<span> Using conservation of energy

Potential Energy (Before) = Kinetic Energy (After)

mgh = 0.5mv^2

divide both sides by m

gh = 0.5v^2

h = (0.5V^2)/g

h = (0.5*2.2^2)/9.81

h = 0.25m

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4 0

3 years ago

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"A 75 kg swimmer dives horizontally off a 500 kg raft. If the diver's speed immediately after leaving the raft is 4 m/s, what is

svet-max [94.6K]

Answer:

0.6 m/s

Explanation:

Let the raft speed be v.

Given:

Mass of the swimmer (m) = 75 kg

Mass of the raft (M) = 500 kg

Speed of swimmer after leaving the raft (u) = 4 m/s

Now, the given situation can be considered a problem of conservation of total momentum before and after collision.

Momentum is the product of mass and velocity.

Here, the swimmer and raft are the bodies in collision.

So, before the collision, both the bodies were at rest. So, initial momentum is 0. Now, from conservation of momentum, the final momentum of the system must be 0 after the collision. Therefore,

Final Momentum = 0

$mu+Mv=0\\\\Mv=-mu\\\\v=-\dfrac{mu}{M}$

Plug in the given values and solve for 'v'. This gives,

$v=-\frac{75\times 4}{500}\\\\v=-\frac{300}{500}=-0.6\ m/s$

The final velocity of the raft is -0.6 m/s. Now, speed is the magnitude of velocity.

Therefore, the corresponding raft speed is 0.6 m/s.

7 0

4 years ago

Meteoroids are small objects in space, usually made of rock or metal. These bodies often get close to a planet and fall through

ser-zykov [4K]

Answer:

1. A burning streak of light, called a Meteor.

2.The rocky bodies that survives the fall to the planet’s surface are Meteorites.

Explanation:

Let us see the difference between them.

Asteroids: They are the remnants of a broken planet orbiting the sun in between Mars and Saturn. They are small rocky bodies from a tennis ball size to larger ones weighing a few tones.
Meteoroids: They are the small rocky objects of pebble size formed due to the collision of asteroids.
Meteors: These are pebble size objects that enter Earth's atmosphere and burns off by forming streaks of light.
Meteorites: These are rocky objects bigger than meteors than don't burn out completely and fall on the earth's surface.
Comets: These are objects mainly made of dust and ice that orbit the sun in a highly elliptical orbit. This composition makes a long tail when approaching the sun.

4 0

3 years ago

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Place thermometers near the edge of the table for easy retrieval.

Maurinko [17]

This is a true and false question correct or did you accidentally put two truths ??

7 0

4 years ago