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3 years ago

An 8.0-newton wooden block slides across a

1 answer:

7 0

If the block is sliding at constant velocity then its speed is constant. That means it is not losing any kinetic energy. There is no friction acting and the coefficient of kinetic friction is zero. Sadly, that choice of answer is not offered.

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Suppose one night the radius of the earth doubled but its mass stayed the same. What would be an approximate new value for the f

Alex17521 [72]

Answer:

g' = g/4

Explanation:

The value of the free-fall acceleration at the surface of the earth, can be obtained applying Newton's 2nd law, assuming that the only force acting on an object at the surface of the earth, is the one produced by the mass of the Earth, i.e. gravity.
This force can be expressed according the Newton's Universal Law of Gravitation , as follows:

$F_{g} = G*\frac{m_{x} *m_{E} }{r_{E}^{2} } (1)$

From Newton's 2nd Law, we have:
$F = m* a (2)$
Since the left sides in (1) and (2) are equal each other, both right sides must be equal each other also.
Simplifying the mass m, we can write the acceleration a in (2) as the acceleration due to gravity, g, as follows:

$g = G*\frac{m_{E} }{r_{E}^{2} } (3)$

Since G is an universal constant, and the mass mE remains constant, if we double the radius of the Earth, the new value for the acceleration due to gravity (let's call it g'), is as follows:

$g' = G*\frac{m_{E} }{(2r_{E})^{2} } =G*\frac{m_{E} }{4*r_{E}^{2} } = g*\frac{1}{4} =\frac{g}{4} (4)$

4 0

3 years ago

Which of the following summarizes cellular respiration?

3241004551 [841]

The statement which summarizes cellular respiration is Oxygen reacts with glucose to produce carbon dioxide and water, and release energy.

<h3>What is cellular respiration?</h3>

Cellular respiration is the process by which food, in the form of glucose is transformed into energy within cells.

The food is prepared by the plants by the process of photosynthesis in presence of sunlight. This food is in the form of glucose.

The respiration of plants is done by breaking of glucose by absorbing oxygen. This produces carbon- di- oxide and water along with the release of energy.

Thus, the cellular respiration is oxygen reacts with glucose to produce carbon dioxide and water, and release energy.

Learn more about cellular respiration.

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6 0

3 years ago

A rock with a mass of 25 kg has a weight of 40.8 n on the moon. what is the value of the acceleration of gravity (g) on the moon

zaharov [31]

Mass m = 25 Kg; Force = Weight = mg Force = ma but a = g

F = 40.8 N

Required: gravity g = ?

F = mg

g = F/m

g = 40.8 N/25 Kg

g = 1.6 m/s²

7 0

4 years ago

WILL GIVE BRAINLIEST!!

Ganezh [65]

Potential Energy
Potential energy is the energy an object has because of its position to move. Gravitational potential energy can be calculated by multiplying the mass of an object, the gravitational pull, and the height of the object together. In our project the weights, cups, marbles and dominos all have a potential energy as well as other objects.

Kinetic Energy
Kinetic energy is energy due to motion. To calculate this, use the equation KE=0.5mv^2. The work, potential energy, and kinetic energy of an object will always be equal to eat other. Kinetic energy can be calculated by any objects in motion on the machine, such as the marbles, car, and the dominos.

SRY I HAVE ONLY THIS MUCH OF INFORMATION ABOUT THIS............I ONLY HOPE THAT THIS WILL HELP YOU MATE.......

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3 years ago

If you are behind other vehicles, use low beams when you are within __________ feet of the vehicle ahead.

PilotLPTM [1.2K]

300 Hope this helps :)

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3 years ago