Answer: D.
Explanation:
I just took a quiz im in highschool too and I got a 100
If you mix hot water and cold water in an isolated medium the mixture would have the temperature intermediate of the initial temperatures of the hot water and the cold water because of heat transfer.
How heat is transferred ?
Heat moves from higher temperature to lower temperature, a mixture of hot and cold water reaches an intermediate temperature. When hot water is placed over cold water, the denser cold water flows to the bottom, mixes with the hot water, and heats up.Energy is transferred from the hotter, or higher temperature, object to the colder, or lower temperature, object when two objects with different temperatures come into contact, until both are the same temperature. Once the temperatures are the same, there is no net heat transfer because the heat that is transferred from one object to another is the same as the heat that is returned.Changes in temperature are one of the main effects of heat transfer. The temperature rises when heated, while it falls when cooled. The change in a substance's temperature, the substance's mass, and certain phase-related physical properties are the three factors that, according to experiments, determine how much heat is transferred to or from a substance.Heat transfer takes place whenever there is a difference in temperature. Heat move might happen quickly, for example, through a cooking container, or gradually, like through the walls of a protected cooler.There are three distinct approaches to heat transfer: radiation, conduction, and convection. All three may occasionally occur simultaneously.To know more about heat transfer check this:
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How many charges do copper(II) and Carbide have?
Answer:They have 10
Explanation:
Two rams run toward each other. One ram has a mass of 49 kg and runs west
with a speed of 7 m/s, while the other has a mass of 52 kg and runs east with
a speed of 9 m/s. What will the momentum of the system made up of the two
rams be after they collide? Assume the total momentum of the system is
conserved
A. 811 kg-m/s west
B. 811 kg-m/s east
C. 125 kg-m/s west
O D. 125 kg-m/s east
S
Answer: (d)
Explanation:
Given
Mass of the first ram [tex]m_1=49\ kg[/tex]
The velocity of this ram is [tex]v_1=-7\ m/s[/tex]
Mass of the second ram [tex]m_2=52\ kg[/tex]
The velocity of this ram [tex]v_2=9\ m/s[/tex]
They combined after the collision
Conserving the momentum
[tex]\Rightarrow m_1v_1+m_2v_2=(m_1+m_2)v\\\Rightarrow 49\times (-7)+52\times (9)=(52+49)v\\\Rightarrow v=\dfrac{125}{101}\ m/s \quad[\text{east}][/tex]
Momentum after the collision will be
[tex]\Rightarrow 101\times \dfrac{125}{101}=125\ kg-m/s\ \text{East}[/tex]
Therefore, option (d) is correct
Match each sound feature to its description
amplitude
the density of the medium's particles
at the compressions of the wave
compression
the part of a wave where the particles
of the medium are farther apart
wavelength
the distance between compressions
or rarefactions
rarefaction
the part of a wave where the particles
of the medium are closer together
Intro
Done
tivity
be here to search
GOS
Answer:
1. Amplitude.
2. Rarefaction.
3. Wavelength.
4. Compression.
Explanation:
Sound are mechanical waves that are highly dependent on matter for their propagation and transmission. Some of the properties of sound waves as it travels through a medium such as solid, liquid and gas includes the following;
1. Amplitude: the density of the medium's particles at the compressions of the waves.
2. Rarefaction: the part of a wave where the particles of the medium are farther apart. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are separated by a greater distance.
3. Wavelength: the distance between compressions or rarefactions i.e the distance between two successive compressions or refractions.
4. Compression: the part of a wave where the particles of the medium are closer together. This ultimately implies that, it is part of a longitudinal wave in which the particles that make up the matter for the movement of the wave are closer together.
Answer:
here is the answers .......
Which statement about the mass of a falling object is correct? A.It decreases as the object falls. B.It increases as the object falls. C.It is equal to the weight of the object. D.It stays the same as the object falls.
Answer:
D.It stays the same as the object falls.
How does a resistor affect an electrical circuit?
Answer:
D
Explanation:
Answer:
D.
It reduces the rate at which electrons flow.
Glasses, cameras, flashlights, binoculars, telescopes and peepholes are all made using_lenses.
les ))
Answer:
convex
Explanation:
hope you have a good day!
how are a grassland ecosystem and a pond ecosystem connected?
