Project #83263 - General Physics 7-8 problems, need solution and answer.

1)            For the vectors given in figure 3-33 (|A|=56.0 and θ = 53.5°), determine the following.

a)            A - B + C

Magnitude =

Direction =

b)            A + B - C

Magnitude =

Direction =

c)            C - A - B

Magnitude =

Direction =

 

2)            A park ranger driving on a back country road suddenly sees a deer “frozen” in her headlights. The ranger, who is driving at 11.5 m/s, immediately applies the brakes and slows with an acceleration of 3.70 m/s^2 ?

a)            If the deer is 90.0 meters from the ranger’s vehicle when the brakes are applied, how close does the ranger come to hitting the deer?

b)            How much time is needed for the ranger’s vehicle to stop?

 

 

3)            How long does it take a car to cross a 40.0 meter wide intersection after the light turns greens, if the car accelerates from rest at a constant 8.00 m/s^2?

 

4)            An eagle perched on a tree limb 29.5 m above the water spots a fish swimming near the surface. The eagle pushes off the from the branch and descends toward the water. By adjusting its body inflight, the eagle maintains a constant speed of 3.00 m/s at an angle of 30.0° below the horizontal.

 

a)            How long does it take for the eagle to reach the water?

b)            How far has the eagle traveled in the horizontal direction when it reaches the water?

5)            A boat moves slowly inside a marina (so as not to leave a  ) with a constant speed of 1.20 m/s. As soon as it passes the breakswater, leaving the marina, it throttles up and accelerates at 2.90 m/s^2.

a)            How fast is the boat moving after accelerating for 5.00 seconds?

b)            How far has the boat traveled in this time?

6)            A person steps off the end of a 2.00 meter high diving board and drops to the water below. How long does it takes for the person to reach the boat?

 

7)            A volcano shoots out blobs of molten lava, called lava bombs, from ground level. A geologist observing the eruption uses a stopwatch to time the flight of a particular lava bomb that is projected straight upward.

 

If the time for it rise and fall back to the ground is 7.5 seconds, and its acceleration is 9.8 m/s^2 downward, what is its initial speed?

 

8)            A speeder doing 40.0 m/h (about 17.19 m/s) in a 25 m/h zone approaches a parked police car. The instant the speeder passes the police car, the police begin their pursuit. If the speeder maintains a constant velocity, and the police car accelerates with a constant acceleration of 4.40 m/s?

 

a)            How long does it take for the police car to catch the speeder?

Subject Science
Due By (Pacific Time) 09/23/2015 09:00 am
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