Answer:
No.
Explanation:
if it's in equilibrium then the torque or moment of inertia on both sides should cancel.
Torque is a vector quantity, force times distance.
When doing these, make sure your units are the same by changing centimeters to meters first.
Left side is 400N * (-2.5m) = -1000 Nm
Right side is 300N * (3.5m) = 1050 Nm
-1000 Nm + 1050 Nm does not equal zero so there's a torque on the teeter and it will rotate clockwise. The system is not yet in equilibrium.
Which statement about energy conservation BEST explains why a bouncing basketball will not remain in motion forever?
a The energy is used up and destroyed.
b The energy is transferred to light and potential energy.
c The energy is transformed to heat and chemical energy.
d The energy is transformed to sound and heat energy.
Answer:
d The energy is transformed to sound and heat energy.
Explanation:
Each time the basketball bounces, it makes sound waves, and dissipates energy in the form of heat in the material of the ball and the surrounding air. There is no light or chemical change involved.
A 4.0-kg ball has a momentum of 20.0 kg-m/s. What is the ball's speed?
Explanation:
Moving mass m = 4.0Kg
Momentum P = 20.0Kgm/s
Speed V = ?
Momentum = product of mass and its velocity
P = mV
V = P
m
V = 20
4
V = 5m/s
The ball's speed is 5 m/s.
What is speed?
Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
Given parameters:
Mass of the ball; m = 4.0Kg
Momentum of the ball; P = 20.0Kgm/s
We have to find; the speed of the ball; v = ?
We know that: Momentum of the ball = product of mass and its speed
⇒ P = mv
⇒ v = P/m
⇒ v = 20.0/4.0 m/s.
⇒ v = 5m/s
Hence, the speed of the ball is 5 m/s.
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You decide to work at a heart rate of 150 instead of 120. What area of F.I.T.T. did you change?
Key concepts
Heart rate
Exercising
The heart
Cardiovascular system
Health
Introduction
As Valentine's Day approaches, we're increasingly confronted with "artistic" images of the heart. Real hearts hardly resemble to two-lobed shapes adorning cards and candy boxes this time of year. And the actual shape of the human heart is important for its function of supplying blood to the entire body. You have likely noticed that your heart beats more quickly when you exercise. But have you ever taken the time to observe how long it takes to return to its normal rate after you're done exercising? In this science activity you'll get to do some exercises to explore your own heart-rate recovery time.
Background
Your heart is continuously beating to keep blood circulating throughout your body. Its rate changes depending on your activity level; it is lower while you are asleep and at rest and higher while you exercise—to supply your muscles with enough freshly oxygenated blood to keep the functioning at a high level. Because your heart is also a muscle, exercise, in turn, helps keep it healthy. The American Heart Association recommends that a person does exercise that is vigorous enough to raise their heart rate to their target heart-rate zone—50 percent to 85 percent of their maximum heart rate, which is 220 beats per minute (bpm) minus their age for adults—for at least 30 minutes on most days, or about 150 minutes a week in total. So for a 20-year-old, the maximum heart rate would be 200 bpm, with a target heart-rate zone of 100 to 170 bpm. (For those 19 or younger, target zones can vary more than they do for adults.)
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When the energy stored in the object is released it will turn into —————— energy.
Please fill in the blank.
Please someone answer this!! It’s my second time posting it!!!
Answer:
kinetic energy
Explanation:
Potential energy is stored energy.Kinetic energy is energy that a body possess as a result of its motion.
Gravitational potential energy is the energy stored in an object as the result of its height. The energy is stored as the result of the gravitational attraction of the Earth for the object
How man significant figures does the following value gave 43.023
Answer:
It has 5 I hope this helps you
Why are car radiators painted black?
Answer:
To absorb heat
Explanation:
A black color is said to absorb much heat . This helps in cooling the engine as the radiator has absorbed the heat efficiently .
Additional Information:
A black object absorbs all wavelengths of light and reflects non , that is why it appears black .The more light an object absorbs , the more heat it absorbs .What happens to the induced electric current if the number of loops is increased from one to three?
