Total displacement of the car = (0+150) Km = 150 Km
Total time taken = 2 hours
Average velocity = 150/2 Km/h = 75 Km/h
A car travels 150 km in the north direction and it takes 2 hours to cover the distance then the velocity of the car will be 75 km/hr.
What is Velocity?Velocity is the rate at which a moving object's direction changes as perceived from a certain vantage point and measured by a particular unit of time. Kinematics, the area of special relativity that investigates how bodies move, starts with the fundamental idea of speed.
In order to be explained, the scientific vector quantity known as velocity needs to have both a magnitude and a direction.
As per the provided information in the question,
The total displacement, D = 150 km north.
Total time is taken by the car, t = 2 hours.
Then, the velocity (v) of the car will be,
v = D/t
v = 150/2
v = 75 km/hr.
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why is burning a paper a chemical change
when we burn a paper it undergoes the combustion reaction.
1.020 please help!!
Mark brainliest
Answer:
0.0035 mg
Explanation:
1 mcg = 1e-3 mg
》35 mcg = 35×10^-3 mg
= 0.0035 mg
poopybutt pickle juice
Answer:
poopybutt pickle juice????? baa?
Explanation:
Rowenda is stopped on the side of the road. She then starts pedaling her bicycle for 15 seconds. Her final
velocity is 9 m/s. What is her acceleration while she is pedaling?
Explanation:
acceleration = change in velocity / change in time
a = v2-v1
- - - - - -
t
V1 = 0 ( since she stopped)
V2 = 9 m/s
t =15s
a = 9 - 0
- - - -
15
= 0.6m/s^2
Why is evolution called a scientific theory?
PLEASE HELP!!!
I think it’s either c or d
Answer:
There is lots of evidence to support it, is the correct answer
The reason why evolution is regarded as a scientific theory is because there are lots of scientific evidences to support it.
Evolution refers to the scientific thinking that complex life forms came out of simple life forms. The complex sequence of events that occurred during the transformation of simple life forms to complex life forms are described by the theories of evolution.
The reason why evolution is regarded as a scientific theory is because there are lots of scientific evidences to support it.
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State the two laws of electromagnetic induction, and state them.
write two differences between practical machine and ideal machine
Answer:
Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done. So these are the differences between Ideal Machine and Practical Machines.
Example of optical object
Answer:
Telescope,cameras
Hope it helped
image formed in a concave
The following diagram shows a
mirror.
object
image
O A. virtual, enlarged, upright
B. real, reduced, upright
C. virtual, enlarged, inverted
D. real, reduced, inverted
The image formed by the concave mirror is virtual, enlarged, and upright. The correct answer is option A.
A concave mirror is a type of spherical mirror that has a reflecting surface that curves inward, resembling the shape of the inner surface of a sphere. The inner surface of the mirror is reflective, while the outer surface is transparent.
Concave mirrors are also known as converging mirrors because they cause parallel incident light rays to converge or come together after reflection. These mirrors are commonly used in various optical devices, such as telescopes, makeup mirrors, and reflector headlights.
Option A states that the image formed by the concave mirror is virtual, enlarged, and upright. Let's break down what each of these terms means in the context of the image formation by a concave mirror:
1. Virtual: A virtual image is formed when the light rays appear to diverge from a point behind the mirror. It cannot be projected onto a screen since the light rays do not actually converge at the image position. In the case of a concave mirror, when the object is located between the mirror and the focal point, a virtual image is formed.
2. Enlarged: An enlarged image is one that appears larger than the object itself. In this case, since the image is virtual, it appears to be larger than the actual size of the object.
3. Upright: An upright image is one that has the same orientation as the object. In the case of a concave mirror, when the object is located between the mirror and the focal point, the image formed is upright.
Therefore, the correct option is A, the image formed by the concave mirror is virtual, enlarged (appears larger than the object), and upright (has the same orientation as the object).
