Answer:
The size of a forceThe perpendicular distance from the pivot the line of action of forceExplanation:
Factors that affect the moment of a force are;
The size of a forceThe perpendicular distance from the pivot the line of action of forceThe magnitude of force applied is directly proportional to the moment of force in that for a perpendicular distance d, increased in force applied will result to a higher moment of force. When the perpendicular distance from the pivot is decreased while the force applied remains constant, the moment of force decreases.
What is the kinetic energy of a 74.0 kg man traveling in a car at a speed of 52.0 m/s?
A family is skating at an ice rink. The 58.2 kg mother is holding the
hand of her 35.5 kg daughter. The father grabs his wife's free hand and pulls horizontally with a constant force of 100. N. Assume that the skates glide without friction on the ice and that the family's hands andarms approximate ideal strings. How much net force does the daughter experience?
Answer:
When I got this question I had to draw it out so if you have to do that, draw 3 stick figures holding hands, one representing the mother, father, and daughter. Then you write their weights on top of them and then draw an arrow pointing from the father to the mother.
Explanation:
use this formula :
[tex]a_{y}[/tex] = [tex]\frac{Fdadshandy}{msys}[/tex]
then you fill it in :
[tex]a_{y}[/tex] = [tex]\frac{100N}{35.5kg+58.2kg}[/tex]
[tex]a_{y}[/tex] = [tex]\frac{100N}{93.7kg}[/tex]
[tex]a_{y}[/tex] = [tex]1.0672[/tex] [tex]m/s^{2}[/tex]
then you multiply that with the daughters weight :
[tex]T_{2} x= m_{2} a_{y}[/tex]
[tex]T_{2} x = 35.5kg (1.0672 m/s^{2})[/tex]
[tex]T_{2} x = 37.89N[/tex]
and that's the answer :) : 37.89N
What type of system is a black hole? Explain how you know.
Answer:
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.[1] The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.[2][3]
The boundary of the region from which no escape is possible is called the event horizon. Although the event horizon has an enormous effect on the fate and circumstances of an object crossing it, according to general relativity it has no locally detectable features.[4] In many ways, a black hole acts like an ideal black body, as it reflects no light.[5][6] Moreover, quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe directly.
Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace.[7] The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, although its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958. Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars by Jocelyn Bell Burnell in 1967 sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality.
Black holes of stellar mass are expected to form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses (M☉) may form. There is consensus that supermassive black holes exist in the centers of most galaxies.
The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. Matter that falls onto a black hole can form an external accretion disk heated by friction, forming quasars, some of the brightest objects in the universe. Stars passing too close to a supermassive black hole can be shred into streamers that shine very brightly before being "swallowed."[8] If there are other stars orbiting a black hole, their orbits can be used to determine the black hole's mass and location. Such observations can be used to exclude possible alternatives such as neutron stars. In this way, astronomers have identified numerous stellar black hole candidates in binary systems, and established that the radio source known as Sagittarius A*, at the core of the Milky Way galaxy, contains a supermassive black hole of about 4.3 million solar masses.
On 11 February 2016, the LIGO Scientific Collaboration and the Virgo collaboration announced the first direct detection of gravitational waves, which also represented the first observation of a black hole merger.[9] As of December 2018, eleven gravitational wave events have been observed that originated from ten merging black holes (along with one binary neutron star merger).[10][11] On 10 April 2019, the first direct image of a black hole and its vicinity was published, following observations made by the Event Horizon Telescope in 2017 of the supermassive black hole in Messier 87's galactic centre.[12][13][14]
Blackness of space with black marked as center of donut of orange and red gases
The supermassive black hole at the core of supergiant elliptical galaxy Messier 87, with a mass about 7 billion times that of the Sun,[15] as depicted in the first false-colour image in radio waves released by the Event Horizon Telescope (10 April 2019).[16][12][17][18] Visible are the crescent-shaped emission ring and central shadow,[19] which are gravitationally magnified views of the black hole's photon ring and the photon capture zone of its event horizon. The crescent shape arises from the black hole's rotation and relativistic beaming; the shadow is about 2.6 times the diameter of the event horizon.[12]
Schwarzschild black hole
Simulation of gravitational lensing by a black hole, which distorts the image of a galaxy in the background
Gas cloud being ripped apart by black hole at the centre of the Milky Way (observations from 2006, 2010 and 2013 are shown in blue, green and red, respectively).[20]
What is the energy transformation that takes place when a jumbo-tron video screen shows an instant replay? A. electrical to light B. mechanical to electrical C. light to chemical D. thermal to sound
Answer:
A. electrical to light
Explanation:
A jumbo-tron video is a very large television that is most times fitted into walls and displayed along the main roads. It has a light-emitting display(LED) property. Energy transformation is the conversion of energy from one form to another.
