Answer:
E_loss = 690000 [J]
Explanation:
The principle of conservation of Energy tells us that energy is converted from Kinetic to mechanical when the body moves from the highest point to the point where the velocity is maximum. That is, all potential energy is transformed into kinetic energy.
[tex]E_{pot}=E_{kin}[/tex]
Now we must determine the kinetic energy at the end, when the roller coaster is at the point where the reference point of power energy is zero.
[tex]E_{kin}=\frac{1}{2} *m*v^{2}[/tex]
where:
m = mass = 800 [kg]
v = 45 [m/s]
Now replacing:
[tex]E_{kin}=0.5*800*(45)^{2}\\E_{kin}=810000[J][/tex]
Now by means of the difference of the energy at the beginning minus the final energy, it determines the amount of energy that is lost by the effects of friction and heat.
[tex]E_{loss}=1500000-810000\\E_{loss}=690000[J][/tex]
A car magazine article claims that the new UltraCar 5000, only $10,000,000, can travel around a 50 m radius curve at 200 m/s.
What is the centripetal acceleration?
Does this seem to be possible?
Explanation:
it could be possible if the car has all the right aro dynamics
Two students are playing catch with a 0.20 kg baseball. The first student throws the ball at 25 m/s. How much work is done by the second student in stopping the ball?
Answer:
W = 62.5 J
Explanation:
Given that,
Mass of a baseball, m = 0.2 kg
Initial speed of first student, u = 25 m/s
Finally, the ball stops, v = 0
We need to find the work done by the second student in stopping the ball. We know that, work done is equal to the change in kinetic energy. It can be given by :
[tex]W=\dfrac{1}{2}m(v^2-u^2)\\\\W=-\dfrac{1}{2}mu^2\\\\W=-\dfrac{1}{2}\times 0.2\times(25)^2\\\\W=-62.5\ J[/tex]
So, the required work done is 62.5 J.
What is accuracy
Classification of error
Answer:
The description of the frame of reference is characterized below.
Explanation:
Accuracy, as well as regression coefficients, seem to be the new standard measures besides summing up the validity of the developed modeling techniques. Classification accuracy unfortunately due to the presuppositions established by professionals on data sources with such an equitable classification process on supervised learning mostly with completely skewed category apportionmentExplain how neutrons enable a nuclear chain reaction to take place. (2)
Answer:
Explanation:
In addition to the 'daughter' products, two or three neutrons also explode out of the fission reaction and these can then collide with other uranium nuclei which are unstable so these cause further fission reactions. This is known as a chain reaction .
Hope this helps
Convert 1 mm to meters using scientific notation. Include units in your answer.
Group of answer choices
100.0 x 10^-3 m
1.0 x 10^-3 m
10.0 x 10^-3 m
0.010 x 10^-3 m
Answer:
1.0 x 10^-3 m
Explanation:
1mm = (1/1000) m = 0.001m = 1.0 x 10^-3m (because to get 1.0, you have to movi the decimal point in the "0.001" three spots over to the right)
A tourist leaves Pittsburgh and travels 60 miles South on I-79 in 45 minutes. They exit after Wheeling and head west on I-70 and drive an additional 100 miles in 1 hour and 15 minutes. What is the tourist’s average speed?
Answer:
The tourist's average speed was 80 mph
Explanation:
Average Speed
If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:
[tex]\displaystyle v=\frac{d}{t}[/tex]
The tourist leaves Pittsburgh and travels 60 miles South in 45 minutes. Then he heads West and travels 100 miles in 1 hour and 15 minutes.
The total distance traveled is:
d = 60 miles + 100 miles = 160 miles
The total time is:
t = 45 minutes + 1 hour + 15 minutes = 2 hours
The average speed is:
[tex]\displaystyle v=\frac{160}{2}[/tex]
v = 80 mph
The tourist's average speed was 80 mph
A man is running up an escalator. He is moving 5 m/s, but the escalator is also moving up at 3.5 m/s. Find the resultant velocity.
The man's resultant velocity is
8.5 m/s up .
3. A 0.145 kg ball moving horizontally at 20 m/s is struck by a bat that causes the ball to move in the
opposite direction at 15 m/s. If the ball and bat were in contact for 5 ms, how much force did the bat
apply to the ball?
