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3 years ago

15

Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same dir

ection. What do you infer about the magnitudes and direction of the forces applied?

1 answer:

masya89 [10]3 years ago

3 0

They are pushing on opposite sides against each other. The cart is moving forwards

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The picture below shows four objects a paper clip, a pair of scissors, a needle and a horseshoe. assume that each object is made

Nataly_w [17]

Mass

Explanation:

They physical property that is not the same among the four objects is their masses.

Mass is the amount of matter contained in a substance.

Specific heat is the amount of energy needed to raise the temperature of 1g of a substance by 1k.
Since the materials are made of the same metal, they have the same specific heat.
They will also have the same magnetism and electrical conductivity.
These properties are intensive property and do not depend on the amount of matter present.
Mass is an extensive property that depends on the amount of matter present.

learn more:

Physical property brainly.com/question/5881840

#learnwithBrainly

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4 years ago

Se dispone de dos vasos con agua a 20 grados y queremos calentarlo hasta alcanzar 50 grados. Si el primero contiene 0,5l y el se

BigorU [14]

Answer:

The cup with 0.5L

Explanation:

To know what amount of water you take into account the specific heat of the water. The specific heat of water is:

$c_{water}=4186\frac{J}{kg\°C}$

Thus, 4186 J of energy are needed to icrease the temperature of 1 kg water in 1°C. Then, more grams of water will need more energy.

You have that one cup has 0.5 L and the other one has 750mL = 0.75L

The second cup of water will need more heat because the amount of water contained in the second cup is greater than in the first cup with 0.5L

4 0

3 years ago

What is the momentum of an 18-kg object moving at 0.5 m/s?

Otrada [13]

sorry Idk the answer ..???

6 0

3 years ago

A room that has an average ambient sound pressure level of 62 dBA and a maximum sound pressure level lasting more than a minute

cupoosta [38]

Answer:

Explanation:

A fire alarm notification appliance is an active fire protection component of a fire alarm system. The primary function of the notification appliance is to alert persons at risk.

If want the audible public mode signal to be hear clearly then, we need to have a sound level that is at least 15dB above the average ambient sound level or 5dB above the maximum sound level of at least 1minute

In this case the,

The average ambient sound level is 62dB,

And the maximum sound level is 68dB

Then, the public mode signal should be at least

1. 62dB+ 15dB=77dB

Or

2. 68dB +5dB =73dB.

Then the public mode signal hearing must be at least 77dB.

6 0

4 years ago

In which of these samples do the molecules most likely have the most kinetic energy? (2 points)

Vinvika [58]

D, water vapor. Gaseous state would have more kinetic energy, they are moving faster. If you have to compare the same state, then higher temperature would have the higher kinetic energy. But if you have solid and liquid at the same temperature - then liquid would have more.

4 0

3 years ago