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Nesterboy [21]
3 years ago
5

HELP !!!!!! An object moving forward at 10 m/s suddenly begins moving backward at 5 m/s. What is the most accurate explanation f

or this change?
The object was traveling in a straight line until it hit a brick wall and bounced backward.



The force pushing back on the object became greater than the force pushing the object forward.



The forces acting on the object were equal at first. Then the forces became unequal, causing the object to change its direction.



The forces were balanced in the forward direction. Then they became balanced in the backward direction.
Chemistry
1 answer:
Nana76 [90]3 years ago
8 0
It moves backwards 5m/s slower that forward
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A 25 gram(m) metal ball is heated to 200C(delta T) with 2330 Joules(q) of energy. What is the specific heat of the metal?
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Answer:

The specific heat of the metal is 0.466 \frac{J}{g*C}

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

The equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

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Replacing:

2330 J= c*25 g* 200 °C

Solving:

c=\frac{2330 J}{25 g* 200 C}

c=0.466 \frac{J}{g*C}

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Finally, multiply your answer by 100

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Round to three significant figures, and you're done.

=1.78 % error



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