![jtingley0502](/avatars/12397.jpg)
jtingley0502
21.07.2020 •
Physics
A running man has the same kinetic energy as that of a boy of half his mass. The man speed up by 2m/s and the boy changes his speed by ‘x’ m/s so that the kinetic energies of the boy and the man are equal. Then x=
Solved
Show answers
More tips
- S Style and Beauty How to Get Rid of Under Eye Bruises?...
- F Food and Cooking Is Bacon Good for You?...
- S Style and Beauty Discover the Art of Nail Design: How Do You Paint Your Nails?...
- P Philosophy How to Develop Extrasensory Abilities?...
- O Other Everything You Need to Know About Kudyabliks...
- C Computers and Internet The Twitter Phenomenon: What it is and How to Use it...
- C Computers and Internet How to Choose a Laptop: Expert Guide and Tips...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
Answers on questions: Physics
- P Physics 9. What is the age-crime curve? How does this affect sentencing? 10. What arguments were made for and against releasing these adults from sentences given in their youth?...
- P Physics Can someone pls help me with these questions pls and for 8 and 9 if u could explain the answer I would really appreciate it. I’ll give brainliest...
- P Physics 7. How many 1.00 µF capacitors must be connected in parallel to store a charge of 1.00 C with a potential of 110 V across the capacitors?...
- S Social Studies Seven months ago brandon witnessed the attack of a close friend. although this was a terrible experience, in time he was able to move on. he developed a greater appreciation...
- B Business Alexandria s dance studio is currently an all equity firm that has 60,000 shares of stock outstanding with a market price of $24 a share. the current cost of equity is 11%...
- B Business On january 2, novation corp. replaced its boiler with a more efficient one. the following information was available on that date: purchase price of new boiler $120,000 carrying...
- B Business You invest $1,000 in a complete portfolio. the complete portfolio is composed of a risky asset with an expected rate of return of 16% and a standard deviation of 20% and...
- C Computers and Technology Define a set associative cache design. a. a block of main memory may be loaded into any cache line. b. each block of main memory is mapped to exactly one cache line. c....
- B Business Question: marshall supplies is a janitorial supply store that uses perpetual inventory. on july 4, marshall purchases inventory from tidy wholesalers for $8,500 with terms...
- P Physics Earth is subject not only to the gravitational force of the moon but also to the gravitational pull of the sun. however, earth is much farther away from the sun than it...
Ответ:
The value of x is 2√2 m/s or 2.83 m/s.
Explanation:
Let the mass of the man (mm) = 2m.
Therefore, the mass of the boy (mb) = ½ mass of man = ½ × 2m = m
Let velocity of the man (vm) be v1.
Let the velocity of the boy (vb) be v2.
Let the kinetic energy of the man be Km.
Let the kinetic energy of the boy be Kb.
But the kinetic energy of the man is the same as that of the boy i.e
Km = Kb
½•mm•vm² = ½•mb•vb²
Mass of the man (mm) = 2m.
velocity of the man (vm) = v1.
Mass of the boy (mb) = m.
velocity of the boy (vb) = v2
½ × 2m × v1² = ½ × m × v2²
2v1² = v2²
Take the square root of both side
√2v1 = v2 (1)
Now, the speed of the man increased by 2 and that of the boy by x i.e
Mass of the man (mm) = 2m.
velocity of the man (vm) = v1 + 2
Mass of the boy (mb) = m.
velocity of the boy (vb) = v2 + x
Km = Kb
½•mm•vm² = ½•mb•vb²
½ × 2m × (v1 + 2)² = ½ × m × (v2 + x)²
2 (v1 + 2)² = (v2 + x)²
Take the square root of both side
√2 (v1 + 2) = (v2 + x)
Clear bracket
√2v1 + 2√2 = v2 + x (2)
From equation 1 above,
v2 = √2v1
Substituting the value of v2 into equation 2.
√2v1 + 2√2 = v2 + x
√2v1 + 2√2 = √2v1 + x
Collect like terms
√2v1 – √2v1 + 2√2 = x
2√2 = x
x = 2√2 m/s = 2.83 m/s
Therefore, the value of x is 2√2 m/s or 2.83 m/s.
Ответ:
I’m feeling super tired
Explanation:
I haven’t slept in almost 30 hours