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Kamila [148]
3 years ago
12

A sailboat moves north for a distance of 10.00 km when blown by a wind 30° east of south with a force of 5.00 × 104 N. How much

work was done by the wind?
Physics
1 answer:
Snowcat [4.5K]3 years ago
8 0
2.50 × 108 J 4.33 × 108 J 5.00 × 108 J 0.00 J

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In the lab, you submerge 100 g of 40°C nails in 200 g of 20°C water. (The specific heat of iron is 0.12 cal/g # °C.) Equate the
Deffense [45]

Answer:

Final temperature of the mixture becomes

T = 21.13^oC

Explanation:

Here we know that heat given by the nail is equal to the heat absorbed by water

So here we know that heat to change the temperature is given as

Q = ms\Delta T

so by equating the heat we have

m_{iron}s_{iron}\Delta T = m_{water}s_{water}\Delta T

now we have

100 (0.12) (40 - T) = 200 (1) (T - 20)

4.8 - 0.12 T = 2T - 40

44.8 = 2.12 T

T = 21.13^oC

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2 years ago
What does a search engine do?
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Answer:

A search engine, allows the person to search upon the internet for content using 'keywords'.

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2 years ago
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Which best describes how air moves during convection?
torisob [31]

a. cool air warms as it mixes with denser air

Explanation:

c. warm air is displaced by cooler denser air

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8 0
3 years ago
36. The top floor of a building is 20 m above the basement. Show that the water pressure in the basement is nearly 200 kPa great
blagie [28]

Explanation:

pressure=density of water × gravity ×height

=1000×9.8×20=196,000N/m^2

=196000/1000=196kpa which is almost 200kpa

8 0
2 years ago
The fulcrum of a uniform 20-kg seesaw that is 4.0 m long is located 2.5 m from one end. A 30-kg child sits on the long end. Part
uranmaximum [27]

Answer:

57 kg

Explanation:

Mass of seesaw = 20 kg

Length of seesaw = 4 m

Mass of child on the longer end = 30 kg

The weight of the seesaw acts at the center i.e. 2m

The algebraic sum of moments of all forces about any point is zero, hence, using the fulcrum as the reference point:

[x * 9.8* 1.5] - [20 * 9.8* (2.5 - 2)] - [30 * 9.8 * 2.5] = 0

=> 14.7x = (20*9.8*0.5) + 735

14.7x = 98 + 735

14.7x = 833

=> x = 833/14.7

x = 57 kg

7 0
3 years ago
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