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a bullet 2 cm long is fired at 420 m/s and passes straight through a 10 cm thick wooden-board, penetrate at 280 m/s . (a) what is the average acceleration of the bullet through the board? (b) what is the total time that the bullet is in contact with the board? (c) what minimum thickness could the board have if it was supposed the bullet?
Use the fact that the speed of light in a vacuum is about 3.00 ✕ 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 2 hour(s)
An inelastic collision occurs in one dimension, in which a 10 kg block traveling at
5 m/s collides with a 5 kg block traveling at 3 m/s in the same direction, and they
stick together. What are the velocities of the blocks immediately after the collision?
Solve the problem below. One attachment is acceptable (a picture or a word file or a pdf file). Show your complete solution.
A spelunker is surveying a cave. She follows a passage 180 m straight west then 210 m in a direction 45 east of south, and then 280 m at 30 east of north. After a fourth unmeasured displacement, she found herself back where she started. Determine the magnitude and the direction of the fourth displacement.
a. Horizontal component of the fourth displacement.
b. Vertical component of the fourth displacement.
c. Magnitude of the fourth displacement.
d, Direction of the fourth displacement.
A 10 g bullet moving with a velocity of 500 m/s enters a stationary piece of ice mass 10 kg and stops . If the the piece of ice is lying on a frictionless plane then it's velocity will be?
A man walks on a astraight road from his house to a market 2.5 km away with a speed of 5 km/h. Finding the market closed he walks back home with a speed of 7.5 km/h. what is the magnitude of average velocity
1. When a force equal to its weight is applied to a body free to move by pushing, pulling, or lifting an object, what is its acceleration? Why? Justify your answer.
2. Can anything ever have a downward acceleration greater than ag (9.8 m/s2)? If so, how can this be accomplished? Explain your reasoning.
3. When a body is accelerated, a force is invariably acting on it. Does this mean that, when a force is applied to a body, it is invariably accelerated? Why? Explain.
Knowing that P = 120 lb and that the resultant of P and Q lies in the positive x-direction,
determine Q and the magnitude of the resultant.
