Answer: 20.4 miles
Explanation:
Here we need to use the equation:
Velocity = Distance/Time.
Initially we have that he can travel 30 miles in 2 hours, so the velocity is:
V = 30mi/2h = 15mph
Now, we reduce the velocity by 3 mph, so the new velocity is 15mph - 3 mph = 12mph.
Now we want to know the distance traveled in 1.7 hours with this velocity, this is.
Velocity*Time = Distance
12mi/h*1.7h = 20.4 miles
Which of the following describes how the current in a circuit can be increased? Select all that apply.
A.
increase the voltage and the resistance
B.
increase the voltage while keeping the resistance constant
C.
decrease the voltage and the resistance
D.
decrease the resistance while keeping the voltage constant
Answer:
B. and D. would be my best guess.
Explanation:
The reason why is because if you lower the resistance, the voltage will be higher, and if you higher the voltage, the resistance would be lower and the voltage would higher.
An ohmmeter is a common device for measuring resistance. Using an ohmmeter, you find that a certain material has a very high resistance. This material is most likely what?
conductor
insulator
semiconductor
superconductor
Answer:
An insulator
Explanation:
Insulators have a very high resistance because the electrons of the insulator are bounded strongly with the nucleus. Hence it requires more voltage to move an electron from the valence band to the conduction band.
An airplane moves in straight level flight at constant velocity. What is the
net force acting on it if the mass of the plane is 1000 kg and the frictional
drag of the air is 1800 N? *
Answer:
Net force = 0
Explanation:
We have, an airplane moves in straight level flight at constant velocity.
Mass of the plane is 1000 kg
The frictional force acting of the air is 1800 N.
It is required to find the net force acting on it. We know that net force is given by the product of mass and acceleration. But here the airplane moves with constant speed, it means its acceleration is equal to 0 such that net force is equal to 0.
does space have plenty of oxygen
Answer:
I don't think so because we can't breathe in space
Explanation:
Answer:
No
Explanation:
There is no oxygen in space, so astronauts must bring tanks of oxygen
Which of the following provides the best summary of the process of natural
selection?
A. Population sizes increase with every generation.
B. Individuals pass on their best traits to their offspring.
C. Mutations help an individual survive and reproduce.
D. Well-adapted individuals survive and reproduce.
Answer:
B. Individuals pass on their best traits to their offspring.
Explanation:
because genes are always passed from parents to offspring.
The best summary of the process of natural selection is Individuals pass on their best traits to their offspring. Hence, the correct option is B.
What is the theory of Natural selection?The theory of natural selection gives the mechanism of evolution. It defines the method of different survival and reproduction of individuals due to differences in phenotype.
The theory of natural selection was proposed by Charles Darwin as a way of adaptation and speciation. The variations occur in organisms by random mutations occurring in the genome of individual organisms and this change in mutations may inherit in offspring.
Organisms that are more adapted to the environment are more likely to survive and pass on the genes to future generations. This process cause changes to the generations and diverged over time.
The organisms produce more offspring that are able to survive in the environment. The four factors of natural selection are Variations, Inheritance, Selection, and time.
Thus, the best summary of the process of natural selection is individuals pass on their best traits to their offspring. Hence, the ideal solution is option B.
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Signals that are broken up into binary code are characterized as
Well I have 2 examples.
AM/FM radio is a perfect type of technology.
A smart phone is also a great presentation of technology.
Answer:Continuous signals
A uniform electric field contains a number of particles. All are experiencing forces in the same direction as the electric field. What can be concluded from this?
All the particles have negative charges.
All the particles have positive charges.
All the particles are charged, but they may be positive or negative.
All the particles must be uncharged.
Answer: D
All the particles must be uncharged
Explanation:
If all the particles are positively charged, then there will be force of repulsion between them which will give different directions away from each other. The same is applicable if they are all negatively charged.
If the particles are positively and negatively charged, their will be force of attraction between them which will give different directions towards each other.
For all to be experiencing forces in the same direction, We can conclude that
All the particles must be uncharged.
Answer:
This picture represents the electric field diagram between two particles with static charges.
Do the two particles have the same charge?
✔ no
If the particles are free to move, what affect will the two particles have on each other?
✔ They will attract each other.
If a third particle was added to this field with a positive charge, what would it be attracted to?
✔ B
If an uncharged particle was placed between A and B, which way would it move?
✔ neither direction
Explanation:
What is the net force acting on a .15 kg hockey puck accelerating at a rate of 12 m/s2
Answer:
The net force is 1.8N
Explanation:
Given that the formula for force is Force = mass×acceleration. So you have to substitute the values into the formula :
[tex]force = mass \times acceleration[/tex]
Let mass = 0.15kg,
Let acceleration = 12m/s²,
[tex]force = 0.15 \times 12[/tex]
[tex]force = 1.8[/tex]
Answer:
1.8 Newtons
Explanation:
We want to figure out the net force acting on a 0.15 kg hockey puck that has an acceleration of 12 m/s². To solve this, we must apply Newton's Second Law of Motion which is denoted by the formula: f = ma.
