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katrin2010 [14]

3 years ago

6

The waves used by a microwave oven to cook food have a frequency of 2.45 gigahertz calculate the wavelength of this type of wave

'

1 answer:

fenix001 [56]3 years ago

4 0

Electromagnetic wave bc I studied that early in the year

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Alex places 2 cubes side-by-side on a ramp made of wood. Cube #1 is ice and Cube #2 is wood

zmey [24]

Answer:

Explanation:

The sandpaper block did not move because the forces of friction and gravity were balanced.

6 0

3 years ago

What causes wind how does the process reverse itself between day and night?

iris [78.8K]

<span>Wind is nature's way of balancing the temperature between hot and cold. Wind always flows from heat to cool. When night falls, the air cools. And since it gets cooler at night it reverses.</span>

5 0

3 years ago

"I could feel his anguish" what could be the anguish

sergey [27]

Answer:

yeah

Explanation:

the answer is right.

3 0

3 years ago

An archer shoots a 150. gram arrow straight up in the air. (Do not try this at home.) The bow was drawn back 75.0 cm by a 175 N

Dmitry [639]

Answer:

The arrow rise 44.64 m high assuming air friction is negligible

Explanation:

According to the law of conservation of energy

Kinetic energy = Potential energy at highest

$\frac{1}{2}kx^2=mgh$ ----1

We know that F=kx

So, $k = \frac{F}{x}\\k=\frac{175}{0.75}$

Substitute the value in 1

$\frac{1}{2}(\frac{175}{0.75})(0.75)^2=0.15 \times 9.8 \times h\\\frac{\frac{1}{2}(\frac{175}{0.75})(0.75)^2}{0.15 \times 9.8}=h\\44.64 = h$

Hence the arrow rise 44.64 m high assuming air friction is negligible

4 0

3 years ago

20. Which statement is false? Rewrite it so that it is true. a. Fusion involves the combination of two smaller atoms into a larg

Annette [7]

Answer:

c. Fission and fusion are two processes that release very little amounts of energy.

Explanation:

This statement is false. In fact, both fission and fusion are processes which release very large amounts of energy. The statement can be rewritten as it is true as follows:

"Fission and fusion are two processes that release very large amounts of energy."

Fission occurs when a large nucleus break apart, splitting into smaller nuclei, while fusion occurs when two light nuclei combine together into a larger nucleus. In both cases, the mass of the reactants is larger than the mass of the final products, so some of the mass has been converted into energy, according to Einstein's equation:

$E = \Delta m c^2$

where

E is the energy released

$\Delta m$ is the mass lost in the process

c is the speed of light

Since c is a very large number ( $c=3\cdot 10^8 m/s$ ), we see that even a very small mass $\Delta m$ causes the released of a huge amount of energy, so both fission and fusion release large amounts of energy.

3 0

3 years ago