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24kmphExplanation:AVERAGE SPEED will be,2v1v2/(v1+v2)=2×20×30/(20+30)=24kmph

a CONTROLLING of the CAREER of the ALIMENTARY from the slope FREE and the 13

4.45 m/sExplanation:PLZ FOLLOW memark as BRAINLEST

Actually at FIRST you need to make TRY yourself and after we can help you

d)has no dimensionsExplanation:a UNIT LESS QUANTITY NEVER has a DIMENSION

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Frequency of blue light, The wavelength of blue light in glass, Explanation:It is given that,Wavelength of blue light in air, If f is the frequency of the blue light. It is given by :If the REFRACTIVE index of glass for blue light is, N = 1.55Let is the wavelength of blue light in glass. The refractive index of any material in terms of wavelength is given by :HENCE, this is the required solution.Learn more,Refractive indexbrainly.in/question/6542415

8Explanation:

NORTH.......Explanation:dhek Bhai me TUJE explain nahi karsaktha PER tu ake compass le aur check Kar CORRECT aye tho MUJ follow Kar .......

भू-संपर्क तार हरे रंग के विद्युत् रोधी आवरण से ढ़की रहने वाली वह सुरक्षा तार है जो घर के निकट भूमि के भीतर बहुत गहराई में दबी धातु की प्लेट से संयोजित रहती है और अल्प प्रतिरोध का चालन पथ प्रस्तुत करती है। इससे यह सुनिश्चित होता है कि साधित्र के धात्विक आवरण में विद्युत् धारा का कोई क्षरण होने पर उस साधित्र का विभव भूमि के विभव के बराबर हो जाएगा (यानी शून्य) और इसे इस्तेमाल कर रहा व्यक्ति तीव्र विद्युत् आघात से बच जाएगा।

tion:I don't know but I can SAY that VELOCITY is equal to DISPLACEMENT by TIME

time=5 secand impulse = 3 kgm/s in opposite direction of motion.Explanation:When it STOPS the FINAL VELOCITY is zero so apply v=u+at(u=12m/s,v=0),Also impulse=mv-mu(that is change in MOMENTUM).

2v1v2v1+v2Explanation:Average speed =TOTAL distance travelled Total TIME takenlet the distance between a and b be D.From a to b , t1= D T2= D v1 v2So, total distance travelled = D+DTotal time = t1 + t2==> 2D. (D/v1 +D/v2)==>. 2v1v2 v1+v2

When the river STARTS flowing at 4 KILOMETRE per hour then the boat WOULD TAKE One hours to travel 8 kilometre down in the riverExplanation:See the pic...

The horizontal range after the collision is ( eu²sin2θ ) / g. Explanation:GIVEN data: a ball is thrown with an initial horizontal velocity “u” with an angle “θ” with the horizontal ground. The horizontal range of the ball is given as “R” and the coefficient of restitution as “e”. Shown in fig.1 below. To find: the horizontal range “r” after the collision of the ball with the ground. After the collision of the ball with the ground, the horizontal component of the velocity ALONG the ground remains the same as “ucosθ” and the vertical component velocity reverses and becomes as “usinθ”. Now, the ball will CONTINUE to make a projectile motion, as shown in fig.2 below, so, the vertical component of velocity will BECOME “e” times. Since, e = | (v2-v1) / (u1-u2) |                   = |v1/u1| …….. [∵ v2=u2=0] Or, v1 = e u1 ∴ The vertical component, v = e usinθ The time to fligh at the highest point during the motion be “t”. ∴ v = u + at Or, v = u – gt ……..[ ∵ acceleration is acting downwards] also, final velocity at the highest point will be zero. ∴ 0 = u – gt Or, u = gt Or, e usinθ = gt …… [ we are taking the vertical component of the velocity] Or, t = (e usinθ) / g  ∴ Total Time of flight, T = 2 t = (2 e usinθ) / g ……(i) Therefore, the horizontal range after the collision will be r = ucosθ * T or, r = ucosθ * (2 e usinθ) / g or, r = ( 2 e ucosθ usinθ) / g or, r = ( e u² sin2θ ) / g …. [∵ 2 cosθsinθ = sin2θ]

90mExplanation:V=u+atPut v 0 a=g u=30You GET in 3 s the particle attains max heightA/c to QN v=30m per secondIn 1 second =30 meterIn 3 second=90 meter

2.5 ampExplanation:EQUIVALENT RESISTANCE of WHEAT STONE BRIDGE= 5ohmtotal resistance=5+5= 10ohmcurrent=voltage/resistance=25/10=2.5A

velocity of SOUND depends on PRESSURE and density .Establish the RELATION

Examples of Day-to-Day Energy TRANSFORMATIONS Chemical Energy is converted to Electrical Energy (stove), KINETIC Energy (car), Electricity (power PLANT), and Mechanical Energy (SPACE SHUTTLE).

zeroExplanation:In case of UNIFORM motion acceleration is 0. So as FORCE is proportional to acceleration. So ACTING force is ZERO.

567995334789887554443332! EXPLANATION:

tion:I THINK the path followed by CHARGE is UNIFORM circular pathThank you

pth/n is FORMULA for APPARENT SHIFT

hrome wire Explanation: If CURRENT flowing through a conductor is directly proportional to the VOLTAGE applied then that conductor is known as Ohmic conductor. In other words, we can say that the conductors whose RESISTANCE remains constant are called ohmic conductors. Nichrome wire does not change its resistance with the change in current and voltage. So, (D) is the RIGHT answer.

and 5G are used almost SYNONYMOUSLY, but there are key differences between the two. The mmWave technology is just one part of what future 5G networks will USE. The term mmWave refers to a specific part of the radio frequency spectrum between 24GHz and 100GHz, which have a very short wavelength. Electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as RF shielding. The shielding can reduce the coupling of radio waves, electromagnetic FIELDS, and electrostatic fields. A conductive enclosure used to block electrostatic fields is also known as a Faraday cage.

the CORRECT ANSWER will be 2

usin60*=U root3/2**********