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If the initial kinetic energy of the electron is 105 eV and if the electron is to stop (owing to electrostatic repulsion from the plate) just as it reaches the plate, how far from the plate must it
A lamp (R = 147 ), an electric heater (R = 26 ), and a fan (R = 52 ) are connected in parallel across a 120 V line. (a) What total current is supplied to the circuit? (b) What is the voltage across
Calculate the number of radioactive nuclei in the sample at t=0 (A0) 2. Calculate the activity of the sample after 6 minutes 3.
Bob throws a golf ball horizontally at 9 m/s off a the top of a hospital building and hears it hit the parking lot 3.2 seconds later. What was the total displacement of the ball? Total displacement
Calculate how much more CO2 emission (in g/kg/ton) we can expect per day after 5 years compared to the present emission from cars only in San Jose, while the carbon emission rate per car per day is
An electron acquires 7.95×10-16J of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates? Which plate is at t
How much work does the electric field do in moving a proton from a point with a potential of +145V to a point where it is -60V ? Express your answer in joules. then express your answer in electron
A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south. What is the charge of obj
A proton is released in a uniform electric field, and it experiences an electric force of 8.65×10-14N toward the south. What is the magnitude of the electric field? What is the direction of the
A charge of 7.65mC is placed at each corner of a square 0.230m on a side. Determine the magnitude of the force on each charge. Determine the direction of the force on each charge.
Two charged dust particles exert a force of 7.3×10-2N on each other. What will be the force if they are moved so they are only one-eighth as far apart?
They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.13 x10^-11 m. What is EPEfinal - EPEinitial, which is the change in the el
What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? Give the direction as the angle of the velocity from due north, positive if to the east and negative if to
Assume that air resistance is absent. Hint: Remember that the velocity of the jeep relative to you is zero. Thus, the horizontal component of the tire's velocity relative to you is also zero. Even i
At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 57 m horizontally and h = 54 m vertically above the launch point. At the instant it reaches its maximum
The 100kg cart B are both essentially the same value of 0.50, determine the acceleration of each part for (a) P=60N and (b) P=40N. A is on top of B.
To what temperature do you need to heat both the brass cylinder and the aluminum ring so that the ring fits over the cylinder? Please Explain.
An object carries a charge of -8.8 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object so that both objects have the
A charge +4.5 ?C is placed at the center of the hollow spherical conductor with the inner radius 3.1 cm and outer radius 5.0 cm. Suppose the conductor initially has a net charge of +9.0 ?C instead o
Give the direction as the angle of the velocity from due north, positive if to the east and negative if to the west. How long does it take for the boat to cross the river? answer number and units
A boat is traveling upstream at 19 km/h with respect to the water of a river. The water is flowing at 7.0 km/h with respect to the ground. (a) What is the speed of the boat with respect to the groun
At t1 = 1.00 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is A1=(3.00m/s^2)i +(5.00m/s^2)j At t2 = 3.00 s (less than one period later), the accelera
A dart is thrown horizontally with an initial speed of 17 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.19 s later.
In Millikan's experiment, an oil drop of radius 2.197 µm and density 0.848 g/cm3 is suspended in chamber C when a downward-pointing electric field of 1.92 105 N/C is applied. Find the charge
What is the rate at which this work is done by the electric organs during a pulse?