Answer:
Explanation:
first get the velocity value in km/h
140/2=70km/h
to change the value (kilometers per hour) to meters per second divide by 3.6
70/3.6=19.44m/s
Which one of the following is not a balanced equation
Answer:
B
Explanation:
just did the test
A skydiver falls out of a plane from rest, and experiences no air resistance. Eventually, this skydiver reaches a velocity of 33 m/s. How much time did this take? *
Answer:
the time taken for the motion is 3.37 s
Explanation:
Given;
initial velocity of the skydiver, u = 0
final velocity of the skydiver, v = 33 m/s
The time taken for the motion is calculated as;
v = u + gt
33 = 0 + 9.8t
33 = 9.8t
t = 33 / 9.8
t = 3.37 s
Therefore, the time taken for the motion is 3.37 s
A spring is pulled to 10 cm and held in place with a force of 500 N. What is the spring constant of the spring in N/cm?
Answer:
K=50N/cm
Explanation:
Force can be calculated using below expresion;
F=ke
where f = force,
k =spring constant,
e = extension
force = 500 N
e= 10 cm =
Then substitute, the given values
500=10 × k
k=500/10
K=50N/cm
A force of 200N was required to pull the arrow back 0.25m in the bow. If the archer were to release the bowstring how much energy would the arrow gain?
Answer:
50 Joules
Explanation:
Work (J) = Force (N) x Distance (m)
Work (J) = 200 N x 0.25 m
Work = 50 Joules
Work is converted to kinetic energy when the arrow is released.
Which of the following statements describes the electric force between a positive particle and a negative particle as they approach each other?
Answer:
They will Attract each other and act like magnets
Explanation:
When 2 positive or 2 negative particles are near each other they repel. When 2 neutral particles are together they do nothing, but when a positive and a negative are together their charges sort of overlap each other and they attract.
Which of these is the name for the force that acts against moving objects? A. Inertia b. Friction c. Acceleration d. Brakes
Answer:
B. Friction
Explanation:
The mass of an object is 0.201 kg. The object requires 15.0 J of heat to
raise its temperature by 283 K. What is the specific heat of the object? *
Answer:
49k
Explanation:
yes you can go with me
Which muscles help you sit up from laying down?
Answer: abdominal muscles.
Explanation:
Question 1 of 10
How much thermal energy is needed to melt 1.25 kg of water at its melting
point?
Use Q = mass x latent heat of fusion.
Properties of water
Property
Value
Melting point
0°C
Boiling point
100°C
Cliquid
4.18 kJ/(kg.°c)
Latent heat of fusion
333 kJ/kg
Latent heat of vaporization
2260 kJ/kg
The thermal energy needed to melt 1.25 kg of water at its melting point is 416.25 kJ.
What is the latent heat of fusion?The latent heat of fusion is the amount of thermal energy required to change the phase of a substance from a solid to a liquid state without a change in temperature.
When a substance is in a solid state, the molecules are packed closely together and are held in a rigid structure by intermolecular forces. As heat is added to the solid, the temperature of the substance increases until it reaches the melting point, which is the temperature at which the solid starts to change into a liquid.
At the melting point, the added thermal energy is used to break the intermolecular bonds that hold the molecules in the solid structure. The energy absorbed during this process causes the molecules to become less ordered and to move more freely, resulting in a liquid state. However, during the melting process, the temperature of the substance remains constant until all of the solid has melted.
The latent heat of fusion is a property of the substance and is defined as the amount of energy required per unit mass to change the phase from solid to liquid. It is usually measured in units of joules per kilogram (J/kg) or kilojoules per kilogram (kJ/kg).
The latent heat of fusion is an important concept in thermodynamics and is used in many applications, such as the melting of ice, the solidification of molten metals, and the formation of igneous rocks.
Here in the Question,
To calculate the thermal energy needed to melt 1.25 kg of water at its melting point, we can use the formula:
Q = mass x latent heat of fusion
where Q is the thermal energy required, and the latent heat of fusion is the amount of energy required to change the phase of a substance from solid to liquid without changing its temperature.
