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Physics Unit 8 Assignment 1

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Unit 8 Assignment 1

20. Because the magnetic force which deflects the electrons is defined by F = q * v x B (v x B is the cross product of the 2 vectors), so: The force vector would always be perpendicular to both the v and B vectors.

Since the force is perpendicular to the electron's velocity vector, and thus the path of the electrons, the work done by the field on the electrons is 0, because W = F*d*cos(theta), and theta=90 degrees, therefore cos(theta)=0, and W=0

If W = 0 then there is no change in the kinetic energy of the electrons, thus their speed remains constant; the acceleration provided by the magnetic field was used only to change the direction.
31. Well, it depends upon the Sensitivity setting of the metal …show more content…

v heavy is 1/2 v light.
33. Why is it that a cat that falls from the top of a 50-story building will hit a safety net below no faster than if it fell from the twentieth story? terminal velocity
43. A stone is shown at rest on the ground. A. the vector shows the weight of the stone. complete the vector diagram showing another vector that results in zero net force on the stone. B. what is the conventional name of the vector you have drawn?
To result in a net zero force, the other vector would have to be of the same magnitude as the one shown but in the opposite direction. The stone pushes down on the ground with a certain force and the ground pushes up on the stone with an "equal and opposite" force. the normal force vector
12. Forces of 3 N and 4 N act at right angles on a block of mass 5 kg.show that the resulting acceleration is 1 m/?
F = ma where F is force (5N) , m is mass (5kg), and a is acceleration (you have to find acceleration)

5N = (5kg)a

5=5a a=1
1m/s^2

Define angular speed (rotational speed) and tangential speed. What units are used for each?
Angular speed is radians per sec (rad/s) there are 2pi radians in 1revolution. Tangential speed is the tip speed this is measured in m/s. To find tangential speed is rad/s x

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