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aev [14]
3 years ago
7

A sailor pulls a boat horizontally along a dock for 10.0 m with an angled rope. He does 766 J of work and has a force of 100.0 N

. What was the angle of the rope?
O 40°
Physics
1 answer:
Angelina_Jolie [31]3 years ago
8 0

Explanation:

W = Fd cos θ

766 J = (100.0 N) (10.0 m) cos θ

cos θ = 0.766

θ = 40.0°

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kobusy [5.1K]

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Explanation:

The proteins, lipids, and polysaccharides that make up most of the food we eat must be broken down into smaller molecules before our cells can use them—either as a source of energy or as building blocks for other molecules.

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If an automobile battery is rated at 20 ampere-hours, what is the maximum current that can be supplied for 19 minutes?
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3 years ago
The nucleus of some isotopes will spontaneously undergo nuclear decay. These isotopes are said to be radioactive. What causes th
Dmitry_Shevchenko [17]

Answer:

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The electric force and nuclear forces are in opposition to each other

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The electric force causes electrons to be released

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7 0
2 years ago
A speaker at the front of a room and an identical speaker at the rear of the room are being driven at 456 Hz by the same sound s
vampirchik [111]

Answer:

2.97795 Hz

Explanation:

v = Speed of sound in air = 343 m/s

v_r = Relative speed between the speakers and the student = 1.12 m/s

f' = Actual frequency of sound = 456 Hz

Frequency of sound heard as the student moves away from one speaker

f_1=f'\dfrac{v-v_r}{v}\\\Rightarrow f_1=456\dfrac{343-1.12}{343}\\\Rightarrow f_1=454.51102\ Hz

Frequency of sound heard as the student moves closer to the other speaker

f_2=f'\dfrac{v+v_r}{v}\\\Rightarrow f_2=456\dfrac{343+1.12}{343}\\\Rightarrow f_2=457.48897\ Hz

The difference in the frequencies is

f_2-f_1=457.48897-454.51102=2.97795\ Hz

The student hears 2.97795 Hz

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3 years ago
What's the equivalent unit and physical quantity of ampere.second
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Coulomb. c is the unit.
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