water) it will change directions. This is a "wave-like" behavior and is called refraction. In this way light behaves like other waves such as sound waves. The speed of the light wave also changes when it moves from medium to medium.
Explanation:
if it is summer solstice in the Northern Hemisphere, what is happening in the Southern Hemisphere
Answer:
Winter Solstice
If it took 3 hours to clean 6 houses, how many houses could be cleaned in 12 hours?
Answer:
24
Explanation:
If it took 3 hours to clean 6 houses than you can figure that is 2 houses per hours. so if there are 12 hours and 2 houses an hour, you multiply 12x2 and get 24. Another way to do it is to use proportions (aka two fractions that equal eachother):
3 hours 12 hours
---------------- = ---------------
6 houses number of houses
To calculate this, we can think about how we go from 3 to 12. Well, 3x4 is 12, so we got to 12 by doing multiplying by 4. So we can multiply 6 by 4 and you get 24.
Hope it helps! have a great day :)
can you please answer theese two qeastion
The first one is C!
I hope the answer helped! please mark brainliest and vote 5 stars! >:)
does anyone know any sites that you can use for physics for like homework
Answer:
the app your on now is great and can ask anything
pls solve this numerical.
Answer:
You should write the vectors in their proper sequence: i , j, k
If the vectors are perpendicular their dot product must be zero:
1) A dot B is obviously zero since A and B have no common terms in i , j , k
2) looks like A = 2 i - 4 j + 3 k and B = i + 2 j + 2 k
A dot B = (2 * 1) + (-4 * 2) + (3 * 2) = 0
Note that the dot product produces a scalar with no direction (vector components)
Only i dot i, j dot j, and k dot k have components i dot j = zero, etc.
Justin is a triathlete it takes him 28 minutes to finish the 1500 meter swim. 1.75 hours for the 40 milometer biking portion and 70 minutes for the 10 kilometer run. what is Justin's average speed for the triathlon?
Justin's average speed for the triathlon is 15.23km/h
Average speed is the total distance covered in total time taken.
(given) 28 minutes to finish the 1500 meter swim
1.75 hours for the 40 kilometer biking portion
70 minutes for the 10 kilometer run
total distance covered = 1500m + 40 km+ 10 km
= 51500m = 51.500km
(1km = 1000m)
total time taken = 28mint + 1.75hr + 70 mint
= 203mint
time in hours = 203/60 hr
(1hour = 60 mint)
average speed = total distance covered / time taken
= 51.5 x 203/60
= 15.23km/h
Justin's average speed for the triathlon is 15.23km/h
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part 1 of 2
A neutron in a reactor makes an elastic
head-on collision with the nucleus of an atom
initially at rest.
Assume: The mass of the atomic nucleus is
about 11.1 the mass of the neutron.
What fraction of the neutron's kinetic en-
ergy is transferred to the atomic nucleus?
part 2 of 2
In the initial kinetic energy of the neutron
is 1.77 x 10^-13 J. find its final kinetic energy.
Answer in units of J.
Answer:
for part 1 the answer is 0.303
Explanation:
The si unit of mass is the Newton. True or false.
interior crocodile alligator i drive a chevrolet movie theater
Answer:
nah bro tesla
Explanation:
4. To get to the sandwich shop, you left home and drove 6 miles south and then 10 miles west.
If a bird flew from your house to the sandwich shop in a straight line, how far do you think the
bird would fly? Use the simulation to check your reasoning.
. What direction should it fly from your house to get to the shop?
. Explain how you could use the simulation to answer these questions.
• Explain how you could use geometry equations to answer these questions.
If a bird flew from my house to the sandwich shop in a straight line, it would travel a distance of 10.44 miles.
The direction that it should fly from my house to get to the shop is at an angle 73.30°.
Pythagorean theorem-
The position vector are
OA = -6j AB = -10iBC=3j
where
O is the position of the house
C is the position of the shop.
