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Lethal Weapons
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Fill in the Blank
100
What is the range of a cannon that fires it's cannonballs with an initial velocity of 350.0 ft/sec at an angle of 35 degrees?
3.6 x 103 ft
100
Estimate the angle of the vector shown on the map below.
Around 225o
100
In order to use the Range Equation (4.19) for a baseball, we must neglect what?
Air resistance
100
A vector is defined by a __________ and a _________ .
Magnitude and direction
200
A sharpshooter tells a nervous man to hold out a can at arm’s length. The sharpshooter realizes, however, that the nervous man will be scared at the sound of the gun and will drop the can as soon as the gun fires. In order to still hit the can, should the sharpshooter aim above, below, or straight at the can?
Directly at the can.
200
To convert a velocity vector into a displacement vector, what has to be constant?
Velocity (acceleration should be zero)
200
In which of the following situations can you use Equation (4.9), the Range Equation?
A.B.
B because the projectile lands at the same height from which it was launched.
200
A projectile’s maximum height will be reached when the y-component of its velocity is _________ .
Zero
300
How far will a bomb travel horizontally if it is dropped 9,144 m from a bomber that is traveling horizontally at a speed of 235 m/sec?
1.0 x 104 m
300
A ship travels 3.20 hours with a velocity of 21.1 mph at 123o, including the effects of the current. The pilot then turns to a heading of 190.0o with a speed of 18.2 mph, including the effects of the current. If the pilot stays on this heading for 1.10 hours, what is the ship’s final displacement from the original starting point?
77.5 miles at an angle of 136.8o
300
A baseball player makes contact with the ball at 2.5 feet above the ground, and the ball hits the ground 2.5 feet above the ground. If the velocity of the ball was 160 ft/sec when it left the bat, and the launch angle was 15o, how far did the ball travel?
4.0 x 102 ft
300
If a projectile is fired near the surface of the earth, and neglecting air resistance, it will follow a _________ path.
parabolic
400
When an archer aims at an angle of 10.0o and gives the arrow an initial velocity of 240 m/sec, how long is the arrow in the air and how far does it travel horizontally? Assume the arrow is 5.0 feet above the level ground when he shoots and that the arrow hits the ground at the end of its flight. (0.3048 m = 1 ft)
The arrow is in the air for 8.6 sec and travels 2.1 x 103 m horizontally
400
A map detailing the location of a buried treasure says to walk 525 m due west (180o) then turn to a heading of 50.0o and walk for 375 m. If you follow the instructions, what is your final displacement?
404 m at 134.7o
400
A javelin thrower sends her javelin with an initial velocity of 23.5 m/sec at an angle of 25.0o. If the distance of her throw was measured to be 45.7 m, at what height did she release the javelin?
-1.3 m (1.3 m above the ground)
400
The “range” equation relates ______, _______ and ______ .
Initial velocity, launch angle and range