Here, f is the force, m is the mass, and a is the acceleration. Plug our given values in to find f:
f = ma
f = (0.15 kg) * (12 m/s²) = 1.8 Newtons
Thus, the answer is 1.8 N.
~ an aesthetics lover
The functional unit of the kidney is the ________?
Answer:
nephron
Explanation:
I can't really explain this one.
Answer:
nephron
Explanation:
thats what it is
In a nuclear reaction, which of the following must be conserved?
A. the number of neutrons
B. the count of nucleons
C. charge
D. the number of electrons
Answer:
c
Explanation:
Answer:
c
Explanation:
This graph provides data on the amount of water needed to grow four different crops, each used to produce ethanol, a fuel. For each crop, the data shows how many liters of water are needed to produce one liter of ethanol fuel. Which of the following would require using the most water? *
Producing 100 L of ethanol from sugar cane
Producing 200 L of ethanol from sugar beet
Producing 300 L of ethanol from potatoes
Producing 400 L of ethanol from corn
Answer:
Producing 300 L of ethanol from potatoes
Explanation:
From the diagram, one liter of ethanol production from sugar cane requires 2000 liters of water. Hence, in order to produce 100 L of ethanol from sugar cane, 2000 x 100 = 200,000 L of water.
1000 liters of water is needed to produce 1 liter of ethanol from sugar beet. Hence, 200 x 1000 = 200,000 L of water will be needed to produce 200 liters of ethanol.
1000 liters of water is also required to produce 1 liter of ethanol from potatoes, hence, 300 x 1000 = 300,000 L of water would be required to produce 300 L of ethanol from the same material
About 500 liters of water is required to produce 1 liter of ethanol from corn, hence, 400 x 500 = 200,000 L of water would be needed to produce 400 L of ethanol from corn.
In conclusion, producing 300 L of ethanol from potatoes would require using the most water among all the options.
a force of 20 N acted on a ball thereby imparting an impulse of 70 Ns to the ball. For how long did the force act on the ball?
Answer:3.5 seconds
Explanation:
Determine What is the efficiency of a machine whose work output is 4 joules, and whose work input is 10 joules?
Answer:
The efficiency of the machine is 40 %.
Explanation:
We have,
Output work by the machine is 4 joules and the input work is 10 joules.
It is required to find the efficiency of a machine. The efficiency of a machine is given by the ratio of output work to the input work. It is given as :
[tex]\eta=\dfrac{4}{10}\times 100\\\\\eta=40\%[/tex]
So, the efficiency of the machine is 40 %.
Each antibody can recognize how many types of invaders of the body? A. 1 B. 10 C. 100 D. 1,000
Answer: D. 1,000
Explanation:
The antibodies are special proteins which can detect the foreign antigens in the body of the host and fight against these antigens. This way the antibodies prevent the infection in the body.
There are five different classes of antibodies in the human body these are IgA, IgG, IgM, IgE and IgD. Each antibody can recognize more than 1,000 antigens of foreign pathogens.
Please help! I will give Brainliest! The image shows a cross section of a landscape and a well.
1: Land surface. 2: Unsaturated zone. 3: Groundwater. 4: Saturated zone.
Please Hurry timed test! Which of the layers shown is an aquifer?
1
2
3
4
Answer:
3!
Explanation:
have a nice day
Determining Charge
An element becomes a positively charged ion when it
oloses protons.
loses electrons.
gains electrons
gains neutrons.
Answer:
hey friend,
an element becomes a positively charged ion when it loses electrons
The pressure of water at the bottom of a well is _________ than at the surface of the pond.
Answer:
Greater
Explanation:
When you go deeper in water, the presure increases, the deeper you go, so it would be greater in a well then the surfce of a pond. Hope this helps!
Convection currents not only in the Earth's core but in what?
A. Only liquids
B. When a dense substance is warmer than a less dense substance
C. In both liquids and gases
D. Weakly in solids
Answer:
B. When a dense substance is warmer than a less dense substance
Explanation:
Can someone please help me with this?
Answer:
the answer is A.
Answer:
The Answer Is B.
It's Hard To Explain You Just Have To Trust Me
Explanation:
If It's Correct (Which i am certain that it is) can you plz award me with Brainliest
A loop with a break in it that prevents current from flowing is called a(n)_______
circuit.
Answer:
an open circuit
Explanation:
A tennis ball and a solid steel ball of the same diameter are dropped at the same time. Which ball has the greater amount of force acting on it?
The steel one.
The steel one has more force due to the weight and mass.