Answer:
terrestrial ecosystem and pond ecosystem is an aquatic ecosytem, hence both their abiotic and biotic components would be different.
Explanation:
The relationship between body mass body weight and body density
Answer:
The formula for calculating Density is:
= Mass / Volume
From this formula, we can say that the relationship between Mass and Density is a direct one. In other words, if mass is increasing - all else being equal - then density will increase as well.
If mass however was decreasing, density would have to decrease as well.
For example, assume 3 bricks have masses of 5kg, 10kg and 15kg. Also assume that the bricks all have the same volume of 5 m³.
Density of 5kg brick = 5 / 5 = 1 kg/m³
Density of 10kg brick = 10 / 5 = 2kg / m³
Density of 15kg brick = 15 / 5 = 3 kg /m³
Notice how density increases as mass increases and decreases when mass decreases.
pls help me out i need help
Answer:
Angle of incidence. = Angle of reflection
0° = 0°
30°. = 30°
42°. =. 42°
60°. =. 60°
90°. =. 90°
angle of incidence is always equal to angle of reflection on plane surface
Hope it helps
* science*Name the two types of neutron stars.
Answer:
Radio pulsars and Recycled pulsars
Because fluid pressure increases witj depth, there is more fluid pressure_____ of a submerged object than on the ____
Answer:
Because fluid pressure increases with depth, there is more fluid pressure___outside__ of a submerged object than on the _inside___
Explanation:
As the object is submerged means that it is under water and not on the surface. It tells that water pressure exerting on the object from the outside is higher than inside which is why the object is submerged.
In the other case, the object will not remain submerged if its internal pressure is high, it will float on water.
How much force is needed to accelerate a 7.1 kg skier at 4 m/s/s?
Answer: 28.4
Explanation:
F=MA
F=(7.1)(4)
F= 28.4 N
A girl who is watching a plane fly tells her friend that the plane isn't moving at all. Describe a frame of reference in which the girl's description would be true.
The girl's reference frame must be moving with the same speed as the plane.
If an observer is stationary and he watches a car moving he can observe that the car has a momentum and is moving with certain speed. But if the observer is in the car or moving with same speed, the car does not appear to move away form the observer. Likewise, two observers moving with different speed will have different observation about the same car.
Similarly, if the girl describes the plane is not moving that means either she is in the plane or moving with the same speed along with the plane.
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A heater marked 60w evaporates 6×10^-3kg of boiling water in 60secs what is the specific latent heat of vaporization of water in jkg^-1
Explanation:
Latent heat of evaporation is the heat required to change water to vapor at the same temperature boiling temperature.(100°C)
That water turns into vapor when heated at temperature more than 100°C without any increase in temperature.
that is latent heat of vaporization Q = mL
Two in-phase sources of waves are separated by a distance of 3.50 m. These sources produce identical waves that have a wavelength of 5.96 m. On the line between them, there are two places at which the same type of interference occurs (a) Is it constructive or destructive interference, and (b) where are the places located?
Answer:
(a) It is a destructive interference
(b) The places at which destructive interference occur on the line between the two in-phase sources, are 1.07798 m before and after the two sources
Explanation:
(a) The given parameters are;
The distance between the two in-phase sources, d = 3.50 m
The type of waves produced by the two sources = identical waves
The wavelength of the waves produced by the two sources, λ = 5.96 m
For constructive interference, we have;
d·sin(θ) = m·λ
Where, m = 0, 1, -1, 2, -2, ...
For destructive interference, we have;
[tex]d \cdot sin(\theta) = \left(m + \dfrac{1}{2} \right) \cdot \lambda[/tex]
d·sin(θ) = Δl =
Where, m = 0, 1, -1, 2, -2, ...
