Answer:
The same
Explanation:
Momentum is conserved before and after collision.
Hope this helps!
A 2 kg ball is dropped from a height of 60 m. Find its speed just before it hits the ground. Assume no friction. Answer
Answer:
-34.3m/s
Explanation:
first lets find the time befor it hit the ground by using free fall equation and we know we use that in one condition which is a constant acceleration in this case its a gravitational acceleration which is -9.8
[tex]h = \frac{1}{2} g {t}^{2} [/tex]
[tex]t = \sqrt{ \frac{2 \times 60}{9.8 } } = 3.5s[/tex]
now we know that the initial velocity its zero :
so applu the another kinematic equation which is
[tex]v = u - gt[/tex]
v is final velocity and u is the initial velocity and its equal zero.
v = - 9.8 × 3.5 = - 34.3
[tex]\huge\sf\red{A}\pink{N}\orange{S}\green{W}\blue{E}\gray{R}[/tex]
Given,
mass of the ball, m=2 kg ;
height of the ball, h=60 m
The initial potential energy of the ball,
[tex]{\boxed{\underline{\sf{E_{p}=m g h=(2)(10)(60)=1200 \mathrm{~J}}}}[/tex]
When the ball reaches the ground, its potential energy becomes zero as it is entirely converted into its kinetic energy ( [tex]{\sf{E_{K}[/tex] ), i.e.,
[tex]{\Rightarrow{\sf{E}_{\sf{k}}=1200 \mathrm{~J}}}[/tex]
If v is the velocity attained by the ball just before reaching the ground,
[tex]{\Rightarrow{\sf{E}_{\sf{k}}=\frac{1}{2}{mv}^{2}}}}[/tex]
[tex]{\sf\Rightarrow{v=\sqrt{\frac{2 \sf{E}_{\sf{k}}}{\sf{m}}}=\sqrt{\frac{2 \times 1200}{2}}}[/tex]
[tex]{\Large{\mid{\underline{\overline{\Rightarrow{\sf{34.64\:m/s}}}}\:{\mid}[/tex]
A particle with charge Q and mass M has instantaneous speed u1 when it is at a position where the electric potential is V1. At a later time, the particle has moved a distance R away to a position where the electric potential is V2. Which of the following equations can be used to find the speed u2 of the particle at the new position?
a. 1/2M(μ2^2-μ1^2)=Q (v1-v2)
b. 1/2M(μ2^2-μ1^2)^2=Q(v1-v2)
c. 1/2Mμ2^2=Qv1
d. 1/2Mμ2^2=1/4πx0 (Q^2/R)
Answer: A
Explanation:
How much acceleration is given to a 45 kg child with a 630 N push on a swing?
Hii :))
Force = mass × acceleration
630 = 45 × acceleration
630/45 = acceleration
14 m/s² = acceleration
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PLEASE HELP ME ANSWER THIS QUESTION!!!
Answer:
1. as initial speed is 0 and acceleration is g=9.8 m/s^2 velocity at any time
2. 15m
3. gravity and force
4. the flower pot would break from impact
Explanation:
Using the clues in the photo and reading the questions this should be the best answer. Good Luck!
What are some examples of objects that scatter light?
Explanation:
Sun shining hope i help you! :)
SKILL LEVEL:
Proficient
The Doppler effect is a change in the
of sound
waves that occurs wipen the source of the sound waves is
moving relative to a stationary listener.
Check it
2 SCRATCHPAD
^ Improve this question
Answer:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. Sound waves that are closer together have a higher frequency, and sound waves that are farther apart have a lower frequency.
Explanation:
hope it helps you
what are the two factors that affect the force of gravitation?
Answer:
important – mass, and distance.
Which city is known as the richest square mile on earth?.
Answer:
Central City is the county seat and the most populous municipality of Gilpin County. The city is a historic mining settlement founded in 1859 during the Pike's Peak Gold Rush and came to be known as the "Richest Square Mile on Earth".
A net force of 15 N is applied to a cart with a mass of 2.1 kg. What is the acceleration of the cart?
. Calculate the volume required for 1.2g of vaccine X which has a density of 0.785g/mL. (Show your workings
Answer:
v= 1.5286624 ml
Explanation:
d=m/v
despejar V= m/d
v= 1.2g/0.785g/ml
v=1.5286624 ml
WILL GIVE BRAINLIEST PLEASE ANSWER ALL QUESTIONS
Explain what Pulse Wave is.
Answer:
A Pulse Wave is a short, non periodic, wave formed by a single input of energy rather than a continuous or repeated input of energy.
Explanation:
A pulse wave or pulse train is a kind of non-sinusoidal waveform that includes square waves and similarly periodic but asymmetrical waves. It is a term is used in synthesizer programming, and is a typical waveform available on many synthesizers.
60 PTS + BRAINLIEST
1. A virtual image is 3 meters behind a flat mirror and it is 2 meters tall. What is the height and distance from the mirror, for the object?
2. A concave mirror has a focal length of 1 meter. An object is 2 meters from the mirror. What is the image distance from the mirror?
3. Alens has a focal length of -10 cm. If the image of an object is located at -20 cm, what is the distance of the object?
