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3 years ago

What is the formation of a shadow?

Physics

2 answers:

katovenus [111]3 years ago

7 0

Answer:

Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow

Explanation:

patriot [66]3 years ago

4 0

Answer:

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Write down the SI unit of length and mass

Vanyuwa [196]

Answer:

The SI unit for length is meters(m), for mass is kilograms(kg)

Explanation:

hope it helps

6 0

3 years ago

A heat engine operates between a hot reservoir with a temperature of 400 K and a cold reservoir with a temperature of 300 K. The

natali 33 [55]

Answer:

Explanation:

Given

Temperature of Hot reservoir $T_1=400 K$

Temperature of Cold reservoir $T_2=300 K$

Heat reservoir $Q=500 J$

Work done $W=150 J$

heat Exhaust $Q_{rejection }=350 J$

$Q=W+Q_{rejected}$

$500=150+350$

L.H.S=R.H.S

thus it follows first law

$\eta _{carnot}=1-\frac{T_L}{T_H}$

$\eta _{carnot}=1-\frac{300}{400}$

$\eta _{carnot}=0.25$

Cycle Efficiency

$\eta =\frac{W}{Q}=\frac{150}{500}=0.3$

Carnot efficiency is less than cycle thus it violates second law

3 0

4 years ago

What is force magnifier

fredd [130]

Answer:

It is an instrument which increases the amount of force available to a single hypothetical person.

Examples;

Levers, pulleys are force magnifiers.

6 0

3 years ago

The number of oscillations that a wave completes per unit of time in called its _______.

Elena-2011 [213]

The number of oscillations that a wave completes per unit of time is called "frequency".
Frequency represents in fact how many complete cycles of the wave are done in a single unit of time. It can be written also as
 $f= \frac{Ncycles}{time}$

6 0

3 years ago

A force can change an object's direction and cause friction True or False

Gnom [1K]

Answer:

This is very true

Explanation:

The force from impact can easily change it to expanse in a different direction.

I hope this helped you very much :)

5 0

3 years ago