A ball Of Mass. 0.5 kg initially at rest is kick directly toward offense from appoint 20 m away as shown below the velocity of the ball as it leaves the kickers foot is 16 M/S at angle 45 degrees above the horizontal the top of the fence is 4 m high the ball hits nothing Wallen flight and a resistance is negligible the acceleration due to gravity is 9.8 M/S^2 determine the time it takes for the ball to reach the plane of the fence.
Answers
Answer:
a. The horizontal component of the velocity is constant so vxt = d where vx = v0 cosθ = 16m/s t = d/v = 2s
b. The height of the ball during its flight is given by y = v0yt + ½ gt2 where v0y = v0sinθ = 12m/s and g = –9.8m/s2 which gives at t = 2s, y = 4.4m. The fence is 2.5m high so the ball passes above the fence by 4.4m – 2.5m = 1.9m
Explanation:
Related Questions
A boy exerts an unknown horizontal force as he pulls a 52 N sled across packed snow. The coefficient of friction is 0.12. If a person weighing 650 N sits on the sled, what force is needed to pull the sled across the snow at constant speed?
Answers
Answer:
0.62
Explanation:
Ff = mg = 52 N
Since the speed is constant, the friction
force equals the force exerted by the
girl, 36 N.
Ff = ukFn
so uK = Ff/Fn
= 36 N/52 N
= 0.69
Force is needed to pull the sled across the snow at constant speed is 0.62 N
What is force?A force in physics is an effect that has the power to alter an object's motion. 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.
Given in the question a boy exerts an unknown horizontal force as he pulls a 52 N sled across packed snow. The coefficient of friction is 0.12. If a person weighing 650 N sits on the sled,
Ff = mg = 52 N
Since the speed is constant, the friction force equals the force exerted by the boy, 36 N.
Ff = (uk).(Fn)
so uK = Ff/Fn
= 36 N/52 N
= 0.69 N
Force is needed to pull the sled across the snow at constant speed is 0.62 N
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hi can someone please answer the number 2 question i really need it thank you ❤️
Answers
#Batangas
[tex]\\ \tt\longmapsto d=\dfrac{49.07}{8}\times 100[/tex]
[tex]\\ \tt\longmapsto d=6.13(100)[/tex]
[tex]\\ \tt\longmapsto d=613km[/tex]
#Puerto Princesa
[tex]\\ \tt\longmapsto d=\dfrac{58.10}{8}\times 100[/tex]
[tex]\\ \tt\longmapsto d=7.26(100)[/tex]
[tex]\\ \tt\longmapsto d=726km[/tex]
#Davao
[tex]\\ \tt\longmapsto d=\dfrac{39.47}{8}\times 100[/tex]
[tex]\\ \tt\longmapsto d=4.93(100)=493km[/tex]
ultraviolet light destroys which vitamin essential for cell division?
Answers
Answer:
Both Vitamin D and folate level are affected by UV radiation from sunlight.
Explanation:
it is important to realize that an element’s line spectrum can include emissions at wavelengths throughout the electromagnetic spectrum including ultraviolet, visible, and infrared. according to the procedure in section 2, where will you be collecting data on hydrogen and helium’s line spectra?
Answers
Answer:
visible region
Explanation:
According to the procedure in section 2, in visible region the data collected on hydrogen and helium’s line spectra.
What is electromagnetic spectrum?Electromagnetic spectrum are the wave which is form of energy and includes the waves such as radio waves, gamma waves, visible light waves etc.
An element’s line spectrum can include emissions at wavelengths throughout the electromagnetic spectrum including ultraviolet, visible, and infrared.
Types of electromagnetic spectrum-
Radio waves-Radio waves are used to broadcast the signal and television signals.Microwaves-Microwaves are used in the mobile signals, Radar and in cooing the food.Infrared-Infrared transmit heat from difference sourced of fire.Visible light-This is the type of electromagnetic radiation, which is visible to the human eye.Ultraviolet-Ultraviolet electromagnetic radiation used in florescent tubes.X-rays- X-rays are used to see throughout the objects and the bodies.Gamma rays- Used in medical, to kill the cell causes cancer.
The hydrogen line spectra fall between wavelength, 410 nm to 656 nm. The helium line spectra fall between wavelength, 400 nm to 781 nm.This two fall in the visible region of line spectra.
According to the procedure in section 2, in visible region the data collected on hydrogen and helium’s line spectra.
