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3 years ago

Which was the first object made by humans to orbit earth?

1 answer:

6 0

The first human made object made to orbit earth was the Soviet Union's Sputnik 1, it launched the 4th of October 1957.

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What is the deceleration of the rocket sled if it comes to rest in 1.1 s from a speed of 1000 km/h? (such deceleration caused on

Wewaii [24]

The deceleration of the rocket sled if it comes to rest in 1.1 s from a speed of 1000 km/h is $252.52\ m/s^2$ .

The acceleration in opposite direction is known as the deceleration. Basically the deceleration is negative value of the acceleration since the negative sign depicts its opposite in direction.

The given data:

time, t = 1.1 s

initial speed, u = 1000 km/h = $\frac{2500}{9}\ m/s$

final speed, v = 0 m/s

So we will be using the equation of motion, that is,

v = u + at

$\therefore 0=\frac{2500}{9} + a(1.1)$

$\Rightarrow a=-\frac{2500}{9(1.1)}$

$\therefore a = - 252.52 \ m/s^2$

Hence , the deceleration of the rocket is $252.52\ m/s^2$ .

To learn more about Attention here:

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6 0

2 years ago

A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz

wariber [46]

Answer:

change in frequency is 636 Hz

Explanation:

given data

speed v1 = 36 m/s

speed v2 = 45 m/s

frequency f = 500 Hz

speed of sound s = 343 m/s

to find out

what is the change in frequency

solution

we know here change of frequency formula that is

frequency = $\frac{s+v1}{s+v2}$ (f) ...................1

put here value in equation 1

and we take v2 = -45 because opposite direction

frequency = $\frac{s+v1}{s-v2}$ (f)

frequency = $\frac{343+36}{343-45}$ (500)

frequency = 636

so change in frequency is 636 Hz

8 0

4 years ago

A person lifts a 6.50kg box off the ground a vertical distance of 1.25m and then carries it horizontally across the room by 4.75

victus00 [196]

What type of reaction is being shown in this energy diagram

6 0

3 years ago

In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and cra

san4es73 [151]

Answer:

Box 1 has more mass than box 2.

Explanation:

Box 1 has more mass than box 2, as it caused a greater affect in the change of speed of box 2. During a collision, the object with a lesser mass will be affected more, causing the velocity to change more. Because box one is greater than box 2, it caused a larger change in speed when they collided.

3 0

3 years ago

The figure above represents a stick of uniform density that is attached to a pivot at the right end and has equally spaced marks

zavuch27 [327]

Answer:

After 2.0s the angular momentum is $L= 2(4A+3B+2C+D)x$