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A uniform electric field of magnitude 380 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 2.60 cm.
(a) What is the work done by the field on the electron? J
(b) What is the change in potential energy associated with the electron? J
(c) What is the velocity of the electron? magnitude m/s direction +x,-x,+y-y
A jumper in the long-jump goes into the jump with a speed of 12m/s at an angle of 20 deg above the horizontal. How long is the jumper in the air
3 charges (q1=2q, q2 = 3q, q3=-q ) where q = 1c , are arranged to form an equilateral triangle that is 10 cm on a side. What is the electric feild in the middle
A helium-filled balloon contains n = 1.1 moles of helium atoms at room temperature and a pressure P = 2 ? Patm (twice atmospheric pressure). How many moles are in the balloon
A spring whose stiffness is 1000 N/m has a relaxed length of 0.49 m. what is the change in the potential energy of the spring
How many kilograms of water at 100 degrees Celsius can be converted to steam by the addition of 1.13X10^7 joules of thermal energy.
An equipotential line surrounds a charge distribution of known value (35 mC). Two points A and B are selected on this equipotential line separated by 3.0 cm. What is the potential difference DV between these points
A textbook of mass 2.10kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.190m, What is the tension in the part of the cord attached to the book
A circular loop in the plane of the screen lies in a 0.60 T magnetic field pointing into the screen. The loop's diameter changes from 18.5 cm to 6.0 cm in 0.50 s.
A string is wrapped around a disk of mass m = 1.7 kg and radius R = 0.08 m. Starting from rest, you pull the string with a constant force F = 7 N along a nearly frictionless surface. At the instant while the center of the disk has moved a distance..
Two balls are released simultaneously from the top of a tall building. Ball A simply dropped with no initial velocity, and Ball B is thrown downward with and initial velocity of 12 m/s. How far has each ball dropped
one of your classmate has a friend with a boat. here is your classmate on water-skis being towed. in the absence of friction your classmate (m=62kg) would accelerate at 2.23m/s^2.
A 2.40-g bullet embeds itself in a 1.30-kg block, which is attached to a spring of force constant 740N/m, Find the time for the bullet-block system to come to rest
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