Substituting the given values, we get:
Q = 1.25 kg x 333 kJ/kg
Q = 416.25 kJ
Therefore, 1.25 kilogram of water requires 416.25 kJ of thermal energy to melt at its melting point.
To learn more about specific heat click:
brainly.com/question/31608647
#SPJ7
How many valence electrons does galiem have?
A. 3
B. 13
C. 31
D. 2
a clay ball with a mass of 0.35 kg hits another 0.35 kg ball at rest and the two stick together. The first balls intial speed us 4.2m/s.
What are the balls final speed?
Answer:
4.2 m/s
the balls final speed is V (m/s)
because the clay ball hits another and the two stick together
=> 0,35.4,2 + 0,35.4,2 = (0,35 + 0,35).V
<=> 2,94 = 0,7V
<=> V = 2,94/0,7 = 4,2
For a clay ball with a mass of 0.35 kg, the ball's final speed is mathematically given as
V2= 4.2
What is the balls final speed?Question Parameter(s):
A clay ball with a mass of 0.35 kg
Hits another 0.35 kg ball at rest and the two stick together.
The first ball's initial speed is 4.2m/s.
Generally, the equation for the conservation of momentum is mathematically given as
M1v1=m2v2
Therefore
0.35*4.2 + 0.3*5.4.2 = (0.35 + 0.35)*V
2,94 = 0,.7V
V2 = 2.94/0.7
V2 = 4.2
In conclusion
V2= 4.2
Read more about Speed
https://brainly.com/question/4931057
#SPJ2
Which type of information about rattlesnakes does the bar graph above show?
Answer:
Variation
Explanation:
define principle of lever
Answer:
pull to activate something
Explanation:
Which statement best describes what occurs when a warm front occurs?
A)Snow showers occur, followed by colder weather.
B)The weather doesn't change.
C)Rain and showers occur, followed by warmer weather.
D)Cloudy, cold weather occurs.
Which statement is true of an electromagnetic wave?
A. The wave needs particles in matter as a medium.
B. The wave travels through electric and magnetic fields.
C. The wave is caused by vibrating particles of matter.
D. The wave carries mechanical energy.
Answer:
C
Explanation:
Electromagnetic waves are produced by the vibration of charged particles.
The true statement of an electromagnetic wave is option c. The wave is caused by vibrating particles of matter.
What is an electromagnetic wave?It is the wave that should be developed that leads to the vibration that lies between the electric field and a magnetic field.
Here EM waves should be composed for oscillating magnetic and electric fields.
Hence, the option c is correct.
Learn more about wave here: https://brainly.com/question/19053849
(6) Determine the pressure due to water at the bottom of a tank which is 25cm deep and is four-fifths full of water. (Density of water = 1000kg/m^2)
Answer:
it should be be 40 hope this helps
6. The transfer of thermal energy by radiation does not require matter.
O True
O False
Answer:false
Explanation:
If I am walking towards the rising sun and turns left, on which side will my shadow be? PLEASE ANSWER BY 11.20 AT 8TH FEB 2020....
Answer:
The shadow would be on your left side.
Explanation:Give brainliest if this helped :)
Why does the Moon appear red during a lunar eclipse?
1.)Because the sunlight bends as it passes through the Earth's atmosphere
2.)Because the sunlight bends as it passes through the Moon's atmosphere
Answer:
Image result for Why does the Moon appear red during a lunar eclipse?
A lunar eclipse takes place when the sun, Earth and moon line up in space. The moon passes through Earth's shadow. ... Bottom line: The moon can look red during a total lunar eclipse because of sunlight that's filtered and refracted by Earth's atmosphere
Which of the following statements is false?
Dissolving salt into water is an example of a mixture.
The mass of one piece of paper is the same even after it is ripped in half and the 2 pieces are measured again.
Increasing the temperature of water to a boil is a physical change.
The formation of a precipitate is the only way to see if a chemical change has occurred.
A spring with a spring constant of 100 N/m is stretched 0.2 m. How much energy is stored in this spring?
Answer:
20
Explanation:
[tex]100 \times 0.2 = 20[/tex]
Answer:
1.96 kg * m2/s2
Explanation:
An eagle with a mass of 20 kg flies 500 m above the ground. What is its GPE?
