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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what is an amplitude??
Answer:
maximum extent of a vibration or oscillation measured from the position of equilibrium.
Answer:
the maximum displacement or distance moved by a point on a vibratng body or wave measured from its equilibrium position. it is equal to one-half lenght of the vibration path.
Explanation:
hope it helps
A 4 kg object is moving at a speed of 5 m/sec. How much kinetic energy does the object have? A. 10 joules B. 20 joules C. 50 joules D. 100 joules
Answer:
A. 10 joules
Explanation:
Given parameters:
Mass of object = 4kg
Speed = 5m/s
Unknown:
Kinetic energy of the the object = ?
Solution:
Kinetic energy is the energy due to a moving body.
So;
mathematically;
K.E = [tex]\frac{1}{2}[/tex] x m v²
m is the mass
v is the velocity
K.E = [tex]\frac{1}{2}[/tex] x 4 x 5 = 10J
The kinetic energy of the given moving object is 50 J. The Kinetic energy of an object is the energy due to its motion.
What is Kinetic energy?The Kinetic energy of an object is the energy due to its motion. It can be given as
[tex]KE = \dfrac 12 mv^2[/tex]
Where,
[tex]m[/tex] - mass = 4 kg
[tex]v[/tex] - velocity = 5 m/sec.
Put the values in the formula,
[tex]KE = \dfrac 12 4 \times 5^2\\\\KE = 50 \rm \ J[/tex]
Therefore, the kinetic energy of the given moving object is 50 J.
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The electromagnetic spectrum has waves of varying levels of energy. Which
wave has the least energy?
Answer:
Radio waves, I believe
Explanation:
Answer:
radio yes yup yup yup yup
From where does the penny that is launched into the air get its energy
Why are force fields necessary to describe electric force? 0 A. Electric force acts at a distance. O B. Electric force can only attract objects. C. Electric force is a form of gravity. D. Electric force attracts two poles.
Answer:
A. Electric force acts at a distance.
Explanation:
"Electric force," just like gravitational force is a "non-contact force." This means that even at a distance, two objects with no physical contact will create movement with the help of electric force. This leads to the concept of "force fields or field force" that explains why a charge object alters the region surrounding it. Once an object enters the region, it immediately experiences its force. An example of this is holding out one's hand near a "Van de Graaff generator." The electric force compels the hair strands to stand up.
a sprinter starts from rest and accelerates at a rate of 0.16 ms ^-2 over a distance of 50.0 meters . How fast is the athlete traveling at the end of the 50.0 meters?
Answer:
Final velocity v = 4 m/s
Explanation:
Given:
Initial velocity u = 0 m/s
Acceleration a = 0.16 m/s²
Distance s = 50 m
Find:
Final velocity v
Computation:
Using; v² = u² + 2as
v² = (0)² + 2(0.16)(50)
v² = 16 m/s
v = 4 m/s
Final velocity v = 4 m/s
A 2.5 –g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree’s trunk. What force was exerted on the bullet in bringing it to rest?
Answer:
A 2.5 g bullet traveling at 350 m/s hits a tree and slows uniformly to a stop while penetrating a distance of 12 cm into the tree's trunk. What is the initial kinetic energy of the bullet? 153.125 J Correct: Your answer is correct.Jan 8, 2020
Explanation:
FILL IN THE BLANKS here on earth, the pull of gravity on a mass of 1 kg is ......... newtons
Answer:
9.8 Newton
Explanation:
At average gravity on earth (conventionally, g=9.80665m/s2),
a kilogram mass exerts a force of about 9.8 newton
I hope this answer helps you
what are the rocky planets? theres more in the attachment
HELP ME PLS
Answer:
Explanation:
The rocky planets include Mercury, Venus, Earth, and Mars. they are made up of rocks and metals and have solid surfaces.They are the closest four planets to the Sun. The gas giants are Neptune, Uranus, Saturn, and Jupiter. they are further from the sun and are in the outer part of the solar system. I hope this helps!
The total amount of carbon dioxide in the atmosphere is estimated to have decreased by 10 to 15 percent since 1900.
True False
Answer: False
Explanation:
Accounts for about 70% of the mass-energy content of the universe. It acts in opposition to gravity.
a
pressure eventually become, causing nuclear fusion
b
objects shift toward red on the spectrum & objects are moving away
c
Spiral galaxies appear to be a rotating disk of stars and dust
Plants make food through photosynthesis, and photosynthesis takes place mostly in plant leaves, but when plants lose their leaves in the winter, they do not die. This is evidence that A. someone gives the plants food every day. B. plants can use heat in the ground to make food. C. plants store food for later use. D. photosynthesis also takes place in plant roots.
