Answer:
5
Explanation:
A rock is dropped from a garage roof from rest. The roof is 6m from the ground. Determine how long it takes the rock to hit the ground.
Answer:
The rock takes 1.22 seconds to hit the ground
Explanation:
Free Fall Motion
A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.
If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is g = 9.8 m/s^2.
The final velocity of a free-falling object after a time t is given by:
vf=g.t
The distance traveled by a dropped object is:
[tex]\displaystyle y=\frac{gt^2}{2}[/tex]
If we know the height h from which the object was dropped, we can find the time it takes fo hit the ground:
[tex]\displaystyle t=\sqrt{\frac{2y}{g}}[/tex]
[tex]\displaystyle t=\sqrt{\frac{2\cdot 6}{9.8}}[/tex]
[tex]t=1.22\ sec.[/tex]
The rock takes 1.22 seconds to hit the ground
The time taken for the rock to hit the ground from the roof top is 1.1 seconds.
Given the data in the question;
Since the rock was initially at rest
Initial velocity; [tex]u = 0[/tex]Height or distance of roof from the ground; [tex]s = 6m[/tex]Time taken for the rock to hit the ground; [tex]t = \ ?[/tex]
To determine the time taken for the rock to hit the ground, we use the second equation of motion:
[tex]s = u + \frac{1}{2}at^2[/tex]
Where s is the height or distance, u is the initial velocity, t is time taken and a is acceleration due to gravity( since the rock will be under gravity, [tex]a = g = 9.8m/s^2[/tex] )
We substitute our values into the equation
[tex]6m = 0 + [ \frac{1}{2}\ *\ 9.8m/s^2\ * t^2 ]\\\\6m = 4.9m/s^2 \ * t^2\\\\t^2 = \frac{6m}{4.9m/s^2}\\\\t = \sqrt{\frac{6m}{4.9m/s^2}} \\\\t = 1.1s[/tex]
Therefore, time taken for the rock to hit the ground from the roof top is 1.1 seconds.
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What is the smallest unit that makes up matter?
alloys
atoms
chemicals
molecules
Answer:
atoms
Explanation:
.....(✿^‿^).......
Answer:
atom
Explanation:
An atom is the smallest unit of matter that retains all of the chemical properties of an element
1. What are the properties of a compound? Give an example.
Answer:
A compound has unique properties that are distinct from the properties of its elemental constituents. One familiar chemical compound is water, a liquid that is nonflammable and does not support combustion. It is composed of two elements: hydrogen, an extremely flammable gas, and oxygen, a gas that supports combustion.
d. When Alan's puck is moving at 21 m/s south, it collides
with an ice skate of mass 2 kg sitting on the rink. Alan's
puck bounces backward at a speed of 4 m/s. What is the
momentum of the puck-skate system before the collision?
John is riding the bus to the next samuell football game. The bus is traveling to the right at 20 m/s and Jon is walking towards the back (left) of the bus at 5 m/s. What is Jon’s relative velocity to a stationary observer?
Answer:
Vrel_jon's = 15 [m/s] to the right
Explanation:
Relative velocity is defined as the relative motion between two bodies, taking into account the directions of motion.
Relative velocity is defined as the relative motion between two bodies, taking into account the directions of motion. The relative velocity is defined as the algebraic sum of the velocities, if the movements are opposite the vectors are subtracted, as will be done below.
Vrel = 20 - 5 = 15 [m/s]
A person watching Jon sees him moving to the right at a speed of 15 [m/s]
Some parts of this window look brighter than others, even though the same amount of sunlight is striking all parts of the window.
This is happening because some of the light striking the window is
OA. being absorbed.
ОВ.
causing the window to break.
OC. being changed into sound.
OD. being changed into electricity.
Answer:
A
Explanation:
so it looks unequell but it is.
Which particle (proton, neutron, or electron) has a negative charge?
Answer:
electrons
Explanation:
it just does
3. You have a ton of homework to do over the weekend because you were sick during the week. You plan on spending lots of time on Saturday working on your English paper and Science project. On Thursday your best friend calls and invites you to go bowling and to dinner on Saturday. What should you do and Why?
Answer:
No you should not go
Explanation:
Because if you go you will be more behind and then you’ll get so stressed from the work that you didn’t do and then it will just keep on stacking up and get more and more stressed and also another reason is because you should do the responsible choice and stay home and work on your project so you would be telling your friend that you can not go Because you got work to do and maybe you could schedule it for the next weekend and have your fun next week and you should always do the responsible choice.