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An engineer is given the task of comparing the fuel efficiency of four car models. She reports the following findings: Model 1, 14 kilometers per liter. Model 2, 9 miles per liter. Model 3, 56 kilometers per gallon. Model 4, 1600 meters per liter. The data for which two models consistently follow the use of SI units?
A.
Models 1 and 4
B.
Models 1 and 3
C.
Models 2 and 3
D.
Models 3 and 4
Answer:
the ans is:-
Model 4
because it uses meters
What are the similarities between theory and law ?
A law is created using a theory
If the displacement of an object is given in SI units by Dx = -3 t + 4 t 2, at t = 2 s its velocity and acceleration are, respectively:
a) positive, positive.
b) negative, positive.
c) negative, negative.
d) positive, negative.
(A)
Explanation:
If the displacement is given by
[tex]D_x = -3t + 4t^2[/tex]
Then its velocity [tex]v_x[/tex] and acceleration [tex]a_x[/tex] are then
[tex]v_x = \dfrac{dD_x}{dt} = -3 + 8t[/tex]
[tex]a_x = \dfrac{dv_x}{dt} = 8[/tex]
Evaluated at t = 2, we see that [tex]v_x = 13[/tex] and [tex]a_x = 8[/tex] and both of them are positive. Therefore, the answer (a).
Answer:
QUESTION
If the displacement of an object is given in SI units by Dx = -3 t + 4 t 2, at t = 2 s its velocity and acceleration are, respectively:
[tex]==============================[/tex]
ANSWER
a) positive, positive
[tex]==============================[/tex]
#CarryOnLearning
(◕ᴗ◕✿)
Something that accelerates undergoes a
A. Change in velocity per unit time
B. Change in direction
C. Change.
D. Change in velocity
Change in velocity per unit time.
Explanation
Acceleration is defined as rate of change of velocity w.r.t time.
[tex]\boxed{\sf Acceleration=\dfrac{dv}{dt}}[/tex]
Therefore, they
experience a
and produce
surface tension.
Answer:
Explanation:
how far will a rubber ball fall in 10 seconds
what would be the final velocity of this and what would be the average velocity
Answer:
490 meters
Explanation:
hope this helps!
The speed of sound through air is approximately 343 m/s. What is the speed in miles per hour
Answer:
At 20 °C (68 °F), the speed of sound in air is about 343 metres per second (1,235 km/h; 1,125 ft/s; 767 mph; 667 kn), or a kilometre in 2.9 s or a mile in 4.7 s.
PLEASE MARK ME BRAINLIEST.Which of the following best represents R=A+B ?
A)
B)
C)
Answer:
C
Explanation:
Options A and B are not even pointing in the direction as the vectors in the question so they shouldn't even be considered.
Option C looks like the closes since vectors A and B are pointing in a similar direction (negative x-axis)
The best representation for the resultant vector representing the resultant R=A+B would be option C because the result is represented by the closing side of the triangle, therefore the correct answer would be C.
What is a vector quantity?The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.
Examples of vector quantities are displacement, velocity acceleration, force, etc.
As given in the problem we have to find out the resultant vector from the sum of vector A and vector B,
The resultant of the vector can be calculated with the help of the triangle law of the vector addition in which the sum is given by the closing side of the triangle.
Thus, the correct answer is option C.
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Which statement is true?
The combustion of biomass can replace fossil fuels in conventional power plants.
Hydroelectric energy uses the energy from the sun, which is a renewable resource.
Oil is a non-renewable resource that is hardly ever used, so there is not a concern of depleting the Earth's supply.
Solar energy is a non-renewable resource that is used by many countries all over the world.
Answer:
Hello,
The combustion of biomass can replace fossil fuels in conventional power plants, which is true.
I hope I helped you :)
This graph shows that as an object's mass increases its
es )
A)
inertia increases.
B)
inertia decreases.
acceleration increases.
D)
acceleration decreases.
Answer:
(A) inertia increases.
Explanation:
Inertia is the property of mass that resists change so the mass an object has the greater the inertia
Which object is not accelerating?
