Answer:
The ball strikes the ground at 20 m/s after 2 seconds
Explanation:
Free Fall Motion
Any object that is being acted upon only by the force of gravity is said to be in a state of free fall.
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 assumed as [tex]g = 10 m/s^2[/tex].
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{2h}{g}}[/tex]
The ball is dropped from a height of h=20 m. The time taken to strike the ground is:
[tex]\displaystyle t=\sqrt{\frac{2*20}{10}}[/tex]
t = 2 s
The velocity at which the ball strikes the ground is:
vf = 10 * 2
vf = 20 m/s
The ball strikes the ground at 20 m/s after 2 seconds
Can anyone answer my questions that I've asked?
Answer:
76 N north-east
Explanation:
V = √(44²+62²) = 76 N
Sound waves are:
O Longitudinal Waves
O Transverse Waves
i need help with this question, i’ll mark as Brainliest!!
Answer:
The given Device is a :
SOLENOID.Since at the left corner, The MFL (Magnetic field lines) are entering the solenoid OR terminating at this end, This end turns out to be the SOUTH POLE.
According to the arrows, The current is always in the direction of the magnetic field. So, The current is leaving the Solenoid at the top right corner.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Answer:
The name of the device is Solenoid. Left end represents South Pole. The current ( I ) is leaving the wire coil at the top right corner.
Explanation:
Hope you understand....
What property of light waves makes it possible to use waves to transmit information between a space shuttle and NASA mission control centers on the ground?
Answer:
Explanation: Because it was able to exhibit an electromagnetic property hence, it is transverse meaning that
each wave is perpendicular to the direction of propagation.
And recall that an Electromagnetic waves can travel through a vacuum.
An induced charge is when charged particles can be attracted to neutral objects.
True or false?
Answer:
the answer is true Induction charging is a method used to charge an object without actually touching the object to any other charged object.
Explanation:
What energy transformation occurs when a coil of wire moves past a magnet? plz help :(
kinetic --> electric
electric --> kinetic
magnetic --> electric
kinetic --> potential
Answer:
kinetic energy to electrical energy.
Someone pls help mee
Objects on Mars weigh about 38% what they do on Earth. While driving on Earth, a Mars rover moves at a speed of 30 mph. If the rover moves with the same speed on Mars, would it have more, less, or the same momentum as when on Earth
Answer:
The same momentum as when on Earth
Explanation:
From a background understanding of science, the mass of an object is constant irrespective of its location.
This implies that the rover has the same mass on the earth as on the moon.
Now, we shall determine the momentum of the rover on Earth and on the Mar.
For Earth:
Let the mass on Earth (Mₑ) = 1 kg
Velocity on Earth (Vₑ) = 30 mph = 30 × 0.447 = 13.41 m/s
Momentum on Earth (Mₒₑ) =?
Momentum = mass × velocity
Mₒₑ = Mₑ × Vₑ
Mₒₑ = 1 × 13.41
Mₒₑ = 13.41 Kgm/s
Thus the momentum of the rover on Earth is 13.41 Kgm/s
For Mar:
Mass on Mar (Mₘ) = Mass on Earth (Mₑ), since mass is constant.
Mass on Mar (Mₘ) = 1 kg
Velocity on Mar (Vₘ) = Velocity on Earth (Vₑ), since the rover move with the same velocity as described by the question.
Velocity on Mar (Vₘ) = 13.41 m/s
Momentum on Mar (Mₒₘ) =?
Momentum = mass × velocity
Mₒₘ = Mₘ × Vₘ
Mₒₘ = 1 × 13.41
Mₒₘ = 13.41 Kgm/s
Therefore, the momentum of the rover on Mar is 13.41 Kgm/s
Summary:
Momentum on Earth (Mₒₑ) = 13.41 Kgm/s
Momentum on Mar (Mₒₘ) = 13.41 Kgm/s
Thus, the rover will have the same momentum as when on earth
The momentum of the object on Mars will be the same as on Earth.
The given parameters;
speed of the object on Earth and Mars, v = 30 mphWeight is a vector quantity because it changes when acceleration due to gravity on the object changes while mass is scalar quantity, with a constant value in all places in the universe.
The momentum of an object is calculated as;
P = mv (kgm/.s)
Since the speed and mass of the object will be the same on both planets, the momentum will also be the same.
Thus, the momentum of the object on Mars will be the same as on Earth.
Learn more here:https://brainly.com/question/20728229
What type of equipment do you need to play Petanque?
A broom and a stone
A metal ball and a wooden ball
Anet and a rattan ball
A rubber ball and a wooden bat
A metal ball and a wooden ball
hope it helps
What is the thermal energy of an object?
the total kinetic energy of its particles
the total potential energy of its particles
its total temperature
the total kinetic and potential energies of its particles
Answer:
The total kinetic and potential energies of its particles
The thermal energy of an object is the:
D. the total kinetic and potential energies of its particles
What is thermal energy?Thermal energy is the sum of the kinetic and potential energy of all the particles in an object.