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a matieral through which charges can flow through easily is known as what?
Answers
Answer:
the answer would be an electrical conductor
what is the relationship between electric field lines and equipotential surfaces?
Answers
online masses every 8 a.m. and 2:00 p.m. will continue
Answers
online is hard toooooooooo
Think about an object to which you have applied a force to change its velocity. Now think about an object that has a smaller or larger mass than that object. Answer the following prompt:
Describe a situation in which the force required to change the velocity of an object changes based on the mass of the object.
Describe a simple experiment you could perform that would generate data to provide evidence that the change in an object’s motion depends on either the forces on the object or the mass of the object.
Answers
Answer:
Explanation:
F=ma
1. Describe a situation in which the force required to change the velocity of an object changes based on the mass of the object.
Place both a volleyball and a bowling ball on the lower surface of an inclined plane (e.g., on an asphalt road going uphill). Roll each one up the hill and measure the difference in effort (force) each requires to start moving.
2. Describe a simple experiment you could perform that would generate data to provide evidence that the change in an object’s motion depends on either the forces on the object or the mass of the object.
Use a coiled spring to propel two objects above (volleyball and bowling ball) and observe both the distance and the velocity after leavging the spring.
A car, travelling at a speed of 30 m/s in a straight line, brakes and decelerates at a uniform rate of 2 m/s2. How much further does it travel before coming to rest?
Answers
Answer:
You are finding acceleration, so it would be 15 m/s2
Explanation:
30 divided by 2
what is the prefix of 10^10
PLEASE BE FAST :)
Answers
10*10= 100
A) half as much
B) as much
C) two times as much
D) three times as much
Answers
Answer:
3 times as much
Explanation:
half as much would be 12%, as much would be 24%, and two times as much would be 48%.
3 times as much is 72, which is about 74%
which of the following is a selectively permeable membrane?
a) nulcer membrane
b) plasma membrane
c) cell wall
d)none of these
Answers
Answer:
B
Explanation:
The plasma membrane is a selectively premeable membrane that chooses what goes in and out of the cell. The cell wall is for support and the nuclear membrane decides what goes in and out of the nucleus
Answer:
Plasma membrane
Explanation:
The plasma membrane consists of a lipid bilayer that is semipermeable.The plasma membrane regulates the transport of materials entering and exiting the cell.So, it is selectively permeable membrane.
You throw an orange out a widow at a height of 12 meters upwards at an angle of 32 to the horizontal with an initial velocity of 3.5m/s.How long will the orange be in flight before it hits the ground? Round the answer to the nearest tenth.__ Seconds
Answers
Answer:
3 meters
Explanation:
add up dum boi
Công thức tính quãng đường đi được của chuyển động thẳng biến đổi đều là:
Answers
At time t = 0 the velocity is v1. Therefore C1 = v1 and C2 = x1. Equations (1), (2), (3), and (4) fully describe the motion of particles, or bodies experiencing rectilinear (straight-line) motion, where acceleration a is constant.
which contains the particles that are vibrating fastest?
Answers
Answer:
Boiling water
Explanation:
what property of matter changes depending on location?
Answers
Answer:
weight. The force with which an object near the Earth or another celestial body is attracted toward the center of the body by gravity. An object's weight depends on its mass and the strength of the gravitational pull.
Explanation:
This may be right i'm not 100%
the magnetism of a permanent magnet results from __________.
Answers
Answer:
Explanation:
The magnetism of a permanent magnet results from the magnetic moments of electrons in the material making up the magnet interactions with Earth's magnetic field the magnetic moments of nuclei in the material making up the magnet electric currents inside the magnet.
Below is a diagram of a weight on a spring. When the weight is pulled down and then released, the spring compresses and expands. Each position indicates a different point in time.
Which of the following statements is true?
a
In all four positions, mechanical energy is 0 J.
b
The elastic potential energy of the spring at Position 2 is converted to kinetic energy.
c
The chemical potential energy of the spring is greatest at Position 4.
d
In all four positions, the gravitational potential energy of the spring is the same.
Answers
Answer:
B.
Explanation:
The elastic potential energy of the spriy at position 2 is converted to kinetic energy.
The elastic potential energy of the spring at Position 2 is converted to kinetic energy. Option (B) is correct.
What is potential energy?The energy held within an object is known as potential energy. There are several different types of potential energy, including gravitational potential energy, elastic potential energy, and electric potential energy.
