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3 years ago

A bird has a mass of 0.8 kg and flies at a speed of 11.2 m/s. How much kinetic energy does the bird have?

2 answers:

riadik2000 [5.3K]3 years ago

7 0

The kinetic energy of an object is directly proportional to its mass and the square of its velocity

KE = 1/2 (mv²)

KE = Kinetic Energy
m = mass in kg
v = velocity in m/s

Given:

m = .8 kg
v = 11.2 m/s

Substitute:

KE = 1/2 (.8)(11.2²)
KE = 50.18 J

scZoUnD [109]3 years ago

5 0

Answer:

50.2 like the other dude said

Explanation:

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1 year ago

A sample of ore containing radioactive strontium 38Sr90 has an activity of 8.2 × 105 Bq. The atomic mass of strontium is 89.908

ahrayia [7]

From the activity values and the decay constant, the mass of of Strontium in the sample is:

$1.62 × 10^{-7}g$

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{λ = ln 2 / t1/2

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The half-life is converted to seconds since the decay constant is asked in per seconds.

$28.8 years = 28.8 × 3.156 × 10^{7} = 908928000 s \\$

Hence;

$λ = \frac{ln2}{90892800s} = 7.626 s^{-1}$

The activity of the element, A, the decay constant, λ and the number of nuclei, N are related as follows:

A = (–) λN

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$m = 1.082 × 10^{15} × \frac{90 g}{6.02 × 10^{23}} = 1.62 × 10^{-7}g \\$

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2 years ago

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3 years ago

Read 2 more answers

A lever has a 36cm input arm and a 6cm output arm. find MA.

Nady [450]

Explanation:

The mechanical advantage is a factor that measures how input force increases using a machine.

A lever is a simple machine with the fulcrum at the center.

To calculate the mechanical advantage M.A of levers we use the expression below;

M. A = $\frac{F_{b} }{F_{a} }$ = $\frac{a}{b}$