Answer:
v= +12cm
Explanation:
m = (size of image)/(size of the object) = -v/u
u = - 8 cm
3/2 = -v/u
3/2 = -v/-8
v = +12 cm
Using mirror formula,
1/v + 1/u = 1/f ...(i)
1/12 + 1/(-8) = 1/f
f = -24 cm
Focal length is 24 cm
A ball is dropped off the side of a bridge after 1.55 seconds how far has it fallen (units=m)
Answer:
d = 11.77 m
Explanation:
Given that,
A ball is droped off the side of a bridge after 1.55 seconds.
We need to find how far it has fallen.
It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²
Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
Put u = 0 and a = g
So,
[tex]d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m[/tex]
Hence, it will fall at a distance of 11.77 m.
Answer:
-11.77!!!! DONNT FORGET NEGATIVE
Explanation:
What is the rate which distance changes over time.
Answer: Speed
Explanation:
Speed is Defined as defined as D/T or distance over time
As a ball rolls downhill it increases in speed from 6 km/hr to 3 m/s in 5 seconds. What is
the acceleration of the ball in m/s squared?
(This question is also math)
Answer:
0.267 m/s^2
Explanation:
6 km/hr * 1hr/ 3600 sec * 1000m/ 1 km
1.67 m/s to 3 m/s
vf=vi+at
3 m/s= 1.67 m/s+ a(5 s)
a=0.267 m/s^2
A football was kicked so that it traveled 65 yards in 3.0 total seconds. What was the speed
and angle above horizontal that the ball was kicked?
Answer:
vx = 65 yd/3 sec = 21.7 yd/sec since horizontal speed is constant
vy = g t = (32 / 3) yd/sec^2 * 1.5 sec = 16 yd/sec where 32/3 is the acceleration due to gravity in yds / sec^2 and 1.5 is the time to travel each way in the vertical direction
V = (vx^2 + vy^2)^1/2 = (21.7^2 + 16^2)^1/2 = 27 yd/sec
tan theta = vy/vx = 16 / 21.7 = .737 theta = 36.4 deg
You can check using the range formula:
R = v^2 sin (2 theta) / g = 27^2 * .955 / (32 / 3) = 65.3 yds
The difference from 65 yds may be rounding error.
A 20,000 kg jet plane is accelerating at 2 m/s2. How much force does it put forth?
Answer:
40,000N of force
Explanation:
The formula for force is F=ma. If we plug in the values, F=(20,000kg)(2m/s^2).
a cricket ball is hit so that it travels straight up in the air and it require 3 second to reach the maximum height its initial velocity is
Answer:
v = u - gt
At maximum heitht, v = 0
0 = u - (9.8)(3)
u = 29.4 m/s initial velocity
What are two ways engineers use their understanding of kinetic energy and potential energy to make their designs better/ safer?
Answer:
On a roller coaster, energy changes from potential to kinetic energy and back again many times over the course of a ride. Kinetic energy is energy that an object has as a result of its motion. Traditionally, the coaster cars are pulled up the first hill by a chain; as the cars climb, they gain potential energy.
Mechanical engineers are concerned about the mechanics of energy — how it is generated, stored, and moved. For example, mechanical and civil engineers ensure that there is sufficient potential energy, which is converted to kinetic energy, to move cars along an entire roller coaster ride.
What is kinetic energy ?"Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy."
What is potential energy ?"Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors."
Potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched. A steel ball has more potential energy raised above the ground than it has after falling to Earth.
Know more about kinetic energy here
https://brainly.com/question/12669551
#SPJ2
Why was Democritus considered a philosopher and not a scientist?
Answer:
Democritus had no scientific instruments to extend the reach of his senses, so all of his experiments were just 'mind experiments', but because Democritus was a philosopher, he thought more into depth about why we humans are alive which led to the atomic theory.
Explanation:
1. A car accelerates uniformly from 12 m/s to 39 m/s in 12 seconds. What is the car's average acceleration
2. A butterfly is flying at 4 m/s. It accelerates uniformly at 1.2 m/s for 6 seconds. How far does the butterfly travel during the period of acceleration?