Therefore, given that λ > d, for constructive interference
sin(θ) = m·λ/d > 1 for m > 0 which is invalid as the maximum value for sin(θ) = 1
Therefore, the possible interference is destructive interference
(b) For destructive interference, when m = 0, we have;
[tex]3.5 \times sin(\theta) = \left(0 + \dfrac{1}{2} \right) \times 5.96[/tex]
∴ sin(θ) = (5.96/2)/3.5
θ = arcsin((5.96/2)/3.5)
By trigonometry, we have;
tan(θ) = (d/2)/l
Where
l = The location along the line
∴ l = (d/2)/(tan(θ))
By substitution, we have;
l = (3.5/2)/(tan(arcsin((5.96/2)/3.5))) = 1.07798
Therefore, the two locations along the line where there is a destructive are 1.07798 m along the line before and after the two in-phase sources.
A body falling freely on the moon the acceleration due to gravity there is 1.7 m/s2.
a. its displacement at t = 3s
b. the time for it to reach a speed of 25 m/s
c. the time required for it to fall 300 m
d. its speed after falling 70 m
Answer:
a) 7.65 m
b) 14.71s
C) 15.43 m/s
Explanation:
a) s = ut + 0.5at²
s= ?
u = 0
t = 3s
a = 1.7 m/s²
s = 0 + 0.5 × 1.7 × 3²
s = 7.65 m
b) v = u + at
v = 25m/s
u = 0 m/s
a = 1.7 m/s ²
t = ?
v=at
t = v / a
t = 25 / 1.7
t = 14.71s
c) v² = u² + 2as
s = 70m
a = 1.7m/s²
u = 0 m/s
v = ?
v² = 2as
v = √238
v = 15.43 m/s
how is the flow of air important in designing the shape of a car?
Answer:
Explanation:
The more aerodynamic a vehicle is the less wind resistance there is meaning there is better gas mileage because it dont have to push so hard against wind and it also helps with the eye appeal
HELP HELP HELP I WILL MARK AS BRAINLIEST
Answer:
sun, jupiter, earth, moon
Explanation:
how big they are
Answer:
sun, jupiter, earth, moon. sun
Explanation:
The sun would have the biggest gravity because it is the massiest.
Based on the mass of each planet, this is the correct answer.
A boy pushes his baby sister on a swing in the playground. At the top
of the baby's path, she has a potential energy of 200 J.
How much potential energy will she have at the bottom of her path?
How much kinetic energy will she have at the bottom of her path?
Answer:
* If there is no friction U = 0, K = 200 J
* If there is friction U = 0, K = 200 - W
Explanation:
For this exercise we must make an assumption.
* If there is no friction
The energy of the system is conserved therefore the energy is transformed.
The potential energy is
U = m g h
at the bottom of the road there is no height therefore
U = 0
and all the energy has been transformed into kinetic energy
K = 200 J
* If there is friction, which can come from the internal friction of the car, the friction force between the car and the floor, etc.
in this case there is a loss of energy due to the work of non-conservative forces (friction).
The potential energy at the bottom of the path is hedron because there is no height U = 0
The kinetic energy is
K = U -W
K = 200 - W
where W is the work of the friction force.
Analyze the data from Data Table 2. As the mass of an object doubles, its kinetic energy
1. is halved
2. doubled
3. quadrupled
4. does not change
Answer: 2- doubled
Explanation:
Given
for m=0.02 kg, v=5 m/s, kinetic energy is 0.25 J
for same velocity and double mass i.e.
m=0.04 kg, v=5 m/s, kinetic energy is 0.50 J
same is with
m=0.08 kg, v=5 m/s , kinetic energy is double to [tex]2\times 0.5=1\ J[/tex]
So, on doubling the mass, kinetic energy is doubled
Consider a projectile. Which of the following describes y-motion? Check all that apply.
1. The y motion is a vertical motion.
2. The y motion is a horizontal motion
3. A projectile covers different distances per second in the direction.
4. A projectile covers equal distance per second in this direction
Answer:
1. True - gravity affects the y motion
2. False - x-coordinates affect the horizontal motion
3. y because gravity affects motion in the y-direction
4. x generally no external forces act in the x direction and hence no acceleration in the x direction
Two identical balls are thrown from the top of a cliff, each with the same speed. One is thrown straight up, the other straight down. How do the kinetic energies and speeds of the balls compare as they strike the ground?
A) The ball that is thrown straight up will have more kinetic energy but less speed than the ball that is thrown straight down.
B) The ball that is thrown straight up will have more kinetic energy and more speed than the ball that is thrown straight down.