Answer:
F = 1015 N
Explanation:
Given that,
Mass of a ball, m = 0.145 kg
Initial speed, u = 20 m/s
Final speed, v = -15 m/s (as it moves in opposite direction)
The ball and bat were in contact for 5 ms
We need to find the force the bat applies to the bat. We know that,
F = ma
[tex]F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{0.145\times (-15-20)}{5\times 10^{-3}}\\\\F=-1015\ N[/tex]
So, the bat will apply 1015 N force to the ball.
A force, 10 N drags a mass 10 kg on a horizontal table with an acceleration of 0.2
m/s2. If the acceleration due to gravity is 10 m/s2, the coefficient of friction between
the moving mass and the table is?
Answer:
20&£+)##&843&()-_££-()&_2+0&&-£_!)
Weighing 15,000 N is parked on a 10 m2 hydraulic lift platform. What is the area of a small piston if a 1,100 N nozzle is used to lift the vehicle?
Answer:
[tex]A_2=0.74\ m^2[/tex]
Explanation:
Given that,
Weight, F₁ = 15,000 N
Area, A₁ = 10 m²
Weight, F₂ = 1100 N
We need to find the area of the small piston. The pressure exerted on both piston will be equal such that,
[tex]\dfrac{F_1}{A_1}=\dfrac{F_2}{A_2}\\\\A_2=\dfrac{F_2A_1}{F_1}\\\\A_2=\dfrac{1100\times 10}{15000}\\\\A_2=0.74\ m^2[/tex]
So, the area of the smaller piston is [tex]0.74\ m^2[/tex].
Suppose the Pathfinder moves at a rate of 0.2m/s for 20 seconds and then turns around and travels at the same speed for 3 seconds, what is the Pathfinder's current position?
Answer:
PLEASE BE MORE SPECIFIC
Explanation:
The pathfinder is currently 3.4 m away from its initial position. Speed can be defined by the change in position of the object over time.
What is Speed?
It can be defined by the change in position of the object over time. The distance can be calculated by the formula,
[tex]d = s \times t[/tex]
Where,
[tex]d[/tex]- distance
[tex]s[/tex] - speed
[tex]t[/tex] - times -
Initially, Pathfinder moves,
[tex]d = 0.2 \times 20 \\\\d = 4 \rm \ m[/tex]
Then he turns back and moves,
[tex]d' = 0.2 \times 3 = 0.6 \rm m[/tex]
So the current position is:
[tex]D = d - d'\\\\D = 4 - 0.6 \\\\D = 3.4\rm m[/tex]
Therefore, the pathfinder is currently 3.4 m away from its initial position.
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A child is playing with a toy car, and it accelerates
to the south from 1.2 m/s to 6.3 m/s. If the toy car's
acceleration is 2.75 m/s2, what is the amount of time
that the child takes to accelerate the car?
Answer:
1.86s
Explanation:
Given parameters:
Initial velocity = 1.2m/s
Final velocity = 6.3m/s
Acceleration = 2.75m/s²
Unknown:
Time it takes for the child to accelerate the car = ?
Solution:
Acceleration is the rate of change of velocity with time.
a = [tex]\frac{v - u}{t}[/tex]
a is the acceleration
v is the final velocity
u is the initial velocity
t is the time taken
2.75 = [tex]\frac{6.3 - 1.2}{t}[/tex]
5.1 = 2.75t
t = 1.86s
difference between dry cell and simple cell
Simple cells have liquid chemicals, making it harder for it to carry. While as dry cells have no liquid chemicals, making it easier to carry.
Need help asapppp
Thanks + BRAINLIST only if you know correct answer
1.Electromagnetic waves are
a. forms of matter
b. forms of space
C. longitudinal waves
d. transverse waves
2. A filter with vertical slits allows only waves that vibrate from side to side to pass
through
a.True
b. False
3.An electromagnetic wave is made up of vibrating an electric and magnetic fields.
a. True
b. False
Answer:
1. d. transverse waves
2. False
3. True
A relative asks your advice about a skin cream that reduces oxidation of
the lower skin layers and, thereby, reduces skin aging. Explain to her the
effectiveness of the skin cream based on that claim.
?
Answer:
Hmm
Explanation:
Answer:
Are antioxidant-rich skincare products as effective as they say they are? Best Health checked the science behind the claims.
