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3 years ago

What is the force on a 1,000 kilogram-elevator that is falling freely under the acceleration of gravity only?

1 answer:

8 0

   Force = (mass) · (acceleration)

   = (1,000 kg) · (9.8 m/s²)

   = 9,800 newtons

Why are you still having a problem with F = M · a ?

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Please help me with #15, it’s converting units

Pavlova-9 [17]

40 km/h to in/s
60*60=3600 seconds in an hour
one km is about 0.621 miles
40 km is about 0.621*40=24.84 miles
5280 feet in a mile
12 inches on each foot
5280*12=63360 inches in a mile
63360*24.84=1573862.4 inches in 40km
40 km/h = 40*1573862.4/3600=17487.36 in/s

6 0

3 years ago

If a large housefly 2.4 m away from you makes a noise of 47.0 dB, what is the noise level (in dB) of 5400 flies at that distance

dem82 [27]

Answer:

the noise level of 5400 flies is equal to 84.32 dB

Explanation:

Noise made by house flies = 47 dB from the distance of 2.4 m

to calculate the noise of 5400 flies at a distance of 2.4 m.

the intensity of noise

$10 log_{10}(\dfrac{I}{I_0}) = 47 dB$

now, I' = 5400 I₀

= $10 log_{10}(\dfrac{5400 I}{I_0})$

= $10 [log_{10}[5400] +log_{10}(\dfrac{I}{I_0}))$

= 10 ( 3.732 + 4.7 )

= 84.32 dB

hence, the noise level of 5400 flies is equal to 84.32 dB

4 0

3 years ago

A substance of unknown mass absorbs 138 kilojoules of energy, going from 298 to 303 kelvin. if the specific heat of the substanc

AveGali [126]

Heat absorbed to raise the temperature is given by

$Q = mc\Delta T$

here

m = mass

c = 7.11 J/g C

$\Delta T = 303 - 298 = 5 kelvin$

Q = 138 KJ

Now by using the above formula we will have

$138 * 10^3 = m* 7.11 * 5$

$m = 3881 gram$

$m = 3.88 kg$

So the amount of the substance will be 3.88 kg

4 0

4 years ago

When the input work on simple machine equals the work the machine is said to be 100% efficient

Semmy [17]

Answer:

This is not a question, but a statement. The concept that the work done is equal to the input work on a simple machine is called ideal machine. An ideal machine has 100% efficiency which means that there is no loss. All the amount of input work is equal to the useful output of the machine.

Explanation:

8 0

3 years ago

What physical property makes metal pots good for cooking

bonufazy [111]

The metal conducts the heat, which makes cooking easier.

5 0

3 years ago