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3 years ago

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Two masses exert a force of 1,161 N on each other when they are 20 km apart. How much force will these two masses exert on each

other when they are 40 km apart?

1 answer:

Slav-nsk [51]3 years ago

3 0

Explanation:

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A worker drops a wrench from the top of a tower 80m tall. What is the velocity when the

OlgaM077 [116]

Answer:

39.6 m/s

Explanation:

Taking down to be positive:

Given:

v₀ = 0 m/s

a = 9.8 m/s²

Δy = 80 m

Find: v

v² = v₀² + 2aΔy

v² = (0 m/s)² + 2 (9.8 m/s²) (80 m)

v = 39.6 m/s

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A student uses a spring loaded launcher to launch a marble vertically in the air. The mass of the marble is

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Answer:

Part a)

When spring compressed by 2 cm

H = 1.47 m

Part b)

When spring is compressed by 4 cm

H = 5.94 m

Explanation:

Part a)

As we know that the spring is compressed and released

so here spring potential energy is converted into gravitational potential energy at its maximum height

So we will have

$\frac{1}{2}kx^2 = mg(H + x)$

$0.5(220)(0.02)^2 = 0.003(9.81)(H + 0.02)$

so we have

$H = 1.47 m$

Part b)

Similarly when spring is compressed by 4 cm

then we have

$\frac{1}{2}kx^2 = mg(H + x)$

$0.5(220)(0.04)^2 = 0.003(9.81)(H + 0.04)$

so we have

$H = 5.94 m$

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Answer:

700 hz

Explanation:

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Decrease temperature

Decrease concentration

Explanation:

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4 years ago