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# Physics Questions and Answers

 Mechanics | Kinematics | Dynamics 4453 3660 Electric Circuits 896 581 Other 691 604 Molecular Physics | Thermodynamics 715 542 Optics 570 396 Electromagnetism 561 395
 Astronomy | Astrophysics 235 137 Acoustics 188 95 Atomic Physics 171 97 Electrodynamics 153 111 Quantum Mechanics 164 94 Nuclear Physics 113 79
 Solid State Physics 106 76 Field Theory 45 41 Relativity 55 24 Computational Physics 15 12 Plasma Physics 12 8

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An indestructible bullet 2.00 cm long is fired straight through a board that is 10.0 cm thick. The bullet strikes the board with a speed of 460 m/s and emerges with a speed of 300 m/s. (To simplify, assume that the bullet accelerates only while the front tip is in contact with the wood.)

a) what is the average acceleration of the bullet through the board? answer m/s^2
b) What is is the total time that the bullet is in contact with the board? answer s
c)What thickness of board (calculated to 0.1 cm) would it take to stop the bullet, assuming that the acceleration through all boards is the same? answer cm
A ranger in a national park is driving at 28.0 mi/h when a deer jumps into the road 155 ft ahead of the vehicle. After a reaction time t, the ranger applies the brakes to produce an acceleration of a = -9.00 ft/s2. What is the maximum reaction time allowed if she is to avoid hitting the deer?
represent the given velocity 230km/h in the direction 2000
A ball rolls off the top of stair way with a horizontal velocity of magnitude 2 m/s.The steps are 10 cm high and 20 cm wide. if g =10 m/s^2 ,then the ball hits first the edge of which step?
A spaceship moving with an initial velocity of 58.0 meters/second experiences a uniform acceleration and attains a final velocity of 153 meters/second. What distance has the spaceship covered after 12.0 seconds?

A.

6.96 × 102 meters

B.
1.27 × 103 meters

C.
5.70 × 102 meters

D.
1.26 × 102 meters

E.
6.28 × 102 meters
Why did you use the height from the release point of the ball to the table top instead of all the way down to the floor?
 In Progress...
a 1600-kg car is traveling at 20 m/s around a curve with a radius of 120m. What is the angular momentum of the car?