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AleksAgata [21]
2 years ago
14

Select the correct answer

Physics
1 answer:
VMariaS [17]2 years ago
4 0

Answer:

Mary's average speed is 0.42 meters/second.

Explanation:

Mary's total travel was 250 meters and the elapsed time was 10 minutes, equivalent to 600 seconds.

d = displacement = 80 meters + 125 meters + 45 meters = 250 meters                  

t = time = 10 minutes . 60 seconds/minute = 600 seconds

We can obtain now the average speed:

s = average speed = displacement / time = 250 meters / 600 seconds ≅ 0.4167 ≅ 0.42

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-g A diving board 3.00 m long is supported at a point 1.00 m from the end, and a diver weighing 500 N stands at the free end (Fi
Vera_Pavlovna [14]

Answer:

Explanation:

Let the force at the support end is R and at the left end is F.

According to the equilibrium condition

F + R = 280 + 500

F + R = 780 .... (1)

Take moments about G.

F x 1.5 + R x 0.5 = 500 x 1.5

3F + R = 1500 .... (2)

Subtract equation (1) from equation (2), we get

2F = 1500 - 780

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4 0
3 years ago
A student has 67-cm-long arms. What is the minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle
choli [55]

Answer:

29.61 rpm.

Explanation:

Given,

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Now,

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\omega = \sqrt{\dfrac{g}{R}}

R = 67 + 35 = 102 cm = 1.02 m

\omega = \sqrt{\dfrac{9.81}{1.02}}

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\omega = \dfrac{3.101}{2\pi} = 0.494\ rev/s

\omega = 0.494 \times 60 = 29.61\ rpm

minimum angular velocity is equal to 29.61 rpm.

8 0
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