Answer:
The answer is not B or D because they need light co2 and water to make their food so B and D are out. and unless someone is walking during winter to feed it. It will not be A so the answer is C.
Explanation:
Plants can use heat in the ground to make food in winters. Plants make food through photosynthesis, and photosynthesis takes place mostly in plant leaves, but when plants lose their leaves in the winter, they do not die. Thus, the correct option is B.
What is Photosynthesis?Photosynthesis is the process through which plants use the sunlight, which is trapped in the chlorophyll pigment present in the chloroplast of cells to convert water, and carbon dioxide to produce oxygen gas and energy in the form of sugar (carbohydrate).
Photosynthesis is the process in which energy transformation takes place. In this process, light energy from the sun is converted into chemical energy that is in the form of carbohydrate in the leaves of the plant.
Therefore, the correct option is B.
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Billy is driving a bumper car for 5 minutes. In this time, Billy crashes into three other cars.
The first car is carrying another small child, the second is carrying a large adult, and the third is empty. Each car is sitting still when Billy hits it at full speed. Place the crashes in order of how much force Billy feels, from smallest to largest.
empty car
large adult
small child
<
Answer:Its empty car, small child, and then adult.
Explanation:
i took it
Answer:
Its empty car, small child, and then adult.
What is the downward pull on an object due to gravity?
mass
weight
acceleration
velocity
Answer:
Weight
Explanation:
WEIGHT - downward pull to the center of earth due to gravity
ACCELERATION - the rate of change of velocity
VELOCITY - rate of change if displacement in time
The major difference between the mass and weight is that mass of an object can never be zero but weight can be zero. The downward pull on an object due to gravity is called the weight. The correct option is B.
What is weight?The measure of the force of gravity acting on a body is defined as the weight. Actually weight is a force and its SI unit is Newton (N). The weight of an object depends on the mass and acceleration due to gravity.
The formula used to calculate the weight is:
w = mg
m = Mass of an object
g = Acceleration due to gravity
Weight is found to be a vector quantity. Because it has both magnitude and direction. It is directed towards the center of the earth or other gravity well.
When objects fall to the ground, it is the gravity which accelerates them. So the force of gravity which pulls the object downward is called the weight.
Thus the correct option is B.
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(b) The cabin and passengers have a total mass of 800 kg. The vertical distance between
B and C is 50 m.
Calculate the increase of gravitational potential energy of the cabin and passengers when they
move from B to C.
energy =
Answer:
392 kJ
Explanation:
Given that,
The total mass of the cabin and the passengers = 800 kg
The vertical distance between B and C is 50 m.
We need to find the increase of gravitational potential energy of the cabin and passengers when they move from B to C. It can be given by the relation as follows :
[tex]E=mgh\\\\E=800\times 9.8\times 50\\\\E=392000\ J\\\\\text{or}\\\\E=392\ kJ[/tex]
So, the increase in gravitational potential energy is 392 kJ.
PLEASE SOMEONE HELP!!! ANSWER IF YOU KNOW PLEASE!!! LOTS OF POINTS!!!
Answer:
i think that magnet can cause kinetic because
it is made of iron or steel that attract other magnetic things
#CarryOnLearning
Calculate the momentum of a boat with a mass of 95kg moving at 2m/Ss
Answer:
190 kg m/s
Explanation:
Momentum = Velocity × Mass
→ Substitute in values
2 × 95 = 190 kg m/s
The momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
What is Momentum?Momentum is defined as the product of mass of velocity. Momentum is a vector quantity. Mathematically, we can write momentum as -
p = mv
It is also the measure of the impact force imparted by any moving object, when it comes in contact with some other body.
Given is a boat with a mass of 95 Kg moving at 2 m/s.
Mass [m] = 95 Kg
Velocity [v] = 2m/s
We can write the momentum as -
p = mv
Substituting values, we get -
Momentum [p] = 95 x 2 = 190 Kg m/s
p = 190 Kg m/s
Therefore, the momentum of the boat of mass 95 Kg moving at 2 m/s will be 190 Kg m/s.
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Which is characteristic of uneven growth during late childhood?
a. fast growth of hands and feet
b. increase in hip width
c. widening of the shoulders
d. lengthening of the torso
Answer:
B
Explanation:
The others are natural growth developments
A car accelerates northwest from 35 to 62 m/s in a time of 14 seconds. What is the acceleration?
a = Vf - Vi / t
A) 27 m/s2 northwest
B) 1.9 m/s2 northwest
C) -1.9 m/s2 northwest
D) 61 m/s
Answer:
B) 1.9 m/s2 northwest
Explanation:
Given parameters:
Initial velocity = vi = 35m/s
Final velocity = vf = 62m/s
Time = 14s
Unknown:
Acceleration = ?