Explain using Newton's Third Law of Motion, how starting blocks have helped lower times in track events.
Why sound needs medium for propagation? A particle oscillates 40 times in one minute what
will be its time period of oscillations.
plz say me the answer
fast I will mark as brainliest
Answer:
ca taode na kadato itoi runa ko
Answer:
Explanation:
Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
Frequency= no. of oscillations/time=40/60sec
4/6=0.66
An ideal Carnot engine operates between reservoirs having temps of 125 degrees C and -20.0 degrees C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00 degrees C. The heat of fusion of water is 3.34 X 10^5 J/kg and the heat of vaporization of water is 2.25 x 10^6 J/kg. How much work is does this engine do each cycle? How much heat per cycle does this engine absorb at the hot reservoir?
Answer:
Q₁ = 15.78 KJ
W = 5.76 KJ
Explanation:
First we find efficiency of this ideal Carnot engine:
Efficiency = 1 - T₂/T₁
T₁ = source temperature = 125°C + 273 = 398 K
T₂ = Sink Temperature = -20°C + 273 = 253 K
Therefore,
Efficiency = 1 - 253 K/398 K
Efficiency = 0.365 = 36.5%
Now, we find expelled heat (Q₂), by using latent heat of fusion of ice:
Q₂ = mH
where,
m = mass of ice melted = 30 g = 0.03 kg
H = Latent Heat of Fusion of Ice = 3.34 x 10⁵ J/kg
Therefore,
Q₂ = (0.03 kg)(3.34 x 10⁵ J/kg)
Q₂ = 1.002 x 10⁴ J = 10.02 KJ
Now, we use another formula of efficiency to find absorbed heat (Q₁):
Efficiency = 1 - Q₂/Q₁
0.365 = 1 - 10.02 KJ/Q₁
10.02 KJ/Q₁ = 1 - 0.365
Q₁ = 10.02 KJ/0.635
Q₁ = 15.78 KJ
Now, for work done we have the formula:
W = Q₁ - Q₂
W = 15.78 KJ - 10.02 KJ
W = 5.76 KJ
A car accelerates from rest to 27 m/s in 8 seconds. What is the acceleration of the car?
Answer:
The answer is 3.38 m/s²Explanation:
The acceleration of an object given it's velocity and time taken can be found by using the formula
[tex]a = \frac{v}{t} \\ [/tex]
where
a is the acceleration
v is the velocity
t is the time
From the question
v = 27 m/s
t = 8 s
We have
[tex]a = \frac{27}{8} \\ = 3.375[/tex]
We have the final answer as
3.38 m/s²Hope this helps you
9. You are heating a piece of glass and now want to pick it up, You should
a. Use a rag or paper towels
b. Pick up the end that looks cooler
c. Use tongs
d. Pour cold water on it
Answer:
c. use tongs
Explanation:
The properties of a rectangular prism are listed below:
Density = 120 g/cm with an exponent of 3
Length = 4 cm
Width = 2 cm
Height = 1 cm
What is the mass of the rectangular prism?
a
15 g
b
45 g
c
960 g
d
980 g
WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!TO THE FIRST PERSON WHO ANSWERS!!!!!!!!!!!!!!!!!!!!!
Answer:
B. 45 g because it is the given answer of the division that is given to the equation
value of mass of a body is fixed everywhere. true or false
Answer:
Mass of a body is fixed everywhere. True
Explanation:
What is mass ?Mass is the amount of matter of a body. it is a fundamental quantity. It is a dimensionless quantity.is dimensional symbol is [M].Since amount of a matter is not dependent of place or position therefore it remains same at everywhere.
Hence value of mass of a body is fixed everywhere.
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Two double bonds means that the total number of electrons being shared in the molecule is
One double bond consists 4 electrons, so 2 double bonds means 8 electrons
Answer: 8 electrons
Explanation:edg
The south pole of a magnet is brought near to a solenoid, which is connected to an ammeter. As the magnet is moved towards and away from the point P, the ammeter shows deflection. What magnetic pole is produced at P when the south pole of the magnet is brought towards and away from the solenoid.
Answer:
This question appears incomplete
Explanation:
However, this question seeks to seek our knowledge of Lenz law which states that the current produced by an induced emf (electromotive force) moves/flows in the direction opposite to the change in flux that induced the emf.
From this law, it can be noted from the question that the magnetic pole produced (at P), when the south pole of the magnet is brought towards the solenoid, is the south pole while the magnetic pole produced (at P), when the south pole of the magnet is taken away/changed from the solenoid, is the north pole.
