You bring a negatively charged object close to the top of an electroscope (without touching it), and then you briefly ground the top of the electroscope with your finger. What will be the sign of charge (if any) on the electroscope afterwards?

Q: When considering relative velocity, which of the following scenarios would result in a runner being ...

A: A tail wind is a wind that flows in the direction of travel of object . A head wind is the wind that...

Q: In an experiment, you measure and find the average of two parameters: b and c. Theory predicts a qua...

A: Given , P = 6.28*sqrt(b/c)

Q: A 68-gram superball is projected horizontally from a height of 2.3 m above a smooth table. The ball ...

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Q: Earth's orbit is nearly circular. If, however, Earth's orbit were more elongated and elliptical, wha...

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Q: A working student works at a pub during weekends. The assigned task to him is to fill drinks for cus...

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Q: Heat transfer occurs via: O Evaporation, transportation, and elevation. O Processes scientists still...

A: Heat transfer occur via: which mode

Q: A uniform, 255-N rod that is 2.00 m long carries a 225-N weight at its right end and an unknown weig...

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Q: The acceleration of a car is given by a = [ (3t^3 + 4t)i + 6tj + (8t – 5)k ] m/s^2. Determine the ma...

A: at t =0 Vx= 2 m/s Vy= 3 m/s Vz= 5 m/s

Q: 1. Three equal negative point charges -q are placed at three of the corners of a square of side d as...

A: Three negative charges  One positive charge

Q: 3. An automobile starting from rest speeds up to 12 m/s with a constant acceleration of 1.2 m/s?. Ru...

A: Total distance covered = 368m acceleration of automobile= 1.2m/s2 initial velocity =12m/s

Q: Show that the function ψ = 8e5x is an eigenfunction of the operator d/dx. What is the eigenvalue? Pr...

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Q: A ball is thrown upward at 5m/s. How much time (in seconds) will it reach its maximum height?

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Q: 1.Write the equations of the proton-proton reaction chain. See to it that the number of protons and ...

A: 1) 1H + 1H -> 2H + e- +v 2H + 1H -> 3He +y 3He + 3He -> 4He + 1H +y     

Q: The voltages V1, V2, V3, and v4 are the node voltages corresponding to nodes 1, 2, 3, and 4 in the b...

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Q: blue train leaves Central station travelling east at 15 miles per hour. Four hours later, a yellow t...

A: A blue train leaves Central station travelling east at 15 miles per hour. yellow train leaves Centra...

Q: Situation 01. Samantha has a height of 1.83 meters measured from the ground surface. She then lifts ...

A:      =4.486 m

Q: The a-t curve for a particle having rectilinear motion is shown in the figure. At t=0, the velocity ...

A: Given that:  

Q: ole A uniform beam, 2.20 m long with mass m = 25kg is mounted by a small hinge on a wall as shown. T...

A: Since the beam is in equilibrium, the net torque about the hinge is zero.  Apply equilibrium conditi...

Q: 3. The Earth moves in an almost perfectly uniform circular orbit with the Sun at its center, 1.5 x 1...

A:

Q: Why does a man with a large belly or a woman in her last trimester of pregnancy tend to lean backwar...

A: They mainly lean backward to balance their centre of mass.

Q: 2) The diagram below shows the region in the neighborhood of a large positively charged conducting p...

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Q: A 10.24 kg - box of rests on an inclined plane at an angle θ = 23.69° with the horizontal. At this a...

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Q: 4 kN y 50° 6 kN 30° 30°

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Q: Two objects with masses of m, = 3.70 kg and m, = 7.60 kg are connected by a light string that passes...

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Q: A wire of length 0.50m passes over a square magnetic field (0.75m per side) at a speed of 10m/s. The...

A: length of wire (L) = 0.50 m square over which the magnetic field is present = 0.75 m per side speed ...

Q: What are the complete forces acting on the piano? (A Weight, friction, normal force B Weight, fricti...

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Q: The radius of a typical white dwarf star is a just a little larger than the radius of Earth, but a t...

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Q: 3. To help workers in your project site move dozens of equipment weighing 60 kgs to a height of 2.2m...

A:

Q: 1. A golfer takes three putts to get his ball into the hole once he is on the green. The first putt ...

A: According to guidelines we need to solve only first question.  Given value--- first putt = 12 ft , ...

Q: If the position of a particle is defined by [2 sin (7/5)t + 4] m, wheret is in seconds, construct th...

A:

Q: In the "Fire Syringe" demonstration, what causes the cotton inside the syringe to reach a high enoug...

A: In the fire syringe demostration, which cause the cotton inside the syringe tonreach a high enough t...

Q: (a) Newton's law of universal gravitation isF-Gmima/r, where Fis a force (with dimension [F-M-L/T), ...

A: Newton's law of gravitation is, F = Gm1m2r2 dimension of the quantities, F = M.LT2m1 = m2 = Mr = L

Q: A 5.0-m-long ladder leans against a wall at a point 4.0 m above a cement floor as shown. The ladder ...

A: Taking the moment about the point of ladder touching the ground. mgx02=Fw×4mg52-422=Fw×4mg32=Fw×4Fw=...

Q: A car is accelerating uniformly as it passes two checkpoints that are 30 m apart. The time taken bet...

A: Initial velocity, u=5 m/s Distance between two checkpoint, s=30 m Time taken, t=4 s Let acceleration...

Q: 50 kg sprinter is moving around the track while exerting a vertical ground reaction force of 1500 Ne...

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Q: What are the advantages of a fusion reactor over a fission reactor? What are the practical difficult...

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Q: A small 2.05 g plastic ball that has a charge q = 1.95 C is suspended by a string that has a length ...

A:

Q: • Part A Consider the network of four resistors shown in the diagram, where R1 = 2.00 2, R2 = 5.00 2...

A:

Q: A force of magnitude 25 N directed at an angle of 54° above the horizontal moves a 12-kg crate along...

A: Given data:  Force (F) = 25 N Angle (θ) = 54°  above the horizontal Displacement (d) = 15 m Required...

Q: A 1000-kg car accelerates to the right from 0 to 30 m/sec in 10 sec. There is a friction force of 50...

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Q: Circuit 2 is shown below. How does the current through R1 compare with that through R2? What is the ...

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Q: What are the beneficial and harmful effects of EM waves?

A: What are the beneficial and harmful effects of EM waves?

Q: By definition, 10,000 K is the upper limit of the Kelvin temperature scale? O True False

A: By definition, 10000k is the upper limit of kelvin temperature scale.

Q: What advantages does the Hubble Space Telescope (HST) have over ground-based telescopes? List some d...

A: Hubble Space Telescope(HST) is an upgradable space-based telescope orbiting at nearly 600 kilometres...

Q: Two charges,5 C and 15 C are separated by some distance. Force between them is 6.75×10^13 N. What is...

A: Given data:  Two charges Q1 = 5 C and Q2 = 15 C Force (F) = 6.75×1013 N Required: Distance between c...

Q: The electron in the following figure is at a speed of 22 m/s through a magnetic field with a strengt...

A: Given: The speed of the electron is 22 m/s. The strength of the magnetic field is 1 T.  

Q: Three forces are exerted on an object placed on a tilted floor. The three forces are directed as sho...

A: Given, Forces acting on the tilted plane, F1 = 1.0 NF2 = 8.0 NF3 = 7.0 N

Q: Can the harmful effects of radiation be minimized? How?

A: Can the harmful effects of radiation be minimized?

Q: Given a set-up like that described in the figure below you measure T2 = 8N and 02 = 140° while T3 = ...

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Q: car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s....

A: