Answer:
a) y = 16.51 [m]
b) t = 1.83 [s]
Explanation:
To solve this problem we must use two kinematics equations, the first to determine the height to which the ball reaches, and the second equation to determine how long it lasts in the air.
[tex]v_{f} ^{2}= v_{i} ^{2} - (2*g*t)\\[/tex]
where:
Vf = final velocity = 0
Vi = initial velocity = 18 [m/s]
g = gravity acceleration = 9.81[m/s^2]
t = time [s]
Note: the negative sign of the Equation indicates that the acceleration of gravity acts in the opposite direction to the movement of the ball. The final velocity is zero, since the ball reaches its maximum altitude when the velocity is zero.
Now replacing:
0 = (18)^2 - (2*9.81*y)
y = 16.51 [m]
b)
[tex]v_{f} = v_{i} - (g*t)[/tex]
0 = 18 - (9.81*t)
t = 1.83 [s]
Define Fundamental unit and Derived Unit
What is the weight of a 4.5 kg mass on Earth?
Answer:
7.535×10^25 earth mass
Explanation:
for an approximate result,divide the mass value by 9.223e+18
To study the dependant variable, a scientist must A. manipulate the independent variable B. have more than one control group C. manipulate the dependent variable D. have more than one experimental group
Answer:
A
Explanation:
Answer:
A. manipulate the independent variable
You are driving a car and are at a stop light. When the light turns green, you
step on the gas and accelerate at 6.Omi/hr2. Your final speed is 60 miles per
hour (mi/hr or mph). How much time did it take you to get to your final speed?
Answer:
t= 10 hr
Explanation:
v(final)=v(initial)+at
60 mi/hr= 0 mi/hr+ (6 mi/hr2)t
(60 mi/hr)/(6 mi/hr2)=t
t= 10 hr
A car is moving at 18 m/s when it accelerates at 8 m/s2 for 2 sec. What is his new velocity ?
1 a rectangular block of steel measures 4cm * 2cm* 1.5cm. its mass is 93 .6g
a) calculate the density of steel
b)steel is made up of almost entirely of atoms butt is denser than iron
suggest a reason for this
a) density = 93.6g/12cm³
= 7.8g/cm³
b) The reason is alloying
Explanation:
volume of the rectangular block = l× b × h
= (4 × 2 × 1.5)cm
= 12 cm³
density = mass/ volume
mass = 93.6g
volume = 12cm³
therefore,
density = 93.6g/12cm³
= 7.8g/cm³
b) °Steel is formed when alloying Iron with carbon.
°Alloying improves the physical properties of the metals and non-metals
What is the name of the convection
current in the atmosphere that cycles
between the equator and 30° N and
30° S?
Answer:
Hadley cells
Explanation:
Formation of Convection Currents
Atmospheric convection currents are global patterns of air movement that are initiated by the unequal heating of Earth. Hadley cells- the convection currents that cycle between the equator and 30˚ north and south.
For every ______
there is an equal and opposite ______.
a. interaction & action b. action & reaction
c. action & interaction
It's Action and Reaction
what is the average velocity of a car that travels 30 kilometers due west in 0.50 hour
The average velocity of a car that travels 30 kilometers due west in 0.50 hour - 60 km/hour west.
Average velocity is the displacement of an object with the time change. To find the average speed of an object we divide the distance travelled by the time elapsed.
Velocity is a vector quantity and average velocity can be found by dividing displacement by time.Average velocity is defined as the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occursAverage velocity = ∆x/∆t
Then,
average velocity = 30/0.5
= 300/5
= 60
Thus, the correct answer would be - 60 km/hour west.
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What makes an electric charge?
Answer:
Most electric charge is carried by the electrons and protons within an atom. Conversely, two protons repel each other, as do two electrons. Advertisement. Protons and electrons create electric fields, which exert a force called the Coulomb force, which radiates outward in all directions.
HELP PLEASE!
write the equation for calculating relative velocity in one dimensional.
