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4 years ago

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book?

Physics

2 answers:

padilas [110]4 years ago

7 0

Answer:

The forces on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.

Monica [59]4 years ago

7 0

Answer:

The answer is D

The forces on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.

Explanation:

An object at rest has balanced forces acting upon it, since there is no change in movement. These forces always include gravity (on the Earth), but does not include friction, since the book is not moving. The table holds the book up with an upward force that is opposite gravity.

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A 41.0 kg child is riding a playground merry-go-round that is rotating at 60.0 rev/min. What centripetal force (in N) is exerted

Tatiana [17]

Answer:505.94 N

Explanation:

Given

mass of child (m)=41 kg

N=60 rpm

$\omega =\frac{2\pi N}{60}=4\pi rad/s$

Radius(r)=1.25 m

and centripetal acceleration is given by $m\omega ^2r$

$F_c=41\times (4\pi )^2\times 1.25=505.94 N$

3 0

4 years ago

If engine oil gets into the brake fluid, which of the following will happen? A. Rubber seals will swell. B. Everything should op

wlad13 [49]

The answers are A and D.

Engine oil reacts with rubber, changing its properties and causing it to expand. This will compromise rubber seals in the brake system and lead to a failure.

4 0

3 years ago

Read 2 more answers

A constant amount of charge passes through a conductor. How is current affected if the same amount of charge passes in less time

baherus [9]

Answer:

B. The current increases.

Explanation:

As we know that rate of flow of charge through the conductor is known as electric current

So we have

$i = \frac{q}{t}$

here we know that charge Q flowing through the conductor is constant while the time in which it passes through it is decreased

so we can say that the ratio of charge and time will increase

so here we have

$i = increased$

So correct answer will be

B. The current increases.

4 0

4 years ago

What should a sailboat operator do when approaching a PWC head-on

nekit [7.7K]

In accordance with the International Regulation for the prevention of collisions at sea:

1.- A sailing boat has a passing preference over a motorized boat, except when the motor boat is limited by its draft.

2.- The sailboat must maintain its course and speed.

3.- If it is evident that the PWC does not respond, the sailboat must sound the warning signal, and change its course to starboard.

4.- All actions must be taken as soon as possible.

5.- If a sailboat is using its engine, the situation changes, and in that case, both ships must alter to starboard.

8 0

3 years ago

Vector A, with magnitude 28.0 units, points in the positive y-direction. Vector A + B has a magnitude of 19.0 units and points i

Leokris [45]

<h2>Answer:</h2>

|B| = 47.0 units

<h2>Explanation:</h2>

The sum of two vectors (A) and (B) gives another vector (A + B). i.e

(A + B) = (A) + (B) ----------------(i)

From the question;

Vector A = 28.0 units in the positive y-direction. This means that the value of the x-component is zero and the value of the y-component is +28

In unit vector notation vector A is given as;

A = 0i + 28.0j

Vector A + B = 19.0 units in the negative y-direction. This means that the value of the x-component is zero and the value of the y-component is -19.0

In unit vector notation, vector A + B is given as;

A + B = 0i - 19.0j

To get the magnitude of vector B, make B the subject of the formula in equation (i) as follows;

(B) = (A + B) - (A) ------------------ (ii)

Substitute the values of the vectors (A) and (A + B) into equation (ii) as follows;

(B) = (0i - 19.0j) - (0i + 28.0j)

(B) = - 19.0j - 28.0j

(B) = - 47.0j

The magnitude of B, |B|, is therefore;

|B| = |-47.0|

|B| = 47.0 units

8 0

4 years ago