Answer:
m₁ = 5.507 x 10⁻³ kg = 5.507 g
Explanation:
The heat released by the steam must be absorbed by the melting wax, according to the law of conservation of energy:
Heat Released by Steam = Heat Absorbed by Wax
Latent Heat of Fusion of Steam = Heat Absorbed by Wax + Latent Heat of Fusion of Wax
m₁H₁ = m₂CΔT₂ + m₂H₂
where,
m₁ = mass of water = ?
H₁ = Latent Heat of Fusion of Water = 2260 KJ/kg = 2.26 x 10⁶ J/kg
m₂ = mass of wax = 50 g = 0.05 kg
C = specific heat capacity of wax = (0.7 cal/g°C)(1000 g/1 kg)(4.184 J/1 Cal)
C = 2928.8 J/kg.°C
ΔT₂ = Change in Temperature of Wax = 55°C - 20°C = 35°C
H₂ = Latent Heat of Fusion of Wax = (35 cal/g)(1000 g/1 kg)(4.184 J/1 Cal)
H₂ = 146440 J/kg
Therefore,
m₁(2.26 x 10⁶ J/kg) = (0.05 kg)(2928.8 J/kg.°C)(35°C) + (0.05 kg)(146440 J/kg)
m₁ = (5125.4 J + 7322 J)/2.26 x 10⁶ J/kg
m₁ = 5.507 x 10⁻³ kg = 5.507 g
A car starts from rest and accelerates uniformly over a time of 10.21 seconds for a distance of 210 m. Determine the acceleration of the car.
Answer:
4.03 m/s/s
Explanation:
d=1/2 a t^2
210 = 1/2 a (10.21)^2
210 = 52.1 a
a = 4.03 m/s/s
A repelling force occurs between two charged objects when the charges are of Equal magnitude. Equal magnitude. a Unequal magnitude.b Unequal magnitude. c Like/same signs.d Like/same signs. e Unlike signs. help plz
Answer:
c Like/same signs
Explanation:
A repelling force occurs between two or more charged objects with the charges are of like or same sign.
According to Coulombs law, like charges repel on another, unlike charges attracts on another. If a positive charge comes into the vicinity of another positive charge, there will be repulsion. When oppositely charge species are brought near each other, there is an attraction.Therefore, repulsion occurs when like charges are brought close to each other.
PLS HURRY Give two ways that citizens can influence the technology that affects
them. *
Answer:
They can use it to help them get a job, for example, tech typically have apps to help aid the citizen.
They can use their technology to try and make their life style easier for example, Google Home.
Find the mass of the car.
[tex]\huge\boxed{770.8\overline{3}\ \text{kg}}[/tex]
We know that force equals mass times acceleration, so substitute in the known values and solve.
[tex]\begin{aligned}F&=ma\\1850&=m*2.4\\1850\div2.4&=m*2.4\div2.4\\\boxed{770.8\overline{3}}&=m\end{aligned}[/tex]
Sandy wanted to find out
Answer:
I prefer to write the full question.....I think you should too.....or this is just free points?
A ball is moving at 4m/s and has a momentum of 40 kg m/s.What is the balls mass
Answer:
10kg
Explanation:
mass=momentum÷velocity
Potential energy results from the ______or position of an object.
Answer:
Mass
Explanation:
Passengers fall forward when a bus suddenly stops. Using your knowledge of Newton's First Law and Inertia, explain why this phenomenon happens.
Answer:
The people on the bus fall forward because Newton's Law of Inertia states that and object in motion with stay in motion or an object at rest will stay at rest unless acted in by another force. The force of the bus stopping suddenly caused the passengers to fall forward because they were at rest position.
Are you gay if you are why?
Answer:
Because of the chemical makeup of my DNA
Answer:
I'm not gay, but if you play xbox you are,
Explanation:
hehehhehehehehehehhehehehehehehehehehehheheehehhehehehehehheeeeeeeee
How does reducing the mass of a moving object by half (1/2) change its kinetic energy?
Cody lives in Florida along the eastern coast. The kind of air mass likely to occur
over his region would be
Choose...
. It would develop here because
Choose...
.
What is the force due to gravity of a 38 kg student?
Answer:
F_g = 372.78 N
Explanation:
Formula for force of gravity is;
F_g = mg
Where;
m is mass
g is acceleration due to gravity
We are given;
Mass = 38 kg
Acceleration due to gravity has a constant value of 9.81 m/s²
Thus;
F_g = 38 × 9.81
F_g = 372.78 N
THIS IS DUE TOMORROW! WILL GIVE BRAINLIEST!!
