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3 years ago

Half Time At 3:00 the hour hand and the minute hand of a clock point in directions that are 90.0

Physics

1 answer:

jenyasd209 [6]3 years ago

5 0

Answer:

3 : 08 : 10.9

Explanation:

assuming a 12 hour clock

angular velocity of the hour hand is 2π/(3600(12)) rad/s

angular velocity of the minute hand is 2π/3600 rad/s

difference is 2π/3600 - 2π/(3600(12)) = 11(2π/(3600(12)) rad/s

45° = π/4 radians

This angle is covered in a time of

π/4 rad / 22π / (3600(12)) = 900(12) / 22 = 490.909090... s

or about 8 minutes 10.9 s

ANSWER 3:08:10.9

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It takes 150 minutes for a middle-aged physics professor to ride his bicycle up the road to Alpe d'Huez in France. The vertical

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Explanation:

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3 years ago

An ice cube can slide around the inside of a vertical circular hoop of radius . It undergoes small-amplitude oscillations if dis

klasskru [66]

Answer:

$T=2\pi \times \sqrt {\frac {g}{\mu R}$

Explanation:

$\mu mw^{2}R=mg$

where m is the mass, g is acceleration due to gravity

The masses m are on both sides hence they cancel

$W=\sqrt {\frac {g}{\mu R}$

We know that T=2\pi W and substituting W with the above equation then

$T=2\pi \times \sqrt {\frac {g}{\mu R}$

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4 years ago

Water flows through a garden hose which is attached to a nozzle. The water flows through hose with a speed of 1.81 m/s and throu

Serggg [28]

Answer:

a) 17.086m

b) 0.1671 m

Explanation:

Given data: speed of water through the hose = 1.81 m/s

through the nozzle = 18.3 m/s

We know that maximum height of an object with upward velocity v is given by,

a) H = v^2/2g

where H is the maximum height water emerges

= 18.3^2/(2×9.8) = 17.086 m answer

b) Again,

H = v^2/2g

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6 0

3 years ago

Study the image of the moving car.

gayaneshka [121]

Answer:

While traveling downhill, the car’s potential is <u>increasing</u> and kinetic energy is <u>decreasing</u>

Explanation:

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6 0

2 years ago

Read 2 more answers

Which involves more work in the scientific sense: moving the boxes and the furniture down from the second floor or up to the fif

Advocard [28]

Answer:

moving the boxes and the furniture up to the fifth floor.

Explanation:

The work done when moving an object up or down is equal to its change of gravitational potential energy:

$W=mg \Delta h$

where

m is the mass of the object

g is the gravitational acceleration

$\Delta h$ is the change in height of the object

We have two opposite situations:

1) when an object is moved upward, $\Delta h$ is positive, so the work done W is positive as well: this means that we need to do work in order to move the object, because we have to "win" the effect of gravity, which pulls the object downward

2) when an object is moved downward, $\Delta h$ is negative, so the work done W is negative as well: this means that we do not need to do work on the object, because it is already done by gravity, which pulls the object downward.

Therefore, more work is done when we are moving the boxes and the furniture up to the fifth floor.

8 0

3 years ago