The video screen just as a regular television in the house emits light, sound and heat energies. Electrical energy which flows from one end to another powers the jumbo-tron video screen and is thus converted into light, heat and sound energies.
The energy transformation that takes place when a jumbo-tron video screen shows an instant replay is electrical to light energy.
Energy transformation is the conversion of energy from one form to another.
A jumbo-tron video is an electrical appliance that requires electricity to power on. When jumbo-tron video screen shows an instant replay, this shows that the jumbo-tron has been powered on using electricity and converted to light displayed by the video screen.Hence the energy transformation that takes place when a jumbo-tron video screen shows an instant replay is electrical to light energy.
Learn more here: https://brainly.com/question/20043384
Explain Thomsons model of an atom
please its aurgent fast
Answer:
Thomson's model showed an atom that had a positively charged medium, or space, with negatively charged electrons inside the medium. After its proposal, the model was called a "plum pudding" model because the positive medium was like a pudding, with electrons, or plums, inside.
B. Which of these uses the most power? Explain your answer.
1) 160 J of work in 8 seconds
2) 80 J of work is 4 seconds
3) 180 J of work in 9 seconds
Answer:
p=w/t
160/8=20
80/4=20
180/9=20
...so..all these uses equal power
A 735 kg object and a 1.37×1012 kg are located 2.59×104 m away from each other. What is the force due to gravity between the two objects?
Answer:
Fg=1.02*10^-4 N
Explanation:
Fg=Gm1m2/r^2
help its science
The average kinetic energy for atoms or molecules in a substance is called __________.
Group of answer choices
temperature
volume
heat
help plzzzzzzz i need thissssssssss
Answer:
The final graph
Explanation:
The graph that curves downwards is negative acceleration. While the position decreases the slop increases.
Problems - Show all work.
1. A carnival ride has a radius of 10.00 m and rotates at a speed of 3.00 m/s. Find the period of one complete revolution.
Given:
r=
v=
Unknown:
T=?
Equation:
v=2*pi*r/T
Answer:
21s
Explanation:
Given parameters;
Radius = 10m
Speed or velocity = 3m/s
Unknown:
Period = ?
Solution:
To solve this problem, use the expression:
v = [tex]\frac{2\pi r}{T}[/tex]
r is the radius
T is the unknown
Input the parameters and solve for T;
3 = [tex]\frac{2 x \pi x 10}{T}[/tex]
62.84 = 3T
T = 21s
A 15 kg block is sliding along a frictionless surface and strikes a 10 kg ball at rest. What is the collision of the blocks after the collision if it is an inelastic collision?
Answer:
v = 0.6 v₁
Explanation:
This is an exercise in collisions, let's start by defining a system formed by the two bodies, so that the forces during the collisions have been internal and the momentum is preserved.
Instant starts. Before the crash
p₀ = M v₁ + m 0
Final moment. After the crash
[tex]p_{f}[/tex] = (M + m) v
how momentum is conserved
p₀ = p_{f}
M v₁ = (M + m) v
v = [tex]\frac{M}{M+m} v_{1}[/tex]
let's calculate
v = [tex]\frac{15}{15+10} v_{1}[/tex]
v = 0.6 v₁
Showing results for a 4 olm and 8 ohm resistor are connected in series. The current through the 4 olm resistor is 2 amps. What is the current through the 8 olm resister?
Plzzzz help 20 points
Answer:
Let R1= resistance of 4ohms
R2= resistance of 8ohms
Equivalent resistance R will be
R=R1 + R2
=> 4+8=12ohms
The current through the two resistors will be the same since they are connected in series. Notwithstanding, the voltage will drop to appreciate the change.
Explanation:
The value of current from the 8-ohm resistor is the same as in the 4-ohm resistor which is equal to the 2 Amp.
What is resistance?Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
When two resistors are connected to the series in that condition the value of current is the same in both the resistors.
While the value of resistance is different in both the different.
Hence the value of current from the 8-ohm resistor is the same as in the 4-ohm resistor which is equal to the 2 Amp.
To learn more about the resistance refer to the link;
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How do an object's mass
and velocity relate to its
momentum?
If 100.0 g of a substance releases 45 kJ of energy as it cools from 13.0°C to –15.0°C, what is the specific heat capacity of the substance?