Answer:
1. The distance of image from the plane mirror is same as the distance of object (person) from the plane mirror but the image is formed behind the mirror.
v=u=3 m
Thus distance between image and the person d=u+v=3+3=6 m
2.A concave mirror has a radius of curvature of 1.0 m. An object is placed 2.0 m in front of the mirror. Can you determine the location of the image (in cm)
1/v = 1/f - 1/u = 1/50 - 1/200 = 4/200 - 1/200 = 3/200
v = 200/3 c
NUMBER 3 Ans: 18.75 cm.
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[HELPPPPP HELP ME HELP ] Current carrying conductor AB is placed in a magnetic field shown below. If the conductor AB moves away from the magnet, what will be the direction of the current in the conductor?
Answer:
B is directed from N to S (upwards at the open end)
Let the magnet be oriented with the open end at the north
F = q * v X B
A positive charge would be deflected towards the East using v X B
This is the direction of the "conventional" current which is B to A
Actual charges flow from A to B but the sign of the charge is -q
What would an acoustical engineer consider when designing a concert hall?
Answer:
Thus, to plan a classical concert hall that satisfies the acoustic performance, the acoustic design and evaluation should be conducted considering the acoustic parameters (i.e., reverberation time (RT), clarity (C80), and lateral fraction (LF)) of the classical music from the early
In design considerations, such as arched structures and ceiling, wood should be stressed to be prevent vibrations
Explanation:Hope this helps
It is dangerous to move towards the top of the branches of a tree why
[tex] \tt \: SOLUTION \leadsto[/tex]
It is dangerous to move towards the top of the branches of a tree because The exposed wood tissues begin to decay or either are too dilute. Due to which the branch can break and we can fall Down.
Answer:
Explanation:
It is dangerous to move towards the top of a tree because as we will move towards the top the branch gets thinner and thinner and we can fall down because of the breaking of the branch.
75 POINTS!!
In the experiment described in the scenario, which group represents the control group?
A.) Plant D
B.) Plant B
C.) Plant C
D.) Plant A
A. What do you think is the importance of studying Anthropology in your life as a teenager? Cite five situations happenings in your life that proved its significance and give a one sentence explanation
Your Life Situation
Significance (One-Sentence Explanation)
B. Select only five among the eight areas of concern and give a phrase or a one-sentence statement on how Anthropology is significant/beneficial to the identified areas of concern.
Areas of Concern
How Anthropology Is Significant Beneficial to this Area (phrase/sentence)
The importance of a studying anthropology to teenagers is that help them to know their roles in the society as well as teach them acceptable social behaviour.
What is anthropology?Anthropology is the scientific study of human behaviour, culture and language, both in past and present human societies.
A study of anthropology helps to educate teenagers and help them see their roles in the society as well as them acceptable social behaviour.
Area of importance of anthropology include:
Socio-cultural anthropology - educates about societies and their culturePhysical anthropology - provides a biological knowledge of people in a societyArchaeological anthropology - tells us about societies in the pastLinguistic anthropology - educates about languages of societiesPsychological Anthropology educates individuals about the behavioural patterns of societies.Learn more about anthropology at: https://brainly.com/question/13728734
A child pulls a balloon for 12m with a force of 1.0N at an angle 60 degrees below horizontal.How much work does the child do on the balloon?
Answer:
Distance for which the balloon has been pulled by the child = 12 meter
Force applied by the child to pull the balloon = 1.0 Newton
The angle below horizontal = 60 degree
These information's are already given in the question. Based on the above information's the answer to the question can be easily determined.
We know that
Work done = Force * Distance * Cos(60)
= 1 * 12 * (1/2)
= 1 * 6
= 6 Joules
So the work done by the child is 6 joules. I hope the procedure is clear enough for you to understand. Based on the above mentioned procedure, you can always solve problems of similar kind without taking any outside help.
Explanation:
A bus travels a total of 350km in 150 minutes. What was its average speed in km/h?#
Answer:
140km/hr
Explanation:
This is a simple converstion.
We know that the bus travels 350km/150min.
We want to know the speed in km/h. All we need to know is that per 1 hr there are 60 min.
350km/150min * 60min/1hr (we want to make sure that the value we are trying to eliminate, in this case the minute, is on the opposing side.)
(350*60)/150 = 21,000km/150hr
let's simplify to only per 1 hr.
21000/150 = 140
150/150 = 1
Therefore, the speed of the bus is 140km/hr
A bus travels a total of 350 km in 150 minutes, so the average speed of the bus in km/hr will be 140 km/hr.
What are Average Speed and Average Velocity?The object's average speed is how far it travels overall in a predetermined amount of time. The scalar quantity represents the average speed. It has no direction; instead, magnitude is used to describe it.
Average Speed = [tex]Total \ Distance/Total\ time[/tex]
An indicator of a vector is average velocity. Average velocity is calculated by dividing the change in position or displacement by the intervals during which it occurs. The average velocity may be positive or negative depending on how the displacement is dispersed. The standard international unit of average velocity is meters per second (m/s).
