A golf ball is hit horizontally off the edge of a 30 m high cliff and lands a distance of 25 m from the edge of the cliff. What was the initial vertical velocity of the golf ball?At what time did the golf ball hit the ground?What was the initial horizontal velocity of the golf ball? What was the final horizontal velocity of the golf ball?
Answer:
V₀y = 0 m/s
t = 2.47 s
V₀ₓ = 61.86 m/s
Vₓ = 61.86 m/s
Explanation:
Since, the ball is hit horizontally, there is no vertical component of velocity at initial point. So, the initial vertical velocity (V₀y) will beL
V₀y = 0 m/s
For the initial vertical velocity of golf ball we consider the vertical motion and apply 2nd equation of motion:
Y = V₀y*t + (0.5)gt²
where,
Y = Height = 30 m
g = 9.8 m/s²
t = time to hit the ground = ?
Therefore,
30 m = (0 m/s)(t) + (0.5)(9.8 m/s²)t²
t² = 30 m/4.9 m/s²
t = √6.122 s²
t = 2.47 s
For initial vertical velocity we analyze the horizontal motion of the ball. We neglect the frictional effects in horizontal motion thus the speed remains uniform. Hence,
V₀ₓ = Xt
where,
V₀ₓ = Initial vertical Velocity = ?
X = Horizontal Distance = 25 m
Therefore,
V₀ₓ = (25 m)(2.47 s)
V₀ₓ = 61.86 m/s
Due, to uniform motion in horizontal direction:
Final Vertical Velocity = Vₓ = V₀ₓ
Vₓ = 61.86 m/s
A runner is training and runs past meter mark 65 and starts a stopwatch. After the runner passes meter mark 15 the stopwatch stops at 8 seconds. What was the runners velocity?
Question 5 options:
-6.25 m/s
6.25 m/s
8.13 m/s
-1.88 m/s
Answer:
-6.25 m/s
Explanation:
i took the quiz
How is matter changed from one state of matter to another? *
Explanation:
Matter is changed from one state to another by addition or removal of heat and suitable pressure conditions.
When a solid is heated, it normally melts and changes to liquids which on heating changes to vapor. The randomness of the particles increases from solid to liquid state and to gaseous states.
Also, a gas can be cooled to liquid and on further cooling transformed into a solid matter.
These phase changes are brought about by energy changes in a system. Some form of matter can also sublime by changing form solid to gas and vice versa.
What is the difference between oceanic crust and continental crust?
Two blocks, with masses m1= 1.5kg and m2= 2.5kg approach each other
with initial velocities; V1= 2.0 m/s and V2i= 3.0 m/s. The two blocks
collide, in a totally inelastic collision, what is their common final velocity
after collision? *
Answer:
2.625 m/s
Explanation:
This is a momentum question. Momentum is conserved which means that all the starting momentum must be accounted for.
1.5 kg * 2 m/s + 2.5 kg * 3 m's = (1.5 + 2.5)kg * x m/s
3 kg m/s + 7.5 kg m/s = 4 kg * x
10.5 kg m/s = 4 kg x
10.5 / 4 = x
x = 2.625 m/s
inelastic means that after the collision, the masses stick together as though they were one.
Question 2
Radioactive dating involves determining which of the following?
Half-life decay
Index fossils
Depth of layers
Geologic time
Question 3
What process uses rock layers and index fossils to determine an object's estimated age?
Radioactive dating
Law of superposition
Relative dating
Geologic time
Importance of measurement
Answer:
Without the ability to measure, it would be difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the chemical industry, but it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous other occupations and activities.
Explanation:
Make sure to edit so you're not copy-writed and if this was helpful could I please get brain-list
Which statement best describes the difference between acceleration and velocity?
A. acceleration only shows a change in direction, but velocity shows a change in speed.
B .acceleration depends on direction, but velocity does not.
