2
A bank requires that its customers create a PIN to access their account. The PIN must be 2
letters followed by 2 numbers, no letter or number can be repeated. How many unique PINS
are there? *
(5 Points)
520
58500
456976
67600

Solved

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Ответ:

juelchasse

17.08.2021

Mathematics

The mass of the second object is 5.10 kg

Step-by-step explanation:

The mass of an object varies directly with the potential energy of the object,

i.e $m\propto P$

The mass of an object varies inversely with the height of the object off the ground,

i.e $m\propto \dfrac{1}{h}$

Combining the above two,

$\Rightarrow m\propto \dfrac{P}{h}$

$\Rightarrow m= k\dfrac{P}{h}$

where,

k is a proportionality constant.

A 25-kg object has 980 joules of potential energy when it is 4 meters off the ground.

Putting the values,

$\Rightarrow 25= k\times\dfrac{980}{4}$

$\Rightarrow k=\dfrac{4 \times25}{980}=\dfrac{5}{49}$

Again, another object has 150 joules of potential energy at 3 meters off the ground, so

$m= \dfrac{5}{49}\times \dfrac{150}{3}=5.10\ kg$

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2A bank requires that its customers create a PIN to access their account. The PIN must be 2letters followed by 2 numbers, no letter or number can be repeated. How many unique PINSare there? *(5 Points)5205850045697667600