Deena made a chart to summarize features of a velocity vs. time graph for objects with constant acceleration and objects with constant velocity.
Constant Velocity
the line is horizontal
find displacement using the area of the
rectangle under the line only
Constant Acceleration
the line is diagonal and straight
find displacement by subtracting the area
of the triangle from the area of the
rectangle under the line
find acceleration by finding the slope of
the line
Which best describes Deena's error?
find velocity by locating the values
plotted on the y-axis

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

trig 15.3 cos

no. dot product   =0 when vecs at right angles

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.