Answer:
D. The skier's weight, the force of friction between the skis and snow,
and the force of air resistance
Explanation:
If two objects, such as the the skier, and skies undergo a fast velocity downward, the net force is the total force or newtons which are all components of weight as apparent to mass and gravity, friction, which is the contact force of the skis on the snow, and air resistance which limits the air resistance is the opposite force acting on the object I'm the air relative to the density of air, cross sectional area of the object, the coefficient of drag which is based on the density of the object, it's area, and dynamic air pressure.
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
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;
https://brainly.com/question/13191643
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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 :)
1. What is weight? What is mass? How are mass and weight different?
2. How does mass affect weight
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.
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
What is the difference between oceanic crust and continental crust?
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
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:
What does an osteologist do?
Answer:
Osteologists are trained to read and translate a bone's story.
Explanation:
This rare skill provides information that helps us better understand ancient cultures, solve mysteries, and learn about animals. Being an Osteologist means you have a variety of job opportunities.
Where would you find information about an organization's guidelines for moral behavior?
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 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:
which term best discribes our sun
Answer:
medium sized star
Explanation:
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.
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:
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
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
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.
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
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.
A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground. Calculate the velocity of the acorn just before it reaches the ground (rounding your answer to the integer) and its kinetic energy when hitting the ground (rounding your answer to the nearest tenth)
Answer:
The velocity of the acorn just before it reaches the ground is 19 m/s
The kinetic energy when hitting the ground is 3.1 J
Explanation:
Given;
mass of the acorn, m = 0.017 kg
height of fall, h = 18.5 m
Apply the law of conservation of mechanical energy;
mgh = ¹/₂mv²
gh = ¹/₂v²
v² = 2gh
v = √2gh
v = √(2 x 9.8 x 18.5)
v = 19 m/s
Thus, the velocity of the acorn just before it reaches the ground is 19 m/s
Now, determine the kinetic energy when hitting the ground;
K.E = ¹/₂mv²
K.E = ¹/₂(0.017)(19)²
K.E = 3.09 J
K.E = 3.1 J
Therefore, the kinetic energy when hitting the ground is 3.1 J
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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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:
my third time trying asxhcgxvbsxnsxfsgxscn gOsSHsHSHSHh look at the picture :))
change the following to celisus
a.-400f b.800f
please its urgent i will give u brainliest
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.
what's the difference between food chain and food web. i will give brainliest.
Answer:
Food chain is a linear transfer of energy from the producer to the consumer
producer →primary consumer → secondary consumer → tertiary consumer while food web is the interconnection of two or more food chains
What, exactly, is moving across the medium?
Answer:
So waves are everywhere. But what makes a wave a wave? What characteristics, properties, or behaviors are shared by the phenomena that we typically characterize as being a wave? How can waves be described in a manner that allows us to understand their basic nature and qualities?
A wave can be described as a disturbance that travels through a medium from one location to another location. Consider a slinky wave as an example of a wave. When the slinky is stretched from end to end and is held at rest, it assumes a natural position known as the equilibrium or rest position. The coils of the slinky naturally assume this position, spaced equally far apart. To introduce a wave into the slinky, the first particle is displaced or moved from its equilibrium or rest position. The particle might be moved upwards or downwards, forwards or backwards; but once moved, it is returned to its original equilibrium or rest position. The act of moving the first coil of the slinky in a given direction and then returning it to its equilibrium position creates a disturbance in the slinky. We can then observe this disturbance moving through the slinky from one end to the other. If the first coil of the slinky is given a single back-and-forth vibration, then we call the observed motion of the disturbance through the slinky a slinky pulse. A pulse is a single disturbance moving through a medium from one location to another location. However, if the first coil of the slinky is continuously and periodically vibrated in a back-and-forth manner, we would observe a repeating disturbance moving within the slinky that endures over some prolonged period of time. The repeating and periodic disturbance that moves through a medium from one location to another is referred to as a wave.
Hope That Helps!!
Explanation:
