1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nekit [7.7K]
3 years ago
10

A 0.15 kg arrow moving with an initial velocity of 30 m/s passes through a 3.0 kg block initially at rest on a frictionless surf

ace. If the final speed of the arrow is 25 m/s, what is the speed of the block?
Physics
1 answer:
Marysya12 [62]3 years ago
7 0

Answer:

.25 m/s

Explanation:

We shall use the law of conservation of momentum . We do not use law of conservation of mechanical energy because in such cases there is loss of energy.

Momentum = mass x velocity

Initial momentum of arrow and block

= .15 x 30 +0 = 4.5 J

If final velocity of block be V

Total final momentum of both arrow and block

= .15 x 25 + 3 V

= 3.75 +3V

So

3.75 + 3 V = 4.5

V = .25 m/s

You might be interested in
A horse 1 m tall running towards a tree at a constant velocity of 20m/s,
kykrilka [37]

The horse's position on the ground at time <em>t</em> is

<em>x</em> = (20 m/s) <em>t</em>

The baboon's height from the ground at time <em>t</em> is

<em>y</em> = 3 m - 1/2 <em>g</em> <em>t</em>²

where <em>g</em> = 9.80 m/s² is the magnitude of the acceleration due to gravity.

The baboon falls and lands on the horse, so that the two animals meet when the baboon's height is 2 m from the ground, which happens after

2 m = 3 m - 1/2 <em>g</em> <em>t</em>²

1/2 <em>g</em> <em>t</em>² = 1 m

<em>t</em>² = (2 m) / (9.80 m/s²)

<em>t</em> ≈ 0.452 s

In this time, the horse reaches the tree, so its distance from it is

(20 m/s) * (0.452 s) ≈ 9.04 m

7 0
4 years ago
Convert 15000km/hr into m/s
Leno4ka [110]

Answer:

4166.6667m/s

Explanation:

The hour equals 3600 secound, and Km equals to 1000 meter.

4 0
3 years ago
Read 2 more answers
Please help me this is due today
Alex_Xolod [135]

Answer:

1)   Acids have a sour taste.

Acid formulas start with "H", contain hydrogen and some react with active metals in a single replacement reaction to give off hydrogen gas.

An acid will turn blue litmus paper red

All acids are SOLUBLE in water.    

Acids have a pH below 7.

2)     Bases are bitter to taste a bitter taste is characteristic of all bases.

trong bases are very corrosive and can burn the skin.

Bases may or may not be soluble in water Bases that can dissolve in water are called alkalis

They can conduct electricity.

Bases lose their basicity when mixed with acids.

3)    i dont know how to do it on here sorry but its self explanitory!!

4)   0-3 strongly

      4-6 weakly

     7 neutral

      8-10 weakly

      11-14 strongly

hydrochloric acid

lead acid battery

gastric acid

lemon juice

cola

vinegar

orange juice and apple juice

tomato juice

beer

tea or healthy skin

acid rain

coffee

urine

milk

healthy human saliva

pure water

blood

sea water

hand soap

household ammonia

bleach

house hold lye

Explanation:

4 0
3 years ago
A kind of foliated metamorphic rock a. coal b. limestone c. marble d. slate
djyliett [7]
Limestone is a kind of Foliated Metamorphic rock.  
4 0
4 years ago
Read 2 more answers
Name the two scales that are used to measure earth intensity
nikklg [1K]

Answer:

Although several scales have been developed over the years, the two commonly used today in the United States are the moment magnitude scale, which measures magnitude (M), or size, and the Modified Mercalli scale, which measures intensity.

3 0
4 years ago
Other questions:
  • What is the approximate size of the smallest object on the earth that astronauts can resolve by eye when they are orbiting 250 k
    15·1 answer
  • What is a gravitational force? give two examples to illustrate it.
    12·2 answers
  • A ball is thrown in the air with a vertical velocity of 12 m/s.
    8·2 answers
  • 3 small identical balls have charges -3×10^-12 ,8×10^-12 and 4×10^-12 find the charge​
    6·1 answer
  • Answer if you actually have the answer unlike Miss Madhumitaa!!!!
    15·2 answers
  • Two pins attracted by a bar magnet maintain a distance between their ends why??​
    14·1 answer
  • What would be the y-component of a velocity vector that had a
    8·1 answer
  • Cuál es la diferencia entre fricción beneficiosa y perjudicial? Pon 5 ejemplos de cada uno.
    15·1 answer
  • Which dwarf planet has a moon nearly as large as itself?
    12·1 answer
  • Calculate the initial speed of a box which slides on a horizontal floor surface and comes to rest after sliding 2 s. The coeffic
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!