Two descriptions about physical quantities are given below:

Physics

1 answer:

Semenov [28]3 years ago

5 0

Answer:

quantity A is mass and quantity B is wright

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Which statement best describes the forces in this picture

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Explanation:

Force is strength and energy as an attribute of physical action or movement.

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A hand-held video game is powered by batteries. After playing the game for several minutes, a student notices that the game feel

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A 13,000 kg helicopter accelerates upward a 0.5 m/s^2 while lifting a 2000 pound car. to the nearest newton, what is the lift fo

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Lift force exerted by the air on the rotors=143244 N

Explanation:

we use Newtons second law

F- (M+m)g=(M+m)a

F= lift force

m= mass of helicopter= 13000 Kg

M= mass of car= 2000 lb=907.2 kg

a= acceleration= 0.5 m/s²

g= acceleration due to gravity

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F=(M+m)(a+g)

F=(13000+907.2)(0.5+9.8)

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If a builder of mass 75kg climbs a vertical ladder of 25m how much energy has she gained ?

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So,

GPE (graviational potential energy) = mass x g x height

GPE is depends on where zero height is defined. In this situation, we define h = 0 as the initial height.

$GPE = 75 \ kg*9.8 \ \frac{m}{s^2}*25 \ m$

$GPE = 18,375 \frac{kg*m^2}{s^2}$

$GPE = 18,375 \ joules(J) \ or \ 18.375 \ kilojoules(kJ)$

The builder has gained 18.375 kJ of PE.

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