Answer:
(1) 2.25m/s^2
(2) 45.6m
Explanation:
(1) A car accelerates uniformly from 12m/s to 39m/s in 12 seconds
Therefore the average acceleration can be calculated as follows
a = 39-12/12
a = 27/12
a= 2.25m/s^2
(2) A butterfly is flying at 4m/s , it accelerates uniformly at 1.2 m/s for 6 seconds
u= 4
a= 1.2
t= 6
Therefore the distance can be calculated as follows
S= ut + 1/2at^2
= 4×6 + 1/2 × 1.2 × 6^2
= 24 + 1/2 × 1.2 × 36
= 24 + 1/2 × 43.2
= 24 + 21.6
S = 45.6m
Hence the butterfly travels at 45.6m
A. What did the neuron say to the muscle say? (Use your basic physiological knowledge, such as the function of
neurons and muscles, to answer the question)
Answer:
Somatic motor neurons originate in the central nervous system, project their axons to skeletal muscles (such as the muscles of the limbs, abdominal, and intercostal muscles), which are involved in locomotion.
Explanation:
Muscles move on commands from the brain. Single nerve cells in the spinal cord, called motor neurons, are the only way the brain connects to muscles. When a motor neuron inside the spinal cord fires, an impulse goes out from it to the muscles on a long, very thin extension of that single cell called an axon.
Calculate the distance a baseball will travel if it moves at a speed of 30 m/s for 2.5 seconds.
Answer:
speed = 12 miles per second
= 12 mi/s
Explanation:
unlike other states of matter, what expand to fill their containers
Answer:
gas
Explanation:
Answer:
Person above me is big brain!
Explanation:
They are correct!
Give them some love and mark them as brainliest!
In the early 1600s, Galileo Galilei performed a series of experiments to measure the acceleration of a ball rolling down a smooth inclined plane. He tried several ways to measure time, including water clocks and his own pulse. Suppose his pulse rate was 66 beats per minute, and he counted 11 beats for the ball to roll down the plane. How many seconds was the ball rolling?
Answer: A
Explanation: ive done this already bro i just wanted to help
If you could solve one of
the world's greatest problems, which one would
you choose? Why did you choose this problem to
solve?
Answer:
the pollution
Explanation:
because is making big consecuences in the world
If I could solve one of the world's greatest problems, then I would like to choose pollution problem.
I would choose the pollution problem to be solved because it affects various natural resources of the environment.
Pollution is one the biggest issue in the world these days and It is rising day by day. It affects the environment directly or indirectly.
There are various types of pollution. Some of thees are
Water pollutionAir pollutionNoise pollution.The main cause of water pollution is various toxic substances got mixed in various water resources.
Similarly Air Pollution happens because of the harmful gases and substances present in the air.
Noise pollution occurs due to the sound of machines, loud musics and sound of vehicles.
Every human being should take steps to solve the issue of the pollution.
For more information about the pollution, follow the link given below.
https://brainly.com/question/1040743.
How long does it take an airplane to fly 1200 miles if it maintains a speed of 300 miles per hour
Answer:
The answer is
4 hrsExplanation:
To find the time taken we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
where
d is the distance covered
v is the velocity
t is the time
From the question
d = 1200 miles
v = 300 mi/hr
We have
[tex]t = \frac{1200}{300} = \frac{12}{3} \\ [/tex]
We have the final answer as
4 hrsHope this helps you
2
If the velocity of a bicycle is 10 m/s, how long will it take to cover a distance
of 18 km?
(Ans: 1800 s)
1800 sec = 30 min
Explanation:Hi there !
18km = 18×1000m = 18000 m
1 s ............... 10m
x s ...............18000m
x = 1×18000/10 = 1800 sec = 30 min
Good luck !
Natural history research involves ____ unobsevable and unrepeatable past events.
