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3 years ago

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Which statement is true? A Displacement can never be greater than distance. B Displacement can never be less than distance. C Di

splacement can never be equal to distance. D Displacement is always equal to distance.

1 answer:

qwelly [4]3 years ago

3 0

Answer:

__________________

I think the answer is A.

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An earthquake emits both S-waves and P-waves which travel at different speeds through the Earth. A P-wave travels at 9 000 m/s a

Cerrena [4.2K]

Assuming constant speeds, the P-wave covers a distance <em>d</em> in time <em>t</em> such that

9000 m/s = <em>d</em>/(60 <em>t</em>)

while the S-wave covers the same distance after 1 more minute so that

5000 m/s = <em>d</em>/(60(<em>t</em> + 1))

Now,

<em>d</em> = 540,000 <em>t</em>

<em>d</em> = 300,000(<em>t</em> + 1) = 300,000 <em>t</em> + 300,000

Solve for <em>t</em> in the first equation and substitute it into the second equation, then solve for <em>d</em> :

<em>t</em> = <em>d</em>/540,000

<em>d</em> = 300,000/540,000 <em>d</em> + 300,000

4/9 <em>d</em> = 300,000

<em>d</em> = 675,000

So the earthquake center is 675,000 m away from the seismic station.

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3 years ago

You’ve set up a frictionless car racetrack, with a loop of radius 0.5 m. Your toy car of mass 2 kg starts at rest at the top of

Anna007 [38]

Answer

h = 1.12 m

Explanation:

given,

mass of the car = 2 kg

radius = 0.5 m

let h be the height of the ramp

when the car reaches at the top point

gravity = centripetal force

$mg =\dfrac{mv^2}{r}$

$g =\dfrac{v^2}{r}$

$v = \sqrt{gr}$

using conservation of energy

$\PE_i = PE_f + KE_f$

$m g h = m g (2r)+\dfrac{1}{2}mv^2$

$g h =g (2r)+\dfrac{1}{2}(\sqrt{gr})^2$

$g h =2 gr +\dfrac{gr}{2}$

$h =\dfrac{5r}{2}$

$h =\dfrac{5\times 0.5}{2}$

h = 1.12 m

hence, height of the ramp should be greater than 1.12 m so that it can complete the loop.

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3 years ago

A lightbulb has an efficiency of 13.1%.How much light energy (not heat energy) is generated by the bulb every second if the bulb

maw [93]

Answer:

1.048 W

Explanation: Given that a lightbulb has an efficiency of 13.1%.How much light energy (not heat energy) is generated by the bulb every second if the bulb has a power pf 8W?

The input power = 8W

The output power = ?

The efficiency = 13.1%

Using the formula below:

Efficiency = (power output / power input) × 100

13.1 = (Power output / 8 ) × 100

0.131 = power output / 8

Cross multiply to make the power output the subject of formula

Power output = 0.131 × 8

Power output = 1.048 W

Therefore, the light energy (not heat energy) generated by the bulb every second is 1.048 W

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2 years ago

A baseball is thrown a distance of 17.2 m What is its speed if it takes 0.56 seconds to cover the distance?

lubasha [3.4K]

Answer:

v = (S2 - S1) / t = 17.2 m / .56 s = 30.7 m/s

This is about 100 ft/sec or 69 mph

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2 years ago

What is the formula for calculating density?

Sophie [7]

<span>Density can be determined by the mass of an object and how much it takes up space (volume). It is represented by the formula D = M/V where D is the density in kg/m^3 or lb/ft^3, M is the mass in kg or lb and V is the volume in m^3 or ft^3. The answer would be A. For example, you are given the mass of an object of 40.5kg and a volume of 15m^3. Find its density.</span>

D = M/V
D = (40.5 kg) / (15 m^3)
<span>D = 27/10 or 2.7 kg/m^3 </span>

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3 years ago

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