Examples are Exothermic chemical reactions, such as oxidation, which convert the potential energy of the materials into thermal kinetic energy, thus increasing the resulting temperature.
Thus, option D is correct.
Find more information about Thermal energy here:
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The histogram shows final exam scores, and the table shows letter grades for each range of scores. A passing grade is 60% or higher.
A 90–100%
B 80–90%
C 70–80%
D 60–70%
Which statement is supported by the data in the histogram?
A. Twenty students received As and Bs.
B. Forty students received scores between 40% and 60%.
C. Most students received As and Bs.
D. Most students passed the final exam.
Answer:
D
Explanation:
Edg2020
The graph shows how the vertical velocity of a parachutist changes from the moment the parachutist jumps from the aircraft until landing on the ground. Using the idea of forces, explain why the parachutist reaches a terminal velocity and why opening the parachute reduces the terminal velocity.
Answer:
once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. ... The skydiver thus slows down. As the speed decreases, the amount of air resistance also decreases until once more the skydiver reaches a terminal velocity.
Explanation:
As the parachute is opened the air and due to the downward force of gravity the resource is upwards hence the skydiver falls slowly.
Who is a parachutist?A parachutist is one who uses a parachute when making a skydive. Once the parachute is opened the air offers some resistance and due to the downward force of gravity.
The net force and force of acceleration are on the skydiver and a, as a result, he falls slowly. As the speed gets decreased the amount of air resistance will also decrease.
Find out more information about the parachutist
brainly.com/question/26067196
The greenhouse effect is when the sun's heat is trapped in the atmosphere warming the earth. True or false
Answer:
True
Explanation:
I believe the answer is true.
What is the change in momentum of a 50. kg
woman goes from running at 8.0 m/s to 0.0
m/s?
Answer:
400 kg-m/s
Explanation:
Given that,
Mass of the woman, m = 50 kg
Initial velocity, u = 8 m/s
Final velocity, v = 0 m/s
We need to find the change in momentum of the woman. It can be given by :
[tex]\Delta p=m(v-u)\\\\=50\times (8-0)\\\\=400\ kg-m/s[/tex]
So, the change in momentum is 400 kg-m/s.
How much work is done by a 120N force applied to a box that moves 5m?
Answer:
600J
Explanation:
w=f×s
=120×5
600J
therefore the work by a force applied to a box that moves 5m is 600J
Mass of 2 x 1021 number of atoms of a
element is 0.49. What is the mass of 0.5 mole of a b
element?
Answer: The mass of 0.5 mole of element ab is 81.67 g.
Explanation:
According to the mole concept, 1 mole of a substance contains [tex]6.022 \times 10^{22}[/tex]. As, the mass of [tex]2 \times 10^{21}[/tex] atoms is 0.49 g.
So, [tex]\frac{2 \times 10^{21}}{6.022 \times 10^{23}} mol = 0.49 g[/tex]
[tex]0.003 mol = 0.49 g[/tex]
Therefore, mass of 1 mole = [tex]\frac{0.49}{0.003}[/tex]
= 163.33 g/mol
Hence, mass of 0.5 mole of ab element is calculated as follows.
[tex]0.5 mol \times 163.33 g/mol[/tex]
= 81.67 g
Therefore, the mass of 0.5 mole of element ab is 81.67 g.
can someone Please help
Answer:
22. 2 sec
23. 3 sec
24. 50 sec
Explanation:
J = (P)*(t)
t = J/P
22.
t = (80 J)/(40 W)
t = 2 s
23.
t = (2,700,000 J)/(900,000 W)
t = 3 s
24.
t = (10,000 J)/(200 W)
t = 50 s
Ms. Lachance has to pick up her daughter from the airport and is running late. As she pulls her car out of the driveway and starts to drive down the road, she takes off as fast as her car will go. When she does this her coffee cup, which she left on the hood by accident flies into the windshield making it hard for her to see. Using Newton’s first law, explain why the coffee spilt all over the windshield.
Answer:
the gravity was pulling the cup to the front of the window even though the wind was pushing it the other way.
Explanation: the gravity must be strong
By using the Newton's first law of Motion, it can be explained why the coffee spilt all over the windshield. This is because there is gravitational force which acts upon it and it pushes the substances in the downward direction towards the Earth.
What is Newton's first law of motion?
Newton's first law of Motion states that a body remains in the same state of rest or uniform motion in a straight line unless and until an external force is applied on it. This means that a body will not start moving by itself until and unless an external force acts on it.
In this case, lachance's daughter is trying to pick her coffee cup, the coffee cup at the windshield is spilt which makes it difficult for her to see. This is because, there is the gravitational force or gravity which is pulling the coffee cup to the front of the window even though the wind was pushing it in the other way.