Both balls will have the same kinetic energy and speed.
C) The ball that is thrown straight up will have more kinetic energy but less speed than the ball that is thrown straight down.
D) The ball that is thrown straight down will have more kinetic energy and more speed than the ball that is thrown straight up.
Answer:
the answer is B.
Explanation:
The ball that is thrown straight up has more kinetic energy and more speed than the ball that is thrown straight down. Both balls have the same kinetic energy and speed.
What is the kinetic energy and potential energy?The kinetic energy of a body can be determined as the energy of a moving physical system because of its motion. Work has to be done on an object to change its kinetic energy.
The kinetic energy of the moving system can be expressed as K.E. = ½mv² where ‘m’ is mass while ‘v’ is the velocity of the object.
The potential Energy of the physical system can be described as the energy stored due to its position. The mathematical formula for the calculation of the potential energy can be expressed in the form of P.E = m×g×h where ‘g’ is the gravitational acceleration, ‘m’ is the mass and ‘h’ is the height in meters
When two identical balls are thrown from a cliff, each with the same speed. One ball is thrown straight up, and the other ball is straight down. Both balls will have the same kinetic energy as well as speed.
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Which would have more volume, 1 kg of lead or 1 kg of copper? And EXPLAIN how you can tell.
Pls answer this ASAP for 15 points
What is the specific heat capacity of silver metal if 32.0 kg of the metal absorbs 55.0 J of heat and the temperature rises 21.0 C?
Answer:
Specific heat capacity of silver metal = 0.08184 J/kg°C
Explanation:
Given:
Mass of silver metal = 32 kg
Change in thermal energy = 55 J
Change in temperature = 21°C
Find:
Specific heat capacity of silver metal
Computation:
Using Specific heat capacity formula
C = ΔE / mΔT
where;
C = Specific heat capacity
ΔE = Change in thermal energy
m = Mass
ΔT = Change in temperature
C = (55) / (32)(21)
Specific heat capacity of silver metal = 55 / 672
Specific heat capacity of silver metal = 0.08184 J/kg°C
A lifeguard on a beach observes that waves have a speed of 2.60 m/s and a distance of 2.50 m between wave crests. What is the period of the wave motion? Please show all work. (ref: p.382-387)
Answer:
T = 0.96 seconds
Explanation:
Given that,
The speed of wave, v = 2.6 m/s
The distance between wave crests, [tex]\lambda=2.5\ m[/tex]
We need to find the period of the wave motion. Let T be the period. So,
[tex]v=\dfrac{\lambda}{T}\\\\T=\dfrac{\lambda}{v}\\\\T=\dfrac{2.5}{2.6}\\\\T=0.96\ s[/tex]
So, the period of the wave motion is equal to 0.96 seconds.
The period of the wave motion is 0.96 seconds. Using the formula:
v = λ / T
where v is the velocity of the wave, λ is the wavelength and T is the period of the wave.
Given that v = 2.60 m/s, λ = 2.5 m, hence:
2.6 = 2.5/T
T = 0.96 s
The period of the wave motion is 0.96 seconds.
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Can you help me please?
Answer:
a/ oscillating charges
State advantages and disadvantages of expansion of solid
Answer:
One of the most useful use of expansion by heat is for switches on many types of machinery and home appliances Thermostats in the millions of cars are operated by using the expansion of metal Thermometers are another example,
The disadvantages are just as common Railway lines need free movement d will buckle without sufficient clearance. Internal combustion engines need to be designed to allow for expansion and contraction of metal parts
Two identical charges exert a force of 4.5 x 10-2 N and each have charges of 2.5 x 10-6 C, what is the radius?
1.18 x 10-5 m
1.12 m
1.25 m
707.11 m
Help! (science class)
Answer:
opposite charges.
1. two Styrofoam.
2. pieces of glitter.
3. balloon moves away from glass rod
like charges
1. two sweaters cling
2. balloons stick to wall
3. stream of water bends
A 0.17 kg softball moving at 30 m/s is caught by a player. If the average force on the
player's hands during the catch is 500 N, find the time in which the ball came to a stop.
Answer:
0.35
Explanation:
ur dogwater