Anwer:
Key Equations
Position Vector: `n r (t) = (t)^j+y
Total acceleration: `n a = `n aC
+ `n aT
Position Vector in frame S is the position Vector in frame S` plus the vector from the origin of S to the origin of S`: `n rPS = `n rPS`
+ `n rS`S
Relative velocity equation connecting two references frame: `n vPS = `n vPS`
+ `n vS`S
Help Plsss
Which of the following objects are subject to the law of universal gravitation? (circle all that apply)
a. Satellites
b. Water
c. Frogs
d. Stars
Alan travels 100 km in 5hrs. Find his average speed in km/h
Answer:
The answer is 20 km/hrExplanation:
The average speed of an object given the time and distance covered can be found by using the formula
[tex]a = \frac{d}{t} \\ [/tex]
where
d is the distance
t is the time
From the question
d = 100 km
t = 5 hrs
We have
[tex]a = \frac{100}{5} \\ [/tex]
We have the final answer as
20 km/hrHope this helps you
2. Kymel is competing to see who is the fastest runner on the football team. Kymel uns
from rest to a speed of 4 m/s when he reaches the 20 meter mark in just 2 minutes.
What was Kymel's acceleration during the run?
a. 2 m/s2
b. 30 m/s2
c. 0.5 m/s2
d. 0.03 m/s2
PsX
Answer:
3
Explanation:
I just really need points man sorry
Calculate the volume of the following: (V=lwh)
A rectangular prism that is 10.0cm long, 4.0 cm wide, and 2.0 cm high.
Answer:
V= 80 cm^3
Explanation:
V= 10 * 4* 2
V= 80 cm^3
True or False? Mechanical waves do NOT need a medium to travel through.
Answer:
True
Explanation:
Mechanical waves require a medium in order to transport their energy from one location to another.
Someone please help me!!!
Answer:
i don’t understand
Explanation:
Answer:
There's no question-
The density of water is 1.00 g/cm3. The density of ethanol is 0.80 g/cm3. What is the volume of ethanol, in cm3 that has the same mass as 100 cm3 of water?
Explanation:
Given that,
The density of water is 1 g/cm³
The density of ethanol is 0.8 g/cm³
We need to find the volume of the ethanol that has the same mass as 100 cm³ of water.
Density=mass/volume
For water,
[tex]d=\dfrac{m}{V}\\\\m=dV\\\\m=1\ g/cm^3\times 100\ cm^3\\\\m=100\ g[/tex]
For ethanol,
[tex]d=\dfrac{m}{V}\\\\V=\dfrac{m}{d}\\\\V=\dfrac{100\ g}{0.8\ g/cm^3}\\\\V=125\ cm^3[/tex]
Hence, 125 cm³ of ethanol has the same mass as 100 cm³ of water.
Answer:
1.00 g/cm3
Explanation:
the volume of a cube is 64 meter cubic. what is the length of the side of the cube?
An object traveling at a constant velocity has no net force. True or False
How long does a dream typically last near the end of the sleep cycle, just before waking?
A.
about 5 minutes
B.
about 15 minutes
C.
about 30 minutes
D.
about 50 minutes
pleaseeeee hurryy
Answer:
C) about 30 minutes
Explanation:
edge 2023
answer these questions plz
1. The property of a conductor by virtue of which it posses the flow of electric current through it is called resistance.
2. The resistance of a conductor depends on the cross sectional area of the conductor and it's resistivity.
3.This id due to the fact that the resistance of a wire is inversely proportional to the square of its diameter.
4.Due to at high temperatures , the alloy donot oxidize. Alloy doesn't melt readily and get deformed.
The force of something stronger than the muscles causes it to increase its tension as it
gets longer.
False
True
The force of something stronger than the muscles causes it to increase its tension as it gets longer is true.
What is force?A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Frictional force allows the ball to stay in the hand while muscular force is employed to stop the motion of the ball during catching. Throughout this activity, the Earth's gravitational pull on the ball is constant.
The force of something stronger than the muscles causes it to increase its tension as it gets longer is true.
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Which is a true statement about a series circuit?
A.) Every part of the circuit is positively charged.
B.) The current flow through every part of the circuit is the same.
C.) The current through the circuit can take several paths.
D.) Every part of the circuit is negatively charged.