Learn More about Newton's law here:
https://brainly.com/question/15280051
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A 1.5 kg 8-Ball is traveling at 2.3 m/s to the right when it strikes and bounces off a 5.2 kg bowling ball which is at rest. After the collision, the 8-Ball moves to the left with a velocity of 1.1 m/s. What is the final velocity of the bowling ball?
_______________m/s (nearest hundredth)
Answer:
-0.34m/s
Explanation
According to the law of conservation of momentum
m1u1 +m2 u2 = (m1+m2)v
m1 and m2 are the masses
u1 and u2 are the initial velocities
v s the common velocity
Given
m1 = 1.5kg
m2 = 5.2kg
u1 = 2.3m/s
u2 = -1.1m/s (left direction)
Required
Final velocity v of the ball
Substitute into the formula
1.5(2.3)-5.2(1.1) = (1.5+5.2)v
3.46-5.72 = 6.7v
-2.26 = 6.7v
v = -2.26/6.7
v = -0.34m/s
Hence the final velocity of the bowling ball is 0.34m/s towards the left
A geothermal power station has a power output of 300 000 W. Calculate how many kWh of energy the power station would generate in 2 days.
Answer:
The energy the power station would generate in 2 days is 14,400 kW·h
Explanation:
The given parameter for the geothermal plant are;
The power output of the geothermal plant = 300,000 W = 300 kW
The duration for which the energy produced is calculated = 2 days
Therefore, we have;
The number of seconds in 2 days = 2 days × 24 hours/day × 60 min/hr × 60 seconds/min = 172,000 seconds
The number of hours within 2 days = 2 days × 24 hours/day = 48 hours
The energy generated, E = Power × Time the power is utilized
Therefore, the energy the power station would generate in 2 days, [tex]E_{2 \ days}[/tex], is given as follows;
[tex]E_{2 \ days}[/tex] = 300 kW × 48 hours = 14,400 kW·h
while flying a plane parallel to the ground a pilot releases a fuel tank in order to reduce the planes mass. what is the tanks final velocity after falling 10 m
La velocidad vertical del tanque después de caer 10 m es 14 m/seg .
La velocidad vertical del tanque se calcula mediante la aplicación de la fórmula de velocidad , la componente vertical Vfy, del movimiento horizontal como se muestra a continuación :
Vfy=?
h = 10 m
Fórmula de Velocidad vertical Vfy:
Vfy² = 2*g*h
Vfy= √(2*9.8m/seg2* 10m )
Vfy= 14 m/seg
In which type of mixture can different parts be seen?
A.) heterogeneous
B.) molecular
C.) compound
D.) homogeneous
When you see an object that is not a light source, you are seeing light waves ___ by the object
A. reflected
B. absorbed
C. refracted
**100 POINTS**
Suppose you have a balenced stick with 3 weights on one side and only 1 weight on the other side.What needs to happen on the side with less weight for the objects to be balanced?
A.Nothing.The objects cannot be balanced
B.Move the 1 weight closer to the center
C.Set the 1 weight 3 times the distance from the center as the weights on the other side
D.Set the 1 weight 6 times the distance from the center as the weights on the other side
Answer:
B
Explanation:
balance chemical equation NaNO3=>NaNO2+O2
What’s the meaning of Density
Answer:
d= m/v
density is mass per unit volume.
Density describes how tightly packed particles are so if something is more dense the particles are going to be packed closely together and if something is less dense they will be looser and not as tightly packed.
How does friction affect energy
Answer:
Friction is a resistive force to motion. When two bodies move against each other some of the kinetic energy is converted to heat energy due to friction. This reduces the total kinetic energy in the system.
Explanation:
Which of the following are true of the temperature absolute zero? (Select all that apply)
Group of answer choices
All atoms and molecules stop moving
It is equal to 0 Kelvin
All matter becomes gas
It is equal to -273 Celsius
Answer:
1 and 2
Explanation:
Answer:
Explanation:
Answer:
I have
Step-by-step explanation:
No idea i just need points sorry wyatt
I need it now aaaasssssaaaappp!!!!
A) Pitch depends on the frequency of a sound wave. The higher the pitch, the higher the frequency and the lower the pitch, the lower the frequency. Sound waves have different pitches due to varying frequency levels.
B) Sound is created as the pen vibrates. This vibrations also interacts with the air atoms and molecules, causing them to vibrate too, therefore, creating sound waves. The reason the brain grows annoyed at this continual sound is because the brain will focus on this sound only, causing the brain to go into overdrive, creating annoyance.
C) Sound waves are travelling vibrations of particles. Space does not have any atoms or particles for the sound vibrations to interact with, therefore creating zero sound waves to travel.
Hope this helps!! :))
Nuclear energy is currently used in which three kinds of vehicles?
A. cars, submarines, spacecraft
B. submarines, ships, spacecraft
C. spacecraft, airplanes, cars
D. airplanes, submarines, ships
Answer:
d
Explanation: