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3 years ago

Describe how the student should measure the time taken for the toy parachute to

1 answer:

4 0

The time must be measured with respect to gravity. As it falls, it has free fall that is the force acting on it will be the gravity.With the distance in account, d = 1/2 gt²

t = √(2d/g)

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What is the solar process that results in the production of energy?

AleksandrR [38]

"solar-powered photovoltaic (PVC) panels convert the suns rays into electricity by exciting electrons in silicon cells using the photons of light from the sun. This electricity can then be used to supply renewable energy to your home or business."

I hope this helps ^-^

5 0

3 years ago

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a bicyclist initially at rest speeds up steadily during this time interval she averages 3.50 miles per second determine the init

Kobotan [32]

Answer:

Explanation:

Given parameters:

Average speed = 3.5miles per second

Unknown:

Initial speed = ?

Average speed = ?

Final speed in the interval = ?

Solution:

Since the bicyclist started from rest and speeds up steadily, it is correct to assume that her starting or initial speed is 0m/s.

At a state of rest, a body has no speed.

Average speed is the sum total of the speed covered at each time interval. This value is given already to be 3.5miles per second.

Final speed is the speed before the bicycle halts. This speed will be the same as the average speed here which is 3.5miles per second.

Speed is the rate of change of distance with time.

7 0

3 years ago

A mine elevator cage with a mass of 2.5 tons empty is descending at a rate of 32 km/hr when the hoist mechanism jams and stops s

True [87]

Answer:

σ = 4.1 MPa

Explanation:

Given that

m= 2.5 kg

v= 32 km.hr

v= 8.88 m/s

The kinetic energy of the mass ,KE

KE = mv²/2

KE = 2.5 x 8.88²/2

KE= 98.56 J -------1

The strain energy of the string

$E=\dfrac{\sigma^2}{2E}AL$

$E=\dfrac{\sigma^2}{2\times 84,000\times 10^6}\times 6.5\times 10^{-4}\times 1500$

$E={\sigma^2}\times {5.80\times 10^{-12}}$ ----2

KE= E

$98.56={\sigma^2}\times {5.80\times 10^{-12}}$

$\sigma =\sqrt{\dfrac{98.56}{5.80\times 10^{-12}}}$

σ = 4.1 MPa

4 0

3 years ago

Which of these is one way that mechanical waves differ from electromagnetic waves?

Andrew [12]

<span>Mechanical waves require a medium
and electromagnetic waves do not.</span>

6 0

3 years ago

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Four students measure the mass of a standard mass that has an accepted value of 150.0 g. They post their results in a table.

Eddi Din [679]

Explanation:

This problem seeks to ensure that the student comprehends the meaning of precision and accuracy.

These two key terms are used to express how reliable experimental values obtained are.

Precision is the ability to consistently reproduce a result.
Accuracy is the nearness of the measure value to the true value.
The different between the measured and true values gives the error in the result.

In the problem given, the most accurate reading would be one that has value close to the standard mass of 150g. Any student that reports this value would be reported as accurate.

The precise reading would be for the student that is able to repeatedly produce the same kind of values. This is irrespective of whether the values are close to the true value or not.

learn more:

Statistics brainly.com/question/4401748

#learnwithBrainly

4 0

3 years ago