Answer:
C
Explanation:
Given that a line starts at the origin ( 0, 0) and ends at (5, 20)
Where
V1 = 0
V2 = 20
T1 =0
T2 = 5
The slope or gradient of a velocity time graph is the acceleration.
Slope = change in V/ change in t
That is,
Slope = ( V2 - V1 )/ ( T2 - T1 )
Substitutes all the values into the formula
Slope = ( 20 - 0 )/( 5 - 0 )
Slope = 20/5
Slope = 4 m/s^2
Therefore, acceleration of the object is 4m/s^2
Answer:
The first answer is -20m/s
Explanation:
On EDGE 2021
Least
C
B
A
Greatest
i dont know if this is the same question as yours lol
As hotter material _______, ________material sinks. a. Sinks, colder b. Rises, warmer c. Rises, colder d. Sinks, warmer
Answer:
C
Explanation:
Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.
As hotter material gets colder it will sinks down. In the hotter state the molecules gets energetic and gets far apart making them free to rise in the air. Thus option a is correct.
What is sinking ?Hot air is less dense than cold air, which is why hot air rises and cold air descends. The earth's weather is controlled by hot and cold air currents. The planet is heated primarily by the sun, which also generates the planet's hot and cold air energy systems.
Since warm air currents originate over oceans, they frequently bring rain. Tropical storms and hurricanes develop at sea and eventually travel near land for this reason.
As hot air from the earth's surface rises, it rapidly turns into cold air as it approaches space. As hot air cools, it descends back to the earth's surface, where it is warmed by the ocean before rising once more. An example of this is a convection current. Thus, option a is correct.
Find more on colder air :
https://brainly.com/question/25341433
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In an area of the deep ocean, hot magma emerges from a crack in Earth’s crust. Which statement describes what will happen to the seawater above the crack as a result of convection?
Water molecules will break apart and flow in a circular pattern.
Water molecules will bond together and rise upward.
The water will become more dense and sink downward.
The water will become less dense and rise upward.
Answer: D
Explanation:
Hot magma erupts from a crack in Earth’s crust with a very high temperature that will surely break the bond of water molecules in contact. As a result of this, The water molecules will become less dense and rise upward.
Therefore, "The water will become less dense and rise upward " is the best statement to describes what will happen to the seawater above the crack as a result of convection.
The water will become less dense and rise upward because less denser materials move upward and more denser comes downward.
What will happen to the seawater above the crack as a result of convection?The seawater will become less dense and rise upward above the crack as a result of convection because water is less denser and the magma that erupts from the crack is denser due to its high viscosity.
So we can conclude that the water will become less dense and rise upward because less denser materials move upward and more denser comes downward.
Learn more about convection here: https://brainly.com/question/9382711
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Anyone know the answer to this, would kindly appreciate it
Answer:
The found value of r is:
r = 94.7
Explanation:
We know that
cosθ = Base / Hypotenuse
θ is the always the angle between base and hypotenuse
In this right angles triangle, the angle θ is given 63°.
Which means that the Base is 43 and the hypotenuse is r
Base = 43
Hypotenuse = r
Substitute θ=63°, Base = 43 and hypotenuse = r in the formula of cosθ mentioned above:
cos 63° = 43/r
Rearrange
r = 43/cos63°
r = 43/0.454
r= 94.7
List the 2 advantages and 2 disadvantages of wind as a source of electricity.
Answer:
The first 2 advantages of wind a source of electricity is that it provides you wifi and wind. 2 disadvantages of wind as a source of electricity is that to much wind could knock it down or slow down the source of the electricity.
Explanation:
I know this because i read a article on it.
How does population density differ from population size?
а. Population size takes all organisms into account while population density only takes specific age
groups of the population into account
b. Population size is the total number of organisms, while population density is the total number of
organisms within a given area
C Population size is the total number of organisms within a given area, while population density is the
total number of organisms of a specific age
d. Population size is the total number of organisms of all species, while population density is the total
number of organisms of a specific species
Answer: B
Explanation:
Population size focuses on the size of the population. That is, the total number of organisms in a population.
