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Virty [35]
2 years ago
9

A 6000 kg rocket is launched vertically from the ground. If the exhaust speed is 1000 m/s, how much gas must be ejected each sec

ond if the thrust is to equal the magnitude of the gravitational force on the rocket
Physics
1 answer:
MrMuchimi2 years ago
3 0

Answer: 60kg/sec

Explanation:

From the question, the mass is given as:

Mass, m = 6000kg

The formula for thrust us calculated as:

F = u × dt/dm

We then equate thrust = weight. This will be:

1000 × dt/dm =mg

1000 × dt/dm = 6000 × 10

1000 × dt/dm = 60000

dt/dm = 60,000/1,000

dt/dm = 60kg

Therefore, the gas ejected per second will be 60 kg/s

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andre [41]
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3 years ago
A 40 kg person sits on top of a 400 kg rock. What is the person’s weight? 390 N
algol13

The weight of the person is given by:

W = mg

W = weight, m = mass, g = gravitational acceleration

Given values:

m = 40kg, g = 9.81m/s²

Plug in and solve for W:

W = 40(9.81)

W = 390N

7 0
3 years ago
The momentum of an object is determined to be 7.2 x 10-3 cm kg x m/s. Express this as provided or use any equivalent unit. How i
Leno4ka [110]

Complete Question:

The momentum of an object is determined to be 7.2 × 10-3 kg⋅m/s. Express this quantity as provided or use any equivalent unit. (Note: 1 kg = 1000 g).

Answer:

7.2 gm/s.

Explanation:

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

Momentum = mass * velocity

Given the following data;

Momentum = 7.2 * 10^-3 kgm/s

1 kg = 1000 g

Substituting the unit in kilograms with grams, we have;

Momentum = 7.2 * 10^-3 * 1000 gm/s

<em>Momentum = 7.2 gm/s. </em>

7 0
3 years ago
Describe a situation in which an object's speed is constant but its velocity is changing.
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1) If the object changes directions with the same speed, it will be changing its velocity, because velocity is a vector, which depends on both magnitude and direction. Speed is just magnitude regardless of direction.

2) Rotational motion. 
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Answer:

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