It should be noted that solenoid is an electromagnetic device (and can hence be used to induce emf) that can convert electrical energy to mechanical energy.
Which Type of relationship is this ?
Answer:
Indirect relationship
PLEASE HELPPPPPP!! 25 POINTS!!
Arnold ran the 100-meter dash in 24 seconds. Using the speed formula, calculate Arnold’s average speed.
Emma ran the 100 meter dash in 11 seconds. Using the speed formula, calculate Emma’s average speed.
Who was the fastest runner?
What was the winner's average speed?
Select the 2 best answers.
a. Arnold
b. Emma
c. The winner's average speed was 4.2 m/s
d. The winner's average speed was 9.1 m/s
e. The winner's average speed was 0.11 m/s
f. The winner's average speed was 100 m/s
What is the velocity of a freely falling object 10 seconds after it is released from rest?
Answer:
around 98 meters per second.
Explanation:
Instantaneous velocity can be found with a equation.
Vf=Vi+At
Since it fell and had no initial velocity the equation becomes
Vf=At
The Acceleration is 9.8 m/s^2
So the velocity of it fell for ten seconds is
Vf=9.8m/s^2 * 10
Vf= 98 m/s
How much will be the net displacement if a car travels 6 km east and then travels 14 km west
4 points
please helpp meee write the analysis and then answer the next pic
Please help! I have no idea what to do.
Jack weighs 159 pounds on Earth. What is his mass, in kg? Show your work.
Thank you!
An Inuit pushes a loaded dogsled with a mass of 600.0 kg over the frictionless surface of hard-packed snow. He exerts a constant 150.0 N force as he does so.
What is the sled's acceleration?
Given parameters:
Mass of Dogsled = 600kg
Force = 150N
Unknown:
Acceleration of the sled = ?
Solution:
Force is a physical quantity and can be expressed as a product of mass and acceleration.
Force = mass x acceleration
Since acceleration is unknown, we input the parameters and solve for it;
150 = 600 x acceleration
Acceleration = [tex]\frac{150}{600}[/tex] = 0.25m/s²
The acceleration of the sled is 0.25m/s²
Representation in the House is based on
A. equality between states
B. a state's population
Answer:
state population
Explanation:
bestie you can find it on Constitution on article l
If ice didn't float, but sank instead, this change wouldn't affect aquatic life. true of false
Answer:
No it will not (false)
Explanation:
I say this because if anything the ice will sink and melt from a solid to a liquid and that will lead to i guess more water for the aquatic life. (THIS IS A THEORY SHAWTY)
derive mean in science
Explanation:
derive its name from a Native American word meaning wild onion
Jonathan connected a bulb of unknown resistance to a 3.7 V battery and measured a current of 1.23 A flowing through the bulb.
What current flowing through the bulb can Jonathan claim for his second electric circuit?
A
0.60 amps
B
1.66 amps
C
15.00 amps
D
15.15 amps
Answer:
d
Explanation:
15.15 amps lowing through the bulb can Jonathan claim for his second electric circuit
What is a circuit ?Electronic components like resistors, circuitry, capacitors, inductors, and diodes are connected by conductive cables or traces that allow electric current to flow between them.
It is a specific kind of electrical circuit, and it is called as electronic rather than electrical, there usually needs to be at least each active component present.
In this circuit Signals can be amplified, calculations can be made, and data can be transported from one location to another thanks to the combination of factors and wires.
Electric current is generated by a power source like battery, and can travel through conductors such as wires, before returning to the power source. Electric circuits can be divided into two types: series and parallel circuits.
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What are three key aerodynamics principles?
A Drag, height, and acceleration
B Drag, downforce, and drafting
C Acceleration, downforce, and motion D Acceleration, height, and motion
Answer:
A
Explanation:
There are three basic forces in aerodynamics: acceleration, which moves an airplane forward; drag, which holds it back; and height, which keeps it airborne. Lift is generally explained by three theories: Bernoulli's principle, the Coanda effect, and Newton's third law of motion.
A dog walks 21 m north and then walks 35 m west to bury a bone. What is the displacement of the dog?
Answer:
40.8 m North West.
Explanation:
Please see attached photo for diagram.
In the attached photo, R represent the displacement of the dog.
The displacement (R) of the dog can obtained by using the pythagoras theory as illustrated below:
R² = 35² + 21²
R² = 1225 + 441
R² = 1666
Take the square root of both side.
R = √1666
R = 40.8 m North West.
Therefore, the displacement of the dog is 40.8 m North West.