Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

Q: An object of mass 1 g is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s...

A: Given : m = 1 g r = 0.5 m v = 2 m/s  

Q: Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to...

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Q: Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to...

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Q: 2.0 cm 1.0 cm 'B 2.0 nC A• C

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Q: A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the...

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Q: A 4.0-N puck is traveling at 3.0 m/s. It strikes an 8.0-N puck, which is stationary. The two pucks s...

A: Given, weight of the puck, m1g = 4.0 Nm2g = 8.0 N Initial speed (before collision) u1 = 3.0 msu2 = 0...

Q: Five hoops are each pivoted at a point on the rim and allowed to swing as physical pendulums. The ma...

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Q: A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the i...

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Q: a) Find the useful power output (in W) of an elevator motor that lifts a 2300 kg load a height of 30...

A: Write the work energy theorem Work = Change of potential energy + Change in kinetic energy W = dP + ...

Q: Current Attempt in Progress The figure shows a person whose weight is W = 794 N doing push-ups. Find...

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Q: A pipe that is 0.46 m long and open at both ends vibrates in the second overtone with a frequency of...

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Q: A typical atomic nucleus is about 5x10^-15m in radius. Use the uncertainty principle to place a lowe...

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Q: Laser light is shone onto two slits separated by a distance of 8.0mm. The light is shone onto a scre...

A: two slits are  separated by a distance of ,d= 8.0 mm = 8.0 x 10-3 m The light is shone onto a screen...

Q: What are the two postulates of special relativity? (Choose two answers.) A In any closed system, the...

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Q: The refractive index of a medium can never be     a. 1   e. 1.3

A: refractive index of a medium can never be

Q: rt and carry equal but opposite charges on their facing surfaces. An electron located halfway betwee...

A: GivenDistance of separation between plates, d=8.8 mForce experienced by electron, F=8.5×10-17 N

Q: A rotating door is made from four rectangular glass panes, as shown in the figure. The mass of each ...

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Q: Electrons in a photoelectric-effect experiment emerge from an aluminum surface with a maximum KE 1.3...

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Q: 8. After two neutral solids, A and B, were rubbed together, Solid A acquired a net negative charge. ...

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Q: Given vectors: A(7,4,2), B(0,3,5) and C(8,2,2) forms a triangle. Find the unit vector in the plane o...

A: A(7,4,2),B(0,3,5),C(8,2,2) forms a triangle.  

Q: Find current I in the circuit I j4 2 -j3 N js N 30/0° V ww 10 2 -j2 2 Scanned with CamScanner rell

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Q: Sphere A has mass m and is moving with velocity v. It makes a head-on elastic collision with a stati...

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Q: 15. Please consider the following circuit (Yay! Last question of this set!). RB RA А Rc RD с— 12 V R...

A: Equivalent resistance in series R = R1 + R2 Equivalent resistance in parallel 1/R = 1/R1 + 1/R2

Q: Nhen gymnasts vault over the horse and land, they land on a big pad. How does the pad help them? hav...

A: according to Second law of motion Force applied is equal to rate of change of momentum F = dp/dt

Q: A step-up transformer has Np = 46 turns on the primary coil and Ns = 669 turns on the secondary coil...

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Q: A child is playing with a ball on a level surface. She gives the ball a push to get it rolling, then...

A: The correct option is (C)- there must have been some force on the ball opposing the direction of mot...

Q: Problem 7: You have a horizontal grindstone (a disk) that is 92 kg, has a 0.35 m radius, is turning ...

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Q: The two most prominent wavelengths in the light emitted by a hydrogen Discharge lamp are 656 nm (red...

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Q: 9. A convex mirror has a focal length of -48 cm. An object is located 24 cm in front of this mirror....

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Q: The temperature, at which the root mean square velocity of hydrogen molecules equals their escape ve...

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Q: A solid cylindrical disk has a radius of 0.10 m. It is mounted to an axle that is perpendicular to t...

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Q: A simple pendulum of length L= 2.69 m is released from rest from a position making an angle of 9° wi...

A: L = 2.69 m θi = 9oθf = 6oLet the mass = m g = 9.8 ms2  

Q: This prelab question is about the experimental setup shown in the Lab Manual as Figure 1 for Experim...

A: Tangential force is responsible for increasing or decreasing the speed of the particle while centrip...

Q: Given a set of capacitors: 7 nF, 6 nF, 5 nF, 4 µF, 3 pF and 10 µF, solve the following problems: a. ...

A: Let C1 = 7×10-9 F , C2 = 6×10-9 F , C3= 5×10-9 F  , C4 = 4×10-6 F  C5 = 3×10-12 F , C6 = 10×10-6 F 

Q: A golf club exerts an average horizontal force of 1000N on a 0.045-kg golf ball that is initially at...

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Q: A wheel has a radius of 9ft. Whats the minimum number of complete revolutions that the wheel must ma...

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Q: non flow enegy system, 1020 KJ of heat enegy is suplied to the system and 760 kJ of work transfers f...

A: We know that the  first law of thermodynamics, In the nonflow energy system, is given as  Q = ∆U+W w...

Q: If a rainstorm drops 4 cm of rain over an area of 13 km2 in the period of 3 hours, what is the momen...

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Q: The following are statements that describe Electric Potential EXCEPT: A potential energy per unit ch...

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Q: 8.3 (a) An object of mass m is suspended from the system of massless ropes as shown. Calculate the t...

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Q: Why does a rubbed inflated balloon when brought near your arm, but not touching it, causes the hairs...

A: Given : Asked why does a rubbed inflated balloon when brought near your arm, causes the hairs on you...

Q: If the electric field emitted by a radio tower has an amplitude of 285 V/m, what is the amplitude of...

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Q: 2. Use the circular orbit velocity relationship derived in 1) to calculate the orbit velocities for ...

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Q: 0. You nave a resistor Of unknown resistance, Rx. W hen the re- sistor is connected to a battery, yo...

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Q: A particle is in simple harmonic motion with period T. At time t = 0, it is at the equilibrium point...

A: Initial position of a particle in simple harmonic motion = equilibrium positionTime period = T   

Q: 1. Consider a cylindrical wire that has conduction electron density 6.0 x 1028 and radius 0.5 mm. An...

A: Given data: The conduction electron density is n=6.0×1028 1m3 The electric field strength is E=7.5x1...

Q: Ball A has a mass of 2 kg and is moving with a velocity of 4 m/s directed to the right just before i...

A: Coefficient of restitution is the ratio of velocity of separation and velocity of approach.

Q: Sphere A has mass m and is moving with velocity v. It makes a head-on elastic collision with a stati...

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Q: Problem 2: An ultracentrifuge accelerates from rest to 109800 rpm in 2.25 min. Randomized Variables ...

A: Given: The itnial angular speed is 0 rad/s. The final angular speed is 109800 rpm. The time interval...

Q: A proton moves through a magnetic field of 5.6 x 10^-3 T at a speed of 2.0 x 10^-3 m/s perpendicular...

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Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.