4 years ago

A car is traveling 80 km/h if the car's speed remains constant how far will it have traveled in 3 hours

Physics

1 answer:

12345 [234]4 years ago

7 0

C. 80 because it is remaining conctant

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What is the minimum force required to increase the energy of a car by 84 J over a distance of 38 m? Assume the force is constant

konstantin123 [22]

Answer:

2.210N

Explanation:

Workdone = Force x distance

Distance = 38m , Workdone = 84J

Hence 84J = Force x 38m

Force = 84J / 38m

Force = 2.210N =2.2N

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3 years ago

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A coin of mass 0.05 kg is placed at a radius r= 0.1m meter on a horizontal turntable which is turning uniformly at a rate of one

Vsevolod [243]

Answer:F=0.0882kg

Explanation:

The period it takes to make one revolution is 1.5 seconds / revolutions,

v = r * (change in angle / change in time)

the change in angle is 2pi, for one whole revolution. the time is 1.5 second per revolution, and the radius is 0.1.

v = (2 * pi * 0.1 cm * / 1.5second

v = 0.42m/s

a=v^2/r

a=0.42^2 /0.1 =1.764m/s2

F=ma

F=0.05*1.764

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3 years ago

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Explanation:

the answer is a

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4 years ago

A large aquarium of height 6 m is filled with fresh water to a depth of D = 1.50 m. One wall of the aquarium consists of thick p

Vesnalui [34]

Answer

given,

height of aquarium = 6 m

Depth of fresh water = D = 1.50 m

horizontal length of the aquarium(w) = 8.40 m

total force increased when liquid is filled to depth = 4.30 m

g = 9.81 m/s²

ρ = 998 Kg/m³

force in the aquarium.

dF = PdA

$F = \int PdA$

$F = \int \rho\ g\ y\ (wdy)$

$F = \rho\ g\ w \int ydy$

$F = \rho\ g\ w\dfrac{y^2}{2}$

$F = \dfrac{\rho\ g\ w\ y^2}{2}$

At D = 1.5 m

$F = \dfrac{980\times 9.8\times 8.4\times 1.5^2}{2}$

F = 9.08 x 10⁴ N

At D = 4.30 m

$F = \dfrac{980\times 9.8\times 8.4\times 4.3^2}{2}$

F = 7.46 x 10⁵ N

Total force on the wall increased by

ΔF = 74.6 x 10⁴ - 9.08 x 10⁴

ΔF = 65.52 x 10⁴ N

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3 years ago