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2 years ago

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A force of 1.35 newtons is required to accelerate a book by 1.5 meters/second2 along a frictionless surface. What is the mass of

the book?
A.
0.45 kilograms
B.
0.90 kilograms
C.
1.35 kilograms
D.
1.5 kilograms
E.
1.8 kilograms

2 answers:

marysya [2.9K]2 years ago

7 0

I believe D is the right answer

malfutka [58]2 years ago

3 0

B. seems like the answer, I'm not sure.

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Maverick and goose are flying a training mission in their F-14. They are flying at an altitude of 1500 m and are traveling at 68

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Answer:

The bomb will remain in air for <u>17.5 s</u> before hitting the ground.

Explanation:

Given:

Initial vertical height is, $y_0=1500\ m$

Initial horizontal velocity is, $u_x=688\ m/s$

Initial vertical velocity is, $u_y=0(\textrm{Horizontal velocity only initially)}$

Let the time taken by the bomb to reach the ground be 't'.

So, consider the equation of motion of the bomb in the vertical direction.

The displacement of the bomb vertically is $S=y-y_0=0-1500=-1500\ m$

Acceleration in the vertical direction is due to gravity, $g=-9.8\ m/s^2$

Therefore, the displacement of the bomb is given as:

$S=u_yt+\frac{1}{2}gt^2\\-1500=0-\frac{1}{2}(9.8)(t^2)\\1500=4.9t^2\\t^2=\frac{1500}{4.9}\\t=\sqrt{\frac{1500}{4.9}}=17.5\ s$

So, the bomb will remain in air for 17.5 s before hitting the ground.

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When a particle is a distance r from the origin, its potential energy function is given by the equation U(r)=kr, where k is a co

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Distinguish between the terms strength, power, and endurance as they are used in weightlifting

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Answer:

Yes

Explanation:

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Which of the following characteristics of Earth's relationship to the Sun explains the existence of Earth's seasons? Choose all

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Answer:

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Explanation:

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Rank the following situations according to the magnitude of the impulse of the net force, from largest value to smallest value.

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Answer:

V

I and II

III and IV

Explanation:

The impulse is equal to the change in momentum of the object involved, so we can calculate the change in momentum in each situation and compare them all.

Taking always east as positive direction, and labelling

u the initial velocity

v the final velocity

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We find:

(i)

u = 25 m/s

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(II)

u = 25 m/s

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(III)

In this case,

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(IV)

F = 2000 N is the force

$\Delta t = 10 s$ is the time

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u = 25 m/s

v = -25 m/s

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So the ranking from largest to smallest is:

V

I and II

III and IV

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