. Work done by a force depends upon force applied and displacement produced.
Which of the following is an example of an electromagnet?
A. The magnets used to lift metal or cars in a salvage/junk yard
B. the bar magnets we used in the lab
C.the magnets used to hold pictures on a refrigerator or papers on a metal filing cabinet
Answer:
A. The magnets used to lift metal or cars in a salvage/junk yard
Explanation:
An electromagnet is defined as a type of magnet which are made up of wires in coil shape. Magnetic field in these wires are produced by electric current.
An example of an electromagnet is magnets used to lift metal or cars in a salvage/junk yard because a crane is used in junkyard to lift metal in which crane is attached to a iron disc and when electricity is off, the disc move downwards and placed near required metal and switch on the electricity when disc reaches on metal or cars to be lifted. This electricity generates magnetism in the iron disc and attract metal or cars from the junkyard.
Hence, the correct answer is "A. The magnets used to lift metal or cars in a salvage/junk yard".
Kelly Clarkson is running between the Patronas towers in Kuala Lumpur on a tightrope at a speed of 15 m/s. Kelly currently weighs 79 kg. What is her KE?
KE = 8887.5 J
Further explanationGiven
speed = 15 m/s
weight = 79 kg
Required
KE-Kinetic energy
Solution
Energy is the ability to do work
Energy because its motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex]\large {\boxed {\bold {KE = \frac {1} {2} mv ^ 2}}}[/tex]
Input the value :
KE = 1/2 x 79 kg x 15² m/s²
KE = 8887.5 J
Answer:
KE = 8887.5 J
9. A 12 v battery is connected to four 5 ohm light bulbs. What is the equivalent
resistance for the bulbs in series? In parallel?
10. What would be the current through each light of problem 9?
For parallel circuit?
For series circuit?
-no bs answers
12. In which of the positions shown in the picture, will Joshua have both potential and kinetic energy?
Answer:
Answer: D. Only R
Explanation:
The Principle Of Conservation Of Mechanical Energy
In the absence of friction, the total mechanical energy is conserved. That means that
Em=U+K is constant, being U the potential energy and K the kinetic energy.
At the top of the path (point Q), Joshua is at rest but his height is at a maximum. Thus his kinetic energy is zero.
At point P, Joshua is at the minimum level (potential energy zero) and his speed is at a maximum.
At point R, Joshua has some height and some speed which means he has both types of energy.
Answer: D. Only R
How do simple
machines magnify
forces?
Answer:
Motion at one end of the beam results in motion at the other end in the opposite direction.
Explanation:
The location of the fulcrum can magnify (or reduce) the force applied at one end at the expense (or advantage) of the distance over which the other end travels. Sorry if I get this wrong! I am in 5th grade. ♥
what are food sorces of iron
Answer:
liver (but avoid this during pregnancy)
red meat.
beans, such as red kidney beans, edamame beans and chickpeas.
nuts.
dried fruit – such as dried apricots.
fortified breakfast cereals.
soy bean flour.
Explanation:
Two charges separated by one meter exert a 9 N force on each other. If the charges are pushed to a 3 meter separation, the force on each charge will be 3 N.
True or False?
Answer:
False
Explanation:
The formula of force that exists between two charges is expressed as;
F = kq1q2/r²
If two charges separated by one meter exert a 9 N force on each other, the;
9 = kq1q2/1²
9 = kq1q2 ..... 1
If the charges are pushed to a 3 meter separation, then;
F = kq1q2/3²
F = kq1q2/9 .... 2
Divide both equations;
9/F = (kq1q2)/ kq1q2/9
9/F = kq1q2 * 9/ kq1q2
9/F = 9
F = 9/9
F = 1N
Hence if the charges are pushed to a 3 meter separation, then the force on EACH charge will be 1N. Hence the answer is False
A tennis ball covers a distance of 12 meters in 0.4 seconds what is the velocity of the tennis ball?
Answer:
30m/s
Explanation:
Given parameters:
Distance = 12m
Time taken = 0.4s
Unknown:
Velocity of the tennis ball = ?
Solution:
Velocity of a body is the displacement per unit of time.
Velocity = [tex]\frac{displacement}{time}[/tex]
So;
Velocity = [tex]\frac{12}{0.4}[/tex] = 30m/s
Help in physics please. Need asap :(((
Answer:
which class you are studying hear the everything is based on the tangent line I didn't even handle this I am sorry
Astronomers classify galaxies by their shape. Which of the following terms describes a galaxy that looks like a round or flattened ball and contains little gas and dust between the stars?
A.
elliptical galaxy
B.
irregular galaxy
C.
