False, the process of converting a solid into liquid at its melting point is called melting.
What is fusion ?
When two light atoms combine to form a new heavier nucleus this process is known as fusion. For example, when two hydrogen atoms combine to form helium atom.
Upon reaching a substance's melting point, the heat supplied by the substance (latent heat of fusion) causes the molecules to drift apart and the substance changes state (solid to liquid) by increasing its internal energy, resulting in a temperature decrease and a change of state (solid to liquid).
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24
Fig. 24.1 shows a liquid dropper used to draw a liquid from a bottle of
medicine. The squeeze bulb of the dropper is squeezed and then released
so that liquid from the bottle is sucked up into the tube of the dropper.
Explain how difference in air pressure enables liquid to be drawn into the
tube of the dropper.
Answer: It is due to the low air pressure in the stopper and the atmospheric pressure.
Explanation: Whenever is there is a pressure, there must be a force exerted. Because,
Pressure = Force/ Area
So, when the bulb of the dropper is squeezed, the air pressure inside the dropper decreases because all the air is forced out.
When the dropper is placed in a liquid and the squeezed bulb is released, the air pressure outside the stopper surrounding the liquid becomes high and forces the liquid inside the dropper.
The rise of the liquid into the stopper is due to the atmospheric pressure.
This is similar to drinking liquids using a straw.
why is the term impulsive of force coined
Answer: Impulse of force is a process of reducing and minimizing the impact of force on the object.
Explanation:
If an impact stops the moving object then the change in momentum will become a fixed quantity, extending the time of collision and reducing the time of impact.
For example, If a person jumps to the ground with a certain height the person will bend knees to extend the time of collision while hitting the ground and reducing the time of impact to prevent much injury.
A team of bicyclists are on bikes that require 512 J of work to ride. It takes 432 J of work for the bike to turn the gears. What is the mechanical efficiency of the bike?
Answer:
84.4 %
Explanation:
Mechanical efficiency = output work/input work × 100 %
output work = 432 J of work for the bike to turn the gears
input work = 512 J of work to ride.
Mechanical efficiency = 432 J/512 J × 100 %
= 0.844 × 100%
= 84.4 %
What is the KE of a 27 kg mass moving at 3m/s?
Answer:
121.5 J
Explanation:
Sunidhi made a study chart about changes in states of
matter.
Which headings best complete the chart?
X
melting
sublimation
Y
freezing
deposition
X: Solid Directly to Liquid
Y: Liquid Directly to Solid
OX: Liquid Directly to Solid
Y: Solid Directly to Liquid
O X: Heat Is Released
Y: Heat Is Absorbed
X: Heat Is Absorbed
Y: Heat Is Released
Answer:
freezing melting sublimating x y
x and
Explanation:
To drop a table of states of matter the best headings must be
table name: matter state
freezing melting sublimation x y
This order goes from the solid state to the gaseous state, which is obtained by introducing heat into the system
Answer: D on edge
X: Heat Is Absorbed
Y: Heat Is Released
Explanation:
sublimation and melting are both absorbing heat(aka getting warmer)as they change state while freezing and deposition are releasing heat(aka getting colder)as they change state
A spring has a spring constant of 105 N/m. If you compress the spring 0,1 m
past its natural length, what force does the spring apply?
(105 N/m) x (0.1 m) = 10.5 Newtons.
Answer:
(105 N/m) x (0.1 m) = 10.5 Newtons.
Explanation:
apex quiz
Se coloca una piedra de 600 g en una Honda de 50 cm y se la hace girar a una velocidad de 4 m/s. Dibuja la fuerza que ejerce la honda y calcula su módulo. ¿cómo afecta el peso a este caló? ¿Y su masa?
