Physics
posted by Katie
Mutiple choice:
A car travelling at 10 m/s accelerates at 3 m/s^2. Its new velocity is
A.) 12 m/s B.) 22m/s C.) 17 m/s D.) Can not be determined.
Which of the following is not acceleration?
A.) rate of change of speed in a particular direction B.) rate of change of motion in a particular direction. C.) rate of change of velocity D.) rate of change of displacement
An object will weigh least on
A.) Jupiter B.) Pluto C.) Earth D.) Saturn
On a graph of distance verse elasped time, the slope of the tangent to the curve at any single point is
A.) average speed B.) constant speed C.) variable speed D.) instantenous speed
An object is accelerated from the rest of a rate at 2 m/s^2. At the end of 8 seconds, the magnitude of the velocity is
A.) 2.0 m/s B) 6.0 m/s C.) 8.0 m/s D.) 16 m/s
After a body has fallen freely from rest to 4.0 seconds, its velocity is apporoximentaly
A) 20 m/s B) 40 m/s C.) 60 m/s D.)80 m/s
A force with a magnitude of 100 newtons acts at a 30 degree angle from the horizon. The "X" component of this force is
a) 87 newtons B) 50 newtons C) it is at rest D) its motion is changed
An object is not considered to be in a state if equilibrium if
A) it is not moving at constant speed in a straight line B) there is an unbalanced force acting on the body
C) It is at rest D) its motion is unchanged

Henry
1D. Cannot be determined, because we don't know the time.
2D.
5D.V = a*t = 2m/s^2 * 8s. = 16 m/s.
6B. V = Vo + g*t = 0 + 10*4 = 40 m/s.
7A. X = 100*cos 30 = 87 N.
8B.
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