A A baseball player sliding into home base.
B A blue Ford 150 pick-up truck speeding up from 50 mph to 80 mph.
C A ladybug crawling forward at constant rate of 2.5 m/s.
D A student riding on a Ferris wheel at a constant rate of 5.0 m/s.
C. The ladybug's speed and direction are not changing, so she has no acceleration.
In A, B, and D, either speed or direction are changing, and that's acceleration.
A bicyclist steadily speeds up from rest to 6.00m/s in 7.30s.
How far did she travel during this time?
Answer:
21.899 m
Explanation:
The explanation here is a little differe because we are starting from rest. So, everyone does physics a little differently, but what I would start with is trying to find the accelaration. I've given the formula, now you are able to plug this into the displacement formula where you Velocity Initial = 0m/s (Since you are starting from rest) and V final = 6.00 m/s...
You just plug numbers into the formula after solving for accelaration and do some simple algebra! I hope this helps! I am attaching a new pdf for visuals! If you can't open it let me know! Also there is a star by accelaration because I didn't know if I spelled it right, sorry!
List three forms of energy and how used
Explain how the lithosphere, hydrosphere, and atmosphere individually and collectively affect the biosphere. (2 points)
The lithosphere is the solid layer of Earth, the hydrosphere is the water-based part, and the atmosphere is the air, they work together to shape the biosphere.
What is the lithosphere?The lithosphere is the soil part that composes the Earth's planet (i.e., the soil), the hydrosphere refers to oceans and all water bodies, while the atmosphere is the layer of air. These three layers interact with biotic factors to shape the biosphere.
In conclusion, the lithosphere is the solid layer of Earth, the hydrosphere is the water-based part, and the atmosphere is the air, they work together to shape the biosphere.
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What is difference between magnetic flux and magnetic flux linkage?
Answer:
Magnetic flux has formular: BA while Magnetic flux linkage has formula: NBA
Explanation:
N is number of turns of a coil
B is magnetic flux density across the coil
A is area of coil
[tex].[/tex]
Which of the following is certain to change as a ball
accelerates?
A mass of the ball
B inertia of the ball
C velocity of the ball
Dforce acting on the ball occasionally
Answer:
C. Velocity of the ball
Explanation:
This is because as the acceleration of the ball increases, there will be an increase in the velocity rate and decrease in the time.
See the formula,
a=m/s²
Which of the following does not represent a question that can be answered by science?a. How much energy is released in a given nuclear chain reaction? b. Can a nuclear chain reaction be controlled? c. Should uncontrolled nuclear reactions be used for military applications?
d. What is the half-life of a waste product of a nuclear reaction?
Answer:
c. Should uncontrolled nuclear reactions be used for military applications?
Explanation:
The question on wether to use technology for military applications, is not a science question but a moral dilemma
The question that can not be answered by science is the question; "Should uncontrolled nuclear reactions be used for military applications?".
Science is empirical in its approach. This implies that the questions that are answered by science are questions that are testable and can be be verified in a laboratory.
Science does not answer questions that deal with the opinions of various individuals. That is completely outside the purview of scientific investigation.
Hence, science does not answer the question; Should uncontrolled nuclear reactions be used for military applications?
This question deals with moral values and the opinions of people about a matter and not empiricism.
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A difference between final and original position in a straight line
Answer:
For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement.
EXPLANATION:For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement.
what is the answer to {36m= ? dm}
Answer:
360
Explanation:
just add a 0 when using dm
plz help me with this question
Explanation:
Here,
initial velocity(u)=25m/s
final velocity (v)=0m/s
time taken(t)= 5 second
Now,
The working principle of a washing machine is
A) reverse osmosis
B) diffusion
C) centrifugation
D) dialysis
Explanation:
The working principle of a washing machine is centrifugation .
Answer:
The correct option is C) centrifugation
Explanation:
The washing machine consists of a centrifuge for this purpose. A centrifuge is a piece of equipment that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis of spin that can be very strong.