Solution:
Acceleration is the rate of change of velocity with time.
Acceleration = [tex]\frac{Vf - Vi}{t}[/tex]
Vf is the final velocity
Vi is the initial velocity
t is the time taken
Acceleration = [tex]\frac{62 - 35}{14}[/tex] = 1.93m/s² northwest
Which of the following employees derives their income from a fee for the items sold?
a commission
b. piece rate
c.salaried
d. tip
Please select the best answer from the choices provided
Answer:
i think its b because i learned this before if im wrong sorry it could be a or d
Explanation:
What are two main types of exercise???
Answer:
Endurance exercise and Strength exercise
Explanation:
Answer:
Aerob exercise and strength exercise
Explanation:
a dog running across the field at a speed of 1.2 m/s with a mass 3.2 kg
Explanation:
=0.5×3.2×1.44
=2.304J
I hope it's helpful!
Explain how are position time, velocity, and acceleration related to each
other?
please help!!! 50 POINTS
1) The diagram below models the energy involved in a reaction that changes methane gas and oxygen into carbon dioxide and water.
The graph shows a certain level of energy of reactants C H2 + 2 O2, which increases on the breaking of bonds as the atoms are separated. The energy is then consumed when the making of bonds decreases the energy of products, C O2 + 2 H2 O, to a level much lower than the energy of reactants. The energy change of negative delta H depicts the exothermic reaction.
Which observations about the energy released in making the bonds are correct?
a) It is greater than the energy absorbed in breaking the bonds. The excess is converted to chemical energy.
b) It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
c) It is less than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
d) It is less than the energy absorbed in breaking the bonds. The excess is converted to chemical energy.
2) Carbon dioxide is an example of a molecule where the component atoms of carbon and oxygen are held together by chemical bonds. Which statement correctly describes the reason for these chemical bonds?
a) The nuclei and electrons of the atoms are attracted to each other.
b) The strong nuclear energy bonds the atoms together.
c) The combination of chemical energy stored in each atom makes the bonds strong.
d) The structure of atoms increases their atomic energy, which creates the bonds.
3) When burning fuel for cooking, the pan and the food absorb energy and heat up. In this process, which form of energy is chemical energy converted into?(1 point)
a) thermal energy
b) atomic energy
c) mechanical energy
d) radiant energy
4) Which of the following statement/s about the energy involved in a chemical reaction is/are correct?
I. The energy stored in chemical bonds is kinetic energy.
II. The total energy is conserved during a chemical reaction.
III. Chemical energy can be converted to other forms of energy.
IV. Energy is needed to both break bonds and form new bonds.
a) III and IV only
b) II and III only
c) II, III, and IV only
d) I only
5) Burning coal results in several energy transformations to generate electricity. Which statement is correct about the chemical energy stored in chemical bonds between atoms when coal is burned?
a) It allows the bonds to form and then break.
b) It helps transform kinetic energy to potential energy.
c) It increases the number of atoms.
d) It converts to thermal energy.
thank you!!
Answer:
Explanation:
1. It is greater than the energy absorbed in breaking the bonds. The excess is converted to thermal energy.
2. The nuclei and electrons of the atoms are attracted to each other
3. thermal energy
4. II and III only
5. It converts to thermal energy.
When a government pays ranchers to reduce the number of milk cows they have, it is known as a what ?
O Subsidy
O Tax Break
O Productivity Schedule
O Resource Cost
I say a subsidy because the government is controlling how many cows they have.
Answer:
Subsidy
Explanation:
When a government pays ranchers to reduce the number of milk cows they have, it is known as a subsidy.
Subsidy is an incentive given by a government in form of cash or raw materials in order to achieve a common goal.
It might be to increase production of certain commodities or phase out a particular product in the market.
The subsidy helps in paying part of the production costs
What are 3 main ways to improve the Cardiovascular system???
Worth 100 points
What happens to objects in space when they no longer have force accelerating them?
Answer:An object thrown in space will move according to the forces on it in space. For instance, if you threw it in space near the Earth, it would accelerate due to the Earth's gravity. ... If there are no forces on the object, then it will move at a constant speed and direction.
Explanation:
Make a prediction that answers the question in the purpose:
“How does time affect the temperature of water?”
(Ex-“If we use a ramp, then the ball will roll faster down the ramp because gravity has more time to do work on the ball.”)
Im not good at these, please help quickly.
Describe how sound at a concert is different from the front row and the back.
what is the velocity at 11 seconds
Answer:
should be A
Explanation:
there isn't a 3, so it must be his deceleration, which would be 5-3=2