3 years ago

Select all numbers that are correctly rounded

Physics

1 answer:

Andreas93 [3]3 years ago

7 0

A and B i hope it helped

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Where does bacteria come from

brilliants [131]

Answer:

Fugis

Explanation:

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According to the Can Manufacturers Institute, the energy used to make an aluminum can from recycled aluminum is 5% of the energy

ololo11 [35]

Answer:

H = 109.2 TJ.

Explanation:

Please see the attachment below.

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3 years ago

Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10-7 W/m2. Another

ioda

Answer:

$6.1875\times 10^{-8}$

Explanation:

Assuming uniform spread of sound with no significant reflections or absorption. We know that sound intensity varies $I=\frac {k}{r^{2}}$ where r is the distance

Since intensity is given then when at 3 m

$1.1\times 10^{-7}= \frac {k}{3^{2}}$

$k=3^{2}\times 1.1\times 10^{-7}= 9.9\times 10^{-7}$

Since we have the constant then at 4m

Intensity, $I= \frac {9.9\times 10^{-7}}{4^{2}}=6.1875\times 10^{-8}$

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3 years ago

60m27Co → 6027Co Predict the type of radioactive emission produced from the decay of metastable cobalt-60 to cobalt-60. Describe

lara [203]

Some one already asked this question and you can copy paste and google it but I believe it is c you may want to double check

4 0

3 years ago

When 24500J of energy is supplied to a 2.0 kg block of aluminum.Its temperature rise from 20oc to 35oc.The block is well insulat

True [87]

Explanation:

Amount of heat supplied (Q) = 24500 J

Mass (m) = 2 kg

Initial temperature (t1) = 20 ° C

Final temperature (t2) = 35 ° C

Difference in temperature (dt) = t2 - t1 = ( 35 - 20) °C = 15 ° C

Now Specific heat capacity (S) = ?

We know we have the formula;

Q = m * s * dt

24500 = 2 * s * 15

24500 = 30 S

S = 24500 / 30

S = 816.67 J / Kg ° C

The specific heat capacity is 816.67 J/kg°C.

Hope it will help :)

5 0

3 years ago