Answer:
16,071.42J/kgKExplanation:
The formula for expressing the quantity of heat released is expressed as;
Q = mcΔt
m is the mass of the substance = 100g - 0.1kg
c is the specific heat capacity of the substance
Δt is the change in temperature = 13 -(-15) = 28°C
Substitute and get c;
45000 = 0.1c(28)
2.8c = 45000
c = 45000/2.8
c = 16,071.42J/kgK
Hence the specific heat capacity of the substance is 16,071.42J/kgK
help with this please
Answer:
c
Explanation:
because because because
Answer:
b i believe
Explanation:
A car jumps off a ramp with a Kinetic energy of 5,000 joules. This same car has a gravitational potential energy of 4,685 joules at some point when it is falling to the ground, after jumping off the ramp. When the car lands on the ground, the springs of this car’s suspension compress and then come back to normal exerting an elastic potential energy of 4,968 joules.
What is the car’s total mechanical energy (TME)?
Answer:
14,653 J.
Explanation:
We know that,
Total mechanical energy is equal to the sum of all the potential and kinetic energies.
Given,
Kinetic energy when a car jumps off a ramp= 5000 J
Potential energy = 4685 J
Potential energy when the car lands= 4968 J
TME = 5000 + 4685 + 4968
= 14,653 J
Hence, the car's total mechanical engery is equal to 14,653 J.
The speed you read on a speedometer is ____.
Answer:
[tex]\leq 40[/tex]
Explanation:
So if you’re going 40mph, your speedometer may read up to 50.25mph - but it can never read less than 40mph. In order to stay within the law, carmakers calibrate their speedometers to slightly overreport their vehicles' speeds.
Which observation supports a model of the nature of light in which light acts as a wave?
A. Constructive interference
B. Temperature change
C. Blackbody radiation
D. Photoelectric effect
Answer:
Explanation:
Hope this helps!
Answer:
a. constructive interference
Explanation:
100% correct
current is a ______ quantity.
scalar or vector
Answer:
vector quantity............
Explanation:
Mark me braimlist
Answer:
scalar
Explanation:
help!! what are the blanks???
The earth receives energy from the sun in one day than all the energy consumed by humans in one year.
Amount of energy received from the sun
The sun provides around 174 petawatts of energy to Earth, of which 89 petawatts is absorbed by the planet.
The Global energy consumption is roughly 15 terawatts annually.
Thus, we can conclude that, the earth receives energy from the sun in one day than all the energy consumed by humans in one year.
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A cat walks 14 m in the positive direction on a number line, then turns around and walks 5 m in the opposite direction. What is the magnitude of the displacement of the cat? A. 9 m B. 14 m C. 19 m D. 24 m
Answer:
The answer is
A. 9 m
Explanation:
Step one:
given data
1. A cat walks 14 m in a positive direction.
2. Walks 5 m in the opposite direction.
Step two:
"The displacement can be defined as a quantity that refers to "how far out of place an object is, it is the object's overall change in position."
Hence the displacement is= 14-5= 9m
Which diagram shows a situation that would not produce an electric current in the wire?
Answer:B
Explanation:
A P E X
The diagram in which there is no current in the electric wire is B, the reason behind that it is not connected with the battery.
What is Electrical energy?When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible.
When two charge are in opposition to one another, they repel one another. The term "neutral" refers to an object has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand for taking into account quant phenomena.
Electrical charge is a preserved attribute, meaning that the net charged of an isolated system—that is, the sum of the positive and negative charges—cannot change. Particles at the subatomic level carry an electric charge.
The second diagram from the option will have no current in it because the wires are not connected with the battery, so the flow of current will not take place.
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2. A tower is 15.24 m high. At a certain distance away from the tower, an observer
determines that the angle of elevation to the top of it is 41°. How far is the observer
from the base of the tower?
Explanation:
Opposite side from the 41° angle = 15.24m
We wish to find the adjacent side (horizontal length)
Therefore 15.24m / tan41° = 17.53m.
Calculate the volume of water in gallons that 4.1 mL of water takes up. Express your answer in scientific notation,
Explanation:
The unit of volume derived from SI units(1) is the cubic meter, m3.
Chemists in a laboratory usually deal with much smaller volumes than cubic meters and the metric but non-SI units of liter or litre (L) and milliliter or millilitre (mL or ml) are in common use.
