# Project #39970 - homework

Ann and carol are driving their cars along the same straight road . carol is located at x=2.4 mi at t=0 h and drives at a steady 36 mph. Ann who is traveling in the same direction , is located at x=0.0mi at t=0.50h and drives at steady 50 mph.

a.       At what time does ANN overtake Carol ?

b.      What is their position at this instant ?

c.       Draw a position-versus-time  graph showing the motion of  both Ann and Carol.

A 200 kg weather  rocket is loaded with 00kg of fuel and fired straight p. it accelerates upward at 30m/s square for 30s, then runs out of fuel. Ignore any air resistance effects.

a.       What is the rocket’s maximum altitude?

b.      How long is the rocket in the air before hitting the ground ?

c.       Draw a velocity-versus-time graph for the rocket from liftoff until it hits the ground .

A motorist drives along a straight road at a constant speed of 15.0 m/s. A parked motorcycle police officer

notices her speeding. 1 second after the motorist passes him, the police officer begins accelerating at 2.00

m/s2 in an effort to overtake her. Assuming that the officer maintains this acceleration,

a)Determinethetraveltimeittakesthepoliceofficertoreachthemotorist.Howlong(time)hasthe

motoristtraveledfor?(10)

b)Findthespeedanddisplacementoftheofficerwhenhereachesthemotorist.(4)

c)Drawthevelocitytimegraphofthemotoristandthepoliceofficerinthesamegraph.(4)

d)Drawthedistance-timegraphofthemotoristandthepoliceofficer inthesamegraph.(4)

e)Howmanysecondsafterthepoliceofficerstartsisthedistancebetweentheofficerandthe

motoristthemaximum?(Doesthewordmaximumringabell?)

5. Solve the problem first using the variables given and then the numerical quantities. A rock is thrown up with

an initial speed of ï¿½! = 26 ï¿½/ï¿½. The object hits the ground ï¿½! = 7.5 seconds later.

A. How much higher or lower is the launch point relative to the point where the rock hits the ground.

B. Find the maximum height reached by the rock (relative to its bottom most point in the trajectory)

C. What is the velocity when it hits the ground?

D. Draw the acceleration-vs time, velocity vs time position vs. time graph

 Subject Science Due By (Pacific Time) 09/22/2014 12:00 am
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