A train travels a distance of 300 miles in 6 hours. What is the train's average speed?
A) 50 miles per hour
B) 50 hours per minute
C) 1800 miles per hour
D) .5 miles per hour
Answer:
A
Explanation:
Distance (d)=300 miles
Time Taken (t)=6 hours
Here, In 6 hours a train travel distance= 300m
In 1 hours a train travel distance= 300m/6
= 50
Hence, Average Speed is 50 miles per hour.
The right option is A) 50 miles per hour.
To calculate the average speed of the train in miles per hour, we use the formula below.
Formula:
S = d/t............... Equation 1Where:
S = average speed of the train.d = Total distance covered by the traint = total time.From the question,
Given:
d = 300 milest = 6 hours.Substitute these values into equation 1
S = 300/6S = 50 miles per hour.Hence, The right option is A) 50 miles per hour.
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Which increases along faults and leads to rock breaking?
A. damage
B. earthquake
C. focus
D. stress
Answer:
D. stress
Explanation:
hope this helps
Answer:
D. Stress
Explanation:
The increase along faults and leads to rock breaking would have the increase of stress from breaking a big rock
A car's velocity changes from 40 m/s to 30 m/s in 40 seconds. What is the
acceleration of the car?
Answer:
- 0.25m/s²
Explanation:
Given parameters:
Initial velocity = 40m/s
Final velocity = 30m/s
Time taken = 40s
Unknown:
Acceleration of the car = ?
Solution:
Acceleration is the rate of change of velocity with time.
So;
Acceleration = [tex]\frac{Final velocity - Initial velocity }{time }[/tex]
Acceleration = [tex]\frac{30 - 40}{40}[/tex] = - 0.25m/s²
This implies that the car will decelerate at a rate of 0.25m/s²
Nonliving and living things are made of matter.which of the following statements is true about matter
Answer:
Nonliving things are composed of pure substances, living things are made of more complex units.
Explanation:
Is this what you are asking?
A molecule contains 16 atoms and undergoes a chemical change. How does the
chemical change affect the total number of atoms of each element? (2 points)
Answer:
They remain the same
Explanation:
As the molecule goes from reactants to products, the number of atoms in the each of the element remains the same.
This is in compliance with law of conservation of matter. The law proposes that "in a chemical reaction, matter is neither created nor destroyed by changed from one form to another".
So, since no matter is destroyed, the number of atoms during a chemical change remains the same before and after a reaction.
This is applicable to all chemical changes.
A chunk of beef has a mass of 11.6 grams and a volume of 58 cm3. What is the density of the chucky beef?
Group of answer choices
46.4
0
672.8
0.2
5
Answer:
0.2g/cm³
Explanation:
Given parameters:
Mass of the beef = 11.6g
Volume = 58cm³
Unknown:
Density = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
So;
Density = [tex]\frac{11.6}{58}[/tex] = 0.2g/cm³
A force of 10N acts on a car for 3 seconds. The impulse imparted on the car is
33.3N*s
30N*s
3.33N's
0.3N's
Answer:
30N*s
Explanation:
Given the following data;
Force = 10N
Time = 3 seconds
To find the impulse;
Impulse = force * time
Substituting into the equation, we have;
Impulse = 10 * 3
Impulse = 30Ns
A 2.00 kg ball is thrown upward at some unknown angle from the top of a 20.0 m high building. If the initial magnitude of the velocity of the ball is 20.0 m/s. What is the magnitude of the
FINAL VELOCITY when it strikes the ground? (Note: Ignore air resistance.)
Answer: 28.1
Explanation:
The total energy of the ball is the sum of its kinetic and potential energy. It is equal to 792 J. Then, the final velocity of ball when its strikes the ground is 28.1 m/s.
What is kinetic energy?Kinetic energy of an object is the energy gained by its motion whereas, potential energy is stored on the object when the object is at rest.
The total mechanical energy of the ball = Ke + Pe
given, mass of the ball = 2 Kg
height h= 20 m
initial velocity = 20 m/s
Then total energy = 1/2 mv² + mgh = 2 kg [(1/2(20 m/s)² + 9.8 m/s² ×20 m ] = 792 J.
The final velocity Vf = √(2E/m) =√(2×792 J/m)/2 Kg = 28.1 m/s
Therefore, the final velocity of the ball will be 28.1 m/s.
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explain the oscillations or motion of both types of waves
Are there any steps of the rock cycle that do not connect directly to one another
Answer:
The three main rock types are igneous, metamorphic and sedimentary.