A. It stays the same.
B. It doubles in magnitude.
C. It triples in magnitude.
D. It decreases by a factor of three.
E. It decreases by a factor of two.
Answer:
C. It triples in magnitude (PLATO)
When the induced electric current, if the number of loops is increased from one to three, it triples in magnitude. The correct option is C.
What is induced electric current?A shifting magnetic field causes an induced current. An induced emf accompanies the induced current. Without a battery in the circuit, a current can be generated.
The induced emf can be described using Faraday's law of induction. Induction is the method of creating current in a conductor by exposing the conductor to a shifting magnetic field.
Since there is no actual physical link between the conductor and the magnet, this phenomenon is known as induction. The magnetic field is said to induce the current in the conductor.
Therefore, the correct option is C. It triples in magnitude.
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of the ball is
As the object falls off the roof of a tall building_______
turning into______
A) chemical potential energy; gravitational potential energy .
B) gravitational energy; kinetic energy .
C) chemical potential energy; kinetic energy.
D) kinetic energy ;gravitational potential energy.
Answer:b
Explanation:
velocity of a falling object increases.
so Kinetic energy of a falling object increases
height of a falling object from the ground decreases.
so the potential energy of a falling object decreases
2. An 85.0 kg cart is rolling along a level road at 9.00 m/s. The cart encounters a hill and coasts up the hill. a) Assuming the movement is frictionless, at what vertical height will the cart come to rest? b) Do you need to know the mass of the cart to solve this problem?
The height attained is 4.13 m and we do not need to know the mass of the cart to solve the question.
Mechanical energyThe term mechanical energy refers to energy possessed by a body by virtue of its position or its state of motion. There are two kinds of mechanical energy which are;
Potential energyKinetic energyFor the question, kinetic energy is equal to potential energy hence;
mgh = 1/2 mv^2
We can cancel out m on both sides such that
gh =1/2v^2
h = 0.5v^2/g
h = 0.5(9)^2/9.8
h =4.13 m
We do not need to know the mass of the cart to solve the problem.
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what is physical fitness? 1) the improvement of the body through inteninoal movement 2) the speed at which the body moves during exersize 3) the ability of the body to function of the body to function efficiently during exercise D) the preformence of mucles for long periods of time
Answer:
D) the preformence of mucles for long periods of time
Why is friction a problem in space travellers
The distance that sound waves travel in a given amount of time
is the
of sound.
Answer:
Speed of Sound
Explanation:
what is the definition of the speed of sound?
The speed of sound can be defined as the distance that sound waves travel in a given amount of time
Sound travels at different speeds depending on what it is traveling through. Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids.
The speed of sound in dry air is 343 meters per second.
Two trains on parallel tracks are traveling in the same direction. One train starts 10 km behind the other. It overtakes the first train in 2 hours . What is the relative speed of the second train with respect to the first train?
Answer:
[tex]v'=v_2-v_1=5\frac{km}{h}[/tex]
Explanation:
The relative speed between the trains is given by:
[tex]v'=v_2-v_1[/tex]
v1: speed of the first train
v2: speed of the second train
To find the relative velocity you write the equation of motion of both train by taking into account the information of the statement. The trains have constant velocity. Furthermore, the second train stars 10 km behind the other one. hence you have:
[tex]x=10+v_1t\\\\x=v_2t[/tex]
for t = 2 hours, the positions of both trains are equal, thus you have:
[tex]10+v_1t=v_2t[/tex]
you factor v2 - v1 from the last equation and replace t = 2h:
[tex]10=v_2t-v_1t\\\\10=(v_2-v_1)t\\\\v_2-v_1=\frac{10}{t}=\frac{10}{2}=5 \frac{km}{h}[/tex]
Hence, you have that the relative velocity is:
[tex]v'=v_2-v_1=5\frac{km}{h}[/tex]
7. A scientific theory can change if (2 points) nobody wants to believe it it becomes too old the scientist who discovered it dies we discover some new facts
Answer: this is true
Explanation: another one is if it is disproved
ASSIGNMENT
1. A resistance of 6ohms is connected in series with another of 3ohms. If a potential difference of 9V is applied across the combination, what is the p.d. across the 6ohms resistance.
