If we find v = A ?, where ? is a length and v is a speed, what are the mks units for the A?
A) s-1
B) m2/s
C) m/ s2
D) s
E) kg-m/s
A
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Springs: A very light ideal spring of spring constant (force constant) 2.5 N/cm is 15 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5-kg box on a perfectly smooth horizontal floor. You observe that the box starts from rest and moves 96 cm during the first 1.6 s of its motion with constant acceleration. How long is the spring during this motion?
Fill in the blank(s) with the appropriate word(s).
A 20.0-kg box rests on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 10.0-kg box is placed on top of the 20.0-kg box, as shown in the Figure. Determine the normal force that the table exerts on the 20.0-kg box and the normal force that the 20.0-kg box exerts on the 10.0-kg box.
Which carbohydrate cannot be digested by humans as a direct source of energy?
a. Fructose b. Glucose c. Sucrose d. Cellulose e. Starch
Which of the following is a unit-vector?
A) ( - o)/t B) /x C) v cos ? D) o + t E) sin2? + cos2?