Answer:
They both hit the ground at the same time.
Explanation:
if you drop a 100 g and 200 g mass simultaneously from the same height they’ll hit the ground at the same time.
Yes, there is a role of a very simple equation of kinematics i.e.
s=ut+1/2(at^2)
so, s means the height is the same for both masses(h), u(initial velocity) is obviously zero cause you are dropping it, a (acceleration) is due to the gravity here only ‘g’.
time is taken for a particular object to hit the ground,
t= (2h/g)^1/2 .
We can see that there is no term for the mass of objects, meanwhile, the mass of the object has nothing to do with the time taken in hitting the ground in this case.
When explaining chemical reactions to a friend, Brianna models a reaction by taking several colors of modeling clay and making a sculpture of a horse. Which type of chemical reaction is Brianna most likely explaining? synthesis decomposition polymerization replacement
Answer: synthesis
Explanation:
Chemical reaction which Brianna is explaining is synthesis reaction as she is making use of various colors to make a sculpture of horse .
What is chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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What kind of energy do electric and magnetic fields contain?
A
thermal energy
B
electrical energy
C
kinetic energy
D
pot
Answer:
Electromagnetic waves
Electromagnetic waves bring energy into a system by virtue of their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave itself, whether it is absorbed or not.
So the answer is B electrical energy
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what's the answers for all of the questions ?///
what are the two poles of a magnet
Answer:
The end that faces the north is called the north-seeking pole, or north pole, of the magnet. The other end is called the south pole. When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges.
Explanation:
Answer:
North pole, south pole
Explanation:
The end of the pole that faces the north is the north pole, and the other end is called the south pole.
Opposite poles attract (North-South), but like poles repel (South-South, North-South).
Suppose the spark plug on a heat engine is not functioning properly which statement best explains how this will affect the engine?
Answer:
B. Burned gas...
Explanation:
The statement explains the importance of enzymes that check for and repair mistakes during DNA replication is the enzymes prevent many genetic mutations from being expressed.
What is RNA polymerase?RNA polymerase is an enzyme that aids in the transcription of DNA into RNA during transcript in the nucleus. The enzymes prevent many genetic mutations from being expressed.
Primase is an enzyme that synthesizes short RNA sequences called primers. These primers serve as a starting point for DNA synthesis during replication as the DNA polymerases cannot begin the synthesis of the new strand, they only extend it after primase begins it and primase produces RNA molecules, the enzyme can be said to be a type of RNA polymerase.
Therefore, The statement explains the importance of enzymes that check for and repair mistakes during DNA replication is the enzymes prevent many genetic mutations from being expressed.
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Which statement did Kepler’s investigations of the movement of the planets explain?
Jupiter has more moons than earth.
Gravity acts on all objects in the universe.
The sun is more massive than earth.
Earth is not the center of the universe.
Answer:
earth is not the center of the universe
Explanation:
i just took the test
Kepler's laws allow us to find that the correct answer, the basis is these is
d) Earth is not the center of the universe.
Kepler made extensive measurements and created a mathematical model of the movement of the planets around the sun, these analyzes are written in the form of three laws
Kepler's first law. Says the planets move elliptically Kepler's second law. Establish that the vector from the sun to the planet sweeps equal area in equal time intervals Kepler's third law. It is an application of Newton's second law to the movement of the planets around the sun, it gives a relationship between the period of the orbit and the semi-major axis of the ellipse.
[tex]T^2 = ( \frac{4\pi ^2}{G M_s} ) \ a^3[/tex]
Where T is the period, a the major axis, G the universal gravitational constant and [tex]M_s[/tex] the most of the sun.
When analyzing these Kepler's laws in all the sun is the center of movement.
Let's analyze the different claims;
a) False. The laws are not on a specific planet
b) False. Gravity is not in Kepler's laws
c) False. A ratio of the masses between planets and the sun is not established
d) True. In the laws the sun is the center of movement, therefore the earth is not the center of the universe.
In conclusion using Kepler's laws we can find that the correct answer for the bases of these is:
d) Earth is not the center of the universe.
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A coin falling through a vacuum loses no energy to friction, and yet after it hits the ground it has lost all its potential and kinetic energy. Which statement best explains why the law of conservation of energy is still valid in this case
Answer:
Explanation:
When coin is at a height and rest, it only has potential energy( by the virtue of its position). While the coin is falling its potential energy changes into kinetic energy. This means that its potential energy is decreasing and kinetic energy increases. just before its hits the ground kinetic energy is maximum and potential energy becomes zero.
When it hits the ground all its kinetic energy is converted into heat.
what sphere on earth includes mountains
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A car is traveling 60 km/h and accelerates at a rate of 4 m/s^2 how long does it take the car to get to 90 km/h? ( please show work)
Answer:
Vf = 90km/h
(90*1000)/3600 ==>
(90*10)36
Vf = 25m/s
, Vi = 60km/h
(60*1000)/3600
16.666m/s =>16.7m/s
, a = 4m/s^2
t = ?
