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kammy |
01/17/03 |
3) a tank travelling at 6 m/s east relative to the earth, fires a shell at 15m/s east 60 degrees south relative to the tank. with components, how do you find teh velocity of the shell with respect to the earth?
ans: 19 m/s (east 44 degrees south)
4) a ferris wheel is moving in a vertical circle with a constatn speed of 3.0m/s. people on the ride are a distance of 20m from the centre of rotation. the coaster turns in a clockwise manner.
a) what is the instantaneous velocity of a person when she is at a position located on the far left side of the ride?
ans: 3.0m/s up
b) what is the change in velocity as teh person moves from the far right position to the lowest position on the ride?
5) a helicopter hovering at 100m above the earth's surface (hovering is at rest relative to earth) there is a wind blowing at 5 m/s west. a small object is dropped from teh helicopter and falls to earth. due to the object's cone shape, it falls vertically with simple free fall mothion, but is pushed sideways at the velocity of the wind. how long does it take the object to reach the earth?
ans: 4.52 s
11) a 100 kg crate is acted upon by a 250 N horizontal force adn is observed to accelerate at 1.90 m/s^2. what is the magnitude of the frictional force acting on the crate?
ans: 60.0 N
12) how long would it take to lift a 12 kg bucket of water through a vertical distance of 28m starting from rest, if the tension of the rope doing the lifting was 125 N? (the bucket is not at rest when it reaches the 28m point)
ans: 9.5 s
13) what is the tension in the single cable supporting an empty 1300 kg elevator moving upwards at a constant velocity of 1.2m/s?
ans: 1.3 x 10^4N down
14) a 30 kg child standing in a moving elevator stands on a scale and has an apparent weight of 280 N. what is the acceleration (magnitude and direction) of the elevator?
ans: 0.47 m/s^2 down
15) a 20 kg wooden block is pushed across a floor by an applied force of 150 N acting at 30 degrees. the coefficient of kinetic friction between block and the floor is 0.40 calculate the magnitudes of blocks' acceleration?
ans: 1.1 m/s^2 |
Clarification/Follow-up by IQGuru on 01/17/03 4:32 pm:
Quantum Physics?
For most of these, I think not.
To receive more answers, faster:
I recommend you resubmit applicable questions, individually, each on the appropriate board;
i.e., Algebra, Trigonometry, Civil Engineering, Mechanical Engineering, Quantum Physics, etc...
In your current block form, some experts here, including me, are not going to answer further, at all.
"IQ"
Clarification/Follow-up by isizathu on 07/28/06 5:19 am:
Yup! and do your own homework!
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