A 2.5 mm -diameter sphere is charged to -4.5 nC . An electron
fired directly at the sphere from far away comes to within 0.34 mm
of the surface of the target before being reflected.
Part A) What was the electron's initial speed?
Part B) At what distance from the surface of the sphere is the
electron's speed half of its initial value?
Part C) What is the acceleration of the electron at its turning
point?
A 20-cm-radius ball is uniformly charged to 62 nC .
A. What is the ball's uniform charge density (C/m3)?
B. How much charge is enclosed by spheres of radii 5, 10, and 20
cm?
C. What is the electric field strength at points 5, 10, and 20
cm from the center?
A copper wire has a diameter of 3.247 mm. What magnitude of
current flows when the drift velocity is 4.40 mm/s? Take the
density of copper to be 8.92 g/cm3. Give your answer in
Amperes.
PLEASE PLEASE PLEASE answer correctly
A 2.8 mm -diameter copper wire carries a 31 Acurrent (uniform
across its cross section).
A) Determine the magnetic field at the surface of the wire.
B) Determine the magnetic field inside the wire, 0.50 mm below
the surface.
C) Determine the magnetic field outside the wire 2.5 mm from the
surface.
A 0.500 mm diameter copper wire makes up a 136 turns, 7.60 cm
diameter coil. There is a magnetic field parallel to the axis of
the coil. If the induced current in the coil is 2.80 A, what is the
rate of change of the magnetic field? a) 0.0839 T/s b) 3.63×10-6
T/s c) 12.8 T/s d) 1.74×103 T/s
A manufacturing company is measuring the diameter of a ball
bearing in mm by 12 inspectors, each using two different kinds of
calipers to test the difference between the sample means of the two
calipers used. Data is shown below. Use excel to resolve.
a) Use t-test to check if there is a significant difference
between the means of the population of measurements from which the
two samples were selected? Use α = 0.01, 0.05, 0.1 and comment on
the...
Manufacturing Ball bearings are manufactured with a mean diameter of 6 millimeter (mm). Because of variability in the manufacturing process, the diameters of the ball bearings are approximately normally distributed with a standard deviation of 0.03 mm.
a) What proportion of ball bearings has a diameter more than 6.04 mm ?
b) Any ball bearings that have a diameter less than 5.95 mm or greater than 6.05 mm are discarded. What proportion of ball bearings will be discarded ?
c) ...