Now drawing a perpendicular from C to OA at P we have,
Thus we have,
PC = 10i
PA = 3j
Thus,
OP = OA - PA = -6j + 3j = -3j
OC is the resultant of CP and OP
a) Thus the magnitude of OC
| OC | = √CP^2 + OP^2
= √ (10^2 +3^2) =10.44
b) The angle made by OC with OP
tan θ = OP/CP = 10/3
θ = 73.30°
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Using the rule-of-1 approach, what is the proportional change in centripetal acceleration, ac, for an object in a circular path when the tangential velocity is doubled? 2ac (doubles) 2 A sub c, (doubles) ac2 (halves) the fraction with numerator A sub c and denominator 2, (halves) ac4 (quarters) the fraction with numerator A sub c and denominator 4, (quarters) 4ac (quadruples)
Answer:
4ac (quadruples)
Explanation:
The general formula for centripetal acceleration is given as follows:
[tex]a_{c} = \frac{v^2}{r}\\\\[/tex] -------------- equation (1)
where,
ac = centripetal acceleration
v = tangential speed
r = radius of circular path
Now, if we double tangential speed, v' = 2v, then the acceleration will become:
[tex]a_{c}' = \frac{(2v)^2}{r}\\\\a_{c}' = \frac{4v^2}{r}[/tex]
using equation (1):
[tex]a_{c}' = 4a_{c}[/tex]
therefore, the correct answer is:
4ac (quadruples)
a student is rotating an object on a row that is 4.5 M long if we increase the length of the Rope so that the student rotates and uniform circular motion with the mass rotating 9.0 M away from the center of the rotation 2x farther what will be the effect of the tangential velocity for the athlete if we keep the time for one Revolution the same
Answer:
is there any options
Explanation:
explain how a fire alarm work
Answer:
Smoke alarms detect fires by sensing small particles in the air using a couple of different kinds of technologies. Once they detect those particles above a certain threshold, they signal the alarm to sound so that you and your family can get to safety and call 911. Smoke alarms save lives.
PLEASE HELP MEE
Ruben lifts a 125 Newton box up to the top of a shelf 2 meters high. How
much work (in Joules) did Ruben do?
Answer:
work = mgh = 125 × 2 = 250 joulesCan someone please answer this exactly correct and please no links
Answer:
jaja I don't remember it's been 6 years ago u don't remember nothing of that
What are the 5 basic types of reactions?
Answer:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion
Explanation:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories
Please find the average of the following numbers
9,10,100,50,20
Answer:
Average: 22.142857142857
Average =
Sum
Count
=
155
7
= 22.142857142857
Sum 155
Count 7
Median 23
Geometric Mean 16.412764443111
Largest 38
Smallest 2
Range 36
Answer:
15.4
Explanation:
how many laws are named after sir issac newton
Answer:
Three Laws
Newton's Three Laws of Motion. Sir Isaac Newton: The Universal Law of Gravitation. Sir Isaac Newton and the Unification of Physics & Astronomy.
Explanation:
Because most particles fired at metal foil passed straight through, rutherford concluded that.
Because most particles fired at metal foil passed straight through, Rutherford concluded that only a small area of an atom is positively charged called the nucleus.
Rutherford's atomic model states that the atom is a small-sized particle that is composed of other fundamental objects i.e. electrons, protons, and neutrons.
In the core of an atom, there is an extremely dense, tiny-sized object called the nucleus which is positively charged.
Moreover, the nucleus is the central point containing all the mass of an atom around which negatively charged particles revolve in circular paths called electrons.
To put it simply, this model suggests that when electrons interacted with atoms in gold metal foil, only a few changed their path after colliding with the massive dense nucleus.
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Water
Wood
Neon gas
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement
A)
wood, water, neon gas
B)
wood, neon gas, water
water, wood, neon gas
D
water, neon gas, wood
Answer:
I think the correct answer from the choices listed above is option A. The correct arrangement of the substances according to the most to the least ordered particle arrangement should be wood, water and neon gas. Wood should be the first since it is solid which has the most ordered structure as compared to the liquid and a gas. The neon gas is the last since as a gas it has the least ordered structure.
Answer:
A) wood, water, neon gas
Explanation:
wood, water, neon gas.
The particles of solids have an arrangement that is highly ordered and regular. Liquids have an arrangement that is less ordered, and the particle arrangement in gases is the least ordered and regular of the three states of matter.
tell me if im wrong .... hope this helps :)
What is an effect of La Nina?
A.) Alaskan fish populations increase
B.) Flordia
C.) Fish populations off the coast of Peru decrease
D.) South American becomes dire than normal
Answer: D
Answer:
D.) South American becomes dire than normal
Explanation:
La Niña effect can be regarded as an effect that has impacts on the global climate, this effect bring about disruption in normal weather patterns, as a result of this intense storms as well as drought is experienced. The effect could be intense by worsening of above temperature. It bring an increases the probability of having a rainfall below normal. As a result of this
South American becomes dire than normal.
In order to move a bag of dog food across a 10 meter room, you apply 20 newton’s of force. How much work was done?
A. 2 joules
B. 10 joules
C. 30 joules
D. 200 joules
The answer is 200 joules.
Answer:
Its answer is 200joule.
Explanation:
Hope it's helpful for you