Explanation:
Vf = Vi + at
25m/s = 16.7m/s +4m/s^2(t)
25m/s - 16.7m/s = 4m/s^2(t)
8.3m/s = 4m/s^2(t)
8.3m/s/4m/s^2 = t
2.075s = t => 2.1s
The mass of an object is 60kg on the surface of the earth what will be its weight on the surface of the moon
Take g as 10m/s2
Answer:
Wm = 97.2 [N]
Explanation:
We must make it clear that mass and weight are two different terms, the mass is always preserved that is to say this will never vary regardless of the location of the object. While weight is defined as the product of mass by gravitational acceleration.
W = m*g
where:
m = mass = 60 [kg]
g = gravity acceleration = 10 [m/s²]
But in order to calculate the weight of the body on the moon, we must know the gravitational acceleration of the moon. Performing a search of this value on the internet, we find that the moon's gravity is.
gm = 1.62 [m/s²]
Wm = 60*1.62
Wm = 97.2 [N]
Disregarding air friction, what force(s) act on a bullet shot from a rifle as it moves through the air?
a) gravity
b) spinning force from the rifle
c) force from the gunpowder
d) none of the above
Answer:
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the answer is a.
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Explanation:
What is the mass of an object that requires 45N to pull and accelerate at 0.5m/s2?
Answer:
t think 90
Explanation:
m=f/a
=45kg m/s/0.5m/s
450kg/5
90kg
Correct displacement 4km south,2 km north, 5km south, and 5 km north
Answer:
2 km due south.
Explanation:
We need to find the displacement of 4km south,2 km north, 5km south, and 5 km north.
Let south is negative direction and north is positive direction.
The shortest path covered by an object is called its displacement.
D = -4+2-5+5
D = -2 km
So, the displacement is 2 km and it is in south direction.
6. The momentum of a 30.0 g bird with a speed of 12 m.s-1 is 0.36 kg.m.s-1. What will be its momentum 12s later if a constant .02 N force due to air resistance acts on it
Answer:
Explanation:
initial momentum = .36 kg.m.s⁻¹
negative impulse = force x time = .02 x 12 = .24 kg.m.s⁻¹
final momentum - initial momentum = impulse
final momentum = initial momentum + impulse
= .36 - .24
= .12 kg.m.s⁻¹
If you have a fragment of glass that weighs 5 grams and has a volume of 2.4
g/ml, what is the density?
A)12 g/mL.
B)7.4 ml/g
C)2.08 g/ml
D)0.48 ml/g
Answer:
C)2.08 g/ml
Explanation:
density = [tex]\frac{mass}{vloume\\}[/tex]
=[tex]\frac{5}{2.4}[/tex]
=2.08g/ml
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Answer:
A. 1.
B. 5.
C. 3.
D. 4.
E. 6.
F. 4.
Explanation:
what is the formula to calculate net force
Answer:
If N is the number of forces acting on a body, the net force formula is given by, FNet = F1 + F2 + F3
Explanation:
Use the drop-down menus to complete each statement.
In the mitochondria small molecules combine with to produce and carbon dioxide.
This process releases a large amount of .
Answer:
oxygen, water , energy
Explanation:
i took the instruction where this is from
Answer:
oxygen/water/energy
Explanation:
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what is mass? what is mass ?
Answer:
Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. ... It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body, the smaller the change produced by an applied force.
Explanation:
AnsA
Explanation:
The amount of matter in an object
1. A wave has a wavelength of 5 m and a frequency of 2 Hz. At what speed/velocity does the
wave travel?
2. The speed/velocity of a wave on a guitar string is 100m/s and the frequency is 1,000 Hz. What
is the wavelength of the wave?
3. If the speed/velocity of a wave is 25 m/s and the wavelength is 5 m, what is the frequency of
this wave?
Answer:
1.10m/s
2.0.1m
3.5Hz
Explanation:
v=velocity, f=frequency and T=wavelength
1.v=ft
v=2x5
=10m
2.v=ft
100=1000T
divide both sides by 1000
T=0.1m
3.v=fT
25=5f
divide both sides by 5
f=5Hz
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A circuit contains a 305 ohm resistor, a 1.1 micro Farad capacitor, and a 42 mH inductor. At resonance, the impedance is determined to be 336.4 ohms. What is the resistance of the inductor?
Answer:
The resistance of the inductor at resonance is 258.76 ohms.
Explanation:
Given;
resistance of the resistor, R = 305 ohm
capacitance of the capacitor, C = 1.1 μF = 1.1 x 10⁻⁶ F
inductance of the inductor, L = 42 mH = 42 x 10⁻³ H = 0.042 H
At resonance the inductive reactance is equal to capacitive reactance.
[tex]\omega L = \frac{1}{\omega C}\\\\2\pi F_0 L = \frac{1}{2\pi F_0 C}\\\\F_0 = \frac{1}{2\pi\sqrt{LC} }[/tex]
Where;
F₀ is the resonance frequency
[tex]F_0 = \frac{1}{2\pi\sqrt{LC} } \\\\F_0 = \frac{1}{2\pi\sqrt{(0.024)(1.1*10^{-6})} }\\\\F_0 =980.4 \ Hz[/tex]
The inductive reactance is given by;
[tex]X_l = 2\pi F_0 L\\\\X_l = 2\pi (980.4)(0.042) \\\\X_l = 258.76 \ ohms[/tex]
Therefore, the resistance of the inductor at resonance is 258.76 ohms.
