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3 years ago

Which phrase describes a scientific law?

Physics

2 answers:

Y_Kistochka [10]3 years ago

8 0

Answer: A. A statement that matter cannot be created or destroyed.

Explanation:

Apex

blagie [28]3 years ago

3 0

Answer:

C- An explanation for why matter cannot be created or destroyed

Explanation:

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a girl performed 50j of work lifting a heavy box it took her 5 seconds to lift the box what is her power

son4ous [18]

Answer:

10 W

Explanation:

Power is work over time.

P = W / t

P = 50 J / 5 s

P = 10 W

3 0

3 years ago

How far should the second antenna be moved in order to receive a minimum signal from a station that broadcasts at 99.4 MHz?

raketka [301]

Answer:

So the distance of the antenna from the station will be 3.018 m

Explanation:

We have given the frequency of the broadcast $f=99.4MHz=99.4\times 10^4Hz$

The speed of light $c=3\times 10^8m/sec$

The distance of the antenna to receive a minimum signal from the station is given by $d=\frac{v}{f}=\frac{3\times 10^{8}}{99.4\times 10^6}=3.018m$

So the distance of the antenna from the station will be 3.018 m

5 0

4 years ago

Help me out please!!!

Oxana [17]

Answer:

39 square feet

Explanation:

The formula for figuring out the area of a triangle is base x height x 0.5 therefore each triangles area is 7.5 square feet x 4 which is 30 and the base of the pyramids area is equal to 9 square feet. 30 plus 9 equals 39 square feet.

4 0

4 years ago

What is the relationship between work and power?

borishaifa [10]

Answer:

Power is the amount of work done in a unit of time.

Explanation:

Work done is the amount of energy transferred when an applied force moves an object through a displacement <em>s</em>.

Power is the amount of work done per unit time.

$Power=\frac{\text{Work Done}}{\text{time taken}}$

Power is measured in units Joules per second.

3 0

3 years ago

According to the law of conservation of energy, when a lawnmower uses 750 J of chemical energy from gasoline, how much of this e

steposvetlana [31]

Energy is neither created nor destroyed

E in = E out
750 J in so 750 J out

6 0

3 years ago

Read 2 more answers