Como Encontrar Al Lab

REVIEW PROBLEMS FOR 1ST MID TERM Physics I PHYS-131-01 1. When an object falls through air, there is a drag force that depends on the product of the surface area of the object and the square of itsvelocity, that is, Fair = C·A·v2, where C is a constant. Determine the dimensions of C. The graph shows the position of a car plotted as a function of time. At which of the times t0 to t7 is thevelocity a. negative? b. positive? c. zero? At which times is the acceleration d. negative? e. positive? f. zero?

4.

An aircraft carrier is traveling forward with a velocity v0. At the instant shown,plane at A has just taken off and has attained a forward horizontal air speed measured from still water. If the plane at B is traveling along the runway of carrier at vB in the direction shownmeasured relative to the carrier, determine velocity of A with respect to B. (49.1 km/h)

the vA, the the

2.

X(t)

v0 = 50 km/hr v A = 200 km/hr v B = 175 km/hr

θ = 15°
5. The balloon A isascending at rate v A and is being carried horizontally by the wind at v w . If a ballast bag is dropped from the balloon when the balloon is at height h, determine the time needed for it to strike theground. Assume that the bag was released from the balloon with the same velocity as the balloon. Also, with what speed does the bag strike the ground? (3.55 s; 32.0 m/s)

t0

t1

t2

t3

t4t5

t6

t7

t

3.

A baseball is struck by a bat, and 3 s later it is caught 30 m away. a) If the baseball was 1 m above the ground when it was struck and caught, what was the greatestheight it reached above the ground? (12.0 m) b) What were the horizontal and vertical components of its velocity when it was struck? (10.0 m/s; 14.7 m/s) c) What was its speed when it was caught? (17.8m/s) d) At what angle with the horizontal did it leave the bat? (55.8o)

v A = 12 km h v w = 20 km h h = 50 m g = 9.81 m/s 2

6.

A 2.00-kg aluminium block and a 6.00-kg copper block are...