While population density focuses on the density of the population. That is, mean number of organisms per unit area or volume.
Therefore, Population size is the total number of organisms, while population density is the total number of
organisms within a given area
give one reason why the energy carries bu sound waves decreases as those sound waves travel through air
Calculating the Volume of a Cone
Try it
Calculate the volume of the cone.
What is the volume of a cone with a height of 27 cm
and a radius of 13 cm? Round your answer to the
nearest tenth.
VE
cm)
27 cm
113 cm
Answer:
4778.4 cm³
Explanation:
Circuit questions. Plz help. Only answer is ok
A 4.0 kg block is resting on a rough horizontal table. The coefficient of static friction us is 0.60. The static friction between the block and the table before any attempted motion is to start is N. (round to the nearest integer)
Answer: 24 N
Explanation:
Given that the
Mass m = 4 kg
Coefficient of friction (μ) = 0.60
To calculate the static friction between the block and the table before any attempted motion, you will use the formula; F = (μ)N
Where
F = static friction
N = normal reaction = mg
g = acceleration due to gravity = 9.8 m/^2
Substitutes m, g and (μ) into the formula
F = 0.6 × 4 × 9.8
F = 23.52 N
Therefore, the static friction between the block and the table before any attempted motion is 24 N approximately.
The static friction between the block and the table before any attempted motion is to start equals 23.52 Newton.
Given the following data:
Mass of block = 4.0 kgCoefficient of static friction = 0.60.To determine the static friction between the block and the table before any attempted motion is to start:
Mathematically, the force of static friction is given by the formula;
[tex]F_s = uF_n[/tex] ...equation 1.
Where;
[tex]F_s[/tex] represents the force of static friction.μ represents the coefficient of friction.[tex]F_n[/tex] represents the normal force.But, [tex]F_n = mg[/tex]
[tex]F_s = umg[/tex] ...equation 2.
Substituting the given parameters into eqn. 2, we have;
[tex]F_s = 0.60 \times 4 \times 9.8\\\\F_s = 23.52\; Newton[/tex]
Force of static friction = 23.52 Newton
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Can someone help??
The maximum acceleration of a fist in a karate punch is 4200 m/s2. The mass of the
fist is 0.60 kg. If the fist hits a wooden block, what force does the wood place on the
fist?
Answer:
F = 2520 N
Explanation:
We have,
The maximum acceleration of a fist in a karate punch is 4200 m/s². The mass of the fist is 0.6 kg.
It is required to find the force that the wood place on the fist. Force is given by the product of mass and its acceleration such that,
F = ma
[tex]F=0.6\times 4200\\\\F=2520\ N[/tex]
So, the force of 2520 N is acting on the wood.
charges can be separated in an isolated system
if earth were not tilted, would we still have seasons?
Answer:
Glad you asked that!
Explanation:
Actually,no.You see,if the earth was perfectly straight,then the northern hemisphere and southern hemisphere would have the same seasons,which is pretty much the world.But our world is tilted,so we happen to have differences for southern hemisphere and northern hemisphere.
How may the desire for a perfect lawn related to environmental pollution
Answer:
Lawns are extremely costly in many ways, including dollars spent on them, the deadly ... Using lawn equipment also significantly adds to noise pollution. ... to all of the environmental damages, including water pollution, caused by fracking. ... ONE's ambition is to remain unbiased and to provide a good
Explanation:
Answer:
The gases from the lawn mower to mow the grass, weed killer toxicity affects, too much of the seeds to help grow your grass can actually harm your grass, etc.
Explanation:
What happens when tectonic plates move away from each other? Molten matter cools and sinks towards the core. Lava travels away from the crust and forms the mantle. Molten matter seeps through the crust and forms new land. Lava seeps into the ground through the cracks in the ground.
list the three components of effective communication and give an example of each
Answer:
The three components of effective communication are:
Sending CommunicationReceiving CommunicationFeedbackExplanation:
1) Sending CommunicationOne should think about what he is going to say, structure his message and focus clearly on a the purpose of sending a message. For example if an employer wants to communicate an employee to improve his performance, he should focus hid communication on the results rather than on his failures.