A. 500,000 J
B. 100,000 J
C. 1,000,000 J
D. 10,000 J
Move the slider on the battery to give it some voltage. What do the particles moving through the coil of wire represent?
It represents electrons. The moving electrons show current passing through the wire
PLS ANSWER FAST WILL GIVE BRAINLY!!!!
Why does the look of an atom keep changing?
Answer:Atomic model keep changing because the electrons around the nucleus are not fixed and they keeps rotating or changing their position in valence orbits around the nucleus.
Explanation:
Please answer quick! Thanks guys!
Answer:
wire By please mark my answer in brain list
Answer:
Remove wire G, if the wire after it is F. Remove wire A as C is connecting to it already.
Divide. Write the quotient in lowest terms.
3\dfrac{3}{8} \div 9 =3
8
3
÷9
Answer:
39
Explanation:
calculator
Answer:
39 is the answer. of your questions
Help me please
There’s 2 questions.
Answer:
50 Joules of work on the system Total distance is 1m W= F ×D 50 Joules = F × 1m F= 50 Newtons W= 1234 J D= 451234= F × 45 meters F= 27.42 Newtons I do exams and quizzes if ur interestedPLEASE HELP!! 25 POINTS!! WILL MARK BRAINLIEST!!
The focus of a parabola is (−6,−3) . The directrix of the parabola is y=4. What is the equation of the parabola?
The focus of a parabola is (0,−4). The directrix of the parabola is the line y=−5. What is the equation of the parabola?
The directrix of a parabola is the line y=7. The focus of the parabola is (2,3). What is the equation of the parabola?
The directrix of a parabola is y=−6. The focus of the parabola is (−2,−4) . What is the equation of the parabola?
The standard equations of the parabolas are listed below:
y + 6 = - (1/14) · (x + 6)² y = (1/2) · (x + 4.5)² y - 5 = - (1/8) · (x - 2)² y + 5 = (1/4) · (x + 2)²How to determine the standard equation of the parabolaIn this question we have four case of parabolas with vertical axes of reference, whose standard formula is:
[tex]y - k = \frac{1}{4\cdot p}\cdot (x-h)^{2}[/tex] (1)
Where:
(h, k) - The vertex of the parabola.p - Least distance between the vertex and the focus of the parabola.Please notice that p < 0 when the directrix is above the focus, otherwise p < 0. The vertex is the midpoint of line segment between the directrix and the focus.
Now we proceed to derive the standard equations of the parabola:
1) Vertex:
(h, k) = 0.5 · (- 6, 4) + 0.5 · (- 6, - 3)
(h, k) = (- 6, 0.5)
Least distance:
p = - 3.5
y + 6 = - (1/14) · (x + 6)²
2) Vertex:
(h, k) = 0.5 · (0, - 4) + 0.5 · (0, - 5)
(h, k) = (0, - 4.5)
Least distance:
p = 0.5
y = (1/2) · (x + 4.5)²
3) Vertex:
(h, k) = 0.5 · (2, 3) + 0.5 · (2, 7)
(h, k) = (2, 5)
Least distance:
p = 2
y - 5 = - (1/8) · (x - 2)²
4) Vertex:
(h, k) = 0.5 · (- 2, - 6) + 0.5 · (- 2, - 4)
(h, k) = (- 2, - 5)
Least distance:
p = 1
y + 5 = (1/4) · (x + 2)²
To learn more on parabolas: https://brainly.com/question/4074088
#SPJ1
PLS ANSWER FAST WILL GIVE BRAINLY!!!
how do scientist measure mass of an atom?
Distance and direction of an object's change in position from a starting point are:
Answer:
An object changes position if it moves relative to a reference point. The change in position is determined by the distance and direction of an object's change in position from the starting point (displacement). Direction • Direction is the line, or path along which something is moving, pointing, or aiming.
Explanation:
Answer: An object changes position if it moves relative to a reference point. The change in position is determined by the distance and direction of an object's change in position from the starting point (displacement). Direction • Direction is the line, or path along which something is moving, pointing, or aiming.
Explanation: BRAINLIEST?