4 years ago

A balance is best used to measure a sample’s

Physics

1 answer:

blondinia [14]4 years ago

7 0

The answer is “ Mass “

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A radio wave sent from the surface of the earth reflects from the surface of the moon and returns to the earth. The elapsed time

frez [133]

Answer:

7.92 × 10^8 M

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4 years ago

The mathematical relationship between current, voltage and resistance is known as

stiks02 [169]

Answer:

Ohm's Law

Explanation:

The relationship: $V=R*I$

where V represents the voltage across a resistor of resistance "R" through which a current (I) flows,

is known as Ohm's Law in honor of Georg Ohm, who discover this proportionality.

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3 years ago

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A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm.

Anna35 [415]

the wavelength equation is

speed (of light in this case)= wavelength (m) x frequency

3x10^8m/s / .07m = f

frequency= 4 285 714 286 hertz

b) Total distance= 4.8 km (4,800 m)

Speed = 3x10^8 m/s

d=st

t= d/s

t= 4,800 m/3x10^8m/s

<span>t= 1x10^-5 seconds</span>

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3 years ago

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A box of groceries requires 5.0 newtons of force to lift it up 1.0 meter. How much work is done?

tigry1 [53]

Work is defined as the amount of force done multiplied by the distance it was applied. Since it is already given that the object of interest (a box of groceries) was lifted up 1 meter by a force of 5 newtons, work done can be solved using the following formula:

Work = Force * distance
Work = 5 N * 1 meter
Work = 5 N*m = 5 J

8 0

4 years ago

How much energy is needed to change the speed of a 1600 kg sport utility vehicle from 15.0 m/s to 40.0 m/s?

podryga [215]

Answer:

Energy needed = 1100 kJ

Explanation:

Energy needed = Change in kinetic energy

Initial velocity = 15 m/s

Mass, m = 1600 kg

$\texttt{Initial kinetic energy = }\frac{1}{2}mv^2=0.5\times 1600\times 15^2=180000J$

Final velocity = 40 m/s

$\texttt{Final kinetic energy = }\frac{1}{2}mv^2=0.5\times 1600\times 40^2=1280000J$

Energy needed = Change in kinetic energy = 1280000-180000 = 1100000J

Energy needed = 1100 kJ

4 0

3 years ago