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3 years ago

9

a boy throws a small stone into a pond. waves spread out from where the stone hits the water and travel to the side of the pond.

the boy notices that eight waves reach the side of the pond in a time of 5.0 s. what is the frequency of the waves

1 answer:

stich3 [128]3 years ago

4 0

Answer: 1.6Hz

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what is the total distance traveled by a bike rider who rides for three hours at 40 km/hr and then two more hours at 50 km/hr?

marta [7]

Answer:

220 km

Explanation:

3 hours at 40 km/hr

40 km = 1 hour

40 km times 3 = 120 km

2 hours at 50 km/hr

50 km = 1 hour

50 times 2 = 100 km

Total distance

120 km + 100 km = 220 km

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If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this o

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4 years ago

A crane does 62,500 joules of work to lift a boulder a distance of 25.0 meters. How much did the boulder weight

alukav5142 [94]

Work = (force) x (distance)

62,500 joules = (boulder's weight) x (25 meters)

Divide each side by (25 meters) :

Boulder's weight = (62,500 joules) / (25 meters) = <u>2,500 newtons</u>

That's about 562 pounds.

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3 years ago

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Troyanec [42]

Where everything is effected by a force

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After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 55.0 cmcm. She finds that the pen

Art [367]

Hi there!

First, let's find the period of the pendulum. This can be found by solving for the amount of time it takes for the pendulum to make ONE complete swing.

$T = \frac{\text{Total time}}{\text{Number of complete swings} }\\\\T = \frac{145}{110} = 1.318 s$

Now, let's use the equation for the period of a simple pendulum:
$T = 2\pi \sqrt{\frac{L}{g}}$

T = Period (1.318 s)
L = length of string (0.55 m)

g = acceleration due to gravity on planet (? m/s²)

Let's solve for 'g' doing some quick rearranging of the equation:
$T^2 = 4 \pi^2 (\frac{L}{g})\\\\g = \frac{4\pi^2 L}{T^2}\\\\$

Solving for 'g' by plugging in values:
$g = \frac{4\pi^2 (0.55)}{(1.318)^2}\\ \\= \boxed{12.496 \frac{m}{s^2}}$

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2 years ago