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3 years ago

3. Imagine a 10kg block moving with a speed of 20m/s calculate the kinetic energy of this block

1 answer:

6 0

The formula of the kinetic energy is:
$E_{k} = \frac{m v^{2} }{2}$
where m is a mass of the object, v is speed of the object at the moment of time. So we have:
$E_{k} = \frac{10* 20^{2} }{2} = 2000J$
The answer is 2000 Joules.

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Which element is found in group 17 and period 2

exis [7]

The answer is fluorine

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2 years ago

What is the distance in m between lines on a diffraction grating that produces a second-order maximum for 775-nm red light at an

8090 [49]

Answer:

The distance is $d = 1.747 *10^{-6} \ m$

Explanation:

From the question we are told that

The order of maximum diffraction is m = 2

The wavelength is $\lambda = 775 nm = 775 * 10^{-9} \ m$

The angle is $\theta = 62.5^o$

Generally the condition for constructive interference for diffraction grating is mathematically represented as

$dsin \theta = m * \lambda$

where d is the distance between the lines on a diffraction grating

$d = \frac{m * \lambda }{sin (\theta )}$

substituting values

$d = \frac{2 * 775 *1^{-9} }{sin ( 62.5 )}$

$d = 1.747 *10^{-6} \ m$

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2 years ago

Calculate the time (in seconds) needed for a car to accelerating from 0 m/s to 10 m/s at 5 m/s^2?

bazaltina [42]

Answer: 2 s

Explanation: In order to solve this problem we have to use the formule of the final speed getting with a constant acceleration, it is given by;

Vfinal=Vo+a*t where Vo is zero.

so then t=Vfinal/a = (10 m/s)/5 m/s^2= 2 s

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3 years ago

What can you do to lower your carbon footprint?

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Food

Consume local and seasonal products (forget strawberries in winter)

Limit meat consumption, especially beef

Select fish from sustainable fishing

Bring reusable shopping bags and avoid products with excessive plastic packaging

Make sure to buy only what you need, to avoid waste

Clothing

Take good care of your clothes

Try swapping, borrowing, renting or buying second-hand

Buy responsibly-made clothes, e.g. made from recycled material or with an eco-label

Transport

Cycle or use public transport

Be smart about when and how you drive

Try the train for your next holiday

Energy and waste

Turn down the heating by 1°, it will already make a difference

Take short showers

Turn off the water while you brush your teeth or clean the dishes

Unplug your electronic equipment and don’t leave your phone on charge when the battery is already full

Select energy efficient products with an “A” label (EU Energy Label)

Limit and recycle your waste

7 0

2 years ago

Read 2 more answers

When a charged particle moves perpendicularly to a uniform magnetic field, what best describes its trajectory

Ronch [10]

Answer:

A circle.

Explanation:

When a charged particle moves perpendicularly to a uniform magnetic field, what best describes its trajectory is a circle.

This ultimately implies that, a charged particle moving perpendicularly to a uniform magnetic field would undergo or experience a uniform circular motion and this simply, describes its trajectory.

Additionally, the frequency would be directly proportional to the mass of the charged particle.

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3 years ago