No galaxies are shaped like a ball
D.
spiral galaxy
prove that total mechanical energy is always constant
Explanation:
We know that the overall mechanical energy of a device stabilizes in the absence of any external force. We know that that the total of potential and kinetic of the freely velocity vector remains same. ,So mechanical energy of a body, underneath gravitation, remains constant.
1)Describe the difference between an
energy transfer and energy store.
2)Give 3 examples of an energy transfer.
3)Give 3 examples of an energy store.
Answer:
1) Energy transfer is the movement of energy from one location to another. ... Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy.
2)A swinging pirate ship ride at a theme park. Kinetic energy is transferred into gravitational potential energy.
A boat being accelerated by the force of the engine. ...
Bringing water to the boil in an electric kettle.
3)Common examples of energy storage are the rechargeable battery, which stores chemical energy readily convertible to electricity to operate a mobile phone, the hydroelectric dam, which stores energy in a reservoir as gravitational potential energy, and ice storage tanks, which store ice frozen by cheaper energy at night
Explanation:
PLEASE MARK ME AS BRAINLIEST
Gravitational potential energy is due to....
a. mass and height above the ground
b. the amount of power an object has
c. the speed of an object
d. how far an object is stretched
Answer:
A
Explanation:
I only think its A because of the gravity part...sorry im not good at explaining
Force (N) = 250
Mass (kg) = 221
Acceleration (m/s^2) = ?
Answer:
The required acceleration is [tex]a=1.1[/tex] m/s²
Explanation:
Given
Force F = 250 NMass m = 221 kgTo determine
Acceleration a = ?
We know that acceleration is produced when a force is applied to a body.
The acceleration can be determined using the formula
[tex]F = ma[/tex]
where
F is the force m is the mass a is the accelerationnow substituting F = 250 , and m = 221 in the formula
[tex]F = ma[/tex]
[tex]250 = 221 (a)[/tex]
switch the equation
[tex]221(a) = 250[/tex]
Divide both sides by 221
[tex]\frac{221a}{221}=\frac{250}{221}[/tex]
simplify
[tex]a=\frac{250}{221}[/tex]
[tex]a=1.1[/tex] m/s²
Therefore, the required acceleration is [tex]a=1.1[/tex] m/s²
A young man exerted a force of 9,000 N on a stalled car but was unable to move it. How much work was done?
True or False Heat is the measure of the flow of thermal energy. *
True
False
Answer:
True
Explanation:
Answer:
that is very much true im pretty sure
(edit I was wrong its false)
Which statement best describes the atoms of elements that form compounds by covalent bonding?
They share electrons between them.
They have a large difference in valence electron number
They have a large difference in atomic mass.
They are in the same period in the periodic table.
Answer:
they share electrons between them.
Explanation:
taking the test rn lol i think its right
how many electrons does a neutral atom of the element iron (fe) have?
Answer:
26 electrons
A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus. As with other transition metals, a variable number of electrons from iron's two outermost shells are available to combine with other elements
Explanation:
hope this helps have a good rest of your night :) ❤
¿Qué trabajo realiza una carreta que contiene una de masa 800 lb de cemento si se desplaza 100 m por un suelo nivelado?
Answer:
Ver respuesta en el procedimiento
Explanation:
En este caso, necesitamos la expresión que nos permite hallar el Trabajo realizado por un objeto a través de una distancia dada. Esa expresión es:
W = F * x (1)
Donde:
W: Trabajo en Joules (J)
F: Fuerza en Newton (N)
x: Distancia o radio en metros (m)
En este caso, solo tenemos una masa de 800 lb, y la distancia que se esta recorriendo. No tenemos ningún dato adicional que nos diga si por ejemplo, es empujado por una persona o parecido, solo los datos de la masa que lleva la carreta. Por lo tanto, la única fuerza que podemos asumir se está ejerciendo, sería la fuerza del peso del objeto que se calcula así:
P = mg (2)
Donde:
g: aceleración de gravedad (9,8 m/s²)
Ahora bien si reemplazamos (2) en (1) nos queda:
W = mgx (3)
Y antes de realizar el cálculo debemos convertir la unidad de masa en libra a kilogramo, usando la siguiente conversión: 1 lb -----> 0,454 kg por tanto:
m = 800 * 0,454 = 363.2 kg
Ahora podemos usar (3) y calcular el trabajo:
W = 363,2 * 9,8 * 100
W = 355936 J o simplemente 355,936 kJ
Espero te sirva.
PD: También puedes usar el valor de gravedad como 10 m/s² y tendrás un resultado de 363200 J o 363,2 kJ.
A 1.5 kg block moves at 4 m/s
Answer:
12 joules
Explanation:
I'm assuming you're looking for kinetic energy?? Kinetic energy is 1/2 mv^2. 4 squared is 16, 16 times 1.5 = 24. 24/2 = 12.
