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3 years ago

Isaac drop ball from height og 2.0 m, and it bounces to a height of 1.5 m what is the speed before and after the ball bounce?

Physics

1 answer:

klasskru [66]3 years ago

6 0

Explanation:

It is given that, Isaac drop ball from height of 2.0 m, and it bounces to a height of 1.5 m.

We need to find the speed before and after the ball bounce.

Let u is the initial speed of the ball when he dropped from height of 2 m. The conservation of energy holds here. So,

$\dfrac{1}{2}mu^2=mgh\\\\u=\sqrt{2gh} \\\\u=\sqrt{2\times 9.8\times 2} \\\\u=6.26\ m/s$

Let v is the final speed when it bounces to a height of 1.5 m. So,

$\dfrac{1}{2}mv^2=mgh\\\\v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 1.5} \\\\v=5.42\ m/s$

So, the speed before and after the ball bounce is 6.26 m/s and 5.42 m/s respectively.

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Describe the magnetic field when two unlike magnet poles are close together

MrMuchimi

A Magnet is an object that produces a Magnetic Field; it can be formed of a permanent magnet or an electromagnet. The word magnet comes from the Greek "magnítis líthos", which means "Magnesian Stone". Magnesia is an area in Greece (Now Manisa, Turkey) where deposits of magnetite have been discovered since antiquity.

Magnets come in many shapes but no matter what their shapes are, each magnet has a North Pole and a South Pole.

A Magnetic Field is said to exist in a region if a (Magnetic) Force can be exerted on a Magnet. Magnetic Field Lines (Flux Lines) are imaginary lines representing the direction and strength of the Magnetic Field. They go from the North Pole to the South Pole outside the Magnet, and go from the South Pole to the North Pole inside the Magnet. The density of the Magnetic Field Lines is higher near the Poles, and the Magnetic Force is stronger there.

6 0

3 years ago

Estimate the kinetic energy (in GJ) of a 98,000 metric ton aircraft carrier moving at a speed of at 32 knots. You will need to l

kiruha [24]

Answer:

K = 13.276 GJ

Explanation:

Given:

Mass of the aircraft (m) = 98,000 metric ton

Speed of the aircraft (v) = 32 knots

Kinetic energy of the aircraft (K) = ?

We know that,

1 metric ton = 1000 kg

∴ 98,000 metric ton = 98,000 × 1000 = 9.8 × 10⁷ kg

Also, 1 knot = 1 nautical mile per hour

So, 32 knots = 32 nautical miles per hour

Converting nautical miles per hour to meter per second using the following conversions, we get:

1 nautical mile = 1852 m

1 hour = 3600 s

Therefore, 1 nautical mile per hour = $\frac{1852}{3600}\ m/s$

So, 32 nautical miles per hour = $32\times \frac{1852}{3600}=16.46\ m/s$

Therefore, the mass and speed of the aircraft are:

$m=9.8\times 10^{7}\ kg\\v=16.46\ m/s$

Now, kinetic energy is given as:

$K=\frac{1}{2}mv^2$

Plug in the above values and solve for 'K'. This gives,

$K=\frac{1}{2}\times 9.8\times 10^7\times (16.46)^2\\\\K=4.9\times 270.9316\times 10^7\ J\\\\K=13.276\times 10^2\times 10^7\ J\\\\K=13.276\times 10^9\ J$

Now, we know that, 1 GJ = 10⁹ J

Therefore, the value of 'K' in terms of GJ is given as:

K = 13.276 GJ

8 0

3 years ago

Agenerator:

zzz [600]

Answer

What's the question

Explanation:

5 0

3 years ago

What characteristics determine how easily two substances change temperature? Check all that apply.

Vikki [24]

<h3><u>Answer;</u></h3>

Amount of time the two substances are in contact
Area in contact between the two substances
Specific heat of the material that makes up the substances

<h3><u>Explanation</u>;</h3>

The change in temperature of a substance is caused by heat energy. <em><u>The change in temperature will depend on factors such as mass of the substance, the type of material it is made from, the time taken , specific heat of the material that makes the substance, and also the area of contact</u></em>.
<u>The amount of time</u> the two substances are in contact affect the change in temperature such that if the two bodies are in contact for a longer time then a bigger change in temperature will be observed.
<u>Specific heat capacity </u>also determines the change in temperature that will be observed, such that a substance with a bigger specific heat capacity will record a small change in temperature.

5 0

3 years ago

Read 2 more answers

A 100 kilogram person acquires a velocity of 15 meters per second down a ski slope.What is the skier's kinetic energy?

azamat

11250J

Explanation:

Given parameters:

Mass of the person = 100kg

Velocity = 15m/s

Unknown:

Kinetic energy = ?

Solution:

The kinetic energy of a body is energy due to the motion of the body.

Kinetic energy = $\frac{1}{2}$ m v²

m is the mass of the body

v is the velocity

Substituting the parameters:

K. E = $\frac{1}{2}$ x 100 x 15² = 11250J

Learn more:

Kinetic energy brainly.com/question/6536722

#learnwithBrainly

4 0

3 years ago