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2 years ago

We dropped a golf ball from 100 cm in class. it bounced back to 60cm. why did it not return to the 100 cm mark?

1 answer:

Elena-2011 [213]2 years ago

6 0

Because the golf ball has (0 < e < 1) of elasticity therefore it did not experience the perfect elastic collision, the golf ball experienced an inelastic collision.

An elastic collision is a collision where there is no energy loss. It can be described by elasticity value. When an object has an elasticity value of 1, the speed of the object before the collision or after the collision is the same. The elasticity can be determined as

e = KEafter / KEbefore

where e is the elasticity of the object

when the object has elasticity 0 < e < 1, the object will partially lose the energy at collision.

For more on elasticity at: brainly.com/question/17879061

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a transformer changes 95 v acorss the primary to 875 V acorss the secondary. If the primmary coil has 450 turns how many turns d

natita [175]

Answer:

The number of turns in the secondary coil is 4145 turns

Explanation:

Given;

the induced emf on the primary coil, $E_p$ = 95 V

the induced emf on the secondary coil, $E_s$ = 875 V

the number of turns in the primary coil, $N_p$ = 450 turns

the number of turns in the secondary coil, $N_s$ = ?

The number of turns in the secondary coil is calculated as;

$\frac{N_p}{N_s} = \frac{E_p}{E_s}$

$N_s = \frac{N_pE_s}{E_p} \\\\N_s = \frac{450*875}{95} \\\\N_s = 4145 \ turns$

Therefore, the number of turns in the secondary coil is 4145 turns.

8 0

3 years ago

Identify statements true of Pangaea.

Romashka [77]

Answer:

option A,B and C

Explanation:

Pangaea is known as the supercontinent which existed during the late Paleozoic and early Mesozoic eras.

Later Pangaea disintegrates into large landmass. Most of the continent include the landmass of Pangaea.

Rates of seafloor spreading in the Atlantic Ocean are known about the breakup of Pangaea.

The Appalachian Mountains are remnants of Pangaea's formation.

Hence, the correct answer is option A,B and C

8 0

3 years ago

Physics 10

Dominik [7]

Answer:

Option D (N/A-m)(m)(m/s)

Explanation:

(N/A-m)(m)(m/s) is the required dimensional analysis for calculation of emi

3 0

2 years ago

When the area over which pressure is applied is increased,

Tema [17]

Answer:

A. the pressure decrease

Explanation:

pressure decreases when the surface area over which a force is applied increases. pressure increases when the surface area over which force is applied decreases.

3 0

4 years ago

the image of an object formed by a mirror is real inverted and is magnification -1. if the image is at the distance of 30 cm fro

Scorpion4ik [409]

The nature of the image is magnified , virtual , and upright.

<h3>Further explanation</h3>

We will solve this problem using following formula:

$\large{ \boxed {\frac{1}{s_o} + \frac{1}{s_i} = \frac{1}{f}}}$