Free fall acceleration
I need help?!!
Explanation:
if g is 10ms^-1
answers are
1-10
2-20
3-30
4-40
5-50ms^-1
A toy car is allowed to roll down a ramp during an experiment. While it is on the ramp, gravity acts on the car as an unbalanced force. Which of the following graphs best illustrates the car’s velocity as a function of time while it is on the ramp?
Answer:
When an unbalanced force acts on an object, the motion of the object is changed. If the object is at rest, the force makes it move. If the object is in motion, the force changes its velocity. Any change in velocity is acceleration
Explanation:
jayfeather friend me
Substances which naturally attract each other called what
Answer:
Ferromagnetism, physical phenomenon in which certain electrically uncharged materials strongly attract others. Two materials found in nature, lodestone (or magnetite, an oxide of iron, Fe3O4) and iron, have the ability to acquire such attractive powers, and they are often called natural ferromagnets.
Hope this help :)
A 136 kg defensive lineman is about to tackle a 100 kg quarterback. Right before
impact, the lineman is moving north at 6.0 m/s and the quarterback is moving
north at 1.0 m/s. Determine the speed and direction of the two players
immediately after the tackle.
Answer:
3.88 m/s North
Explanation:
We are given that
[tex]m_1=136kg[/tex]
[tex]m_2=100 kg[/tex]
[tex]v_1=6 m/s[/tex]
[tex]v_2=1m/s[/tex]
We have to find the speed and direction of the two players
immediately after the tackle.
Using linear conservation of momentum
[tex]m_1v_1+m_2v_2=(m_1+m_2)v[/tex]
Substitute the values
[tex]136\times 6+100\times 1=(136+100)v[/tex]
[tex]916=236v[/tex]
[tex]v=\frac{916}{236}[/tex]
[tex]v=3.88m/s[/tex]
Direction of the two players immediately after the tackle is North.
Insert the values
A train is traveling at a speed of 100km/hr for 3 hours. It then speeds up to 2 poin
150km/hr for the next 2 hours. How far has the train gone at the end of 5hours
Answer:
300km
Explanation:
To find the total distance traveled within the given time frame, we need to known that distance is the product speed and time;
Distance = Speed x time
For the first lap:
Distance = 100km/hr x 3hr = 300km
For the second lap;
Distance = 150km/hr x 2 = 300km
Distance = 300km + 300km
So;
Distance = 300km
all energy,potential kinetic within a specific system
a)joule
b) total energy
c) potential energy
Answer:
C
Explanation:
The potential and kinetic energy within a specific system is called the total energy of the system.
Option B is the correct answer.
Potential and Kinetic EnergyThe energy of the specific system due to its steady position is defined as the potential energy of the system.
The energy of the system which is stored due to the motion of the system is called the kinetic energy of the system.
The mechanical energy of the system is the total energy within the system including its kinetic and potential energy.
The sum of kinetic and potential energy is known as mechanical energy. An object's mechanical energy is defined as the total energy which is stored during its steady position and stored during the motion of the object.
Hence we can conclude that option B represents the correct answer for the given statement.
To know more about the potential and kinetic energy, follow the link given below.
https://brainly.com/question/21288807.
Help
Why do you think that if you drop two balls, exactly two balls rise on the other side at a
similar speed?
Answer:
It conserves both energy and momentum in the collision at the same time. By design, when the balls collide the strings that hold them up are vertical (assuming balls are only swung from one side).
Explanation:
Hope This Helps!!
A passive continental margin has a ____, while an active margin does not.
O A. continental rise
O B. continental slope
O C. continental duct
O D. continental shelf
A passive continental margin has a continental rise, while an active margin does not. Therefore, option A is correct.
What is passive continental margin?Where there is no plate border to mark the transition from land to sea, this is known as a passive continental margin.
A good example is the east coast of the United States, where the plate boundary is a distance from the shore along the mid-Atlantic ridge. Little geological activity occurs along passive borders.
Volcanoes, mountain belts, and earthquakes all identify active margins. They lack a continental uplift and an abyssal plain, in contrast to passive margins.
The Pacific and North American Plate boundaries are visible along the west coast of the United States, which is an example of an active margin. Where there is no plate border to mark the transition from land to sea, this is known as a passive continental margin.
Thus, option A is correct.
To learn more about the passive continental margin, follow the link:
https://brainly.com/question/11505884
#SPJ5
I'll mark brainiest if you help me
The electric force between two charged balloons is 0.12 newtons. If the distance between the two balloons is halved, what will be the new force?
A.
0.03 newtons
B.
0.06 newtons
C.
0.36 newtons
D.
0.48 newtons
Answer:
d. 0.48
Explanation:
