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123 are correct answer please like my answer

For same range.. the angles of projectile should be complimentary to each other

so, ∅+2∅ = 90=> 3∅ = 90or ∅ = 90/3 = 30°

option B

2) is correct answer

3) is the correct answer

in which solid phase change in to liquid phase..so a is the right answers.

Melting is the process in which solid state changes into liquid state .

liquid phase is the correct answer for ur question

R=R1+R2+R3 is the correct answer of the given question

R=R1+R2+R3 is the law of combination of resistance s in the series

Ans :- लम्बाई की एक मापन इकाई है।

Solution:Non - coplanar concurrent forces

Explanation:In non - coplanar concurrent forces, all forces do not lie in the same plane, but their line of action passes through a single point.

Net upward force in pulling the engine up (f) = mg sinθ+ frictional forcewhere m is the mass of the body = 500×100 = 50000 kgg is the acceleration due to gravity.sinθ= 1/100frictional force = 2000 NOn substituting the value , we getf = 51000N​power = force . distance/ time = force . velocitypower = 51000 . 10 = 510000 watt = 5.1×10^5watt

answer is 510KW

The accommodation reflex (or accommodation-convergence reflex) is a reflex action of the eye, in response to focusing on a near object, then looking at a distant object (and vice versa), comprising coordinated changes in vergence, lens shape and pupilsize (accommodation).

Assume left string has tension = T1 and right string has tension = T2. the force balance equation along y axis is T1cos30+T2cos45 = 4*10 N => T1√3/2 +T2/√2 = 40 and along x axis , it is T1sin30 = T2/√2 => T1 = √2(T2)..... putting this in above equation.

we get √3(T2)/√2 +(T2)/√2 = 40 => T2*(√3+1)/√2 = 40 => T2 = 40√2/(√3+1) N

Given :

Force =F=10NDisplacement =S=30cm=30/100=0.3mWorkdone =?

Formula to be used:

Workdone =Force X displacement =10x0.3 =3N-m or Joules

∴Workdone is 3 joules

3 joules is the right answer

workdone=F*D10*0.3=3joule

Work done is 3 Joule

Work done is 3 J W=F×s =10N×0.3m =3J

Romeo's love was more intense and passionate as he even entered Juliet's house and even fought with his cousin.

In ammonium phosphate, the NH4 is enclosed in parenthesis. The sum of the atoms within the parenthesis is five. The number three after the closed parenthesis indicates a total of three ammonium groups within the compound. Since each group hasfive atomsmultiplyingthreegroups byfive atomsproduces15 atoms

c is correct answer , 60

B) is correct answer

c) is the right answer of the following

As the sensationof soundpersists in our brainforabout 0.1 s,to hear a distinct echo the time interval betweentheoriginal soundand thereflectedone must be at least 0.1s.hence option d

thanks😁😂😀

We replaceaproportionality signwith an equalsignand aconstantbecause thatisthe meaning ofproportional. Two variable quantitiesare proportionalif oneisalways obtainable from the other by multiplying by aconstantvalue.

Let the distance between A and B be x Speed ¹ = 50kmph therefore time taken = x/50

return journey speed ²=40kmphtime taken = x/40

total distance travelled =x+x=2x kmdisplacement =0average speed = total distance/total time= 2x/(x/50+x/40)= 2x÷[ x(40+50)/200]= 2*200/90= 45 kmph

The magnetic pull of the earth

I = 10 sin(314t) the avg value is the rms value that is 10/√2 = 7.07option B

Dimensional variablesare those physical quantities which havedimensionsof the form [M^a L^b T^c]… {where,M,L,T are fundamental physical quantities which are Mass,Length and Time respectively. And a,b,c are any real numbers} … but arevariables.

Sunita Williams, a native of Needham, has traveled far beyond Massachusetts as part of her work as an astronaut at the International Space Station. She served as the commander of the space station in 2012, and has spent a total 322 days in space. She also has spent more than 50 hours on space walks alone.

In this 2004 photo provided by NASA, astronaut Sunita Williams poses for a photo. (NASA via AP)

She is featured in the new documentary film "The Mars Generation," which looks at a new generation of teenagers who are preparing to go to Marsin this century.

"The Mars Generation" is playing at theWoods Hole Film Festivalon Sunday at 5 p.m. Williams will also be speaking on a panel about science and storytelling on Sunday at 2 p.m.

Guests

Sunita Williams, American astronaut and former commander of the International Space Station. She tweetsAstro_Suni.

Interview Highlights

On her path to becoming an astronautIt was a little bit of a happenstance, and a lot of good luck, and a lot of perseverance. I wanted to be a veterinarian, and go to school in Boston. It didn't quite work out that way, and I ended up joining the Navy as a suggestion of my big brother. It was really awesome, and I didn't realize it at the time, but provided a lot of leadership and followership teamwork opportunities. And it led me down the path to become a helicopter pilot and a test pilot. It was the shoe in the door to making me understand that, hey — things are possible. And I got down to NASA at Johnson Space Center and realized that I could do the things those guys were doing, like anybody can when they have that opportunity and take it.

On her time as a commander on the International Space StationIt was awesome. A huge responsibility. But just like in the movie "The Martian," you take it one step at a time. You don't look at the big problem all together, because I think it's a little intimidating. So you just take it one day at a time, meet the people who are going to meet with you, for you, and who you're going to work for, and really try to do the best job that you can. That's all teamwork, and that's what space travel is about.

