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3 years ago

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A child does 350J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 5.2 m above th

e ground. What is the mass of the box? A) 4.1 kg B) 6.9 kg C) 6.2 kg D) 5.2 kg

1 answer:

Advocard [28]3 years ago

3 0

I think the answer to that questions is B.

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A box has sides of 10 cm, 8.2 cm, and 3.5 cm. What is its volume?

Ksju [112]

The volume would be 287cm³. Multiply all the 3 numbers by each other

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3 years ago

The average speed of a greyhound bus from lansing to detroit is 104.5 km/h. on the return trip from detroit to lansing the avera

Nitella [24]

The average speed of the bus from Lansing to Detroit is
$v_1 = 104.5 km/h$
while the average speed of the bus from Detroit to Lansing is
$v_2 =56.2 km/h$

The distance covered by the bus in the two trips is the same (the distance between the two cities), therefore, the average speed of the round trip can be calculated as the mean of the two speeds:
$v= \frac{v_1+v_2}{2}= \frac{104.5+56.2}{2}=80.35 km/h$

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3 years ago

Write one example of a physical change and one example chemical change

mojhsa [17]

Physical change = changes the physical properties (more commonly known as it's look)
Chemical change = changes the chemical properties into an entire new chemical form
Examples of physical change would be melting ice cubes or sugar cubes.
Examples of chemical change would be cooking eggs or burning paper because you're changing its chemical properties.

6 0

3 years ago

When two substances are mixed together, a color change is observed. Does this mean that a chemical reaction has definitely occur

Elanso [62]

Nope, color change can also occur during a physical change.

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3 years ago

If 3,600 J of work is done in 3.0 s, what is the power?

Firlakuza [10]

Answer:

1,200 watts

Explanation:

1 watt = 1 Joule (J) of work / second

So, 3600 Joules of work / 3 seconds is:

3600 J / 3 seconds = 1,200 watts

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3 years ago