# physics

1) A rocket-driven sled running on a straight,
level track has been used to study the physiological eﬀects of large accelerations on astronauts. One such sled can attain a speed of
419 m/s in 1.6 s starting from rest.
What is the acceleration of the sled, assuming it is constant?

 sgm1996 Posts: 19, Reputation: 1 New Member #11 Oct 24, 2012, 06:30 PM
physics
014 (part 1 of 2)
A speeder passes a parked police car at 25.9
m/s. Instantaneously, the police car starts
from rest with a uniform acceleration of 2.48
m/s^2
How much time pases before the speeder is
overtaken by the police car?
015 (part 2 of 2)
How far does the speeder get before being
overtaken by the police car?
 sgm1996 Posts: 19, Reputation: 1 New Member #12 Oct 24, 2012, 06:31 PM
physics
016 (part 1 of 2)
Two particles moving along parallel paths in
the same direction pass the same point at the
same time. Particle A has an initial velocity
of 8.7 m/s and an acceleration of 1.2 m/s^2
Particle B has an initial velocity of 4.3 m/s
and an acceleration of 7.7 m/s^2
At what time will B pass A?

017 (part 2 of 2)
At what position will the faster particle
pass the slower?
 sgm1996 Posts: 19, Reputation: 1 New Member #13 Oct 24, 2012, 06:32 PM
physics
018 (part 1 of 2)
A small ﬁrst-aid kit is dropped by a rock
climber who is descending steadily at 2.1 m/s.
After 4.1 s, what is the velocity of the
ﬁrst-aid kit? The acceleration of gravity is
9.81 m/s^2

019 (part 2 of 2)
How far is the kit below the climber after the
4.1 s?
 sgm1996 Posts: 19, Reputation: 1 New Member #14 Oct 24, 2012, 06:34 PM
physics
020 (part 1 of 2)
On March 19, 1954, Colonel John P. Stapp,
USAF, attained the world speed record in
a rocket-propelled sled that moved down the
track at 632 mi/h. He and the sled were safely
brought to rest in 1.4 s.
Determine the acceleration he experienced.
021 (part 2 of 2)
How far did he travel during this deceleration?
 sgm1996 Posts: 19, Reputation: 1 New Member #15 Oct 24, 2012, 06:36 PM
physics
024
This time particle A starts from rest and accelerates to the right at 73.8 cm/s^2 Particle B starts 364 cm down the track and moves at
a constant velocity of 40.3 cm/s to the left.
When will they meet?
 Alty Posts: 25,066, Reputation: 27970 Pets Expert #16 Oct 24, 2012, 06:37 PM

We don't do homework here. You have to do the work. We can review the work you've done, and advise you where to go from there, but we won't do the work.
 J_9 Posts: 39,493, Reputation: 26710 Expert #17 Oct 24, 2012, 06:37 PM

Thank you for taking the time to copy your homework to AMHD. However, site rules prohibit us from doing your homework for you.

If you want us to help, that's fine. But you will need to show some initiative and at least try to find the answers on your own.