On what it's like to do a spacewalkIt's a little scary at times, when it's just your visor between you and the outside, not-so-nice area of space where there's no air to breathe — a vacuum that's really hot, and really cold. So that's scary. But you take it one step at a time. You have a lot of things to do when you're out on a space walk, and that sort of overwhelms your mind. You're like, "I've got to get this test done, and this test done." But you can't help every now and then stopping, and looking at where you are, and watching the world whiz by you — and just going, "Whoah! But — never mind — just keep working, just keep working." It is an incredible view, an incredible place to work, and it's the culmination of a huge team of people making it work for the astronauts who are just out there doing their jobs.

On what her time in space has taught her about the challenges facing potential Mars astronautsYou are away from home, and you do miss your family and your friends, and of course I missed my dog. But you have the ability to call home, and the ability to video conference on the weekends. We're close to Earth, and we only have about a half-second of delay when we're talking. But when you take that trip and are going to Mars, you're going to have a long delay. You're not going to be able to have those instant conversations. You're going to need to know how to fix things without calling home to ask how to do it. So there's going to be a lot of different challenges for that crew, and that crew needs to know that they'll be gone for a long time. I knew I would be gone for 6 months, and maybe a little bit more. [People going to Mars] need to go into this knowing that you might be gone for a year and a half or so. You're not going to be able to text to your friends and family like people are used to doing here. It's going to take a little while to get that communication back and forth.

Ans :-

Ans :- Sodium is a veryreactivemetal. It is kept in kerosene to prevent it from coming in contact withoxygenand moisture. If this happens, it will react with the moisture present in air and formsodium hydroxide. This is a stronglyexothermicreaction, and lot of heat is generated.

1)Sound travels the fastest in solids like iron,steeletc. Sound is slower in liquids and slowest in gases. That implies that sound travels fast in a denser medium that is more the density of a medium more is thespeed of soundin that medium.

Sound is nothing more than a local disturbance whose propagation is facilitated by the collisions between particles; this disturbance propagates in a logitudnal wave; imagine one molecule hitting the next molecule, and then that molecule hitting the next, and so forth.

The distances between molecules in solids are very small, i.e., solids are more dense - as compared to liquids and gases. Because they are so close, than can collide very quickly, i.e. it takes less time for a molecule of the solid to 'bump' into its neighborough. Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids. The distances in liquids are shorter than in gases, but longer than in solids. Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.

2)Mass of football < Mass of basketballTherefore Weight of football < Weight of Basketball

Hence friction faced byfootball < friction faced by basketballSo, to overcome the greater friction, more force is required.

Given:

The refractive index of diamond, μ = 2.47 ----------------------(1)

that of glass, μ' = 1.51 -----------------------(2)

Asrefractive index = c/v

c be the velocity of light in vacuum while v is the velocity of light in that medium

Taking the ratio:

μ/μ' = v'/v = 2.47/1.51 = 1.636

=> v' = 1.636 times v

ie velocity in glass medium = 1.636 times the velocity of the light in diamond

T = s/vt = 5.6×10^25/3×10^8t = 1.866×10^17.

In the electrolysis of CuSO4, oxygen is liberated at anode and copper is deposited at cathode.

W= F . Sso ( 3i + 2j) . ( 2i-3j) W = 6 -6 = 0

Two inexhaustible resources - Solar energy and Wind energy

air and water is the answer

Change in direction of light by a mirror is known as reflection of light.

the change of direction of light by a plane mirror is known as reflection of light

Ans :- Attenuation is a telecommunications term that refers to a reduction in signal strength commonly occurring while transmitting analog or digital signals over long distances. Attenuation occurs with any type of signal, whether digital or analog. The extent of attenuation is usually expressed in units called decibels (dBs).

Attenuation can relate to both hard-wired connections and to wireless transmissions. There are many instances of attenuation in telecommunications and digital network circuitry. Inherent attenuation can be caused by a number of signaling issues including:

Transmission medium - All electrical signals transmitted down electrical conductors cause an electromagnetic field around the transmission. This field causes energy loss down the cable and gets worse depending upon the frequency and length of the cable run. Losses due to

Crosstalk from adjacent cabling causes attenuation in copper or other conductive metal cabling.

Conductors and connectors - Attenuation can occur as a signal passes across different conductive mediums and mated connector surfaces.

Different types of attenuation include:

Deliberate attenuation can occur for example where a volume control is used to lower the sound level on consumer electronics.

Automatic attenuation is a common feature of televisions and other audio equipment to prevent sound distortion by automatic level sensing that triggers attenuation circuits.

Environmental attenuation relates to signal power loss due to the transmission medium, whether that be wireless, copper wired or fiber optic connected.

Indirect current(DC), the electric charge (current) only flows in one direction. Electric charge inalternating current(AC), on the other hand, changes direction periodically. Thevoltagein AC circuits also periodically reverses because thecurrentchanges direction.In India, as the frequency is 50Hz hence it changes The AC produced in India has a frequency of 50Hz.Coil is rotated at the rate of 50 revolutions per second. Since in one revolution of coil, the current reverses its direction 2 times , So in 50 revolutions of coil the current reverses its direction 2 x 50 = 100 Times.

Thus AC supply in India reverses its direction 100 Times in one second.

The frequencyof ACinIndia is50 Hz and in each cycle it altersdirectiontwice. ThereforeAC changes direction2 x 50 = 100timesinone second

Focal length of convex lens f = 12 cmImage distance v = 48 cmObject distance u = ?

Lens formula:1/f = 1/v - 1/u1/u = 1/v - 1/f = 1/48 - 1/12 = -1/16 u = -16 cmThe object should be placed at a distance of 16 cm from the lens to obtain an image at 48 cm on the other side of the lens.

Rate of liquid flow =(1/2*m*v^2)/tRate of flow =m/tRate of flow=dV/tRate of flow=dAL/t1/2* d*A*v *v^21/2 *dAv^3

thanks

mass - kglength -mtime - secelectric current - Atemperature - Kluminosity - Candelaamount of substance - mole