2) Receiving CommunicationThe person on the other end of the communication should be a good listener. For example in the example given, even if the employer effectively communicates his side of the communication, but the employee is not paying his full attention to what his boss is saying, he wouldn't be able to make much of a difference.
3) FeedbackAfter sending and receiving communication, feedback should be given to complete the communication effectively. For example the employer may tell his boss about what he understood from his boss's speech, or what will he do to improve his performance.
physics question please help
Use the following to answer question 46
I . increase the current
II. use a stronger magnet
III. use thicker wire
IV. reverse the battery
V. add more coils of wire inside the magnet
46. To increase the force with which the wire is pushed when the switch is closed, which of
the following things could be done?
a. I and II only
b. II, III, and IV only
C. II and IV only
d. I, II and V only
47. A group of students had built a homemade motor and were in the process of trying to
test it. When they hooked it up to their battery they found that the wires in their coil got hot, but the coil would not turn. Of the following solutions, which would be their best
course of action to make the motor spin?
a. add more wire to the coil
b. use a stronger magnet
C. use a higher voltage battery
d. plug into an AC source
Answer:
46.) A
47.) A
Explanation:
46.) To increase the force with which the wire is pushed when the switch is closed, the current flowing through the wire should be increased and the stronger magnet should be used.
Remember that
F = BIL
The force is directly proportional to magnetic field B and current I
a. I and II only
47.) Since the wires in their coil got hot, and the coil would not turn, this is overheating which may be as a result of to much voltage supply compare to the length of the length of the coil of wire. To correct this, more wire should be added to the coil.
How do Newton's laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can
pass a puck as quickly as possible?
OSmooth ice reduces the inertia of the hockey puck.
Smooth ice increases the force used to accelerate the hockey puck.
Smooth ice reduces the unbalanced forces that would slow the hockey puck.
Smooth ice decreases the reaction force that the ice exerts on the hockey puck.
Save and Fxit
Answer:
c
Explanation:
edge 2021
Which vector is the sum of the vectors shown below?
Spaceship 1 and Spaceship 2 have equal masses of 300kg. They collide. Spaceship 1's final speed is 3 m/s, and Spaceship 2's final speed is 2 m/s in the same direction. What is their combined momentum? A. 600 kg-m/s B. 1,500 kg-m/s C. 1,200 kg-m/s D. 900 kg-m/s
Answer:
B. 1500 kg*m/s
Explanation:
Momentum p = m* v
In any type of collision, the total momentum is preserved!
The total momentum before and the total momentum after the collision is the same. We know the mass and speed after the collision so we can calculate the total momentum.
p1 + p2 =
m1*v1 + m2*v2
m1 = me = 300 kg
v1 = 3 m/s
v2 = 2 m/s
Substitute the given numbers:
300*3 + 300+2
900 + 600
1500 kg*m/s, which is answer B.
Which of the following is an example of a device that uses a wheel and axle?
Check all that apply
A. frisbee
B. light bulb
C. doorknob
D. bicycle
(multiple answers)
Light rays travel along _____ paths. A. curved B. straight C. changing D. unpredictable
Answer: Straight :)
Explanation:
LIght rays travel in straight paths and it is impossible for them to travel in curved, unpredictable, and changing paths
Which converts mechanical energy to electrical energy?
A. A flashlight
B. An electric motor
C. A generator
D. An electromagnet
Answer:
c. A Generator
Explanation:
The whole point of a generator is to produce electrical energy. The generator will use a mechanical motor usually running off of gas to produce electricity.
formular for calculating resistors in parallel
Answer:
Answer is 1/RT=1/RT1+1/RT2+1/RT3
if san andreas fault slips 2.5 cm each year how far would it separate in 100 years
Answer:
250cm or 2.5m
Explanation:
using direct variation
the length is = l
the time (year) = t
let k be the constant
so he have:
l=kt
2.5=k× 1
k= 2.5
Now in the next statement the 100 is given but not the length so
l=kt
~ l=k× 100 years
But k = 2.5
so :
l= 2.5×100
l= 250 cm
Hence it will be 250cm or 2.5m at which they will get separated