Answer:
Fc = 19.2 N
Explanation:
In this case, the force of the Honda over the rock, is a centripetal force. Then, you have:
[tex]F_c=m\frac{v^2}{r}[/tex]
m: mass of the rock = 600g = 0.6 kg
v: tangential velocity of the Honda = 4m/s
r: radius of the Honda = 50cm = 0.5m
You replace the values of m, r and v in the equation for Fc:
[tex]F_c=(0.6kg)\frac{(4m/s)^2}{0.5m}\\\\F_c=19.2N[/tex]
hence, the force has a magnitude of 19.2 N
If the rock would have more mass the centripetal force would be higher
what is most often given a value of zero to describe an object position on a srtaight line
Answer: A. Reference point
Explanation: A reference point is usually the start of a location, and if it's a starting point, then it will be 0.
Have a nice day. :)
A child drops a ball from a window. The ball strikes the ground in 3 seconds. What is the velocity of the ball the instant before it hits the ground?
Answer:
29.4 m/s
Explanation:
Given:
v₀ = 0 m/s
a = 9.8 m/s²
t = 3 s
Find: v
v = at + v₀
v = (9.8 m/s²) (3 s) + 0 m/s
v = 29.4 m/s
What happens to length of the mercury column if a small amount of water vapor is in the vacuum part?
Answer:
I hope it helped you...please mark as brainliest.....thanks!!!!!!!
Explanation:
Inches of mercury is ideal for vacuum lifting with vacuum cups, as the amount of vacuum required is rarely high. Typical vacuum handling utilizes anything between 15″Hg and 25″Hg. Therefore, “Hg is suitable as a measurement of system performance in this type of operation
The column of mercury employed in a mercury barometer, the height of which (inches of mercury) is used as a measure of atmospheric pressure.
At some point, all water vapour that is found in a vacuum system came from the atmosphere. Consider that air at 25° C and 50% relative humidity contains 12 torrs of water vapour. ... Additionally, any surface will adsorb a certain number of monolayers of water molecules.
Credits:
Vacuum Measurement: A Basic Guide - Fluid Power Journal
Sources of Water Vapor in Vacuum Systems | Normandale ...
what could be the plot of a story about planets/ astronomy?
Answer:
Some stars in space can come to life causing humans to be amazed but at thesame time in great/critical danger.
Answer:
I’m glad you asked!
Explanation:
So let’s just say it is Fiction.Science fiction is perfect because it is with space and science,but it is fiction.
Science fiction!
what is electrostatic force eg
Answer:
electrostactic force mean a force exerted from a charged object
eg :- a charged comb
Explanation:
hope this helps u stay safe
Explanation:
electrostatic force is the force that exist between electrically charged particle object at rest .
example of electrostatic force :- when we run a piece of paper with the oil in our head with the help of comb produced electrostatic force.
I need an answer ASAP, so if anyone can help right away that would be amazing!
A current-carrying wire with many loops is called
a magnetic field.
a wire coil.
a solenoid.
a bar magnet.
Answer: Solenoid
Explanation:
Answer:
Solenoid
Explanation:
I Point
How does the gravitational force betwqen two objects change if the mass of
one of the objects is doubled?
O A. The gravitational force decreases by a factor of 4.
B. The gravitational force increases by a factor of 4.
C. The gravitational force doubles.
D. The gravitational force decreases by half.
NEED HELP ASAP
Water waves and light waves are both examples to
Answer:
Transverse waves
Explanation:
Transverse waves are a type of wave that oscillates perpendicular to the direction of movement (the direction of propagation). These type of waves are usually represented by the sine or cosine functions due to the up and down oscillation of the waves.
In the case of water waves the thing that oscillates up and down are the water particles affected by the disturbance.
And for the case light waves what oscillates are the electric and magnetic fields, both oscillating perpendicular to the direction of light propagation.
Electrical conductivity in liquid solutions depends on the presence of free
Answer:
electrical conductivity in liquid solutions depends on the availability of free ions.
Calculate Amirul’s displacement from his house
Answer:
100m
Explanation:
[tex]80^{2} x60^{2} = 10000\\[/tex]
[tex]\sqrt{10000} = 100[/tex]
Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor if its total mechanical energy is 41.70 J? Round to the nearest tenth. m
Answer:
The correct answer to the following question will be "2.7 m".