The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.
Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.
No
ALL rocks are connected in a cycle of creation, change, and destruction which is known as what is referred to as the rock cycle.
The rock cycle begins with molten rock, i.e, the magma below ground and the lava above ground, which cools and hardens to form igneous rock. These sediments can then be buried and hardened forming sedimentary rock.
RockA rock is a solid mass of geological materials. They are naturally formed, non-living earth material. Rocks are made of collections of mineral grains that are held together in a firm solid mass
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A museum sets up a display of fluorescent minerals. Which best describes how electromagnetic waves can be used to enhance the display?
Infrared light shining on the minerals will cause them to give off visible light.
Visible light shining on the minerals will cause them to give off infrared light.
Ultraviolet light shining on the minerals will cause them to give off visible light.
Visible light shining on the minerals will cause them to give off ultraviolet light.
Answer:c
Explanation:
Wave A is being decreased in temperature, and Wave B is moving from a liquid to a gas medium.
Which statement can be made about both waves?
They will speed up.
They will increase the density of their medium.
They will slow down.
They will decrease the density of their medium.
Answer:b
Explanation:
Answer:
B
Explanation:
edg
why do cameras and projectors form real images not virtual
Answer:
because concave mirror is used in them.
hope it helps.
Answer:
because only real images can be caught on a screen( or retina for the eye case)
In the figure shown, point B is called a
a. crest
Oa.
O c. diffraction
Ob.compression
d. trough
Answer:
trough
Explanation:
It is the lowest point of the wave
(Physics) Help !! I’ll give brainliest if you answer both the question in the picture and this question :
The loudness or intensity of a sound is related to its…
A. Amplitude
B. Frequency
C. Pitch
D. Wavelength
Answer:
Explanation:
i think the first questions answer is A. amplitude
the second questions answer is also A. transverse wave
Answer:
B. Frequency and transverse
what is the distance traveled by 8s and 24s?
Answer: - 0.75 m
Explanation: The displacement will be the sum of the slope of the graph within the given time. From time 8s to 16s, the slope m will be; Slope = (15 - 6) / (16 - 8) Slope = 9 / 8 From time 16s to 24s Slope = (15 - 0) / ( 16 - 2 Slope = -15 / 8 Displacement = 9/8 - 15/8 Displacement = -6/8
Displacement = - 0.75 m
HELP PLS MARKING BRANLIST 100 Pts TAKING TEST RN
A sprinter runs the 50 m dash in 5.6 seconds. What is the sprinter's speed?
280 m/s
0.11 m/s
44.4 m/s
8.93 m/s
how does temperature affect chemical reaction
What are some examples of energy being converted or transformed?
Answer:
I. A radio transforms electrical energy into sound energy = audio sound.
II. A bulb converts electrical energy into heat and light energy = light.
III. A standing fan converts electrical energy into kinetic energy.
IV. The sun converts nuclear energy into light and heat energy.
V. A microwave oven converts wave energy into heat energy.
Explanation:
Energy can be defined as the ability of a body to do work. There are different forms of energy and these includes; electrical energy, sound energy, light energy, wave energy, nuclear energy, solar energy, etc.
According to the law of conservation of energy which states that, energy cannot be destroyed but can only be converted or transformed from one form to another.
Hence, some examples of energy being converted or transformed are;
I. A radio transforms electrical energy into sound energy = audio sound.
II. A bulb converts electrical energy into heat and light energy = light.
III. A standing fan converts electrical energy into kinetic energy.
IV. The sun converts nuclear energy into light and heat energy.
A particle with charge q on the negative x axis and a second particle with charge 2q on the positive x axis are each a distance d from the origin. Where should a third particle with charge 3q be placed so that the magnitude of the electric field at the origin is zero? (Use any variable or symbol stated above as necessary.)
Answer:
The charge 3q must be placed at a distance of 1.73d away from the origin.
Explanation:
The electric field at the origin due to q at distance, d from the origin is E = q/4πε₀d².
The electric field at the origin due to 2q at distance, d from the origin is E' = -2q/4πε₀d². (It is negative since it its directed towards the negative x-axis)
Now, the net electric field at the origin due to both charges is thus E" = E + E' = q/4πε₀d² + (-2q/4πε₀d²) = q/4πε₀d² - 2q/4πε₀d² = -q/4πε₀d².
The electric field due to 3q at a distance x from the origin is E₁ = 3q/4πε₀x².
Now, the net electric field E' must cancel out E₁ so that the electric field at the origin is zero.
