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3 years ago

5. He slept for eight hours. This sentence has

Physics

2 answers:

Galina-37 [17]3 years ago

7 0

Answer:

an object (it's English

Alisiya [41]3 years ago

6 0

An object ( it’s english )

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Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg. A horizont

vfiekz [6]

Answer:

2.75 N

Explanation:

Given that,

Box A has a mass 21.0 kg and box B has a mass 8.0 kg.

A horizontal force of 100N is exerted on box A.

Let a be the acceleration of the system. Using second law of motion,

$F=(m_A+m_B)a\\\\a=\dfrac{F}{(m_A+m_B)}\\\\a=\dfrac{10}{(21+8)}\\\\a=0.344\ m/s^2$

Now applying Newton's second law to box B. So,

$F_A=m_Ba\\\\=8\times 0.344\\\\=2.75\ N$

So, 2.75 N is the force that box A exerts on box B.

8 0

3 years ago

The loudness of a sound will be determined by its

adoni [48]

Answer:

By its amplitude.

Explanation:

loudness is sound intensity & intensity depends on square of amplitude. for example higher the amplitude higher the intensity which means higher the loudness.

4 0

3 years ago

What is Newton's third law of motion? In what way could this law connect to the idea of conserving momentum?

Pachacha [2.7K]

Answer: The third law states that for every action (force) in nature there is an equal and opposite reaction.

Explanation:

if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Notice that the forces are exerted on different objects.

Hope this helps you! Have a good day! ^-^

6 0

3 years ago

A square coil, enclosing an area with sides 3.2 cm long, is wrapped with 2,720 turns of wire. A uniform magnetic field perpendic

marishachu [46]

Answer

$\epsilon = -0.74\ V$

Explanation:

given,

Side of square coil = 3.2 cm

Number of turns = 2720

magnetic field in the coil increases to = 0.45 T

time interval = 1.7 s

average induced voltage in the coil = ?

length = 0.032 m

Area = 0.032² = 0.001024 m²

induced voltage

$\epsilon = -NA \dfrac{dB}{dt}$

$\epsilon = -2720 \times 0.001024 \times \dfrac{0.45}{1.7}$

$\epsilon = -0.74\ V$

The average voltage induced in the coil is equal to $\epsilon = -0.74\ V$

3 0

3 years ago

In complete agreement

valkas [14]

Answer:

umm.....

Explanation:

8 0

3 years ago