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2 years ago

The velocity of a 10.0 kg object that has 720 J of kinetic energy is m/s. (Report the answer to two significant figures.)

Physics

2 answers:

RideAnS [48]2 years ago

7 0

the answer is 12 m/s

nikdorinn [45]2 years ago

4 0

Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. It is expressed as:

KE = mv^2 /2

720 = 10.0v^2 /2
v = 12 m/s

Hope this answers the question. Have a nice day.

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the acceleration due to gravity on the moon is 1.6 m/s^2 what is the gravitational potential energy of a 1200 kg lander resting

Mumz [18]

Answer

672,000 Joules

Explanation

Gravitational potential energy (P.E) is the energy possessed by a body that is at a potential height from the ground.

IT is calculated by the formula;

P.E = mgh

Where m ⇒ mass

g ⇒ acceleration due to gravity

h ⇒ height from trhe ground.

P.E = 1200 × 1.6 × 350

= 672,000 Joules.

5 0

2 years ago

The earth's magnetic field, with a magnetic dipole moment of 8.0×1022Am2, is generated by currents within the molten iron of the

Fed [463]

To solve this problem it is necessary to apply the concepts related to the magnetic dipole moment in terms of the current and the surface area, as well as the current density, as a function of the current over the area.

Part A) By definition we know that magnetic dipole moment is

$m = IS$

Where,

I = Current

S = Area

$m = IA \rightarrow m= I( \pi r^2)$

Replacing with our values we have that,

$8*10^{22} = I \pi(\frac{3000*10^3}{2})^2$

Re-arrange to find I,

$I = 1.1317*10^{10} A$

Part B) To find the Current density we need to find the cross sectional area of the Wire:

$A = \pi r^2 \\A = \pi (\frac{1000*10^3}{2})^2\\A = 7.854*10^{11}m^2$

Finally the current density is simply J

$J = \frac{I}{A}\\J = \frac{1.1317*10^{10}}{7.854*10^{11}}\\J = 0.0144A/m^2$

PART C) Finally to make the comparison with the given values we have to cross-sectional area would be

$A = \pi (10-3)^2 \\A = 49\pi$

Therefore the current density would be

$J = \frac{I}{A}\\J = \frac{30A}{49\pi}\\J = 9.549*10^5 A/m^2$

Comparing the two values we can see that the 2mm wire has a higher current density.

4 0

2 years ago

Write difference between upstroke and downstroke of water pump

lakkis [162]

Explanation:

Upstroke is a mechanism which helps to raise the plunger and downstroke helps to help lower the plunger. On the up-stroke of the plunger, the lower valve opens and the upper valve is closed. ... Whereas, on the downstroke, the lower valve closes and the upper one opens.

7 0

2 years ago

Calculate the density of mercury if 500 cm3

notka56 [123]

Answer:

The density of the mercury is 13.2 g/cm³

Explanation:

Density is a measurement that compares the amount of matter an object

has to its volume

Density is equal to mass divided by volume

We need to find the density of mercury if 500 cm³ has a mass of

6.60 kg in g/cm