Answer:
Equivalent resistance in series = 6 + 3 = 9 ohms
Current = V/R (ohm's law)
Current = 9/9 = 1 A
P.D. across 6 ohms = IR (ohm's law)
= 1A × 6Ω = 6V
Tear–free shampoos are advertised as having a pH similar to that of human tears. What pH would you expect tear–free shampoos to be?
Answer: 7
Explanation:
The pH of water, a neutral substance, is 7. Human tears are a saline composed mostly of water. Therefore, it stands to reason that a tear-free shampoo would have a similar pH close to 7.
Answer:
the pH level would be 7
Explanation:
If a 12 V battery is connected to a light bulb with a resistance of 2 ohms, how much current will flow through the light bulb?
Group of answer choices
A. 24 Watts
B. 0.5 amps
C. 6 amps
D. 6 ohms
Answer:
6amp
Explanation:
From Ohm's Law
V = IR
Where V = 12volts, R = 2ohms
12volts = I × 2ohms
I = 12/2
I = 6amp
The current flowing through the light bulb is 6amp
At what angle should two mirrors inclined to produced 10
images during reflection of a body?
Answer:
36°
Explanation:
let n=10 images
n=360/theta
10=360/theta
theta=360/10
theta=36°
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A ray of light strikes a plane mirror at an angle of incidence 35°. If the mirror is rotated through 10°.
i. what is the angle of reflection before rotating the mirror?
ii. through what angle is the reflected ray rotated?
iii. what is the angle between the incidence ray and the new reflected ray?
Answer:
1 35°
2 20°
3 50°
..............
A way of showing how energy moves through an ecosystem _________
Explanation:
Plants, as a autotrophs have chlorophyll to capture light energy from sun to make starch and sugar. Then, consumers eat plants, and the sugar is transferred to higher trophic level in a form of organic food. Nevertheless, energy is lost by uneaten food, indigestible food, unabsorbed food, excretory waste (eg co2) and heat loss by respiration.
Answer:
The Food Chain
Explanation:
The food chain is conducted of a web connected to three classifications. Each transfering energy to one a other when nutrients and living matter is passed from producers (one class) to consumers (another class), and is broken down by the decomposers (third class) lastly.
how mny hours does it takes you to travel by foot from australia to fiji
Answer:
About 22 hours in flight time.
Explanation:
It wouldn't give me the walking time.
Hope I helped ya.
< Sarah >
Answer:
Hmm idk u was tryna take the trip or sum
Explanation:
In a parallel circuit that has the same number and type of resistors as a series circuit the total resistance will be __________ and the total current will be ________. A.greater;greater B.lower;greater C.greater;the same D.the same;lower
Answer:
B. lower, greater
...............
A mass of 15 X 10^5 kg is held at a position 9 m away from a mass of 20 X 10^6 kg. What is the gravitational attraction between the two masses?
Answer:
The gravitational attraction between the two masses is 24.7 N.
Explanation:
We have,
Mass of object 1, [tex]m_1=15\times 10^5\ kg[/tex]
Mass of object 2, [tex]m_2=20\times 10^6\ kg[/tex]
Distance between masses is 9 m
We know that there exists a gravitational force between masses when they are placed at certain distance. The gravitational force between masses is given by :
[tex]F=G\dfrac{m_1m_2}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{15\times 10^5\times 20\times 10^6}{(9)^2}\\\\F=24.7\ N[/tex]
So, the gravitational attraction between the two masses is 24.7 N.
Muitos remédios são tomados em doses menores que o mg. Um comprimido de certo remédio tem 0,025 mg de uma certa substância. Com 1 kg desta substância, quantos comprimidos podem ser feitos?
Answer:
Explanation:
The question is asked in portuguese
Hence, it will be answered in portuguese
1kg = 1000g
e
1 g = 1000mg
então
1 kg = 1 x (1000 x 1000)
1 kg = 1x 1.000.000
1 kg = 1.000.000mg
assim
1 comprimido -------------> 0,025 mg
x comprimido ------------> 1.000.000 mg ( só cruzar)
0,025(x) = 1(1.000.000)
0,025x = 1.000.000
x = 1.000.000/0,025
x = 40.000.000
1kg são feitos 40.000.000( Quarenta milhões de comprimidos)De acordo com a sequência de substâncias listada na tabela ao lado, se atritarmos vidro com lã, o vidro ficará carregado positivamente. Qual será a carga da madeira quando atritada com: a) lã b) seda c) marfim
Answer:
a) Wood is positively charged when rubbed with wool.
b) Wood is positively charged when rubbed with silk.
c) Wood is negatively charged when rubbed against ivory.
a) A madeira é carregada positivamente quando esfregada com lã.
b) A madeira é carregada positivamente quando esfregada com seda.
c) A madeira é carregada negativamente quando esfregada contra o marfim.