Explanation:
The given values are:
Velocity, v = 16 m/s
mass, m = 0.27 kg
Mechanical energy, M.E = 41.70 J
g = 9.8 m/s²
As we know,
Kinetic energy, [tex]K=\frac{mv^2}{2}[/tex]
Potential energy, [tex]U=m.g.h[/tex]
Now, the total mechanical energy will be:
⇒ [tex]\frac{mv^2}{2}+U[/tex]
⇒ [tex]41,71 \ kg.m^2/s^2[/tex]
Now,
⇒ [tex]h=\frac{E-(\frac{mv^2}{2})}{mg}[/tex]
On putting the estimated values, we get
⇒ [tex]=\frac{41.70-(\frac{0.27(16)^2}{2})}{0.27\times 9.8}[/tex]
⇒ [tex]=\frac{41.70-(\frac{0.27\times 256}{2} )}{2.64}[/tex]
⇒ [tex]=\frac{41.70-34.56}{2.64}[/tex]
⇒ [tex]=\frac{7.14}{2.64}[/tex]
⇒ [tex]=2.7 \ m[/tex]
Answer:
2.7 m
Explanation:
A ball was dropped and had a mass of .2 kg and was falling with a force of 2 N, what was its acceleration?
Answer:
10m/s I believe
Explanation:
F=MA
A=F/M
A=2/0.2
A=10m/s
6. A 2.2 kg rock rests on the edge of a bridge that is 3.3 m above a river. What is the
gravitational potential energy of the rock when measured from the surface of the
river? What is the gravitational potential energy when measured from the edge of
the bridge?
Answer: 71 J
Explanation: The formula for gravitational potential energy is Epg= mgh.
So you plug in 2.2 as m, 3.3 as h and 9.81 as g. Once you do that you should get an answer of 71.2206. But because there are only two significant digits in the question, your answer must also have two significant digits.
The gravitational potential energy of the rock of 2.2 kg that is 3.3 m above the river is 71 J. The potential energy of the rock when measured from the edge of the bridge is zero where because rock is resting in the edge itself , so height will be zero.
What is gravitational potential energy ?Potential energy of an object is the energy generated by virtue of its position. Thus the energy is stored on the object when it rest. The energy stored on it when it is in a gravitational field is called its gravitational potential energy.
The gravitational potential energy of an object is given as follows;
p = mgh
where h is the height from the surface.
Given mass of the rock, m = 2.2 Kg
height = 3.3 m
g = 9.8 m/s²
then, p = 2.2 kg × 3.3 m × 9.8 m/s² = 71 J.
Therefore, the gravitational potential energy of the rock is 71 J.
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The function f(x)=−0.0025x2+0.243x+3 models the path of a rocket in feet. Explain how you would use the function to determine the height the rocket was launched from, how far it traveled, and the greatest height it reached. Answer in complete sentences.
Answer:
The quadratic function models the path of the rocket. When we substitute an x value, we can determine the height in feet of the rocket.
To determine the height it was launched from, we would look at the y-intercept. This represents the starting value, as time = 0 in this point (cannot have negative time).
To determine how far the rocket traveled, we would look at the positive x-intercept of the expression. At this point, height = 0, so we can see the distance from start to finish of the rocket.
To determine the greatest height achieve, we would look at the vertex of the parabola generated from the given function. Using (-b/a, f(-b/a)), we can determine the greatest height achieved.
A rock is rolling down a hill, and it’s halfway down. Would it have both Kintectic engery and Potenial engery? PLEASE HELP
Answer:
Only kinetic.
Explanation:
Potential energy means it has the potential to move. Not something already in motion.
Answer:
yes
Explanation:
it hasn't stopped moving so it still has kinetic energy and it hasn't reached what is considered 0 so yes it has both potential and kinetic energy
if you need more of an explanation let me know and ill fix it
what is friction? effect of force
Answer:
Force
Explanation:
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Dry friction is a force that opposes the relative motion of two solid surface in contact.
