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3 years ago

A 2kg object is dropped from height of 10m. ignoring air resistance calculate:

Physics

1 answer:

lbvjy [14]3 years ago

5 0

Answer:

ME= 196.2 J

KE= 136.2

Explanation:

potential energy=mgh 2*9.81*10

Our ME is quivalent to PE as that is the toal amount of energy in the system

Kinetic energy= 1/2 m $v^{2}$

to solve for kinetic enrgy we need to use a kinaetmtic equation that help us find velocity

vf= vi+at

but we need to find time first

d=vi+1/2(accelretaion) $t^{2}$

7=0+1/2(9.81) $t^{2}$

t= 1.19 s

vf= 0+ 9.81*1.19

vf= 11.67 m/s

Now

1/2 m $v^{2}$

1/2*2* $11.67^{2}$

= 136. 2

or we could just (PE/10)*7

so (196.2/10)*7

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3 years ago

Nora's hair dryer is 64% efficient. If 1000 J of energy is supplied to the hair dryer, how much energy will it transfer usefully

lakkis [162]

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Data

Efficiency = 64%

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2 years ago

A container is filled with liquid the depth of the liquid is 60 CM if exertingc in pressure is 2000pa. calculator the density of

riadik2000 [5.3K]

Answer:

The density of the liquid is 340.136 kg/m³

Explanation:

Given;

depth of liquid in the container, h = 60 cm = 0.6 m

pressure of the liquid, P = 2000 Pa = 2000 N/m²

The pressure of the liquid is calculated as ;

P = ρgh

where;

ρ is density of the liquid

g is acceleration due to gravity = 9.8 m/s²

h is depth of the liquid

Make the density (ρ) the subject of the formula;

$\rho = \frac{P}{gh} \\\\\rho = \frac{2000}{9.8 \times 0.6}\\\\\rho = 340.136 \ kg/m^3$

Therefore, the density of the liquid is 340.136 kg/m³

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3 years ago