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2 years ago

9

What inferences can you make about the melting points of the different substances and the motion of their particles, based on th

e data?

1 answer:

miv72 [106K]2 years ago

7 0

Here’s the answer now hand over the brainilyiest

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A stone is thrown downward with a velocity of 30.0 m/s from a cliff. if the height of the cliff is 100m, what velocity does it h

lana [24]

Use v^2=u^2+2as
v^2=900+2000
v=(2900)^(1/2)

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3 years ago

A truck covers 40 km with an average speed of 80km/h. Then it travels another 40 km with an average speed of 40 km/h. The averag

Yuliya22 [10]

Answer:

Average speed = 53.33 km/h

Explanation:

Below is the calculation for the average speed:

Given the average speed of for first 40 km = 80km/h

Time taken to cover the first 40 km = Total Distance / average speed

Time taken to cover the first 40 km = 40 / 80 = 0.5 hours

Given the average speed of for next 40 km = 40km/h

Time taken to cover the next 40 km = Total Distance / average speed

Time taken to cover the next 40 km = 40 / 40 = 1 hours

Now the average speed of the tuck to cover total distance:

Average speed = Total distance / Total time

Average speed = (40 + 40) / (0.5 + 1)

Average speed = 53.33 km/h

8 0

2 years ago

A Styrofoam box has a surface area of 0.73 m and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and

Elis [28]

Answer:

$K = 0.076 W/m K$

Explanation:

Heat required to melt the complete ice is given as

$Q = mL$

here we have

m = 5.0 kg

$L = 3.35 \times 10^5 J/kg$

now we have

$Q = (5 kg)(3.35 \times 10^5)$

$Q = 1.67 \times 10^6 J$

now the power required to melt ice in 8.4 hours is

$P = \frac{Q}{t} = \frac{1.67\times 10^6}{8.4 \times 3600 s}$

$P = 55.4 Watt$

now by formula of conduction we know

$P = \frac{KA(\Delta T)}{x}$

now we have

$55.4 = \frac{K(0.73 m^2)(25 - 5)}{0.02}$

$K = 0.076 W/m K$

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3 years ago

In object is thrown off a cliff with a horizontal speak of 10 m/seconds. After three seconds the object hits the ground. Find th

marysya [2.9K]

the height of the cliff is 6feet and the horizontal

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3 years ago

You test a machine and find that it exerts a force of 5 N for each 2 N of force you exert operating the machine. What is the act

maw [93]

Answer:

The actual mechanical advantage is the mechanical advantage determined by physical measurement of the input and output forces.

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3 years ago