On the moon, the acceleration of gravity is 1.6 m/s2. If an object has a
mass on Earth of 5.1 kg, what is its mass on the moon?
Answer:
5.1 kg
Explanation:
Its mass on the moon is 5.1 kg because mass is an intrinsic property of a material and does not change with location. Although, its weight might vary because its acceleration of gravity g is dependent on the mass M and radius r of the planet(in this case, moon) involved g = GM/r². Since weight W = mg is dependent o g, weight varies but mass remains constant.
dunno the answer.. ¯\_(ツ)_/¯
What information can you infer from the Lewis structure diagram shown below?
A. Boron has six valence electrons.
B. Oxygen has six valence electrons.
C. Boron has five valence electrons.
D. Oxygen has five valence electrons.
Answer:
B
Explanation:
The picture shows 'O' for oxygen and is surrounded by six dots that represent valence electrons.
If a person is kicking there legs three times every four seconds what is the frequency.
Answer:
f = 0.75 Hz
Explanation:
It is given that, a person is kicking there legs three times every four seconds. We need to find his frequency. The number of times an event is occurring is called frequency of an object. The frequency of a person is given by :
[tex]f=\dfrac{n}{T}\\\\f=\dfrac{3}{4}\\\\f=0.75\ Hz[/tex]
So, the frequency of the person is 0.75 Hz.
A 3-ton Toyota land cruiser travelled at a speed of 45m/s, collides with a 2- ton comfort taxi which was parked in front of the traffic lights intersection. After the collision, both cars lock together and move off in one direction. Determine the speed of cars after collision.
Answer:
v = 27 m/s
Explanation:
To find the speed of cars after the collision you take into account the momentum conservation law. Total momentum of both cars before the collision must be equal to the total momentum of both cars after the collision.
After the collision both cars traveled together, then you have:
[tex]m_1v_1+m_2v_2=(m_1+m_2)v[/tex] (1)
m1: mass of the Toyota = 3-ton = 3000 kg
m2: mass of the taxi = 2-ton = 2000kg
v1: speed of the Toyota before the collision = 45m/s
v2: speed of the car before the collision = 0 m/s (it is at rest)
v: speed of both cars after the collision = ?
You solve the equation (1) for v:
[tex]v=\frac{m_1v_1+m_2v_2}{m_1+m_2}[/tex]
Next, you replace the values of the rest of the variables:
[tex]v=\frac{(3000kg)(45m/s)+0kgm/s}{3000kg+2000kg}=27\frac{m}{s}[/tex]
hence, just after the collision both cars have a speed of 27m/s
PLEASE HELP ME!
Which statement is NOT true about direct proportion?
A. direct proportion is a type of relationship between two variables
B. when one variable doubles, the other quadruples
C. when one variable doubles, the other doubles too
D. when one variable is zero, the other is also zero
Answer:
d
Explanation:
when one variables is zero ,the other is also zero
A spring had a spring constant of 48N/m. The end of the spring hangs 8m above the ground. How much weight can be placed on the spring so that the end of the spring is 2m above the ground
Answer:
28.8kg
Explanation:
h1=8m
h2=2m
h2-h1=6m
k=48 N/m
g=10m/(s^2)
w=F
10m=6*48
m=28.8kg
Explain how a battery works. What are some possible materials you could use to make a battery for a circuit?
Answer:
Batteries are systems that store chemical energy and then release it as electrical energy when they are connected to a circuit. Batteries can be made from many materials, but they all share three main components: a metal anode, a metal cathode and an electrolyte between them. The electrolyte is an ionic solution that allows charge to flow through the system. When a load, such as a light bulb, is connected, an oxidation-reduction reaction occurs that releases electrons from the anode while the cathode gains electrons
Explanation:
Answer:
a battery has chemical energy which stored in it in addition to that it has passive and negative charge
