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3 years ago

You hold your physics textbook in your hand. (Assume that no other objects are in contact with the book.)

Physics

1 answer:

horrorfan [7]3 years ago

5 0

Answer:

Hand on book

Earth on book

Explanation:

Since we are holding the book so the forces that acts on the book is

1. Hand on book

this is the contact force between hand and the book

2. Earth on book

here this is the gravitational attraction force of earth on the book

Answer:

A. book on hand - NA

B. hand on book - upwards

C. floor on book - NA

D. earth on book - downwards

Explanation:

Since book is holding in hand so at equilibrium position we can say that the forces on the book must be in equilibrium

so first of all the force of attraction due to earth on the book is downwards and this is counterbalanced by the force of hand on book which is upwards.

Answer:

A. book on hand

Explanation:

As per Newton's III law we know that every action has equal and opposite reaction.

so if our hand apply the force on the book in upward direction then book will apply same magnitude force on the hand in downward direction.

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Suppose the earth is shaped as a sphere with radius 4,0004,000 miles and suppose it rotates once every 24 hours. How many miles

Alenkinab [10]

Answer:

1047 miles

Explanation:

The radius of the Earth is

$r = 4000$ (miles)

So its circumference, which is the total length of the equator, is given by

$L=2\pi r= 2\pi(4000)=25133 mi$

Now we know that the Earth rotates once every 24 hours. So the distance through which the equator moves in one hour is equal to its total length divided by the number of hours, 24:

$L' = \frac{25133 mi}{24h}=1047 mi$

8 0

3 years ago

Which subatomic particle can be absent from an atom?

Alika [10]

Neutron can be absent

5 0

3 years ago

The atoms in a sidewalk on a hot summer day are vibrating _____ the atoms in the sidewalk on a freezing day in winter.

Karolina [17]

Answer:

(A) more rapidly than

Explanation:

With higher temperatures, object's molecules (and atoms) have higher kinetic energy which is due to faster "jiggling" (vibrations). On a hot day these vibrations in the material the sidewalk is made of are more rapid than on a cold day, just as their temperatures differ.

7 0

3 years ago

Read 2 more answers

f the absolute pressure in a tank is 128 kPa , determine the pressure head in mm of mercury. The atmospheric pressure is 100 kPa

White raven [17]

Answer:

211 mmHg

Explanation:

Absolute Pressure = Gauge Pressure + Atmospheric pressure

128 = Gauge Pressure + 100

Gauge Pressure = 28 KPa = 28 × 10³ Pa

Also Gauge Pressure = ρgh

ρ = density = 13550 kg/m³

g = acceleration due to gravity = 9.8 m/s²

h = pressure head = ?

28 × 10³ = 13550 × 9.8 × h

h = 28000/(13550 × 9.8)

h = 0.211 m = 211 mm

5 0

3 years ago

Cindy exerts a force of 40 newtons and moves a chair 6 meters. Her brother Andy pushes a different chair for 6 meters while exer

klasskru [66]

Work formula:
W = F * d
F 1 = 40 N, d 1 = 6 m;
F 2 = 30 N; d 2 = 6 m.
W ( Cindy ) = 40 * 6 = 240 Nm
W ( Andy ) = 30 * 6 = 180 Nm
The difference of their amounts if work:
240 Nm - 180 Nm = 60 nm

hope it helps!

3 0

3 years ago