Rusting iron and the browning flesh of an avocado both have something in common with the discoloration, wrinkles and fine lines of our aging skin: oxidation. Antioxidants counter this natural aging process, and that’s why they have been taking top billing in skin care.
Explanation:
what formula can you use to calculate average speed
Answer:
the DTS triangle
Explanation:
DTS stands for distance, time, and speed, which you can use to calculate any of the three if you have the other two.
How is mass related to potential energy?
Answer:
Potential energy is the stored energy of position possessed by an object. In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.
Explanation:
A 20-kilogram object strikes the ground with 1960 J of kinetic energy after falling freely from rest. How far above the ground was the object when it was released? *
Answer:
h = 10 m
Explanation:
Given that,
Mass of an object, m = 20 kg
It strikes the ground with 1960 J of kinetic energy after falling freely from rest.
We need to find how far above the ground was the object when it was released. Let it is h.
The kinetic energy is converted to potential energy. It can be given by the relation as follows :
[tex]E=mgh\\\\h=\dfrac{E}{mg}\\\\h=\dfrac{1960}{20\times 9.8}\\\\h=10\ m[/tex]
So, it was at a height of 10 m when it was released.
Can you please help me in this question? Help would be REALLY appreciated :)
An unknown material has a refractive index of 2.78 x106. How fast is light traveling in in this material?
Answer:
294.68
Explanation:
I hope you right answer
The velocity of light travelling in that medium = v= 107.9 m/s
What is refractive index?
It is a ratio of the velocity of light in vacuum to velocity of light in a specific medium
given
refractive index of material( u) : 2.78 * 10 ^6
c = 3* 10 ^8 m/s
velocity of light travelling in that medium(v) = ?
u = speed of light / v
v = speed of light / u
v= 3* 10 ^8 / 2.78 * 10 ^6
v= 107.9 m/s
velocity of light travelling in that medium = v= 107.9 m/s
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Which types of light are absorbed by genetic material?
ultraviolet (UV)
visible
infrared (IR)
microwave F radio
Explanation:
the answerer is visible
Genetic material is known to absorb UV light. Given what we know, we can confirm that genetic material is not known to absorb light originating from an infrared or microwave radio source.
What light does genetic material absorb?Genetic material is the hereditary substance in the cell. It carries all information specific to an organism. It is known as DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)
UV light is electromagnetic radiation, and the primary source of UV light that we are exposed to is the sun.
Therefore, given that the only form of light listed that genetic material is known to absorb is that of Ultraviolet or UV light, we can confirm that the answer to the question proposed is infrared and microwave radio light.
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Two charges repel each other with a force. If the magnitude of both charges double, but the distance between them remains constant, the force between them will
A. Double
B. Triple
C. Quadruple
D. Remain the same
Answer:
C.
Explanation:
calculate electrostatic force. PLEASE HELP ASAP !!!!!! thank you so so so much!!!! will give brainliest!!!!
Answer:
Force = 2.4 10^(-17) N
Explanation:
Recall that if you have the field, the force is easily obtained by multiplying E times the charge:
F = E * q = 150 * 1.6 10^(-19) N = 240 * 10^(-19) N = 2.4 10^(-17) N
which agrees with answer C in your list of possible answers.
This is because we see evidence of plate movement in the fact that as we look at rocks farther and farther from the ridge, the rocks--
A)Have higher iron content
B)Are made up of smaller particles
C)Become thicker and thicker
D)Are consistently older
Answer:c
Explanation:
Answer:
C
Explanation:
How many molecules are in 0.5 mol?
Answer:
1 mol of any compound (including of course CO2 and O2) contains 6.022*10^23 molecules
Therefore 0.5 mol of CO2 and O2 contains 3.01*10^23 molecules of each.
How much force is required to accelerate a 14 kg mass at a rate of 2.5
m/s2?
Answer:
The answer is 35.
Explanation:
We use the formula F=ma
volleyball falls on sand at timet 0 ms and quickly comes to rest. ... The Net Force On The Ball Over Time Is Shown Below Force (N) 3 2 T-> Time(ms ) 15 10 15 20 25 ... Note That Time Is In Ms. Kg M ..
Answer:.05 kg*m over s
Explanation:did the work
How do grocery stores arrange their items?