Average Velocity = [tex]Total \ Displacement/Total \ Time[/tex]
According to the question, the given values are :
Distance, d = 350 km
Time, t = 150 minutes or
t = 2.5 hours.
Average Speed = 350/2.5
Average speed = 140 km/hr
Hence, the average speed of the bus will be 140 km/hr.
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physics newton's second law projectile
What is the wavelength of the sound you hear as a train
blowing its whistle is coming towards you?
a
The wavelength is shorter than the sound of the
whistle at rest
b You will not hear anything
С
There is not enough information to answer this
question
d
The wavelength is longer than the sound of the
whistle at rest
e
The wavelength is the same as the sound of the
whistle at rest
As the train blows its whistle towards you, the wavelength is shorter than the sound of the whistle at rest.
What is wavelength?Wavelength is the distance traveled by a wave in a given period of time.
Relationship between wavelength, speed and frequency of sound
v = fλ
where;
v is the speed of the soundf is the frequency of the soundλ is the wavelength of the soundAs the frequency of the sound increases, the wavelength of the sound decreases.
Thus, as the train blows its whistle towards you, the wavelength is shorter than the sound of the whistle at rest.
Learn more about wavelength here: https://brainly.com/question/10728818
An object orbiting the sun in a circle can be said to be.
Answer:
An object orbiting the sun in a circle can be said to be. Always accelerating. :)
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A textbook with a weight of 20 N is lifted 0.7 meters from the ground. What is the work, in joules, needed?
A 1000 kg car is pushed with 400 N of force over 50 meters. What is the work, in joules, needed?
A student pushes a cart with 10 N of force for 20 meters. What is the work, in joules, needed?
Answer:
14J
20000J
200J
Explanation:
formula :W=FS
W:work done
F:force (N)
S:displacement moved in direction of force (m)
1) 20N×0.7m
=14J
2) 400N×50m
= 20000J
3) 10N×20m
=200J
Suppose you drive an average of 25 miles a day, for a total of 60 years in a lifetime. The total distance you would have covered is equivalent to going around the earth _____ times. Take the circumference of the earth as 25,000 mile
The total distance you would have covered is equivalent to going around the earth 22 times.
Total distance traveledThe total distance traveled at a given speed and time of motion is calculated as follows;
Distance = speed x time
[tex]Distance = \frac{25 \ miles}{day} \times \frac{365 \ days}{1 \ year} \times 60 \ years\\\\Distance = 547, 500 \ miles[/tex]
Distance round the EarthThe distance round the earth or circumference of the earth of the earth has been given as 25,000 miles
Number of times round the earth[tex]n = \frac{547,500}{25,000} \\\\ n = 21.9 \ times \ \approx 22 \ times[/tex]
Thus, the total distance you would have covered is equivalent to going around the earth 22 times.
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A freight train initially moving at +10m/s decelerates at a rate of -0.1m/s^2. How far does it move in 30 seconds?
Answer:
255 [m].
Explanation:
1) the formula is (d - requred distance, V₀ - initial velocity, t - elapsed time, a - deceleration):
[tex]d=V_0t+\frac{at^2}{2};[/tex]
2) according to the formula above the required distance is:
d=10*30-0.5*0.1*900=300-45=255 [m].
Apply second equation of kinematics
[tex]\\ \tt\longmapsto s=ut+\dfrac{1}{2}at^2[/tex]
[tex]\\ \tt\longmapsto s=10(30)+\dfrac{1}{2}(-0.1)(30)^2[/tex]
[tex]\\ \tt\longmapsto s=300+(-0.1)(450)[/tex]
[tex]\\ \tt\longmapsto s=300-45[/tex]
[tex]\\ \tt\longmapsto s=255m[/tex]
Where do most astronomers think the solar system formed from?.
Question:Where do most astronomers think the solar system formed from?.
Answer: Most Astronomers think the solar system formed from a Nebula
A ball is launched at 5.5 m/s at 76 degrees above the horizontal. It starts and lands at the same distance from the ground. What are the maximum height above its launch level and the flight time of the ball?
The maximum height of the ball if A ball is launched at 5.5 m/s at 76 degrees above the horizontal is 1.45 meters.
What is distance?Distance, regardless of the direction of the travel, is the entire path that an object in motion has taken. Since the direction of motion is ignored while measuring distance, it is referred to as a scalar quantity. There is only one possible value for the distance: positive.
Given:
A ball is launched at 5.5 m/s at 76 degrees above the horizontal, It starts and lands at the same distance from the ground,
Calculate the maximum height as shown below,
Maximum height = [tex]v^2sin^2a / 2g[/tex]
Maximum height = 5.5² × sin²76° / 2 × 9.8
Maximum height = 30.25 × 0.97² / 19.6
Maximum height = 30.25 × 0.9409 / 19.6
Maximum height = 28.46 / 19.6
Maximum height = 1.45 m
Thus, the maximum height is 1.45 meters.
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A stone is thrown upwards at 20m/s what is it Speed in 2s
Answer:
40
as it goes up 2second
20+20=40
A 51.7-kg hiker ascends a 43.2-meter high hill at a constant speed of 1.20 m/s. Determine the work done in climbing the hill.