Momentum practice problems
use your knowledge about solving equations to work out the following problems. be
sure to show all your work with units:
1. if the truck has a mass of 2,000 kilograms, what is its momentum? (v = 35 m/s)
express your answer in kg: m/sec.
2. if the car has a mass of 1,000 kilograms, what is its momentum? (v = 35 m/s)
3. an 8-kilogram bowling ball is rolling in a straight line toward you. if its momentum is 16
kg. m/sec, how fast is it traveling?
4. a beach ball is rolling in a straight line toward you at a speed of 0.5 m/sec. its
momentum is 0.25 kg. m/sec. what is the mass of the beach ball?
5. a 4.000-kilogram truck travels in a straight line at 10.0 m/sec. what is its momentum?
6. a 1,400-kilogram car is also traveling in a straight line. its momentum is equal to that
of the truck in the previous question. what is the velocity of the car?

1. 70000 kg. m/s

2. 35000 kg. m/s

3. 2 m/s

4. 0.5 kg

5. 40 kg. m/s

6. 0.03 m/s

Explanation:

1. p = mv

p =?

m = 2000kg

v = 35 m/s

p = 2000 × 35

p = 70000 kg.m/s

2. p = mv

p =?

m = 1000kg

v = 35m/s

p = 1000 × 35

p = 35000kg.m/s

3. p = mv

p = 16kg.m/s

m = 8kg

v = ?

16 = 8 × v

divide both sides by 8

16      =         8 × v

__                

8                     8

2       = v

v   = 2m/s

4.  p =mv

p = 0.25kg.m/s

m = ?

v = 0.5m/s

0.25 = m × 0.5

divide both sides by 0.5

0.25     =      m × 0.5

___              

0.5                     0.5

0.5   = m

m = 0.5kg.

5. p = mv

p = ?

m = 4kg

v = 10m/s

p = 4 × 10

p = 40kg.m/s

6. p =mv

using momentum from previous question as specified

p = 40kg.m/s

m = 1400kg

v = ?

40 = 1400 × v

divide both sides by 1400

40         =        1400 × v

1400                  1400

0.03 = v

v = 0.03m/s.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

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