Explanation:
English Translation
According to the sequence of substances listed in the table opposite, if we rub glass with wool it will be positively charged. what will be the charge of the wood when rubbed with a) wool? b) silk? c) ivory?
Solution
What will happen when two materials are rubbed on each other is due to the sequence on the static electricity table, with the materials arranged based on their tendencies to rub off electrons from one another.
Materials lower on the table can rub off electrons from materials higher on the table, thereby making the higher material positively charged.
a) Wood and Wool
Wood is higher than wool on this table, hence, wool easily rubs off electrons from the surface of the wood and leaves the wood with an overall more positive charges. Wood is positively charged after this.
b) Wood and Silk
Wood is higher than silk on this table, hence, silk easily rubs off electrons from the surface of the wood and leaves the wood with an overall more positive charges. Wood is positively charged after this.
c) Wood and Ivory
Wood is lower than ivory on this table, Hence, wood rubs off electrons from the surface of the ivory material and the overall charges on the wood is more negative. Wood is negatively charged after this.
In Portugese/Em português
O que acontecerá quando dois materiais forem esfregados um no outro é devido à sequência na tabela de eletricidade estática, com os materiais organizados com base em suas tendências de esfregar elétrons um do outro.
Os materiais mais baixos da mesa podem remover elétrons dos materiais mais altos da mesa, tornando o material mais alto carregado positivamente.
a) Madeira e lã
A madeira é mais alta que a lã nesta tabela; portanto, a lã retira facilmente elétrons da superfície da madeira e deixa a madeira com uma carga geral mais positiva. A madeira é carregada positivamente depois disso.
b) Madeira e seda
A madeira é mais alta que a seda nesta tabela; portanto, a seda retira facilmente elétrons da superfície da madeira e deixa a madeira com uma carga geral mais positiva. A madeira é carregada positivamente depois disso.
c) Madeira e Marfim A madeira é mais baixa que o marfim nesta tabela. Portanto, a madeira elimina elétrons da superfície do material de marfim e as cargas gerais na madeira são mais negativas. A madeira é carregada negativamente depois disso.
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2.09)
What would happen to two objects of different masses that are dropped in a
free fall where there is no air friction or any other forces besides gravity?
A. They would fall with an acceleration of 8.9 m/s2.
B. They would hit the ground at the same time.
C. The heavier object would hit the ground first.
D. Both objects would float away.
Answer:
b
Explanation:
If someone showed you two spheres of the same size but with different masses, say 1g and 10kg, and asked which would hit the ground first after being dropped from the Leaning Tower of Pisa, what would you say? If you’re like most people, you would say the 10kg sphere would hit the ground first. Aristotle said so too, and for 1,000 years everyone believed him. But doing the experiment would show you, besides a great view of Pisa, that in fact, both spheres hit the ground at the same time.This is exactly what Galileo did, showing the world that objects of different masses fall at the same rate. (This is also a good example of why it is important to do experiments yourself and not to just take someone else’s word for it.) To start understanding why Galileo was right, we need to understand the difference between several physics words that are often jumbled together and confused: mass, weight, speed, velocity, acceleration, and force.
Define 1 kg of mass as international standard
Answer:
1 kg is defined as the mass of a cylindrical Platinum iridium alloy whose height is equal to its diameter
What does an electromagnet do?
Name five (5) things.
Answer:
it is used on hard disk drives, speakers, motors, mri machines, and generators
Explanation:
there ya go
how light recats with each of diffrent types of space and materials
Answer:
Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection.
Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why?
Answer:
Because they would naturally dye the test strips in the colors violet and red, regardless of their pH values
(would really appreciate the brainliest)
Answer:
they are naturally dark/dying the strips.
Explanation: