The vertical speed of a projectile
a. is zero
b. stays constant
c. continuously increases
d. continuously decreases
e. sometimes decreases and sometimes increases
E
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A 1.6-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 N/m
The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. What is the velocity of the block at time t = 0.40 s? A) 0.82 m/s B) -0.82 m/s C) 0.30 m/s D) -0.30 m/s E) 0.00 m/s
Two vectors 
and 
are given by 
and
style="vertical-align:middle;" src="https://sciemce.com/media/2/ppg__cognero__Chapter_9_Energy_in_Nonisolated_Systems.__media__bf8af0f8-35eb-471f-a479-9b4f159e5328.PNG" data-wiris-created="true" class="Wirisformula" align="middle" />. The scalar product of and a third vector 
is ?16. The scalar product of and is +18. The z component of is 0. What is the magnitude of ?
A. 7.8
B. 6.4
C. 3.6
D. 5.0
E. 4.8
The dedicated third wire on a 3-prong plug is connected to
A) ground. B) a fuse. C) a ground fault interrupter. D) the "hot" wire.
What is the agreed-upon direction of rotational velocity?
a. The direction the object is rotating (effectively clockwise). b. In the direction opposite to the way the object is rotating (effectively counterclockwise). c. Along the axis of rotation in the direction your thumb would point if the fingers of your left hand curl along the motion of the spinning object. d. Along the axis of rotation in the direction your thumb would point if the fingers of your right hand curl along the motion of the spinning object. e. Along the axis of rotation in the direction your index finger would point if the thumb of your right hand points along the motion of the spinning object.