C. acceleration is a change in velocity, but velocity is speed in a given direction.
D. acceleration only shows change in speed, but velocity only shows a change in direction.
Answer:
C
Explanation:
acceleration is a change in velocity which means a time rate change in velocity but velocity is the time rate change in displacement
Can some one help me please and thanks
Answer:
The way in which objects exert forces on each other is described by Newton’s 3rd law of motion
Explanation:
Objects with mass exert forces on each other via the force of gravity. This force is proportional to the mass of the two interacting objects and is inversely proportional to the square of the distance between them. The factors G, M, and rare the same for all masses at the surface of the Earth.
A chemical change can be represented by ____________ changing into _____________ in a ________________.
A. Products, reactants, chemical reaction
B. Chemical reaction, reactants, products.
C. Chemical reaction, products, reactants
D. Reactants, products, chemical reaction
Answer:
D
Explanation:
Where would you find information about an organization's guidelines for moral behavior?
this will give brainliest
Answer:
It is likely to be option B: 50 degrees and 50 degrees
Hope it helps.......... pls mark as brainliest.
The carrot hangs from the ceiling by two ropes (1 and 2).
What is the correct free body diagram for the carrot?
Answer:
The Answer is D!
Explanation:
I checked it on Khan Academy.
The correct free body diagram of the hanging carrot is option B, where, the forces from two ropes and the net force acting upward and the gravitational force acting downwards.
What is free body diagram?A free body diagram is a representation of a body with different kinds of forces acting upon it with respect to its position and direction.
There are different kinds of forces namely magnetic force, tension force, nuclear force, gravitational force and the normal force etc. The force acting on a massive moving body will be the product of its mass and acceleration.
The direction of each force acting upon a body will be different and the displacement also. Here, the carrot hanged by the two ropes will experience forces from both ropes which hangs it down but the force acting is upwards and thus the net force is upward.
The gravitational force Fg acting on a body is always downward and thus the correct diagram depicting the free body of the carrot with forces is option B.
To find more about forces, refer the link below;
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suppose you want to model girlfriend of a baby orangutan which type of model would you choose
Answer:
That model grilfriend would probably only want me for the cash and would talk to a million other guys...but the baby orangutan would love me and I would be able to take care of a cute baby!!:)
Explanation:
PLEASE help!!
"A gas has an initial pressure of 296 atm, is now at 1246 atm (final pressure) and a final volume of 72 L, what is the initial volume of this gas?"
Answer:
in which standard you are, i am typing your answer till please reply.
15. Calculate The coefficient of kinetic friction be-
tween a large box and the floor is 0.21. A person pushes
horizontally on the box with a force of 160 N for a
distance of 2.3 m. If the mass of the box is 72 kg, what is
the total work done on the box?
Answer:
Wt = 26.84 [N]
Explanation:
In order to solve this problem we must use the definition of work in physics. Which tells us that this is equal to the product of force by distance.
In this case, we must sum the works of the force applied by the box and the friction force that also acts on the box.
The friction force is defined as the product of the normal force by the coefficient of friction.
f = N*μ
where:
N = normal force = m*g [N] (units of Newtons)
m = mass = 72 [kg]
g = gravity acceleration = 9.81 [m/s²]
f = friction force [N]
μ = friction coefficient = 0.21
f = 72*9.81*0.21
f = 148.32 [N]
Now the total work:
Wt = WF - Wf
where:
Wt = total work [J] (units of Joules)
WF = work by the pushing force [J]
Wf = work done by the friction force [J]
Wt = (160*2.3) - (148.32*2.3)
Wt = 26.84 [N]
Note: The friction force exerts a negative work, because this force is acting in opposite direction to the movement, therefore the negative sign.
provide two ways that objects can become charged
Answer:
friction, conduction and induction
Explanation:
Had it in class I had it correct hope this helps.
a table is pushed 15m across a room with a force of 50n.
a) what is the work don?
b) if it takes 20 seconds to push the table across the room.what is the power?
Answer:
The work is 750 J
The power is 37.5 watt
Explanation:
Mechanical Work and Power
Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.
Being [tex]\vec F[/tex] the force vector and [tex]\vec s[/tex] the displacement vector, the work is calculated as:
[tex]W=\vec F\cdot \vec s[/tex]
If both the force and displacement are parallel, then we can use the equivalent scalar formula:
W=F.s
Power is the amount of energy transferred or converted per unit of time. In the SI, the unit of power is the watt, equal to one joule per second.
