3 years ago

2.List two changes an unbalanced force can cause.

1 answer:

3 0

Answer:

By applying an unbalanced force, you can change the motion of an object. Unbalanced forces can make an object at rest start moving, make a moving object stop, or change the direction and speed of the object.

Explanation:

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A 4.0 kg bird has 8.0 joules of kinetic energy how fast is it flying

poizon [28]

Answer

The velocity of the bird is 2 m /sec .

Explanation:

The formula for kinetic energy is given by.

$Kinetic\ energy = \frac{1}{2}\ m\ v^{2}$

Where m is mass , v is the velocity .

As given

A 4.0 kg bird has 8.0 joules of kinetic energy .

m = 4.0 kg

K.E = 8.0 joules

Putting in the formula

$8.0 = \frac{1}{2}\times 4.0\times v^{2}$

$v^{2}= \frac{8.0\times 2}{4.0}$

$v^{2}= 2\times 2$

$v^{2}= 4$

$\sqrt{4} = 2$

Thus

v = 2 m/sec

Therefore the velocity of the bird is 2 m /sec .

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3 years ago

The AM radio station WDRJ broadcasts news and sports at a frequency of 704 kHz (kilohertz). What is the wavelength of the radio

Doss [256]

Answer:

AM broadcasts occur on North American airwaves in the medium wave frequency range of 525 to 1705 kHz (known as the “standard broadcast band”). The band was expanded in the 1990s by adding nine channels from 1605 to 1705 kHz.

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3 years ago

Each large pizza can feed three teenage boys. How many pizzas would be needed to feed the

Blababa [14]

Answer:

19 pizzas

Explanation:

1 pizza = 3 boys

=> 56 ÷ 3 = 18.666666666666.. or about 19 pizzas

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3 years ago

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