Here, the energy that an object possesses as a result of its position in relation to other objects is referred to as its gravitational potential energy.
Elastic potential energy is the energy that an object possesses as a result of the stresses that exist inside its body.
At Position 2, the elastic potential energy of the spring is converted to kinetic energy.
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Is that statement true or false?
One adaptation of bioluminescent fish is that they may have lures that can produce light to help them hide from predators
A. true
B. false
Please Help!!!
Answers
When is the acceleration of a body is positive, negative and zero?
Answers
Answer:
it is 0 lol
Explanation:
Find the efficiency of a machine that does 800J of work if the input work is 2,000J
Answers
Answer:
Efficiency: 0.4 (40%)
Explanation:
The efficiency of a simple machine is given by the ratio
n = w¹/w²
where
w² is the input work of the machine
w¹ is the output work of the machine
For the machine in this problem, we have:
w¹ = 800j is the output work
w² = 2000j is the input work
Therefore, the efficiency of the machine is
n = 800/2000 = 0.4
Which can be also written as percentage:
n = 0.4 × 100 = 40%
hope it helps you
A motorboat accelerates uniformly from a velocity of 10.5 m/s to the west to a velocity of 6.5 m/s to the west. If its acceleration was 4.5 m/s2 to the east, how far did it travel during the acceleration
Answers
Answer:
7.4m ............................
Which of the following forces exists between objects even in the absence of direct physical contact
A. Contact force
B. Field force
C. Fundamental
Answers
Answer:
B. Field Force
Explanation:
Answer:
The Answer is (B) Your welcome!
at a certain distance from a point charge the electric potential is 200V and electric field is 200V/m, what is this distance
a. 10m
b. 8m
c. 0.1m
d. 0.8m
Answers
Explanation:
0.1 m
i dont know how to explain but i know the ans so ............byee ...
Mixtures can be either heterogeneous or homogeneous. Which of the following is
characeristic of a homogeneous mixture?
A mixture in which two or more substances are still distinguished (can tell there is more than one
substance).
A mixture in which large particles are suspended.
A mixture in which large particles are not suspended and eventually settle.
A mixture in which two or more substances are evenly distributed (spread out).
Answers
Answer:
Option D
Explanation:
There are two types of mixtures
HomogeneousHeterogeneousThe mixture in which one type of substances are present is called homogeneous mixture.
The mixture on which different types of substances are present is called heterogeneous mixture.
the speed of light is the ______ of its frequency and wavelength. in a vacuum, this value is a constant, ______.
Answers
Answer:
multiplication; 2.99 x 10^8
Explanation:
V = (ε x u)^-1/2 = 1/(8.85 x 10^-15 x 4π x 10^7)^1/2 = 2.99 x 10^8
is the right answer c?
Answers
Answer:
Yea I believe so
Explanation:
A fisherman notices that wave crests pass the bow of his anchored boat every 3.0 s. He measures the distance between two crests to be 7.0 m. How fast are the waves traveling?
Answers
Answer:
The time period is
T
=
3.0
s
.
The distance between two crests is
λ
=
8.0
m
.
The frequency of wave can be calculated as,
f
=
1
T
f
=
1
3.0
s
f
=
1
3
s
−
1
The speed of wave can be calculated as,
v
=
f
λ
v
=
(
1
3
s
−
1
)
(
8
m
)
v
=
2.67
m
/
s
what supports a white dwarf against the crush of gravity?
Answers
Answer: In particular, electron degeneracy pressure is what supports white dwarfs against gravitational collapse, and the Chandrasekhar limit (the maximum mass a white dwarf can attain) arises naturally due to the physics of electron degeneracy.
Explanation:
Degeneracy pressure keeps a white dwarf from collapsing under its own gravity.
What is Degeneracy pressure?Electron degeneracy pressure is a particular manifestation of the more general phenomenon of quantum degeneracy pressure.
The maximum mass that a white dwarf can support against collapse is 1.4 solar masses due to the Chandrasekhar limit.
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HOW WOULD SOUND REFLECT
Answers
Answer:
Reflection. If a sound is not absorbed or transmitted when it strikes a surface, it will be reflected. ... Reflection of a sound wave at a barrier, as if from an imaginary source at an equal distance behind the barrier. Sound reflection gives rise to DIFFUSION, REVERBERATION and ECHO.
Answer:
by a echo
Explanation:
if u are I a sound proof room you shout to the wall the echo will then reflect