The upward force exerted by a fluid on an object immersed in it is called
a. gravitational force.
b. atmospheric force.
c. buoyant force.
d. weight.
e. none of the above.
c
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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is positive. The sphere is
A. rotating clockwise and slowing down. B. rotating counterclockwise and slowing down. C. rotating clockwise and speeding up. D. rotating counterclockwise and speeding up. E. first rotating counterclockwise and then clockwise.
When heat and pressure are applied to a sedimentary rock it turns into
A) a metamorphic rock B) a meteorite C) another sedimentary rock D) an igneous rock
A projectile is launched with an initial velocity of 80 m/s at 30° above the horizontal. Neglecting air resistance, what is horizontal component of the projectile's acceleration?
A) 40 m/s2 B) 0 m/s2 C) 69 m/s2 D) 9.8 m/s2 E) 80 m/s2
Batteries able to withstand only 200 recharge-discharge cycles are unsuitable for commercial use
What will be an ideal response?