So, E' + E₁ = 0
E' = -E₁
-q/4πε₀d² = -3q/4πε₀x²
1/d² = 3/x²
taking inverse of both sides, we have
x²/3 = d²
multiplying both sides by 3, we have
x² = 3d²
taking square root of both sides, we have
x = (√3)d
x = ±1.73d
So, the charge 3q must be placed at a distance of 1.73d away from the origin.
A roller coaster, traveling with an initial speed of 23 m/s, decelerates
uniformly at -4 m/s2 to a full stop. How far does the roller coaster travel
during its deceleration?
I NEED STEP BY STEP EXPLANATION
Answer:
5 and 3/4 meters
Explanation:
This is because if it is slowing down by 4 meters and it was moving at 23, then you would figure out how many times 4 can go into 23 and you'd get 5 and 3/4 meters.
Two football players are running toward each other. One football player has a mass of 105 kg and is running at 8.6 m/s. The other player has a mass of 90 kg and is running at -9.0 m/s.
What is the momentum of the system after the football players collide?
A. 93 kg · m/s
B. 1,713 kg · m/s.
C. 810 kg · m/s.
D. 903 kg · m/s.
Answer:
A
Explanation:
Answer:
Answer A-93
Explanation:
238 U + 92 write the complete nuclear equation
Answer:The equation is balanced for both charge and nucleon number, as required.
Explanation:2713Al + 42He → 3015P + n
A common black ant discovers a piece of bread 85 cm east of the entrance of her nest. If the ant carries 10 bits of bread back to her nest on separate trips before moving on to other chores, what distance did she travel after discovering the bread? What was her displacement from the nest after dropping up the last bit of bread?
Answer:
19 x 85 = 1,615 for distance. Displacement is 0
Explanation:
The total distance traveled by the ant in 9 round trips and one 1/2 trip, or 19 one bash way trips: 19 x 85cm = 1615cm. The displacement of the ant after the tenth trip is 0 cm ( the displacement origin is the nest.)
TRUE if the statement is correct and write FALSE if is not.
1. Adolescents can achieve their energy and nutrient requirements by eating a variety of foods daily.
2. Eating regular meals will keep the body fueled by energy needed for the day.
3. Too much sweets and dessert can aggravate skin problems like pimples.
4. The Food Pyramid will guide you on how many servings from each food group is recommended daily.
5. Due to your rapid growth and development at this stage, you have a lesser need for certain nutrients, such as
calcium, iron, protein, and energy foods.
Answer:
1. True
2. True
3. True
4. True
5. False
Explanation:
1. Indeed, many health experts often recommend that when children reach the age of adolescents (between ages 10 and 19) they should eat a variety of foods daily in other to have enough energy and nutrients needed for development.
2. Having regular meals (mornings, afternoon, and evenings) has for long been encouraged by medical professionals in other to provide the body its fuel.
3. Some skin problems have long been associated with too much consumption of sweets and desserts since these products often contain sugars, and excess processed sugar intake is said to increase acne and eczema.
4. Just as the name suggests, the food pyramid is a visual representation that contains how many servings from each food group in other be healthy.
5. This is false because throughout the growth stages of life it is essential to get the needed food nutrients such as calcium, iron, protein, and energy foods.
Which two statements describe what happens in both nuclear fusion and nuclear fission reactions?
Answer:
.
Fusion powers the Sun and stars as hydrogen atoms fuse together to form helium, and matter is converted into energy.
nuclear fission reactors include the possibility of radiation-releasing nuclear accidents, the problems of radioactive waste disposal, and the possibility of contributing to nuclear weapon proliferation
Bro wth what is 1+1 i need help !!!! HURRY PLEASE
Answer:
2 lol
Explanation:
2.
A hydraulic jack raises a car of 250 N weight to a height of 5.8 m in 5.0 s. The jack does work at a rate of
290 W
216 W
275 W
250 W
A hiker walks with an average speed of 2.6 M Square what distance in kilometers does the hiker travel in a time of 2.8 hours
Answer:
The answer is "26.208 km"
Explanation:
Given value:
[tex]\to S= 2.6 \ \frac{m}{s}\\\\\to t= 2.8 \ hours[/tex]
Formula:
[tex]d= st\\\\d= 2.6 \times 2.8 \times \frac{60 \times 60}{1000}\\\\d= 26.208\ km[/tex]
Which ball has more potential energy?
Answer:
the steel ball has more potential
Explanation:
Answer:
steel ball has more potential energy