horizontal displacement mg relative to the ground (hom its

launch position to its landing position) is measured. Figure 44%

gives Arm as a function of up Assume the ball lands at approch-

motely its launch height. What are the values of (a) um and (b)

way? The ball' s displacement Aza, relative to the sled can also be

measured. Assume that the sled' s velocity is net changed when

the ball is shet. What is Aza, when v, is (c) 5. mls and (d) 15 mls?

85 You are kidna d majors who are u

because u told them erotical science is net a real science .

whine of the engine), the time of travel ( mentally counting off

seconds), and the direction of travel (by turns along the -

lar street system). From these clues, you know that you are taken

along the following course: so km/ h for 2. min, tum 900 to the

right, 20 km/ h for 4. min, turn 900 to the right, 20 km/ h for 60 s,

tum 900 to the left, so km/ h for 60 s, tum 900 to the ght, 20 km/ h

for 2. min, tum 900 to the left, so km/ h for 30 s. At that point, (a)

how far are you from your starting point, and (b) in what direction

relative to your initial direction of travel are you?

In Fig. , a radar station detects an airplane approaching -

rectal from the east. At first conservation, the airplane is at distance

360 m hem the station and at angle all = 400 above the heri-

zen. The airplane is tracked through an angular change Ag = 1230

in the vertical east -west plane; its distance is then = 790 m. Find

the (a) magnitude and (b) direction of the airplane' s displacement

during this period.

t Radar dish

IE + 2. ) the particle' s I coordinate is 29 m, what

are its (a) y coordinate and (b) speed?

so At what initial speed

must the basketball player

in Fig. throw the ball, at

angle t) --550 above the

horizontal, to make the foul

shot? The horizontal dis-

dances are = 1. ft and d,

14 ft, and the heights are

7. ft addle = 10 ft.

91 During volcanic erop-

tions, chunks of solid reck

can be blasted out of the vel-

cane: these projectiles are

called volcanic bombs. Figure shows a mess section of Mt.

Fuji, in Japan. (a) At what initial speed would a bomb have to be

ejected, at angle , = to the horizontal, from the vent at A in

order to fall at the foot of the valcano at B, at vertical distance h =

3. 30 km and horizontal distance d = 9. 40 km? Ignore, fer the me-

ment, the effects of air en the boll's travel. (b) What would be the

time of flight? (c) the effect of the air increase er decrease

your answer in (a)?

Fig. - Problem 90.

Problemer.

Fig.

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