6. How does sea-floor spreading explain why the youngest rocks are found near the mid-Atlantic ridge?
Answer:
With distance from the ridge crest, the sediments and crust get thicker. This also supports the idea that the youngest rocks are on the ridge axis and that the rocks get older with distance away from the ridge (Figure below). Something causes the seafloor to be created at the ridge crest.
Answer: With distance from the ridge crest, the sediments and crust get thicker. This also supports the idea that the youngest rocks are on the ridge axis and that the rocks get older with distance away from the ridge (Figure below). Something causes the seafloor to be created at the ridge crest
Explanation:
New rock is formed near the mid-oceanic ridge as oceanic plates diverge or separate from each other. Hot rocks rising from the asthenosphere melt from decompression as they rise, filling the fault and forming new basaltic oceanic crust. As new crust is added, older crust is pushed away. Therefore, the further away from the mid-oceanic ridge, the older the rocks.
If you drop a rock from 490 meters high, how long will it take the hit the ground? (Remember to make height negative when solving because it is falling)
A. 12.88 Seconds
B. 7.88 Seconds
C. 5 Seconds
D. 10 Seconds
Answer:
C
Explanation:
A beach ball, moving with a velocity of 2 m/s, rolls off a pier and hits the water 0.5 m from the end of the pier. It strikes the water 0.25 seconds later. How high is the pier above the water? Disregard air resistance. 1.23 m 0.31 m 0.61 m 2.45 m
Answer:
0.31 m
Explanation:
The following data were obtained from the question:
Horizontal distance (s) = 0.5 m
Horizontal velocity (u) = 2 m/s
Time (t) = 0.25 s
Height (h) of the pier =.?
The height of the pier can be obtained as illustrated below:
Time (t) = 0.25 s
Acceleration due to gravity (g) = 9.8 m/s²
Height (h) of the pier =.?
h = ½gt²
h = ½ × 9.8 × 0.25²
h = 4.9 × 0.0625
h = 0.31 m
The, the height of the pier is 0.31 m
A toy car is tied to a post with string, causing it to drive in a tight circle. This is
shown in the picture below.
In which direction will the toy car go if the string breaks?
Answer:the answer is direction b
Explanation:
If the string breaks, the toy car go on path B. The correct option is D.
What is centrifugal force?The pseudo force which acts when the centripetal force ceases to act on the particle moving in the circular path. While moving, the centripetal force acts towards the center of the circular path.
A toy car is tied to a post with string, causing it to drive in a tight circle. If the string breaks, the toy car is thrown out of the track.
The centrifugal force acts away from the center. But the velocity of motion will be tangential to the circular path. So, when string breaks, the toy car will follow the path B.
Thus, the correct option is D.
Learn more about centrifugal force.
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A boat with an initial speed of 5.0 m/s accelerates at a uniform rate of 1.2
m/s2 for 5.0 s. What is the final speed of the boat during this time? (P.4B)
A. 6.0 m
B. 6.2 m
C. 11 m/s
D. 26 m/s
Answer:
v = 11 m/s
Explanation:
Given tha,
Initial speed, u = 5 m/s
Acceleration, a = 1.2 m/s²
Time, t = 5 s
We need to find the final speed of the boat during this time. Let it is v. Using first equation of motion as follows :
v = u +at
Putting all the values, we get :
v = 5 + 1.2(5)
v = 11 m/s
So, the final speed of the boat is 11 m/s. Hence, the correct option is (c).
The ____ of an earthquake is a measure of its strength.
Please help!
Please help!1!!1111!!1!!!
what are all 7 parts of the eye?
Answer:
The Sclera, Cornea, Iris/Pupil, Lens, Retina, Ciliary Muscle, and Optic Nerve
Diagram:
Answer:
Sclera. The sclera is the white of the eye. ...
The Cornea. The cornea is the clear bulging surface in front of the eye. ...
Anterior & Posterior Chambers. The anterior chamber is between the cornea and the iris. ...
Iris/Pupil. ...
Lens. ...
Vitreous Humor. ...
Retina.
Explanation:
Sclera. The sclera is the white of the eye. ...
The Cornea. The cornea is the clear bulging surface in front of the eye. ...
Anterior & Posterior Chambers. The anterior chamber is between the cornea and the iris. ...
Iris/Pupil. ...
Lens. ...
Vitreous Humor. ...
Retina.
which action will decrease the gravitational force between two objects ?
Answer:
c
Explanation:
moving the mass of each object
Answer:C. Moving the objects farther apart
Explanation:
A 25 kg mass is accelerated by a force at a rate of 5 m/s2. What is the magnitude of the force that accelerates the man?
A 3 kg book is on a shelf 3 m tall. What is its potential energy?
Answer:
88.2J
Explanation:
Given parameters:
Mass of book = 3kg
Height of shelf = 3m
Unknown:
Potential energy = ?