In 1964 the litre was redefined as being equal to exactly 1 cubic decimetre:
1 L = 1 dm3
So 1 milliltre = 1 cubic centimetre
1 mL = 1 cm3 (= 1cc)
Other metric units of measuring volume are given in the table below:
large volume → → → → → → → → → → small volume
name teralitre gigalitre megalitre kilolitre hectolitre decalitre decilitre centilitre millilitre microlitre nanolitre picolitre femtolitre attolitre
symbol TL GL ML kL hL daL dL cL mL µL nL pL fL aL
volume (L) 1012 L 109 L 106 L 103 L 102 L 101 L 10-1 L 10-2 L 10-3 L 10-6 L 10-9 L 10-12 L
HELP PLEASE FOR BRAINLIEST!
Find the volume of an object with a density of 3.1 g/mL and a mass of 12 g.
Answer:
Density = Mass/Volume => Volume = Mass/Density = 12/3.1 = 3.87ml
Explanation:
Answer:
3.9 mL
Explanation:
To find the volume of an object using its mass and density, we can use the following formula:
Volume = Mass/Density
Volume = 12/3.1
Volume ≈ 3.9
Therefore, the volume of the object is 3.9 mL.
I hope this helps!
Which type of matter is likely to absorb the most sound waves
A:hot air
B:metal door
C:foam wall:
D:Loudspeaker
Answer:
im postive its D) loudspeaker
Answer:
foam wall
Explanation:
ap3x
The moon has a mass of 7.34 . 102 kg and a radius of 1.74 . 106 meters. If you have a mass of 66 kg,
how strong is the force between you and the moon?
Answer:
[tex]F=1.06\times 10^{-18}\ N[/tex]
Explanation:
Given that,
Mass of the Moon, [tex]M=7.34\times 10^2\ kg[/tex]
Mass of the person, m = 66 kg
The radius of Moon, [tex]r=1.74\times 10^6\ m[/tex]
We need to find the force between the person and the Moon. The formula for the gravitational force is given by :
[tex]F=G\dfrac{Mm}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{7.34\times 10^2\times 66}{(1.74\times 10^6)^2}\\\\=1.06\times 10^{-18}\ N[/tex]
So, the required force is [tex]1.06\times 10^{-18}\ N[/tex].
how does light travel?
plaza help
Answer:
your answer will be the letter B
7. Two people are pushing a 40.0kg table across the floor. Person 1 pushes with a force of 490N
[W], and person 2 pushes with a force of 565N (N). If the coefficient of kinetic friction between
the table and the floor is 0.613, determine the acceleration of the table.(12.7m/s2 [49.1° Nofw])
Answer:
20.4 [tex]m/s^{2}[/tex]
Explanation:
To start doing this problem, first draw a free body diagram of the table. My teacher always tells us to do this, and I find that it is very helpful. I have attached a free body diagram to this answer- take a look at it.
First, let us see if Net force = MA. To do that, we need to determine whether the object is at equilibrium horizontally. For an object to be at equilibrium, it either needs to be moving at a constant velocity or not moving at all. Also, if an object is at equilibrium, there will not be any acceleration. But we know that there IS acceleration horizontally, so it cannot be in equilibrium. If it is not in equilibrium, we can use the formula ∑F= ma.
Let us determine the net force. Since the object is moving horizontally, we can ignore the weight and normal force, because they are vertical forces. The only horizontal forces we need to worry about are the applied force and force of friction.
Applied force = 1055 N (490 + 565)
Friction force= Unknown
To find the friction force, use the kinetic friction formula, Friction = μkN
μk is the coefficient, which the problem includes- it is 0.613.
N is the normal force, which we have to find.
*To find the normal force, we have to determine if the object is at equilibrium VERTICALLY. Since it has no acceleration vertically (it's not moving up/down), it is at equilibrium. Now, when an object is at equilibrium in one direction, it means that all the forces in that direction are equal. What are our vertical forces? Weight (mg) and Normal force (N). So it means that the Normal force is equal to the Weight.
Weight = mg = (40)(9.8) = 392 N
Normal force = 392 N
Now, plug it back into the formula (μkN): (0.613)(392) = 240.296 N
Friction = 240.296 N
Now that we know the friction, we can find the horizontal net force. Just subtract the friction force, 240.296 from the applied force, 1055 N
Horizontal Net Force: 814.704 N
Now that we know the net force, plug in the numbers for the formula
∑F= ma.
814.704 = (40.0)(a)
*Divide on both sides)
a = 20.3676 m/s^2
Round it to 3 significant figures, to get:
20.4 [tex]m/s^{2}[/tex]
What type of image is formed by a lens if m= 3.2?
A. One that is smaller than the object and virtual
B. One that is larger than the object and real
C. One that is larger than the object and virtual D. One that is smaller than the object and real
Answer:
c
Explanation: