2 years ago

Which TWO statements about the substances in the experiment are true?

Physics

2 answers:

nataly862011 [7]2 years ago

4 0

Answer:

A and B are correct both are correct

iris [78.8K]2 years ago

4 0

Answer:

answer A and B

A. Quartz is harder than chalk.

B. Water has a higher surface tension than salty water.

Explanation:

did the test !

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Heat transfer from a hot surface to a cool surface in direct contact is called

navik [9.2K]

This is an example of conduction

8 0

2 years ago

A car accelerates from 10.0 m/s to 30.0 m/s at a rate of 3.00 m/s2. how far does the car travel while accelerating?

Snezhnost [94]

Answer is in attachment.

3 0

2 years ago

A wave has a wavelength of 10 mm and a frequency of 4 hertz to what is it’s speed ?

nordsb [41]

Convert 10mm to metres = 0.01m

Wave speed = frequency *wavelength
= 4Hz*0.01m
= 0.04 m/s

Hope this helps

5 0

2 years ago

In doing a load of clothes, a clothes dryer uses 16 A of current at 240 V for 45 min. A personal computer, in contrast, uses 2.7

jasenka [17]

Explanation:

Given that,

Current of clothes dryer, I = 16 A

Voltage, V = 240 V

Time, t = 45 min = 2700 s

Current of personal computer, I' = 2.7 A

Voltage, V' = 120 C

Energy used by clothes dryer is given by :

$E=I^2Rt\\\\E=IVt\\\\E=16\times 240\times 2700\\E=1.03\times 10^7\ J$

Let t' is the time for this computer to "surf" the internet. Again using formula of energy used as :

$E=I'V't'\\\\t'=\dfrac{E}{I'V'}\\\\t'=\dfrac{1.03\times 10^7}{2.7\times 120}\\\\t'=31790.12\ s\\\\t'=8.83\ h$

So, for 8.83 hours you could use this computer to "surf" the internet.

6 0

2 years ago

An ideal incompressible fluid flows at 12 m/s in a horizontal pipe. If the pipe widens to twice its original radius, what is the

grandymaker [24]

Answer:

d) 3 m/s

Explanation:

As we know by equation of continuity

$A_1v_1 = A_2v_2$

here we have

$A_1 = \pi r^2$

$A_2 = \pi (2r)^2$

$A_2 = 4\pi r^2$

now from above equation we have

$\pi r^2 v_1 = 4\pi r^2 v_2$

$v_2 = \frac{v_1}{4}$

here we have

$v_1 = 12 m/s$

$v_2 = 3 m/s$

5 0

2 years ago