Solution:
The potential energy of a body is the energy due to the position of that body.
It can be mathematically calculated as;
P.E = mgh
m is the mass of the body
g is the acceleration due to gravity = 9.8m/s²
h is the height
Now insert the parameters and solve;
P.E = 3 x 9.8 x 3 = 88.2J
Newton's first law states that objects do not change their motion unless acted upon by a net force. What does the word "net" mean in this context?
A A woven net, such as a fishing net or basketball net
B To catch or ensnare
C Remaining or left over after everything has been accounted for
D To cover, such as with mosquito netting
Answer:
Explanation:
C Remaining or left over after everything has been accounted for.
You can have as many forces as you can define as long as there is an opposing force that cancels it out. If there is just 1 more force that cannot be cancelled, then it is a remaining force and it determines what happens to the object.
The rest have to do with something that resembles a fisherman's net.
Answer:
C
Explanation:
Only reasonable answer.
A rocket initially at rest on the ground lifts off vertically with a constant acceleration of 20m/s^2. How long will it take the rocket to reach an altitude of 16km
16 km = 1/2 (20 m/s²) t ²
t ² = (32 km) / (20 m/s²)
t ² = (32,000 m) / (20 m/s²)
t = √(1600 s²)
t = 40 s
During exercise, the supply of oxygen and __________ to muscles increases. What one word completes the sentence?
Answer:
Glucose
Explanation:
During exercise, muscles need more energy. They get this energy by aerobic respiration, which uses oxygen and glucose to release energy.
Note: If the body fails to supply oxygen to the muscles fast enough, the muscles will produce energy by anaerobic respiration, which is not as effective as aerobic respiration in addition to producing lactic acid.
During exercise, the supply of oxygen and glucose to muscles increases. During exercise, muscles need more energy.
What happens during exercise?They get this energy by high-impact breath, which utilizes oxygen and glucose to deliver energy.
During exercise, your muscles are working diligently. Your breathing and pulse increment, maneuvering more oxygen into the circulation system. As you work out, the oxygen that arrives at your muscles changes over accessible glucose into ATP, furnishing your body with the energy it requires to finish your exercise.
Find more information about Exercise here:
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39
The Dominican Republic has 10.7 million people and a national population growth rate of 1.5 percent. Paraguay
has 6.8 million people and a national population growth rate of 1.5 percent. In how many years will each
country double in size?
47 years
37 years
27 years
57 years
Answer:
The correct answer is - 47 years.
Explanation:
The doubling time of the population growth depends on the rate of population growth. The formula for the calculation of the doubling time is :
time (t) = log(N/N0)/r (time)
here,
N0 (initial population) = The population at time t = 0.
N (future population) = The population at time t.
r (rate) = The rate of population change as a function of t
by the formula
t = log (2/1)/0.015
t = 46.666 years or 47 years approx.
The population of each country will become double in 47 years. hence option (A) is correct.
Given data:
The population of Dominican republic is, n = 10.7 million.
The growth rate of Dominican republic is, p = 1.5 %.
The population of Paraguay is, n' = 6.0 million.
The growth rate of Paraguay is, p' = 1.5 %.
The doubling time of the population growth depends on the rate of population growth. The formula for the calculation of the doubling time is given as,
[tex]t = \dfrac{ln\dfrac{n}{n_{0}}}{p}[/tex]
Here,
[tex]n[/tex] is the final population and [tex]n_{0}[/tex] is the initial population and for doubling the value in future, [tex]n = 2 \times n_{0}[/tex].
Solving as,
[tex]t = \dfrac{ln\dfrac{2\times n_{0}}{n_{0}}}{1.5/100}\\\\t \approx 47 \;\rm years[/tex]
Thus, we can conclude the population of each country will become double in 47 years.
Learn more about the population model here:
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Suppose that two objects attract each other with a gravitational force of 16 units. If the distance between the two objects is reduced in half, then what is the new force of attraction between the two objects?
It would be 8 units becuase half of 16 is 8
Which energy conversion takes place when a solar cell is used to light a street lamp?
A. solar energy → light energy
B. solar energy → electric energy → light and heat energy
C. solar energy → light and heat energy
D. heat energy → light energy
E. heat energy → light energy → electric energy
Answer:
the answer is for the question is B
Is lateral shift or lateral displacement same ?
Answer:
When a ray of light passes through a glass slab of a certain thickness, the ray gets displaced or shifted from the original path. This is called lateral shift/displacement.
Explanation:
.
Near Earth's surface, the acceleration due to gravity is __________ and directed __________.
Answer:
gravity can help us walk
Explanation:
i know cuz we are able to walk
