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4 years ago

ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.

Physics

2 answers:

arlik [135]4 years ago

5 0

3.8 x1017 is the correct answer

never [62]4 years ago

3 0

Answer:

3.8 x 10¹⁷ in

Explanation:

Light speed= 982,080,000 ft/s

year(time)= 32,000,000 seconds

converting ft/s to in/s for the speed of light:

1ft/s = 12 in/s

982,080,000 ft/s x 12in/s = 11,784,960,000 in/s ( speed of light in inches)

using the standard formula for speed:

V= $\frac{Distance}{Time}$

Distance( inches)= V (speed in/s) x Time (seconds)

Distance = 11,784,960,000 x 32,000,000

Distance≅ 3.8 x 10¹⁷ in

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if a certain car, going with speed v1, rounds a level curve with a radius r1, it is just on the verge of skidding. if its speed

schepotkina [342]

Answer:

The correct answer is 4R1

Explanation:

According to the given scenario ,the radius of the tightest curve on the same road without skidding is as follows:

As we know that

Centeripetal Acceleration is

= v^2 ÷ r

In the case when velocity becomes 2 times so the r would be 4 times

So, the radius of the tightest curve on the same road without skidding is 4R1

3 0

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.

5 0

3 years ago

A 750 kg car is moving at 20.0 m/s at a height of 5.0 m above the bottom of a hill when it runs out of gas. From there, the car

S_A_V [24]

Answer:

Explanation:

Kinetic energy at the height = 1/2 m v²

= 1/2 x 750 x 20²

= 150000 J

Its potential energy = mgh

= 750 x 9.8 x 5

=36750 J

Total energy = 186750 J

Its total kinetic energy will be equal to 186750 J , according to conservation of mechanical energy

If v be its velocity at the bottom

1/2 m v² = 186750

v = √498

= 22.31 m /s

5 0

3 years ago

A car has a mass of 850 kg. By pushing on the car, Evan increases its speed

Dmitry_Shevchenko [17]

Answer:

I=1,2•10³ kg•m/s

Explanation:

v¹=3.5m/s

vf=5m/s

v=5-3.5=1.5m/s

I=p

I=mv=850•1.5=1275 kg•m/s=1,2•10³ kg•m/s

8 0

4 years ago

Read 2 more answers

6. Two light bulbs are designed for use at 120 V and are rated at 75 W and 150 W. Which light bulb has the greater filament resi

Nonamiya [84]

$\\ \bull\tt\longrightarrow P=\dfrac{V^2}{R}$

P is power
R is resistance

$\\ \bull\tt\longrightarrow R=\dfrac{V^2}{P}$

Hence

$\\ \bull\tt\longrightarrow R\propto V$

$\\ \bull\tt\longrightarrow R\propto \dfrac{1}{P}$

Therefore if power is low then resistance will be high.

The first bulb has less power hence it has greater filament resistance.

5 0

3 years ago