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a boy is sitting on a swing is suspended motionless. (his feet are not touching the ground). The swing seat is supported by two ropes attached to the branch of a tree.
The potential difference between two parallel plates of a condenser which are 4 mm apart is 800 V. (a) What is the potential gradient? (b) What is the force on a proton which is midway between the plates?
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Using a zero reference potential at infinity, determine the amount by which a point charge of 8 x 10-8 alter the electric potential at point 1.5 m away where the charge is (a) positive and (b) negative.
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Find the number of particles each carrying the charge of an electron that passes between the terminals of a 12-V car battery when a 60-W headlight is on for one hour.
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Two metallic plates are separated by a distance of 0.030 m at a potential difference of 60 V. Between the equipotential surfaces, there is a potential difference of 3.0 V. Find the spacing in this part of the field between the two metal plates.
The source of electrons at a point is at the middle to two large metal plates 2 cm apart. One of the metal plates is maintained at 2 400 V above the other. Find (a) the potential gradient at the source measured at right angle to the plates and (b) the potential gradient at the source measured along a line to a point 15 cm from one plate.
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Four point charges are placed at the four corners of a square that is 30 cm on each side. Find the potential at the center of the square if two of the four charges are +2μC and the other two are -2μC.
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Two spherical obejcts have masses of 3.2 ×10^6 kg and 6.5×10^4 kg.The gravitational attraction between them is 75 N.How far apart are their centers?
A force applied to an object of mass m1 produces an acceleration of 2.00 m/s square.
(A) what is the ratio m1/m2
(B) if m1 and m2 are combined,find their acceleration under the action bof the force F
A spacecraft is moving relative to the earth. An observer on the earth finds that, between 1 P.M and 2 P.M. according to her clock, 3601 s elapse on the spacecraft’s clock. What is the space craft’s speed relative to the earth?
#332078 on Oct 2022