The power can be calculated as:
[tex]\displaystyle P=\frac {W}{t}[/tex]
Where W is the work and t is the time.
a)
The table is pushed d=15 m across a room with a force F=50 N, thus the work is:
W=50 * 15 = 750 J
The work is 750 J
b)
The time needed to push the table is t=20 seconds, thus:
[tex]\displaystyle P=\frac {750}{20}=37.5[/tex]
The power is 37.5 watt
Which skateboarder has greater momentum?
Skateboarder A: mass = 60 kg; velocity = 1.5 m/s
Skateboarder B: mass = 50 kg; velocity = 2.0 m/s
Answer:
b
Explanation:
my third time trying asxhcgxvbsxnsxfsgxscn gOsSHsHSHSHh look at the picture :))
A race car with a 255 hp (1.90 × 105 W) engine is able to accelerate from rest to its top speed in 9.00 s. How much work does the car's engine do in this interval of time?
Answer:
W = 1710 kJ
Explanation:
Given that,
Power of a race car, P = 255 hP = [tex]1.9\times 10^5\ W[/tex]
It accelerate from rest to its top speed in 9.00 s.
We need to find the work does the car's engine do in this interval of time.
Power is given by work done per unit time. Mathematically,
[tex]P=\dfrac{W}{t}\\\\W=P\times t\\\\W=1.9\times 10^5\times 9\\\\W=1710\ kJ[/tex]
So, the required work done is is 1710 kJ.
10. A boat traveling at 9.5 m/s reduces its acceleration at a rate of 2.5 m/s2. What is the final speed of the boat
after it travels 12 meters?
Answer:
6.75m/s
Explanation:
using the second equation of motion, the time is calculated.
and with the formula a= (v - u)/t
where a is acceleration but in this case it's deceleration (and should be negated as you solve it ) .
v is final velocity
u is initial velocity
t is time taken
1. What are valence electrons used for by an element?
Answer:
An element's valence electron tells us about its ability to react and not react. More rules to this, but that's the gist of it. it also helps us form bonds
Explanation:
Valence electrons are used by an element for bonding and ionization, contributing to the element's chemical reactivity and behavior.
Valence electrons also play a vital role in ionization, which refers to the process of gaining or losing electrons to form ions. Elements tend to gain or lose electrons in order to achieve a stable electron configuration, typically by acquiring a full valence shell.
Metals, located on the left side of the periodic table, have fewer valence electrons, often one or two, and tend to lose them to form positive ions (cations). This characteristic makes them good conductors of electricity.
Nonmetals, located on the right side of the periodic table, have a nearly full valence shell and tend to gain electrons to achieve a stable configuration, forming negative ions (anions). Nonmetals generally do not conduct electricity as well as metals.
In summary, valence electrons are used by an element for bonding, where they participate in the formation of covalent and ionic bonds, and for ionization, where they are gained or lost to form ions and achieve a stable electron configuration.
To know more about electrons here
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Dr. Evil stands on a 150 m high cliff and drops the kittens straight down. Fill out the following table that shows how the velocity and acceleration of the kittens change with time during their fall.
Which type of image can be projected on a screen?
real
plane
imaginary
virtual
This Is My Last Question PLZ Help
Answer:
A real image.
Explanation:
A real image is formed by real interaction of rays, hence it is possible to project it on a screen. And where a virtual image is drawn via back tracing the path of reflected rays, hence they don't meet in reality.
A 3.2 kg ball that is moving straight upward has 17 Joules of kinetic energy. The total mechanical energy is 25 Joules.
What is the ball’s height above the ground?
What is the speed of the ball?
Answer:
h = 0.25 [m]
v = 3.26 [m/s]
Explanation:
In order to solve this problem, we must remember that mechanical energy is defined as the sum of kinetic energy plus potential energy.
E1 = Ek + Ep
where:
E1 = mechanical energy = 25 [J]
Ek = kinetic energy = 17 [J]
Ep = potential energy [J]
25 = 17 + Ep
Ep = 8 [J]
Now the potential energy is defined by the following equation:
Ep = m*g*h
where:
m = mass = 3.2 [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation [m]
8 = 3.2*9.81*h
h = 0.25 [m]
The velocity can be calculated by means of kinetic energy.
[tex]E_{k} =\frac{1}{2} *m*v^{2}\\17 =\frac{1}{2} *3.2*v^{2} \\v= \sqrt{\frac{17*2}{3.2} }\\v = 3.26[m/s][/tex]
(a) The height of the ball will be h=0.25 m
(b) The speed of the ball will be [tex]V= 3.26\ \frac{m}{s}[/tex]
What will be the speed and the height of the ball?It is given that
Mass of the ball m=-3.2kg
The kinetic energy of the ball = 17 j
The total mechanical energy of the ball = 25 J
(a) So the total mechanical energy is the sum of the kinetic energy of the ball and the potential energy of the ball.
[tex]E_T=E_{KE}+E_{PE}[/tex]
Now putting the values of the KE and the Total energy we get
[tex]25=17+E_{PE}[/tex]
[tex]E_{PE}=8 \ J[/tex]
Now the formula of the potential energy will be
[tex]E_{PE}=mgh[/tex]
[tex]8=3.2\times 9.81 \times h[/tex]
[tex]h= \dfrac{8}{3.2\times 9.81}[/tex]
[tex]h=0.25\ m[/tex]
(b) Now to find out the speed of the ball we have
[tex]E_K=17\ J[/tex]
[tex]E_K=\dfrac{1}{2} mv^2[/tex]
[tex]v=\sqrt{\dfrac{2E_{KE}}{m} }[/tex]
[tex]v=\sqrt{ \dfrac{2\times17}{3.2} }=3.25[/tex]
[tex]v=3.25 \ \dfrac{m}{s}[/tex]
So the calculated answers will be
(a) The height of the ball will be h=0.25 m
(b) The speed of the ball will be [tex]V= 3.26\ \frac{m}{s}[/tex]
To know more about Kinetic and Potential energy follow
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Eli states that sodium phosphate is a mixture because it is composed of both sodium ions and phosphate ions. Which is the best analysis of Eli's statement?
Answer:
c. It is incorrect because sodium phosphate is a compound that has a single composition.
Explanation:
As we know that the sodium phosphate i.e. chemical compounds comprise of atoms that are interconnected with the bonds of the chemicals
Also the pure substance that is made by only and only one atom or element or only one type of molecule i.e. compound that contains definite and constant composition with different properties of chemicals
the pure substances could be distinct in chemical way but not in the physical manner that represents the difference between the mixture and the pure substance
Hence, the correct option is c.
Answer:
C) - It is incorrect because sodium phosphate is a compound that has a single composition.
Explanation:
Just did the test, good luck :)
Sphere A has an excess of 10 ^ 15 electrons and sphere B has an excess of 10 ^ 13 protons. They are separated by 2.0 m. What is the force between them?
A. -0.58 N
B. 0.58 N
C. 2.30 N
D. -2.30 N
1. What is weight? What is mass? How are mass and weight different?
2. How does mass affect weight
Tyler is driving home from school and finds that there is road construction being done on his favorite route so he has to take a detour. Tyler travels 4 km North, 8 km East, 3 Km South, 4 Km West and 6 Km South. What is Tyler's displacement ?
Answer:
6.4kmExplanation:
First we must know that the direction along the vertical are towards North and south while along the horizontal are towards east and west.
Sum of distances along the vertical
4km due north = +4km
3 Km South = -3km (south is along the negative y direction)
6 Km South = -6km
total distance along the vertical = 4-3-6 = -5km
Sum of distances along the horizontal;
8km due East = +8km
4 Km west = -4m (west is along the negative x direction)
total distance along the horizontal = 8-4 = 4km
Displacement is gotten by using Pythagoras theorem
d² = x²+y²
d² = (4)²+(-5)²
d² = 16+25
d² = 41
d = √41
d = 6.4km
Hence Tyler's displacement is 6.4km
Answer:
same as other person
Explanation:
