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3 years ago

Can air make shadows

Physics

1 answer:

MrRissso [65]3 years ago

5 0

Answer:no

Explanation:the way to see air is by steaming something sometimes you might not see the air but you can see the shadow

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A friend climbs an apple tree and drops a 0.22-kg apple from rest to you, standing 3.5 m below. When you catch the apple, you br

ella [17]

Answer: (A) velocity = 2.8m/s

(B) Average force = 1.9536 Newtons

Explanation:

Find detailed explanation in the attached picture

3 0

3 years ago

Explain the law of conversion of energy with an example and explain it

Sophie [7]

Answer:

The law of conservation of energy can be seen in these everyday examples of energy transference: Water can produce electricity. Water falls from the sky, converting potential energy to kinetic energy. ... The cue ball loses energy because the energy it had has been transferred to the 8 ball, so the cue ball slows down.

5 0

3 years ago

Read 2 more answers

The sixth harmonic of a 70 cm long guitar string has a frequency of 557.14 Hz. What is the velocity of sound in the guitar strin

Crazy boy [7]

Answer:

The velocity of sound in the guitar string = 129.99 m/s

Explanation:

Harmonics: A harmonic is a note with frequency equal to an integral multiple of that of the fundamental frequency.

Note: The harmonics of a string is the same as the harmonics of an open pipe.

f₆ = 3v/l ............................ Equation 1

making v the subject of the equation,

v = f₆l/3 ......................... Equation 2

Where f₆ = Is the sixth harmonics of the the string, v = velocity of sound in the guitar string, l = length of the guitar string.

Given: f₆ = 557.14 Hz, l = 70 cm = 0.7 m.

Substituting into equation 2

v = (557.14×0.7)/3

v = 129.99 m/s

Thus the velocity of sound in the guitar string = 129.99 m/s

7 0

3 years ago

An inductor, battery, resistance, and ammeter and switch are connected in series. If the switch, initially open, is now closed,

Tanzania [10]

The question is incomplete. Here is the complete question.

An inductor, battery, resistance and ammeter and switch are connected in series. If the switch, initially open, is now closed, what is the current's final value?

a. zero

b. Battery voltage divided by inductance

c. battery voltage times inductance

d. battery voltage divided by resistance

Answer: d. battery voltage divided by resistance

Explanation: Resistance, voltage and current are related by Ohm's Law, which is explained as the current that passes through a conductor is directly proportional to the applied voltage. The constant of proportionality between them is Resistance.

Ohm's Law is represented by $V=R.I$

Inductor is a component that stores magnetic energy when electricity is applied to it.

Ammeter is an object constructed to measure electric current of a circuit and it is always connected in serie.

So, in the circuit, when the switch is closed, the "only way" for current to pass through is because of Ohm's Law, which means its magnitude will be:

$I=\frac{V}{R}$

Then, the correct alternative is d. voltage divided by resistance.

7 0

3 years ago

The constant forces F1 = 8 + 29 + 32 N and F2 = 48 - 59 - 22 N act together on a particle during a displacement from the point A

marshall27 [118]

Answer:

-600 J

Explanation:

F₁ = 8i +29 j + 32k

F₂ = 48 i - 59 j - 22 k

F = F₁ +F₂ = 8i +29 j + 32k +48 i - 59 j - 22 k

F = 56i - 30 j + 10 k

displacement d = ( 0 - 20 )i + ( 0 - 15 )j + ( 7 -0) k

d = - 20 i - 15 j + 7 k

Work Done = F dot product d

F . d = - 56 x 20 - 30 x - 15 + 10 x 7

= - 1120 +450 + 70

= -600 J

5 0

3 years ago