3 years ago

Astronomy can best be described as a/an

1 answer:

3 0

Astronomy can best be described as a/an . A. study of objects beyond earths atmosphere", although the subject of astronomy can be much more complicated

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What is the displacement of an object that moves from the origin to a position at - 12m

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d = 12m

Displacement is defined as change in the position of the object it is the shortest distance between initial and final position of the object

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When using science to investigate physical phenomena, which of the following is NOT a characteristic of the event must exist?

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It’s not Measurable.

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A ball is tossed upwards into the air with an initial upwards velocity of 3.0m/s. What is the ball's velocity when it returns to

krek1111 [17]

Same as initial velocity.
Acceleration due to gravity is 9.8m/s^2

Which is constant on the whole way of travel of the ball.

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For a huge luxury liner to move with constant velocity, its engines need to supply a forward thrust of 7.45 105 N. What is the m

ehidna [41]

Answer:

7.45 10^5N.

Explanation:

according to newtons second law of motion;

$\sum F_x = ma_x\\F_{app} - F_r = ma_x$

Fapp is the applied force

Fr is the resistive force

m is the mass of the luxury

a is the acceleration

Since the huge luxury liner move with constant velocity, then acceleration is zero i.e a = 0. The equation becomes;

$F_{app} - F_f = m(0)\\F_{app} - F_f =0\\F_{app} = F_f$

This shows that the applied force will be equal to the resistive force if the velocity is constant.

Given Fr = 7.45 10^5 N therefore the resistive force will also be 7.45 10^5N.

Hence the magnitude of the resistive force exerted by the water on the cruise ship is 7.45 10^5N.

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6. The potential energy of a freely falling object decreases

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Answer:

Explanation:

As the potential energy of the freely falling object decreases, its kinetic energy increases on account of an increase in its velocity. ... Thus, the law of conservation of energy is not violated.

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