A. Interpreting B. Verifying C. Asking
please answer soon
During a race, a sprinter increases from 4.0 m/s to 6.0 m/s over a period of 1.5 s. What is the sprinter’s average acceleration during this period? (10 Points) 1 meter per second squared 1.3 meters per second 2.0 meters per second 1.3 meters per second squared
Answer:
[tex]a=1.3\ m/s^2[/tex]
Explanation:
It is given that,
Initial velocity, u = 4 m/s
Final velocity, v = 6 m/s
Time, t = 1.5 s
We need to find the average acceleration of a sprinter during this period. We know that the rate of change of velocity of an object is equal to its acceleration. So,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{(6-4)\ m/s}{1.5\ s}\\\\a=1.33\ m/s^2[/tex]
So, the acceleration of the sprinter is [tex]1.33\ m/s^2[/tex]. Hence, the correct option is (d).
What is the force of a lead ball that starts with a momentum of 7 kg*m/s and end with a momentum of 22 kg*m/s over a time of 31 seconds?
Explain how you got your answer.
Answer:
F = 0.483 N
Explanation:
Initial momentum, [tex]P_i= 7\ kg-m/s[/tex]
Final momentum, [tex]P_f= 22\ kg-m/s[/tex]
Time, t = 31 s
We need to find the force of a lead ball. We can use here the impulse momentum theorem.
[tex]\text{Change in momentum}=F\times t[/tex]
F is force
[tex]P_f-P_i=Ft\\\\F=\dfrac{P_f-P_i}{t}\\\\F=\dfrac{22-7}{31}\\\\F=0.483\ N[/tex]
So, the force is 0.483 N.
what is the definition of sewer?
Answer:
an underground conduit for carrying off drainage water and waste matter
Explanation:
Answer:
an underground conduit for carrying off drainage water and waste matter.
Explanation:
the diagram deliver of uniform mass supported at the middle point six Queens of equal mass are placed at mark 4 on on the lift hand side can you balance the liver with 12 Mor coins of equal mass if yes where where would you place them if if not why
Answer:
hmm I don’t understand
Explanation:
priyadarshini means..........
Answer:
A submission from India says the name Priyadharshini means "Beloved and pleasing to look at" and is of Sanskrit origin. According to a user from India, the name Priyadharshini is of Indian (Sanskrit) origin and means "God gift".
Compare an object sliding across carpet and that same object sliding across a bare floor. Why is the object quicker to slow down on carpet than on the bare floor?
Please answer this!
Answer:
it is friction
Explanation:
A student rode her bike to a friend’s house. She traveled 30 meters in 5 minutes and stopped one time along the way: ---------
Constant speed
Average speed
Velocity
negative acceleration
A car traveled at the same speed of 110 km/ hr around an oval track: ------------
Fill In the Blank
Answer:
1-Average speed
2-constant
Explanation:
Question 1 : You have the distance and time , need to find average speed
Question 2 : traveling at the same speed that means it's constant
I need help with these 2 questions asap please
Answer:
for number 10
I can't see what needs to be calculated for the first question though
Why is there no up and down in space
Answer:
Because there is no gravity determining where you are.
Explanation:
I hope this helps
have a good day :)
difference between basic units and derived unit
Answer:
Basic units=those units of measurement which do not depend upon any other units are called basic units. Example length, mass, time, current etc.
Derived units=those units which are expressed in terms of fundamental units are called derived units. Example area, volume, density etc.
List three ways a
a home may become more energy efficient.
Answer:
1. Installing solar panels on the roof. This is an example of renewable energy, and solar panels help provide electricity for a home.
2. Using LED lights instead of traditional lightbulbs. The modern LED lights use much less electricity and function up to 90% more efficiently than the traditional lightbulbs.
3. Using rain barrels to collect water from the roof. Installing rain barrels to collect rainwater to water your plants and garden is a great way to save water and cut down on your water bill.
Hope this helps! :)
Which of the following statements about valence electrons is false?
•Valence electrons are exposed to the nucleus of other atoms
•Valence electrons are the outermost electrons only
•Valence electrons are the only factor that determines the type and number of bonds that can form
•Valence electrons are the ONLY electrons that can form chemical bonds
Please answer ASAP!!
Answer:
valence electron are exposed to nucleus of other atom,
When do two different position-time graphs have
matching velocity-time graphs?
Answer:
when they have the same slope