An object's mass is a crucial indicator of how much stuff it contains. The gravitational pull of an object is measured by its weight. It is influenced by the object's location in addition to its mass. As a result, weight is a measurement of force.
What ball has the greater amount of force acting on it?The heavier (denser) object will fall quicker if two identically sized but made of different materials objects are present. This is because both objects will experience the same drag and buoyancy forces, but the heavier object will experience a stronger gravitational pull.
Things fall to the earth faster as a result of gravity. Acceleration is a modification of velocity, and velocity is a measurement of the direction and speed of motion. The longer an object is in free fall, the faster gravity makes it tumble toward the ground.
Therefore, solid steel ball have high mass and greater amount of force acting on it.
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Identify the magnetic north pole of Earth’s magnet?
Answer:
using magnets
Explanation:
If we hang a magnet with a rope to an object the north pole of the magnet will point to the Earth's north pole
Which phrase correctly describes ice?
A) Rigid and having low viscosity
B) Crystalline and having high surface tension
C) Amorphous and having low viscosity
D) Crystalline and rigid
Answer: D) Crystalline and rigid
Explanation:
Ice is considered to be a rigid mineral. It possesses a regular crystalline structure based on the molecule of water, which consists of a single oxygen atom covalently bonded to two hydrogen atoms, or H–O–H.
Answer: D
Explanation:
Which term is defined as the force applied to the object divided by the mass of the object?
speed
velocity
mass
acceleration
Answer:
acceleration
Explanation:
From the question: "FORCE... divided by the MASS..." is translated to a math equation as "F / m", where "F" is the force and "m" is the mass.
Now, the second Newton's law says "F = m . a ", where a is acceleration.
If you move m to the left side, clearly you have "F / m", and "a" is alone to the right. Math equation:
a = F / m
acceleration = force / mass
How much current must be applied across a 60 Ω light bulb filament in order for it to consume 55 W of power? Unserious answers will be deleted, and reported. (Please show some work)
Answer: current I = 0.96 Ampere
Explanation:
Given that the
Resistance R = 60 Ω
Power = 55 W
Power is the product of current and voltage. That is
P = IV ...... (1)
But voltage V = IR. From ohms law.
Substitutes V in equation (1) power is now
P = I^2R
Substitute the above parameters into the formula to get current I
55 = 60 × I^2
Make I^2 the subject of formula
I^2 = 55/60
I^2 = 0.92
I = sqr(0.92)
I = 0.957 A
Therefore, 0.96 A current must be applied.
Science question!! Please help
Answer:
It lasted two hours or 120 minutes, it would be smart to say that he was riding up it during the interval 20-60min and riding down it during the interval 60-80min. This is an assumption made because of his speed, when going up a hill our speed is slower while when riding down it, you gain a lot of speed.
the two ways you could increase acceleration
Answer: mass(how much the object weighs) and force(how hard you push the object)
Explanation:
For each of the following solutions, name the solvent and the solute
Saltater
Seltzer water
Lemonade made from powdered drink mix
Answer:
Explanation:
The solvent in all the given solutions is water. The solute in the salt water is salt and the solute in the seltzer water or carbonated water is carbon dioxide. The solute in lemonade is lemon pulp juice.
What is a solution?A solution is the combination of a solute and a solvent. The solute can be of completely soluble , partially soluble or insoluble in the solvent. The completely dissolving solute forms a homogeneous solution.
A partially soluble or insoluble solution solutes form heterogeneous solutions. The solubility depends on the bond type, mass, pressure, temperature etc.
The solution salt water is formed by dissolving salt in the solvent, water. Similarly, the seltzer water or carbonated water is formed by carbon dioxide dissolved in water solvent.The solute in lemonade is lemon juice and solvent is water.
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75 points!
In a particular chemical reaction, the energy of the reactants is 30 kJ and the energy of the products is 5 kJ. The maximum energy of the system is 40 kJ.
A. Sketch a potential energy diagram for this reaction. Make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.
B. What is the activation energy for this reaction?
C. What is the enthalpy change for this reaction?
D. Is this reaction endothermic or exothermic? Explain your answer in two ways: first, using the energy values, and second, by referring to the shape of the graph.
Answer:
The activation energy of a chemical reaction is the energy require to form the activated complex and the activated complex then converted to product. The activation energy is always positive for both endothermic and exothermic reactions.
Explanation:
pls if im worng add a star pls
Two chickens are bred and produce the following numbers of offspring. What are the most likely appearances of the parents?
Table of offspring
A. Both parents have red/white feathers.
B. Both parents have white feathers.
C. One parent has white feathers, and one parent has red/white feathers.
D. One parent has white feathers, and one parent has red feathers.
Answer:
Well, Your best answer will be is C. One parent has white feathers, and one parent has red/white feathers.
GOOD LUCK!~
[tex]^{By[/tex][tex]^{Itsbrazts[/tex]
Answer:
c
Explanation:
