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lukranit [14]
3 years ago
7

Select the correct answer.

Physics
1 answer:
Kipish [7]3 years ago
4 0

Answer:

ОА.

The net force acting on the car from all directions is zero.

Explanation:

Constant speed along a straight line

It means constant magnitude of velocity without chainging direction

It means constant velocity. Which means acclecration is zero

By Newton's second law:

F=ma

Net force is also zero

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If mass of gold is 123.4g and its volume is 12.1cm cube, calculate its density
maxonik [38]

Answer:

10.198 g/cm³

Explanation:

ρ=m/V=123.4/12.1=10.198 g/cm³

3 0
3 years ago
Approximately what applied force is needed to keep the box moving with a constant velocity that is twice as fast as before? Expl
professor190 [17]

Complete question:

A force F is applied to the block as shown (check attached image). With an applied force of 1.5 N, the block moves with a constant velocity.

Approximately what applied force is needed to keep the box moving with a constant velocity that is twice as fast as before? Explain

Answer:

The applied force that is needed to keep the box moving with a constant velocity that is twice as fast as before, is 3 N

Force is directly proportional to velocity, to keep the box moving at the double of initial constant velocity, we must also double the value of the initially applied force.

Explanation:

Given;

magnitude of applied force, F = 1.5 N

Apply Newton's second law of motion;

F = ma

F = m(\frac{v}{t} )\\\\F = \frac{m}{t} v\\\\Let \ \frac{m}{t} \ be \ constant = k\\F = kv\\\\k = \frac{F}{v} \\\\\frac{F_1}{v_1} = \frac{F_2}{v_2}

The applied force needed to keep the box moving with a constant velocity that is twice as fast as before;

\frac{F_1}{v_1} = \frac{F_2}{v_2} \\\\(v_2 = 2v_1, \ and \ F_1 = 1.5N)\\\\\frac{1.5}{v_1} = \frac{F_2}{2v_1} \\\\1.5 = \frac{F_2}{2}\\\\F_2 = 2*1.5\\\\F_2 = 3 N

Therefore, the applied force that is needed to keep the box moving with a constant velocity that is twice as fast as before, is 3 N

Force is directly proportional to velocity, to keep the box moving at the double of initial constant velocity, we must also double the value of the applied force.

3 0
4 years ago
Why is it better to hold a musical events or programs in the evening?
Allushta [10]

Answer:

sound travels faster in the night

Explanation:

8 0
3 years ago
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On a graph of position vs. time, what do the x-values represent? What do the y-values represent?
jasenka [17]
 The <span>x-values equal time (usually in seconds according to physics position vs. time graphs) and the y-values equal distance (usually in meters according to physics position vs. time graphs). I hope the answer helps. Thank you for posting your question here. </span>
6 0
4 years ago
-
Paha777 [63]

Answer:

=140 cm²

Explanation:

1

____ ×20x 14

2

=1

___ x base × height

is the formula have a gr8 day :)

2

5 0
3 years ago
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