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3 years ago

15

20 pts. What type of forces do not change the motion of an object? Acceleration forces Balanced forces Inertia forces Unbalanced

forces

1 answer:

Sergeu [11.5K]3 years ago

5 0

Answer:

Balanced forces

Explanation:

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The table shows the specific heat capacities of various substances. How much energy is required to raise the temperature of 5g o

EastWind [94]

Answer:

50.25 j

Explanation:

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3 years ago

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The following time dependent force is applied to a 2 kg block that is initially at rest on a frictionless and horizontal surface

DerKrebs [107]

Answer:

The displacement of the block is 9 m.

Explanation:

Given that,

Mass of block = 2 kg

Time = 3 sec

The force is

$F(t)=4t$

The acceleration is

$a=\dfrac{F}{m}$

Put the value into the formula

$a=\dfrac{4t}{2}$

$a=2t$

We need to calculate the velocity

Using formula of acceleration

$v=\int_{0}^{t}{a dt}$

Put the value into the formula

$v=\int_{0}^{3}(2t dt)$

$v=(\dfrac{2t^2}{2})_{0}^{3}$

$v=(t^2)_{0}^{3}$

$v=9\ m/s$

We need to calculate the displacement

Using formula of velocity

$s=\int_{0}^{3}(v dt)$

$s=(t^2)_{0}^{3}$

$s=(\dfrac{t^3}{3})_{0}^{3}$

$s=9\ m/s$

Hence, The displacement of the block is 9 m.

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3 years ago

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A 1200-kg car initially at rest undergoes constant acceleration for 9.4 s, reaching a speed of 11 m/s. It then collides with a s

Natalka [10]

To solve this problem we will apply the principle of conservation of energy and the definition of kinematic energy as half the product between mass and squared velocity. So,

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$KE_f = \frac{1}{2} mv^2$

Here,

m = Mass

V = Velocity

Replacing,

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$KE_f = 72600J$

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4 years ago

What state of matter does sound travel the fastest?

antoniya [11.8K]

Sound travels fastest through matter in the <em>solid state</em>.

I know this from having answered a huge number of Brainly questions that required me to look up things like this:

-- Speed of sound in air . . . about 340 m/s

-- Speed of sound in sea-water . . . about 1,500 m/s

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4 years ago

Classify the following situations as involving balanced or unbalanced forces.

tester [92]

Answer:

1) Unbalanced

2) Balance

3) Balanced

4) Unbalanced

5) Unbalanced

Explanation:

For 1 and 5, since the objects are not at a constant speed/velocity, their forces must be unbalanced.

For 2 and 3, their speeds are constant so that means the force is balanced. If the bycicle or box started accelerating, that would indicate an unbalanced force

For 4, the speed is constant, but it's direction is not indicating another unbalanced outside force causing it to turn. The force is unbalanced.

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3 years ago