Answer:
How Are Grocery Store Aisles Organized? The aisles of a grocery store are organized into categories. ... Dairy aisles are along the back not connected to but close by the meat section. This will bring you back to the front of the other side of the store where the bread and bakery area is
What is the Elastic potential energy of a car spring that has been stretched 0.5 meters? The spring constant for the car spring is 90 N/m.
Answer:
PE = 11.25 J
Explanation:
Elastic Potential Energy
It's the energy stored in an elastic material like a spring of constant k, in which case the energy is proportional to the square of the change of length Δx and the constant k.
[tex]\displaystyle PE = \frac{1}{2}k(\Delta x)^2[/tex]
The car spring has a constant of k=90 N/m and it stretches Δx=0.5 m. The elastic potential energy is:
[tex]\displaystyle PE = \frac{1}{2}\ 90(0.5)^2[/tex]
Calculating:
PE = 11.25 J
Elastic potential energy is the potential energy held when an elastic item is stretched or compressed by an external force. The elastic potential energy of a car spring will be 11.25 J.
What is elastic potential energy?Elastic potential energy is the potential energy held when an elastic item is stretched or compressed by an external force. It is equal to the work done to extend the spring.
The given data in the problem is;
x is the distance by which spring got stretched = 0.5 m
k is the spring constant for the car = 90 N/m.
The formula for the elastic potential energy is;
[tex]\rm PE =\frac{1}{2} kx^{2} \\\\ \rm PE =\frac{1}{2} \times 90 (0.5)^{2} \\\\ \rm PE = 11.25\; J[/tex]
Hence the elastic potential energy of a car spring will be 11.25 J.
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How will the electrostatic force between two electric charges change if one charge is doubled and the second charge is tripled?
a. 1/6 times the original force
b. 6 times the original
c. 18 times the original
d. 1/36 of the original
Answer:
b. The force is 6 times the original
Explanation:
Coulomb's Law
The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between the two objects.
Written as a formula:
[tex]\displaystyle F=k\frac{q_1q_2}{d^2}[/tex]
Where:
[tex]k=9\cdot 10^9\ N.m^2/c^2[/tex]
q1, q2 = the objects' charge
d= The distance between the objects
Suppose one of the charges is doubled, i.e., q1=2q1 and the other charge is tripled (q2'=3q2). The new force F' would be:
[tex]\displaystyle F'=k\frac{(2q_1)(3q_2)}{d^2}[/tex]
Operating:
[tex]\displaystyle F'=k\frac{6q_1q_2}{d^2}[/tex]
[tex]\displaystyle F'=6\cdot k\frac{q_1q_2}{d^2}[/tex]
Substituting the original value of the force:
[tex]F'=6\cdot F[/tex]
b. The force is 6 times the original
The electrostatic force between two electric charges will change by 18 times the original force if one charge is doubled and the second charge is tripled. Option c. is correct .
Coulomb's law is a basic principle of electromagnetism that describes how the electric charge exerts force on other charges. The force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. When one charge is doubled and the other is tripled, the force between the two will be 18 times the original force. The electrostatic force between two electric charges is directly proportional to the product of the charges.
Therefore, when one charge is doubled and the second charge is tripled, the electrostatic force will be 18 times the original. Thus, the correct option is c. 18 times the original force.
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1 point
A box weighing 12 Newtons is dragged across a
rough floor with a constant velocity of 1.4 meters
per second. The horizontal applied force pulling
the box is 8.5 Newtons. What is the magnitude of
the friction force the floor exerts on the box?
Your answer
PLEASE ANSWER
Answer:
The magnitude of the friction force that the floor exerts on the box is 8.5 newtons.
Explanation:
From Newton's Laws of Motion and given that box is moving at constant velocity, the net acceleration of the box is zero, meaning that magnitude of friction force is equal to the magnitude of the horizontal applied force. Please notice that friction force is the reaction to the horizontal force. The equation of equilibrium for the box is:
[tex]\Sigma F = F - f = 0[/tex] (1)
Where:
[tex]F[/tex] - Horizontal applied force, measured in newtons.
[tex]f[/tex] - Friction force, measured in newtons.
If we know that [tex]F = 8.5\,N[/tex], then the magnitud of the friction force that the floor exerts on the box is:
[tex]f = F[/tex]
[tex]f = 8.5\,N[/tex]
The magnitude of the friction force that the floor exerts on the box is 8.5 newtons.