A truck with the mass of 8 ton travels at a velocity of 60km/h and collides
with a truck with a mass of 5 tons travelling in the same direction at 40km/h.
After the collision the two trucks move together.
Calculate the final common velocity if the TWO trucks in m/s after the
collision?
Answer:
52 km/h
Explanation:
When the two trucks move together after collision, the momentum of the system is conserved. The kinetic energy is not conserved. This is inelastic collision
The formula to apply here is :
m₁v₁ + m₂v₂ = {m₁+ m₂} *vf
Given that ;
m₁ = 8 ton ----convert to kg [ multiply by 907.185] =7258 kg
v₁ = 60 km/h
m₂ = 5 tons ------4536 kg
v₂ = 40 km/h
vf = final velocity
Using the values given;
m₁v₁ + m₂v₂ = {m₁+ m₂} *vf
8*60 + 5*40 = {8+5} * vf
480 + 200 = 13 * vf
680 = 13vf
680/13 = vf
52 km/h = vf
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Answer:
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Explanation:
A ball is thrown directly downward at 4 m/s from the edge of a high cliff. If needed, use g = 10 m/s2. With zero air resistance, the distance the ball falls during its third second of fall is most nearly
28 m
4 m
29 m
12 m
57 m
Answer:
57 meters
Explanation:
Let's see what variables we have in this problem:
[tex]v_i \ \ \ \ \ \ \ t \\ v_f \ \ \ \ \ \ \triangle x \\ a[/tex]Let's set the upwards direction to be positive and the downwards direction to be negative.
We are given the initial velocity, 4 m/s. Since the ball is thrown directly downward, we can say that the initial velocity = -4 m/s.
We are also given the acceleration due to gravity, and since the acceleration is pointing downwards, we can say that a = -10 m/s².
The time is also given to us; the question wants to know the vertical displacement at time = 3 seconds, so we can plug in 3 seconds for t.
Since we are solving for vertical displacement, we can use [tex]\triangle x[/tex] as one of our variables.
Now we have all of the variables except for the final velocity, [tex]v_f[/tex].
Since we are dealing with constant acceleration, we can use this constant acceleration equation:
[tex]x_f=x_i+v_it+\frac{1}{2}at^2[/tex]Subtract [tex]x_i[/tex] from both sides to get [tex]\triangle x[/tex].
[tex]\triangle x =v_it+\frac{1}{2}at^2[/tex]Substitute in the known values:
[tex]\triangle x = (-4\frac{m}{s})(3s) + \frac{1}{2}(-10\frac{m}{s^2})(3s)^2[/tex]Get rid of the units to make the equation more readable.
[tex]\triangle x = (-4)(3) + \frac{1}{2} (-10)(3)^2[/tex]Simplify the equation and solve for delta x.
[tex]\triangle x=(-12) -5(9)[/tex] [tex]\triangle x =-12-45[/tex] [tex]\triangle x = -57[/tex]The vertical displacement is -57 meters, so we can say that the distance the ball falls in 3 seconds is most nearly 57 meters.
Should we use less energy because it is
harming the planet?
Answer:
Yes - si.
Explanation:
Answer:
yes we should use less energy
If a pendulum makes 10 oscillations in 5 seconds, what is its oscillation frequency?
Answer:
[tex] \boxed{ \rm{Frequency = 2 hertz}}[/tex]
Explanation:
We know that,
"Frequency refers to the number of occurrences of a periodic event per time and is measured in cycles/second."
According to Question,
⇒ 5 seconds = 10 oscillations
⇒ 1 second = 10/5 oscillations
⇒ 1 second = 2 oscillations
In one second, there are 2 oscillations or cycles. The unit of frequency is Hertz. Hence, the frequency is 2 Hertz.
24. Which of the following is true for a generator?
A. It transforms thermal energy to electrical energy.
B. It transforms mechanical energy into electrical energy.
C. It transforms electrical energy into mechanical energy.
D. It transforms solar energy into electrical energy.
Answer:
The answer is b: mechanical to electrical
The trunk of a elephant may extend up to 2.2 m. It acts much like an organ pipe only open at one end when the elephant blows air through it. 1) Calculate the fundamental frequency of the sound the elephant can create with its trunk.2) If the elephant blows even harder, the next harmonic may be sounded. What is the frequency of the first overtone?
Answer:
1) f = 38.63 Hz , 2) f = 115.9 Hz
Explanation:
The elephant's trunk can be approximated by a tube with a closed end, in pipes the closed ends correspond to nodes and the open ends to antinodes or bellies.
The expression for the wavelengths of this system is
4L = n λ
n = 1, 3, 5, 7 ...
also let's use the relationship between frequency and wavelength and wave speed
v = λ f
f = v / λ
f = v n / 4L
f = v / 4L n
1) the fundamental frequency occurs for n = 1
f = 340/4 2.2 1
f = 38.63 Hz
2) The first harmonic
n = 3
f = 340/4 2.2 3
f = 115.9 Hz