Please help, I'm on a time limit!
the answer is B your welcome
The true statement about a series circuit is: the current flow through every part of the circuit is the same. Hence, option (B) is correct.
What are series and parallel circuit?Electrical networks and two-terminal components can be linked either serially or parallelly. The electrical network that results will have two terminals and be capable of operating in either a series or parallel topology.
It depends on your point of view whether a two-terminal "thing" is an electrical network (like resistors connected in series) or an electrical component (like a resistor). In this article, a two-terminal "thing" that participates in series/parallel networks will be referred to as a "component."
Each component connected in series travels the same "electrical path" and carries the same amount of current—equal to the network's current—through it.
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Help please like I mentioned before I suck at physics
Answer:
.20 m/s
Explanation:
hope it helps
a hypothesis is
a- an experiment
b - a question
c - an educated guess ( an ' inference ;)
d - a conclusion
Answer:
D a conclusion
Explanation:
The definition of hypothesis is a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation
A 350 kg motorcycle moves with a velocity of 30 m/s. What is its kinetic energy?
10500 Joules
c. 31500 Joules
b. 157500 Joules
d. 900 Joules
Answer:
C 31500
Explanation:
1/2mv*2=KE
k.e= 350× (30)*2
=350×900
k.e= 31500
What are the properties of a photon?
Answer:
Properties of a photon would be:
does not have a electric chargedoes not have a massphotons are stableknown to carry energyExplanation:
Remember that photons are a quantum of light that carry energy while having no mass, they're used mainly in cameras and in other machinery that helps emit radiation.
Hope this helps.
How many hours would it take a plane to fly 1,500 miles if it was moving at a constant speed of 400 miles/hour.
It would take 3 hours and 45 minutes, for a plane to fly 1,500 miles if it was moving at a constant speed of 400 miles/hour.
Calculation
Round off 3.75 to the nearest one to give the hour value i.e., 3.The minutes are obtained by multiplying the fractional portion of the decimal value by 60, or 0.75 x 60 = 45.we have 3 hours and 45 minutes.What is speed?The distance traveled in a unit of time is called speed. It refers to a thing's rate of movement.This scalar quantity known as speed is the velocity vector's magnitude, It has no clear direction.A faster rate of movement is indicated by a higher speed. It is travelling more slowly if the speed is lower. It has zero speed if it isn't moving at all.The formula: can be used to determine the constant velocity of an object traveling straight forward.r = d / twhere,
r stands for rate or speed (sometimes denoted as v, for velocity)
d is the traveled distance.
t is the amount of time needed to finish the movement.
The average speed of an object over a period of time is given by this equation. We can see the object's average speed here, however at some moments over the time frame, it may have been moving faster or slower.As the time interval gets closer to zero, the maximum average speed is reached. The speed at that moment is what you see when you look at a speedometer in an automobile. While you may have briefly reached a speed of 60 mph, your average speed over the course of 10 minutes could have been much higher or much lower.M/s is the SI unit of speed (meters per second). Miles per hour or kilometers per hour are the most widely used units of speed in everyday life. A typical speed at sea is in knots, or nautical miles per hour.To learn more about speed, refer to https://brainly.com/question/24739297
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Which type of thermal energy transfer does a foil wrapping reduce the most? O A. Conduction O B. Translation O C. Radiation O D. Convection
The foil reduces radiation the most in terms of thermal energy transfer. Thermal energy transfer is the movement of heat from one place to another. The four types of thermal energy transfer are radiation, conduction, convection, and advection. The correct answer is option OC.
Foil wrapping reduces radiation as the most type of thermal energy transfer. Thermal energy transfer is the movement of energy from one place to another. There are four types of thermal energy transfer: conduction, convection, radiation, and advection. The foil wrapping reduces radiation the most. When there is a foil wrapped around food, the foil traps the heat inside the food, which reduces the radiation energy transfer. Radiation is the heat transfer that occurs in the form of electromagnetic waves. It requires no matter to move, which is why it can occur in the vacuum of space. Radiation transfer can be absorbed, transmitted, or reflected. Therefore, the correct answer is option OC.For more questions on radiation
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