On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because   A. mercury is a metal B. density of mercury is greater than that of water C. cohesion of mercury is greater than its adhesion with glass D. cohesion of water is greater than its adhesion with glass

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A: Initial vertical height of the ball above the ground yi =y0 Final vertical height of the ball is yf=...

Q: Depending on type of coal burned, the grate has air openings in what range

A: Depending on type of coal burned, the grate has air openings in the range of 20-40 percent of the to...

Q: One end of a vertical metallic wire of length 2.8 m and diameter 2.0 mm is attached to a ceiling, an...

A: Given: The graph is as follows: Introduction: Young's modulus is the mechanical property of a mater...

Q: 12-

A: Given data, Original frequency of the ultrasound wave = 2.0 MHz Speed of the source = 26 cm/sec Spee...

Q: If a ladder weighing 250N is placed against a smooth vertical wall having a coefficient of friction ...

A: Given, Weight of ladder, W=mg=250 N Coefficient of friction between ladder and floor, μ=0.3

Q: A thin sheet of refractive index 1.25 and thickness 0.5 cm is placed in the path of light from one s...

A: As we know, the path difference introduced by the sheet = (μ – 1) t, where t is the thickness of the...

Q: Find the true statement. a) Displacement current and conduction current are never equal b) The curre...

A: B is correct

Q: A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happ...

A: Option c

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A: The 3X3 matrix which is being made is having axis coordinates, point coordinates and the force coord...

Q: Three uniform identical rigid rods of each length L are rotating around a fixed axis perpendicular t...

A:

Q: E is the energy here and h bar is the reduced plancks constant. Please specify what is theta in the...

A: In quantum mechanics, Heisenberg's uncertainty principle determines the accuracy limits of measureme...

Q: Today’s class on current and resistance is about to begin and you await your professor, who isknown ...

A: (a) For two resistance in series, Req=R+R=2R Each resistance has value of R. Therefore in the circui...

Q: A child weighing 20 kg is held in the position shown by the second child. (a) second child arms hori...

A: This is a problem based on newton's law. To solve this problem, The first step that we need to follo...

Q: Out of the following pairs, choose the pair in which the physical quantities do not have identical d...

A: Option c

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A: Ephoton=E2-E1hf=E2-E1f=E2-E1h

Q: An electron in a cathode-ray tube accelerates uniformly from 2.00 x 10^4 m/s to 6.00 x 10^6 m/s over...

A: Given, An electron in a cathode-ray tube accelerates uniformly from 2.00 x 10^4 m/s to 6.00 x 10^6 m...

Q: a part 2 please

A: Electric field The electric field is a region in space around a charge or a system of charges such t...

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A:

Q: Flag register of Z80 is also known as a) Program status register b) Program status address c) Progra...

A: Option c

Q: 120V series-wired ornamental lightbulbs, Figure 1. Suppose you have a string of 48bulbs, each one wi...

A: Given: The voltage of the circuit is V=120 V. The number of bulbs is nb=48. The resistance of each ...

Q: why is the following impossible? starting from rest, a charging rhinoceros move 50m in a straight li...

A: Given, initial speed =0m/sfinal speed =8m/sdistance =50m time =10 s

Q: A 1.0 kg object has a velocity of 5.0f m/s at t = 0. A constant resultant force of (3.0î + 4.0f ) N ...

A: Option c

Q: ‘X’ is a rectangular coil consisting of a large number of turns of copper wire wound over a soft iro...

A: A rectangular coil consisting of a large number of turns of copper-wound over a soft iron core is ca...

Q: Two beetles run across flat sand, starting at the same point. Beetle 1 runs 0.53 m due east, then 0....

A: Given: The path of the beetle 1 is from A to B to C. The path of the beetle 2 is from A to D to C.

Q: In Thevenin’s theorem Vth is __________ a) Sum of two voltage sources b) A single voltage source c) ...

A: Option b

Q: A metal parallel plate capacitor has 100mm diameter and the distance between the plates is 1mm. The ...

A: From the given data:A=pi*d2/4=0.007854m2Potential gradient = V/x = 1000*VF=epsilon*A*(V/x)2/2Substit...

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A: Angular velocity of an object moving in circle with time period T is given as  ω=2π/T  

Q: Sound waves in air are

A: Longitudinal

Q: Of the following properties of a wave, the one that is independent of the other is its   A. amplitud...

A: Option a 

Q: a- li+l2=l3+l4 b- l1=12+13+14 C- 12+13=14+lı d- 14+l2=13+l1 a The correct repetition of the current ...

A: option

Q: 12-

A:

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A: Given rate of heat transfer  for bulb, Q1= 25W for refrigerator, Q2= 50W Area of heat exchange, A= 1...

Q: Planets do not twinkle because   A. they emit light of a constant intensity B. their distance from t...

A: Correct option is

Q: Two point charges of 30 nC and -40 nC are held fixed on an x axis, at the origin and at x = 72 cm, r...

A: The magnitude of the two point charges are given as, q1 = 30 nC (or) q1 = 30×10-9 C q2 = -40 nC (or)...

Q: The Mariana Trench is located in the Pacific Ocean and has a depth ofapproximately 11,000 m. The den...

A: Given Depth (h)                             = 11,000 m The density of seawater ρ = 1025 kg/m3 Radius...

Q: A thin circular ring of mass m and radius R is rotating about its axis with a constant angular veloc...

A: By conservation of angular momentum,(m+2M)R2 ω‘=mR2 ωω‘=mω/(m+2M).

Q: A wire of length 2m and another wire of length 5m are made up of the same material and have the same...

A: Resistance is directly proportional to the length of the wire, hence as the length of the wire incre...

Q: Natural length of spring is 60 cm and its spring constant is 4000 N/m. A mass of 20 kg is hung from ...

A: In equilibrium, kx=mgx=mg/k=(20×9.8)/9000=0.049m=4.9cm

Q: According to _________________ induced emf is equal to rate of change of magnetic flux. a) Newton’s ...

A: According to Faraday law of electromagnetic induction, induced emf is equal to rate of change of mag...

Q: At one instant, the center of mass of a system of two particles is located on the x-axis at 2.0 m an...

A: Option b is correct

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A: The revolution of the earth around the sun is due to the centripetal force provided but the gravitat...

Q: Electric field inside a hollow conducting sphere ______a) Increases with distance from the center of...

A: According to Gauss’s law, if there is no charge inside a closed surface, the field inside the closed...

Q: Let A = 2 x2y3Where x= 16 ± 0.5 and y = 9 ± 0.3Please find the nominal value of A and the uncertaint...

A: Nominal Value The nominal value of a variable, also known as the absolute value of the variable, is ...

Q: A block of ice with mass 4.00 kg is initially at rest on a frictionless, horizontal surface. A worke...

A: This is a problem related to Newton's law. First, we will calculate the acceleration of the body. An...

Q: 8-

A:

Q: A 1.0 kg object has a velocity of 5.0f m/s at t = 0. A constant resultant force of (3.0î + 4.0j ) N ...

A: Option d

Q: A Lamborghini Aventador SVJ, traveling at a constant speed of 280 ms-1 passes a police car at rest o...

A:

Q: How should the permeability and number of ampere turns for good magnetic materials be? a) high perme...

A: This is a question from Electromagnetism. To solve this problem, We will need to understand the prop...

Q: Electric field is a _______ a) Scalar quantity b) Vector quantity c) Tensor quantity d) Quantity tha...

A: Vector 

Q: In type of trusses, provisions are provided for temperature expansion and contraction?a) Short roofb...

A: B)