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3 years ago

Help pls☹️☹️☹️☹️☹️ anyone

Physics

1 answer:

mario62 [17]3 years ago

7 0

2a) the first sound he hears was travelling through the metal pipe (sound travels faster in solids) while the second sound he hears traveled through the air.

2b) The pipe is 330m/s * 1s = 330m.

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What is the force on a 1670kg elevator accelerating at 6m/s square?

marshall27 [118]

As per Newton's 2nd law

we know that

$F = ma$

it is product of mass and acceleration

here we know that

$m = 1670 kg$

also we know that

$a = 6 m/s^2$

so from above equation we have

$F = 1670 * 6$

$F = 10020 N$

so the force here will be 10020 N

7 0

3 years ago

A hot-air balloon is rising straight up with a speed of 1.30 m/s. A ballast bag is released from rest relative to the balloon wh

DiKsa [7]

Answer:

The time before the ballast hits the ground is 1.186918s

Explanation:

We assume that the upward direction is positive.

The bag released from the ballon is at rest. The velocity of the bag equals the velocity of the balloon.

The balloon has a velocity (V0y) = 3m/s

When the bag is released, it has a height of 5.36m

To touch the ground it makes a displacement of y = - 5.36m

The motion of the bag can be described as followed:

y = V0t + 1/2 * at²

t² + (2V0/a)*t - (2y/a) = 0

We can solve this equation for t:

t= ((-2V0/a) ± √((2V0/a)² + 4*(2y/a))) /2

t = -(V0/a) ± √((V0/a)² + (2y/a))

In this equation we can plug the given values ( V0 = 1.3 m/s ; y = 5.36m ; g =-9.8 m/s²)

t = (1.3/-9.8)±√((1.3/-9.8)²+(2*(-5.36)/-9.8))

t = 0.132653 ± 1.054266

t= 1.186918

The time before the ballast hits the ground is 1.186918s

6 0

3 years ago

In an isolated system, the total amount of what is conserved? A) energy B) work C) sunlight D) matter E) force

Ganezh [65]

The correct answer would be D. In an isolated system, the total amount of matter is conserved. This is in agreement with the law of conservation of mass where mass cannot be created or destroyed, what goes inside the process should be the same amount as what goes out the process.

4 0

3 years ago

Read 2 more answers

a spacecraft covers the last straight stretch of an inter-galactic space race in 2.5 days. During that time, it uses its hyper-d

lutik1710 [3]

Answer:

$a=916\ km/h^2$

Explanation:

Given that,

Initial speed, u = 65,640 km/h

Final speed, v = 120,600 km/h

Time, t = 2.5 days = 60 h

We need to find the acceleration of the hyperdrive. We know that, acceleration is equal to the change in velocity per unit time. So,

$a=\dfrac{v-u}{t}\\\\a=\dfrac{120,600-65,640 }{60}\\\\=916\ km/h^2$

So, the acceleration of the hyperdrive is equal to $916\ km/h^2$ .

4 0

3 years ago

Pls halp!

pav-90 [236]

Answer:

Explanation:

Sound waves are due to vibrations of the medium through which it passes through. The vibrations of the medium would occur more easily through a gas like the atmosphere

8 0

2 years ago