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Fiesta28 [93]
2 years ago
11

A ballistic pendulum is a device used to measure the speed of projectiles. It consists of a block of wood that hangs from a stri

ng. When the projectile hits the block, it causes the block to move upwards. In most devices, we measure the angle that the rope moves. In this device, we will measure the height that rises to. The mass of the block of wood is 2.50-kg and the mass of the bullet is 0.0100-kg. The block swings to a maximum height of 0.650 m above the initial position. Find the initial speed of the bullet.
Physics
1 answer:
ankoles [38]2 years ago
3 0

Answer:

u = 875 m/s

Explanation:

Let's ASSUME the bullet stays inside the block which is initially at rest.

Conservation of Energy after the collision

½(m + M)v² = (m + M)gh

v = √(2gh)

Conservation of momentum during the collision

m(u) + M(0) = (m + M)v

u = (m + M)v/m = (1 + M/m)√(2gh)

u = (1 + 2.50/0.0100)√(2(9.81)(0.650) = 875.425...

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Varvara68 [4.7K]

To solve this problem it is necessary to apply the concepts of Work. Work is understood as the force applied to travel a determined distance, in this case the height. The force in turn can be expressed by Newton's second law as the ratio between mass and gravity, as well

W = mgh

Where,

m = mass

h = height

g = Gravitational constant

When it ascends to the second floor it has traveled the energy necessary to climb a height, under this logic, until the 4 floor has traveled 3 times the height h of each of the floors therefore

h = 3h

Replacing in our equation we have to

W = mgh\\W = mg(3h)\\W = 3mgh

The correct answer is 4.

7 0
3 years ago
An object traveling at constant speed v in a circle of radius R has an acceleration am 5 m/s2. If both R and v are doubled, what
MakcuM [25]

Answer:

im pretty sure its 10 m/s but its kinda hard sorry

Explanation:

7 0
3 years ago
0.01
katen-ka-za [31]

Answer:

A

Explanation:

60 + 30 = 90

90 divided by 3 = 30

30 divided by 60 = 0.5

so your answer is 0.5 m/s

4 0
3 years ago
A car accelerates at a rate of 5ft/s/s for a time of 9 seconds. How far does the car go?
vlada-n [284]

The car will move in a speed of 45 meter per second

4 0
3 years ago
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Explain at least 3 primary and secondary online sources of data<br>​
Slav-nsk [51]

Answer And Explanation:

Primary sources of online data could be blog posts, twitter posts, and vlogs because the person producing forms of work is giving first-person account of his experience.

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Hope this is clear, and good luck with studies :)

7 0
3 years ago
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